CN116783380B - Low-emission nozzle, low-emission dual-fuel combustion chamber and gas turbine generator set - Google Patents

Abstract

This invention relates to a low-emission nozzle, a low-emission dual-fuel combustion chamber, and a gas turbine generator set. The invention addresses the problem of high-temperature carbon buildup in existing technologies. It integrates a dual-fuel low-emission nozzle design, combining liquid fuel diffusion combustion and gaseous fuel premixed combustion. When the gas turbine uses gaseous fuel, the gaseous fuel is injected through small orifices on the low-emission nozzle's cyclone separator for good mixing with air, reducing pollutant emissions through premixed combustion. When the gas turbine uses liquid fuel, the air-assisted atomization nozzle at the center of the low-emission nozzle solves the problem of poor liquid fuel atomization at low operating conditions. Furthermore, a low-emission dual-fuel control system is proposed to supply either gaseous or liquid fuel to the gas turbine, regulate fuel supply, and achieve smooth online switching between gas and liquid fuels without shutting down the turbine. This invention is used for power generation.

Description

Low-emission nozzle, low-emission dual-fuel combustion chamber and gas turbine generator set

Technical Field

The invention relates to a low-emission nozzle, a low-emission dual-fuel combustion chamber and a fuel control system of a gas turbine generator set. Belongs to the field of heat energy and power engineering.

Background

With the continuous promotion of the ocean strategy in China, the exploration and exploitation force of the ocean crude oil is continuously increased, and the yield of the ocean crude oil is rapidly increased. In the process of crude oil exploitation, a large amount of petroleum associated gas is often produced, the associated gas has the characteristics of inflammability, explosiveness and difficult storage and transportation, and the associated gas can be directly burnt for treatment at the beginning of exploitation due to safety, so that serious energy waste is caused, and the national ocean strategy brings urgent demands for solving the problem. The dual-fuel gas turbine is power equipment capable of effectively solving the problem, not only can provide power for crude oil development, but also can work by adopting petroleum associated gas as gas fuel, and can realize undisturbed online switching between crude liquid fuel and petroleum associated gas under the condition of no shutdown, so that the adaptability of the gas turbine to fuel is improved, the petroleum associated gas is effectively utilized, and the requirements of various fuels under different states in the crude oil development process are met.

The dual fuel combustor and the dual fuel control system are the most important core components of the dual fuel gas turbine, and with the continuous improvement of the requirements of the marine strategy on the high power, low emission and dual fuel gas turbine, the design of the combustor is also put on higher requirements. In addition, the gas fuel associated gas is used for 95% of the overhaul period of the dual-fuel gas turbine, and liquid fuel is only needed when the gas fuel is in fault or the gas fuel supply is regulated occasionally, so that the functional requirement of low emission is urgent when the gas fuel is used.

In order to meet the requirement of low emission when the dual-fuel gas turbine uses associated gas, a nozzle water spraying technology is adopted in the prior art, the temperature of a combustion area is reduced by spraying water in a combustion chamber, the purpose of reducing emission of pollutants such as nitrogen oxides is achieved, the number of matched equipment is increased, an accessory system is complex, the advantages of the gas turbine, such as small size and light weight, are seriously affected, and the application of the dual-fuel gas turbine is limited. The multistage lean combustion premixing technology is adopted, fuel and air are fully and uniformly mixed, a fuel enrichment area is eliminated, the temperature of an outlet of a combustion chamber is uniformly distributed, meanwhile, the temperature of the outlet of the combustion chamber is not more than a rated value due to low fuel gas/air ratio, gao Wenji points are removed, meanwhile, the combustion is efficiently and stably carried out, the limitation can be effectively solved while low emission is realized, the bulletin number is CN102393028B, and the low-emission combustion chamber is invented by adopting the mode, and a good low-emission effect is achieved.

The invention relates to a dual-fuel low-emission burner for a gas turbine, which is disclosed in the patent publication No. CN103486617B, wherein the dual-fuel burner is used by respectively introducing gas fuel and liquid fuel, and meanwhile, the emission of nitrogen oxides is reduced by adopting a lean oil premixing mode. When the main fuel device works, a small amount of cooling air is introduced to cool and protect the end face of the auxiliary burner, but the auxiliary burner generates high-temperature carbon deposition due to poor cooling effect of the small amount of cooling air.

Disclosure of Invention

The invention aims to solve the problem that the auxiliary burner in the existing dual-fuel low-emission burner is easy to generate high-temperature carbon deposition. Further provided are a low emission nozzle, a low emission dual fuel combustor, and a gas turbine generator set.

The technical scheme of the invention is as follows:

The low-emission nozzle comprises a first fuel gas circuit, a second fuel gas circuit, an atomization air circuit, a liquid fuel circuit, a purging air circuit and a nozzle body, wherein the first fuel gas circuit, the second fuel gas circuit, the atomization air circuit and the liquid fuel circuit are arranged on the nozzle body in a mode of inner oil, outer air, staggered oil ways and air channels, the atomization air circuit, the first fuel gas circuit and the liquid fuel circuit ensure that a unit enters a slow car working condition and shares a first air swirler of the first fuel gas circuit, the atomization air circuit, the second fuel gas circuit and the liquid fuel circuit ensure that the unit enters a fast car working condition and shares a second air swirler of the second fuel gas circuit, the purging air circuit is arranged on the fuel ejection side of the nozzle body, and the purging air circuit adopts a mode of impact convection cooling, air film cooling and heat insulation cooling to prevent carbon deposition of a nozzle.

The low-emission dual-fuel combustion chamber comprises a combustion chamber outer shell, a combustion chamber inner shell, a flame tube, a front bearing shell, a rear support shell, a combustion chamber outlet, a diffuser, a combustion chamber inlet, a positioner and a low-emission nozzle, wherein the combustion chamber outer shell is respectively and hermetically connected with the front bearing shell and the rear support shell through a front annular flange, the combustion chamber inner shell is connected with the front bearing shell through the front annular flange and forms a three-dimensional annular working space together with the combustion chamber outer shell, the diffuser is connected to the rear part of the combustion chamber inner shell, the end part of the diffuser is the combustion chamber inlet, the combustion chamber outlet is formed on the rear support shell, the flame tube is mounted in the three-dimensional annular working space, the low-emission nozzle penetrates through a front annular conical surface mounting hole of the front bearing shell and is inserted in a plug hole of the head part of the flame tube, a main combustion hole is formed in the middle part of the flame tube, the head part of the flame tube is connected with two positioners, and a tail mounting seat of the flame tube is mounted on the rear support shell through three-point support.

The gas turbine generator set comprises the low-emission dual-fuel combustion chamber, a low-emission dual-fuel control system, a gas compressor, a turbine and a generator, wherein the low-emission dual-fuel combustion is connected with a low-emission nozzle loop system of the low-emission dual-fuel control system;

High-temperature high-pressure air from the air compressor enters a diffuser from an inlet of a combustion chamber to be subjected to speed reduction and diffusion and then flows into a combustion chamber annular cavity, then the air is distributed into a low-emission nozzle to be mixed with liquid fuel or gas fuel to form a combustible mixture, the combustible mixture is efficiently and stably combusted in a flame tube, and the combustible mixture is discharged from an outlet of the combustion chamber to push a turbine to output work so as to realize power generation of a generator;

Wherein the low emission dual fuel control system comprises a liquid fuel system, a gaseous fuel system, a liquid fuel purge system, a gaseous fuel purge system, an auxiliary atomizing air system, and a low emission nozzle collar system;

The low-emission nozzle loop system comprises a liquid fuel loop, an auxiliary atomization air loop, a gas fuel loop and a gas fuel loop, wherein the liquid fuel loop, the auxiliary atomization air loop, the gas fuel loop and the gas fuel loop are respectively connected with a liquid fuel loop inlet pipe, an auxiliary atomization air loop inlet pipe, a gas fuel first inlet pipe and a gas fuel second inlet pipe on the low-emission nozzle through branch pipes;

when burning liquid fuel:

When the ignition working condition and the slow vehicle working condition are lower than the ignition working condition, the liquid fuel system is put into operation, the gas fuel system is not operated, the liquid fuel purging system is not operated, the gas fuel purging system is put into operation, the auxiliary atomizing air system is put into operation,

At this point, the liquid fuel system enters the liquid fuel loop of the low-emission nozzle loop system through the liquid fuel flow path, and then enters the liquid fuel path of the low-emission nozzle;

The auxiliary atomizing air system enters an auxiliary atomizing air ring pipe through an auxiliary atomizing air flow path and then enters an atomizing air path of the low-emission nozzle to carry out auxiliary atomization on the liquid fuel;

The gas fuel purging system is divided into two flow paths, namely a gas fuel flow path 1 branch purging path and a gas fuel flow path 2 branch purging path, and is used for cleaning and purging the gas fuel ring pipe and the internal channel of the low-emission nozzle in a non-working state;

When the working condition of the slow car is above, the purging air source of the atomizing air channel is adjusted to be supplied to an atomizing air blowing channel of the liquid fuel channel purging system by an auxiliary atomizing air system, namely, the auxiliary atomizing air source is supplied by compressed air in an annular cavity space formed by a combustion chamber shell of the low-emission dual-fuel combustion chamber and the flame tube, and the rest systems are kept unchanged;

when burning gaseous fuel:

Closing the liquid fuel system, putting the gas fuel system into operation, and putting the liquid fuel purging system into operation;

When the ignition working condition and the slow vehicle working condition are as follows:

Compressed air in the annular cavity space of the low-emission dual-fuel combustion chamber enters a liquid fuel path of the liquid fuel system A, a gas fuel path 2 nd branch sweeping path of a gas fuel sweeping system and an auxiliary atomization air path of an auxiliary atomization air system;

The gas fuel enters a gas fuel one-way loop of the low-emission nozzle loop system through the gas fuel system and then enters a gas fuel first inlet pipe of the low-emission nozzle;

The liquid fuel purging system is in a purging working state, and the auxiliary atomization air path inlet pipe and the liquid fuel path inlet pipe are respectively supplied with compressed air in an annular cavity space formed by a combustion chamber shell of the low-emission dual-fuel combustion chamber and the flame tube, so as to purge and cool all channels;

above the slow vehicle working condition:

The gas fuel purging system is closed, and the gas fuel simultaneously enters a gas fuel one-way annular pipe and a gas fuel two-way annular pipe of the low-emission nozzle annular pipe system through the gas fuel system and then respectively enters a first fuel gas circuit and a second fuel gas circuit of the low-emission nozzle;

When the gas fuel and the liquid fuel are combusted and switched, the liquid fuel purging system and the gas fuel purging system are both closed, and the liquid fuel system and the gas fuel system are both put into operation.

Compared with the prior art, the invention has the following effects:

1. The low-emission nozzle adopts the purging air passage, and the purging air passage prevents carbon deposition at the nozzle by adopting the modes of impact convection cooling, air film cooling and heat insulation cooling, so that the temperature of a core working part is effectively reduced, and the service life of the low-emission nozzle is prolonged.

2. The low-emission dual-fuel combustion chamber effectively combines a multi-stage lean premixed low-emission technology with a dual-fuel low-emission nozzle, when the combustion chamber uses gas fuel, the gas fuel and air are injected through small holes on a cyclone of the low-emission nozzle to be well and uniformly mixed, a premixed combustion mode is adopted to reduce pollutant emission values, when the combustion chamber uses liquid fuel, the problem of atomization of the liquid fuel under the same gas distribution structure is solved through the air-assisted atomization low-emission nozzle at the center part of the low-emission nozzle, the aim of reducing pollutant emission of a gas turbine by utilizing the lean premixed combustion technology under the condition of the gas fuel can be achieved on the basis that the low-emission nozzle meets the use requirement of the dual fuel, and the dual-fuel control system is simultaneously provided for effectively working in cooperation with the low-emission dual-fuel combustion chamber provided by the invention, and can supply the gas fuel or the liquid fuel for the whole machine according to the use requirement and adjust the fuel, and can realize online stable switching of the gas/liquid fuel under the condition without stopping, meanwhile, the other fuel is designed to realize high-temperature carbon deposition under the condition of the same fuel distribution structure, the dual-fuel control system can be used for guaranteeing that the dual-fuel control system is designed to realize the low-emission and high-carbon turbine operation, and low-carbon gas turbine operation is realized, and high-efficiency is realized.

3. The gas turbine adopts the liquid fuel to actively supply auxiliary atomization air into the liquid low-emission nozzle air path when the gas turbine is started and runs under low working conditions, so that the ignition performance and the combustion efficiency are improved, and the air in the combustion chamber is pressed into the low-emission nozzle air path under the action of pressure difference by using the compressed air in the annular cavity in the combustion chamber under high working conditions, so that the atomization of the liquid fuel is enhanced, the combustion efficiency is further improved, the problem of poor atomization effect under the conditions of ignition and slow vehicles can be conveniently and effectively solved under the single liquid fuel path, and the use requirement of dual fuel is met.

4. When the gas fuel is used for working, the uniform mixing degree of the gas fuel and the air is improved through a two-stage lean-burn premixing mode, wherein the air quantity ratio of the first path of air swirler 2-5 and the second path of air swirler 2-9 is 1:7, the two-stage lean-burn premixing mode is matched with the fuel fed by the 1 st branch B0-1 of the gas fuel and the 2 nd branch B0-2 of the gas fuel, the equivalent ratio of the two-stage combustion area is controlled to be the same and is in a low emission area of 2.5-4.5, the temperature of the combustion area is further ensured to be in a low emission combustion temperature control area of 1700-1900 ℃, so that efficient and stable combustion is realized, the emission value of NOx is controlled in a low emission range, and a main combustion hole is designed in the middle of the flame tube, the air and the fuel are further mixed, the temperature of the main combustion area is reduced, the emission reducing effect is enhanced, and finally the emission standard of GB13223-2011 is reached or better.

5. When the gas turbine adopts gas fuel, only the first path of air swirler 2-5 and the gas fuel 1 st branch B0-1 supply component are used during starting and low-working condition operation, and when the gas turbine operates under high working condition, the second path of air swirler 2-9, the gas fuel 2 nd branch B0-2 and the gas fuel 1 st branch B0-1 work together, so that the gas fuel and the air can be fully mixed, and the pollutant emission is lower. Through the effective combination of good atomization of liquid fuel during the operation of slow-running working condition and high working condition and the overall design of taking into account the low emission use of gas fuel, the gas turbine is realized in the high-efficient operation of full working condition multi-fuel, the congenital advantages of small volume and light weight of the gas turbine are maintained, the application fuel range of the gas turbine is widened, the emission of nitrogen oxides is reduced, and the high-efficient utilization of energy is realized.

6. The low-emission dual-fuel control system can supply gas fuel or liquid fuel for the whole machine according to the use requirement, regulate the fuel, realize the online stable switching of the gas fuel and the liquid fuel under the condition of no shutdown, and simultaneously, prevent the high-temperature carbon deposition of one fuel in the other fuel path when the fuel works, and design a purging system in the fuel control system to prevent the carbon deposition of the fuel path.

7. According to the invention, by means of integrated design of the dual-fuel low-emission nozzle, liquid fuel diffusion combustion and gas fuel premixing combustion are combined together, the technical problems of complicated structural member forming and core part precision machining are solved by means of combining additive manufacturing and machining, good work of the dual-fuel low-emission nozzle under different working conditions of the gas turbine is achieved, when the gas turbine uses the gas fuel, the gas fuel and air are well mixed through small holes on a low-emission nozzle cyclone, pollutant emission values are reduced by means of premixing combustion, when the gas turbine uses the liquid fuel, the problem that the liquid fuel atomization effect is poor when the gas turbine uses the low-emission nozzle is solved by means of air-assisted atomization low-emission nozzle in the center of the low-emission nozzle, the aim of reducing the pollutant emission of the gas turbine by means of a lean premixed combustion technology under the condition of the low-emission nozzle can be fulfilled, meanwhile, the dual-emission dual-fuel control system can supply the gas turbine with the gas fuel or the liquid fuel according to the use requirement and perform fuel adjustment, stable switching of the gas fuel/liquid fuel can be achieved under the condition without stopping, and meanwhile, the purpose of purging of one fuel is achieved by designing a carbon-based fuel on-line control system, and the purpose of preventing carbon deposition in the other fuel system is achieved.

Drawings

FIG. 1 is a schematic illustration of the structure of a gas turbine generator set of the present invention;

FIG. 2 is a schematic view of the internal structure of the low-emission nozzle of the present invention;

FIG. 3 is a front view of the low discharge nozzle of the present invention;

FIG. 4 is a right side view of FIG. 3;

FIG. 5 is a left side view of FIG. 3;

Fig. 6 is a schematic structural view of the seal assembly.

Detailed Description

The first embodiment is described by referring to fig. 1 to 6, the low-emission nozzle of the present embodiment includes a first fuel gas path, a second fuel gas path, an atomization air path, a liquid fuel path, a purge air path and a nozzle body, wherein the first fuel gas path, the second fuel gas path, the atomization air path and the liquid fuel path are installed on the nozzle body in a mode of alternately arranging the oil paths and the gas paths according to inner oil and outer gas, the atomization air path, the first fuel gas path and the liquid fuel path ensure that a unit enters a slow car working condition and shares a first path air swirler 2-5 of the first fuel gas path, the atomization air path, the second fuel gas path and the liquid fuel path ensure that the unit enters a fast car working condition and shares a second path air swirler 2-9 of the second fuel gas path, the purge air path is installed on a fuel ejection side of the nozzle body, and the purge air path adopts a mode of impact convection cooling, air film cooling and heat insulation cooling to prevent carbon deposition of nozzles.

The nozzle in the embodiment is a low-emission dual-fuel low-emission nozzle, two fuel paths are integrated, a low-emission nozzle shell and a cyclone are integrally formed by adopting an additive manufacturing and processing mode, a core component of the low-emission nozzle oil path is independently processed by adopting a fine machining mode and is detachable, and a mode of combining additive manufacturing and machining is adopted to ensure effective forming of a complex structural member and processing precision requirements of a precise member.

Second embodiment in connection with fig. 2, the nozzle body of the present embodiment includes a low-emission nozzle housing 5-1 and a combustor cover plate 5-2, and the combustor cover plate 5-2 is mounted on a fuel inlet of the low-emission nozzle housing 5-1. So set up, be convenient for with the flame tube connection cooperation of combustion chamber, realize the ignition function. Other compositions and connection modes are the same as those of the first embodiment.

In a third embodiment, referring to FIG. 2, the liquid fuel circuit of the present embodiment comprises a liquid fuel swirler 1-1, a screw plug 1-4, a sealing cap 1-17, a sealing assembly, a cock 1-14, a liquid fuel heat-insulating pipe 1-13, a liquid fuel inlet pipe 1-9, a liquid fuel circuit connection cap 1-10, a liquid fuel circuit connection cone 1-11 and a liquid fuel filter assembly 1-12, the liquid fuel circuit connection cone 1-11 is inserted on a combustor cap plate 5-2, the liquid fuel filter assembly 1-12 is mounted in the liquid fuel circuit connection cone 1-11, the liquid fuel inlet pipe 1-9 is mounted on the liquid fuel circuit connection cone 1-11 through the liquid fuel circuit connection cap 1-10, the liquid fuel swirler 1-1 and the screw plug 1-4 are coaxially mounted in a low-emission nozzle housing 5-1, the sealing cap 1-17 seals the screw plug 1-4 through the sealing assembly, the liquid fuel heat-insulating pipe 1-13 is screwed on the sealing cap 1-17, and both ends of the liquid fuel heat-insulating pipe 1-13 are respectively communicated with the liquid fuel swirler 1-1 and the liquid fuel pipe 1-11. So set up, this embodiment has designed liquid fuel thermal-insulated pipe 1-13 in the outside of oil circuit (referring to liquid fuel way), prevents that the fuel from depositing carbon in the pipeline, has designed the purge air circuit of preventing depositing carbon in low emission nozzle spout department, can effectively prevent the high temperature carbon deposition of fuel spout. Wherein the liquid fuel inlet pipes 1-9 are heat-insulating inlet pipes, and other compositions and connection modes are the same as those of the first or second embodiment.

In a fourth embodiment, referring to fig. 6, the seal assembly of the present embodiment includes a ring 1-15, a seal ring 1-16, and a steel ring 1-18, where the seal ring 1-16 is an annular seal ring, a tapered stepped groove 1-16-1 is provided at an upper portion of the seal ring 1-16, the steel ring 1-18 is sealingly embedded in the seal ring 1-16, an outer side surface of a lower portion of the ring 1-15 is tapered, the ring 1-15 is inserted in the stepped groove 1-16-1 of the seal ring 1-16, and an upper end surface of the ring 1-15 is lower than an upper end surface of the seal ring 1-16.

The ring 1-15, the sealing ring 1-16 and the steel ring 1-18 are integrally formed, wherein the upper part of the sealing ring wraps the ring 1-15, and when the sealing ring is positioned in the injection slot of the sealing cover 1-17 and the low-emission nozzle shell 5-1, the purpose of closer connection can be achieved. Meanwhile, when the sealing rings 1-16 and the steel rings 1-18 are used for a long time, especially under the influence of high-temperature environment, the phenomenon of thermal expansion can possibly occur, and under the action of the steel rings, the sealing effect is further improved, and the sealing failure is avoided.

In addition, the upper end face of the circular ring 1-15 is lower than the upper end face of the sealing ring 1-16, at this time, when the cock 1-14 is screwed, a pressing force is applied to the sealing assembly, and a gap between the cock 1-14 and the sealing cover 1-17 is sealed, so that the sealing ring is prevented from being invalid or leaking oil and seepage oil, and further smooth work of the low-emission nozzle is ensured.

Other compositions and connection modes are the same as those of the first, second or third embodiments.

In a fifth embodiment, referring to fig. 2, an atomization air path of the present embodiment includes an atomization air cyclone 1-2, a cap 1-3, an auxiliary atomization air path inlet pipe 1-6, an auxiliary atomization air path connection cap 1-7, and an auxiliary atomization air path taper pipe 1-8, the atomization air cyclone 1-2 is sleeved on the liquid fuel cyclone 1-1 and a screw plug 1-4, the cap 1-3 is sleeved on the atomization air cyclone 1-2 and is located at one side of the liquid fuel cyclone 1-1, the auxiliary atomization air path inlet pipe 1-6 is mounted on a combustion chamber cover plate 5-2, the auxiliary atomization air path inlet pipe 1-6 is connected with the auxiliary atomization air path taper pipe 1-8 through the auxiliary atomization air path connection cap 1-7, and the bottom of the auxiliary atomization air path taper pipe 1-8 is communicated with the atomization air cyclone 1-2 through the auxiliary atomization air path 1-5. The atomization air path according to the present embodiment can effectively atomize and spray oil in the liquid fuel path, and promote ignition. Other compositions and connection modes are the same as those in any one of the first to fourth embodiments.

In a sixth embodiment, referring to fig. 2, the first fuel gas circuit of the present embodiment includes a first gas fuel inlet pipe 2-1, a first gas fuel coupling cap 2-2, a first gas fuel coupling cone pipe 2-3, a clip 2-4, a first air swirler 2-5, a first premixed way pressing piece 2-6, a first cup assembly 2-7, and a second cup assembly 2-8;

The gas fuel first connecting taper pipe 2-3 is arranged on the combustion chamber cover plate 5-2, the gas fuel first inlet pipe 2-1 is arranged on the gas fuel first connecting taper pipe 2-3 through the gas fuel first connecting cap cover 2-2, the bow clamp 2-4 is arranged at the fuel spraying side end part of the low emission nozzle shell 5-1, the first air cyclone 2-5 is arranged at the rear end of the bow clamp 2-4, the premixing first air compressing piece 2-6 and the first air cyclone 2-5 are coaxially inserted at the tail part of the first air cyclone 2-5, the first cup-shaped component 2-7 and the second cup-shaped component 2-8 are arranged on the premixing first air compressing piece 2-6 from inside to outside, and the bottom of the gas fuel first connecting taper pipe 2-3 is communicated with the first air cyclone 2-5 through a first air passage channel. So set up, be convenient for realize gas combustion, can also provide convenience for the purge system, prevent the production of low emission nozzle carbon deposit. Other compositions and connection modes are the same as those in any one of the first to fifth embodiments.

A seventh embodiment is described with reference to fig. 2, wherein the second fuel gas circuit of the present embodiment includes a second air swirler 2-9, a second swirler housing 2-10, a second gas fuel inlet pipe 3-1, a second gas fuel coupling cap 3-2, a second gas fuel coupling cone pipe 3-3, a cover 3-4, a ferrule 3-5, and a premixed second compression piece 3-6;

The second path of cyclone shell 2-10 is installed on the first path of air cyclone 2-5 through a sealing cover 3-4, the second path of air cyclone 2-9 is installed on the second path of cyclone shell 2-10, the premixing second path of compacting piece 3-6 is installed on the second path of cyclone shell 2-10 through a ferrule 3-5, the gas fuel second connecting taper pipe 3-3 is installed on the combustion chamber cover plate 5-2, the gas fuel second inlet pipe 3-1 is connected with the gas fuel second connecting taper pipe 3-3 through a gas fuel second connecting cap 3-2, and the gas fuel second connecting taper pipe 3-3 is communicated with the second path of air cyclone 2-9 through a second gas path channel. So set up, be convenient for realize gas combustion, can also provide convenience for the purge system, prevent the production of low emission nozzle carbon deposit. Other compositions and connection modes are the same as those in any one of the first to fifth embodiments.

The eighth embodiment describes the present embodiment with reference to fig. 2 to 4, where the purge air path of the present embodiment includes an impingement convection cooling air path, a film cooling air path, and a heat insulation cooling air path, and in which:

The impact convection cooling air path is that a plurality of two-way carbon deposit prevention cold state blowing holes 6-3 are formed in a second-way cyclone shell 2-10, external cold air flows in from the two-way carbon deposit prevention cold state blowing holes 6-3, flows in an internal cooling channel formed by the second-way cyclone shell 2-10, a premixed first-way compression piece 2-6 and a first cup-shaped component 2-7, and performs impact cooling on the premixed first-way compression piece 2-6 through a plurality of rows of holes on the first cup-shaped component 2-7 under the action of air pressure difference, and cold air of an external blowing system is blown out to a combustion space in the two-way carbon deposit prevention cold state blowing one nozzle 6-4 and the two-way carbon deposit prevention cold state blowing two nozzle 6-5 to form a heat insulation protection air film, and finally, the temperature of the premixed first-way compression piece 2-6 is reduced in a mode of combining impact convection cooling and air film cooling;

the air film cooling air path is that a plurality of carbon deposit prevention cold state blowing holes 6-1 are formed in a first air cyclone 2-5, cold air of an external blowing system enters from the plurality of carbon deposit prevention cold state blowing holes 6-1 and flows in a cooling channel in the cap cover 1-3, and finally, one nozzle 6-2 is blown out from the carbon deposit prevention cold state blowing to a combustion space to form a heat insulation protection air film, so that the temperature of the cap cover 1-3 is reduced;

the heat-insulating cooling air path is characterized in that a plurality of three-way cooling carbon deposition-preventing cold state purging holes 6-6 are formed in the ferrule 3-5, cold air of an external purging system enters the second-path cyclone shell 2-10 from the three-way cooling carbon deposition-preventing cold state purging holes 6-6, flows in an internal cooling channel formed by the ferrule 3-5 and the premixed second-path compressing piece 3-6, and finally is sprayed out to a combustion space from the holes in the premixed second-path compressing piece 3-6 to form a heat-insulating protection air film, so that the temperature of the premixed second-path compressing piece 3-6 is reduced.

The purging air path of the embodiment is provided with 3 air cooling channels in total, namely an oil path carbon deposition prevention purging path (an air film cooling air path), a cooling purging (an impact convection cooling air path) of the premixed first path compacting piece 2-6 and a cooling purging (a heat insulation cooling air path) of the premixed second path compacting piece 3-6;

One strand of cooling air flows into the low-emission nozzle from one channel of cold state purging holes 6-1 for preventing carbon deposition, flows in a cooling channel in the cap cover 1-3, and finally is sprayed to a combustion space from one channel of nozzles 6-2 for preventing carbon deposition in a cold state purging mode to form a heat-insulating protection air mold, so that the temperature of the cap cover 1-3 is reduced, and carbon deposition is prevented;

The other cooling air flows into the low-emission nozzle from the cooling blowing path 6-3, flows in an internal cooling channel formed by the second path cyclone shell 2-10, the premixed first path compression piece 2-6 and the first cup-shaped component 2-7, and performs impact cooling on the premixed first path compression piece 2-6 through a plurality of rows of holes on the first cup-shaped component 2-7 under the action of pressure difference, and finally is sprayed into a combustion space from the two paths of carbon deposit prevention cold state blowing one nozzle 6-4 and the two paths of carbon deposit prevention cold state blowing two nozzle 6-5 to form a heat insulation protection air mold, and the two modes of impact convection cooling and air film cooling are combined to reduce the temperature of the premixed first path compression piece 2-6 and protect the premixed first path compression piece 2-6;

The third cooling air flows into the low-emission nozzle from the three paths of cooling carbon deposition preventing cold state purging holes 6-6, flows in the cooling channel formed by the second path of cyclone shell 2-10, the ferrule 3-5 and the premixing second path of compacting pieces 3-6, and finally is sprayed to the combustion space from the plurality of small holes on the premixing second path of compacting pieces 3-6 to form a heat insulation protection air model, so that the temperature of the premixing second path of compacting pieces 3-6 is reduced. Other compositions and connection modes are the same as those of any one of the first to seventh embodiments.

In a ninth embodiment, referring to fig. 4, the two-way carbon deposition-preventing cold purging first nozzle 6-4 and the two-way carbon deposition-preventing cold purging second nozzle 6-5 are both formed on the pre-mixing first-way pressing member 2-6 in a ring array manner. The device is convenient for forming an annular air film for cooling, and other components and connecting modes are the same as any one of the eighth embodiment.

In the tenth embodiment, referring to fig. 4, the two-way carbon deposition prevention cold purging nozzle 6-4 of the present embodiment is an oval nozzle, and the plurality of two-way carbon deposition prevention cold purging nozzle 6-4 are annularly arranged in an inclined manner. So set up, be convenient for form the annular air film that has the rotation angle, this kind of air film is more firm, in the unit length moreover, the whirl area of air current and external contact is big, and the cooling effect is good. Other compositions and connection modes are the same as any one of the first to ninth embodiments.

In an eleventh embodiment, referring to fig. 4, the two-way carbon deposition prevention cold purge two nozzles 6-5 of the present embodiment are rectangular nozzles. So set up, the cold air of direct spun can cool down corresponding part fast. Other compositions and connection modes are the same as those of any one of the first to tenth embodiments.

The low-emission nozzle provided by the invention is an integral structure and mainly comprises a first fuel gas path, a second fuel gas path, an atomization air path, a liquid fuel path and a purging air path for preventing carbon deposition.

The two fuel paths (namely a liquid fuel path and a fuel gas path) adopt an integrated design idea, the low-emission nozzle shell and the cyclone are integrally formed in an additive manufacturing and processing mode, the core component of the low-emission nozzle oil path is independently processed in a fine machining mode and is detachable, and the effective forming of a complex structural member and the processing precision requirement of a precise member are ensured by adopting a mode of combining additive manufacturing and machining. The low-emission nozzle is provided with 2 gas fuel paths (referred to as fuel paths), 1 liquid fuel and 1 atomization air path, wherein the inner side is the liquid fuel path, the outer side is the gas fuel path, liquid and gas fuel paths are arranged in a staggered manner, the atomization air path, the liquid fuel path and the first fuel path can ensure that a gas turbine generator set (hereinafter referred to as a set) enters a slow vehicle working condition, the liquid fuel path and the first fuel path share a first path of air swirler 2-5, the atomization air path, the liquid fuel path and the second fuel path ensure that the set enters a maximum working condition, the liquid fuel path and the second fuel path share a second path of air swirler 2-9, a liquid fuel heat insulation pipe is designed on the outer side of the upstream of the liquid fuel path, so that liquid fuel is prevented from accumulating in a pipeline, a purge air path for preventing carbon accumulation is designed at a nozzle of the low-emission nozzle, and high-temperature carbon accumulation of the liquid fuel nozzle can be effectively prevented. The first fuel gas path and the second fuel gas path are provided with gas fuel channels, the channels are connected with a cap cover, gas outlet holes are uniformly distributed on the end face of the cap cover, the cap cover is positioned in a radial air cyclone, the periphery of the cyclone, which is positioned on the cap cover, is provided with an annular cavity, a shell is provided with a fuel inlet channel communicated with the annular cavity, the cyclone is provided with a fuel outlet channel communicated with the annular cavity, the liquid fuel cyclone atomization assembly comprises a liquid fuel channel, a liquid fuel cyclone, a liquid fuel nozzle and an anti-carbon deposition gas cooling device, and the liquid fuel auxiliary atomization assembly comprises an auxiliary atomization air channel, an auxiliary atomization air cyclone and an auxiliary atomization air nozzle. The detachable compression fixing component is connected with the low-emission nozzle shell in a threaded mode by a sealing cover, a gasket and a screw plug, so that the trimming, cleaning and replacement of core working parts are facilitated, the development period of the low-emission nozzle is shortened, and the service life of the low-emission nozzle is prolonged. The liquid fuel nozzle prevents the carbon deposition air cooling component from forming an air cooling channel from the front normal air inlet of the first path of air swirlers 2-5 to the outer ring of the central liquid fuel nozzle, thereby effectively reducing the temperature of the core working part, the compressing piece prevents the carbon deposition air cooling component from being ejected by two paths of rotation from the air inlet of the inclined hole between the first path of air swirlers 2-5 and the second path of air swirlers 2-9 to the outlet edge of the compressing piece, and the temperature of the compressing piece is reduced through impact cooling and air film cooling.

The low-emission dual-fuel combustion chamber of the embodiment is explained by combining with FIG. 1, and comprises a combustion chamber outer shell 8-1, a combustion chamber inner shell 8-2, a flame tube 8-3, a front bearing shell 8-4, a rear support shell 8-5, a combustion chamber outlet 8-5A, a diffuser 8-6, a combustion chamber inlet 8-6A, a positioner 8-7 and a low emission nozzle, wherein the combustion chamber outer shell 8-1 is respectively connected with the front bearing shell 8-4 and the rear support shell 8-5 in a sealing manner through a front annular flange, the combustion chamber inner shell 8-2 is connected with the front bearing shell 8-4 through a front annular flange and forms a three-dimensional combustion chamber annular cavity 8A together with the combustion chamber outer shell 8-1, the diffuser 8-6 is connected to the rear part of the combustion chamber inner shell 8-2, the end part of the diffuser 8-6 is a combustion chamber inlet 8-6A, the combustion chamber outlet 8-5A is arranged on the rear support shell 8-5, the flame tube 8-3 is arranged in the three-dimensional annular working space, the flame tube 8-3 is arranged in the three-dimensional working space, the flame tube 8-3 is connected with the front support shell 8-3 through a front annular flange, and the flame tube 8-3 is provided with a three-conical surface, and flame tube 3 is arranged in the middle part is arranged in the front support shell 8-3, and flame tube is connected with the flame tube 8-3.

The low-emission nozzle penetrates through a conical surface mounting hole of a front ring of the front bearing shell to be inserted into a head insertion hole of the flame tube and is fixed and sealed through a low-emission nozzle mounting flange, a main combustion hole is formed in the middle of a tube body of the flame tube, the main combustion hole is supported and fixed through a head connecting two positioners and a tail mounting seat at three points, a combustion chamber shell is connected with the front bearing shell and a rear supporting shell through a front annular flange to ensure sealing, a combustion chamber inner shell is connected with the front bearing shell through a front annular flange to form a three-dimensional annular working space together with the combustion chamber inner shell, a diffuser is connected to the rear part of the combustion chamber inner shell, and the combustion chamber rear supporting shell is used for providing a mounting seat for installing the flame tube and a combustion chamber outlet.

Other compositions and connection modes are the same as those in any one of the first to eleventh embodiments.

Thirteenth embodiment description of the present embodiment is made with reference to fig. 1 to 6, in which the low-discharge nozzle according to the present embodiment is the low-discharge nozzle according to any one of embodiments 1 to 11. Other compositions and connection modes are the same as those of any one of the first to the twelfth embodiments.

Description of the embodiments fourteen the present embodiment is described in connection with fig. 1-6, a gas turbine power generator set comprising a low emission dual fuel combustor 8, a low emission dual fuel control system, a compressor 7, a turbine 9 and a generator 10 as described in embodiments 12-13, the low emission dual fuel combustor 8 being connected to a low emission nozzle collar system F of the low emission dual fuel control system,

High-temperature high-pressure air from the air compressor 7 enters a diffuser 8-6 from a combustion chamber inlet 8-6A for speed reduction and diffusion and flows into a combustion chamber annular cavity 8A, then the air is distributed into a low-emission nozzle 11 and is mixed with liquid fuel or gas fuel to form a combustible mixture, the combustible mixture is efficiently and stably combusted in a flame tube 8-3, and is discharged from a combustion chamber outlet 8-5A to push a turbine 9 to output work so as to realize power generation of a generator 10;

the low-emission dual-fuel control system comprises a liquid fuel system A, a gas fuel system B, a liquid fuel purging system C, a gas fuel purging system D, an auxiliary atomizing air system E and a low-emission nozzle loop system F;

The low-emission nozzle loop system F comprises a liquid fuel loop pipe 1-9H, an auxiliary atomization air loop pipe 4-1H, a gas fuel loop pipe 2-1H and a gas fuel two-way loop pipe 3-1H, wherein the liquid fuel loop pipe 1-9H, the auxiliary atomization air loop pipe 4-1H, the gas fuel loop pipe 2-1H and the gas fuel two-way loop pipe 3-1H are respectively connected with a liquid fuel path inlet pipe 1-9, an auxiliary atomization air path inlet pipe 1-6, a gas fuel first inlet pipe 2-1 and a gas fuel second inlet pipe 3-1 on a low-emission nozzle through branch pipes;

when burning liquid fuel:

When the ignition working condition and the slow vehicle working condition are lower than the ignition working condition, the liquid fuel system A is put into operation, the gas fuel system B is not operated, the liquid fuel purging system C is not operated, the gas fuel purging system D is put into operation, the auxiliary atomizing air system E is put into operation,

At this time, the liquid fuel system A enters the liquid fuel loops 1-9H of the low-emission nozzle loop system F through the liquid fuel flow path A0, and then enters the liquid fuel path of the low-emission nozzle;

The auxiliary atomizing air system E enters the auxiliary atomizing air ring pipe 4-1H through an auxiliary atomizing air flow path E0 and then enters an atomizing air path of the low-emission nozzle to carry out auxiliary atomization on the liquid fuel;

The gas fuel purging system D is divided into two flow paths, namely a branch 1 purging path D0-1 of the gas fuel flow path and a branch 2 purging path D0-2 of the gas fuel flow path, and cleaning and purging are carried out on the gas fuel ring pipe and the internal channel of the low-emission nozzle in a non-working state;

When the working condition of the slow car is above, the purging air source of the atomizing air channel is regulated to be supplied by an atomizing air purging channel C0-2 of the liquid fuel channel purging system C by an auxiliary atomizing air system E, namely, the auxiliary atomizing air source is supplied by compressed air in an annular cavity space formed by a combustion chamber shell of the low-emission dual-fuel combustion chamber and a flame tube, and the rest systems are kept unchanged;

when burning gaseous fuel:

the liquid fuel system A is closed, the gas fuel system B is put into operation, and the liquid fuel purging system C is put into operation;

When the ignition working condition and the slow vehicle working condition are as follows:

compressed air in the annular cavity space of the low-emission dual-fuel combustion chamber enters a liquid fuel path A0 of the liquid fuel system A, a gas fuel flow path 2 branch blowing path D0-2 of the gas fuel blowing system D and an auxiliary atomization air path E0 of the auxiliary atomization air system E;

the gas fuel enters a gas fuel one-way loop 2-1H of a low-emission nozzle loop system F through a gas fuel system B and then enters a gas fuel first inlet pipe 2-1 of a low-emission nozzle;

The liquid fuel purging system C is in a purging working state, and the auxiliary atomization air path inlet pipes 1-6 and the liquid fuel path inlet pipes 1-9 are respectively supplied with compressed air in an annular cavity space formed by a combustion chamber shell of the low-emission dual-fuel combustion chamber and the flame tube, so as to purge and cool all channels;

above the slow vehicle working condition:

The gas fuel purging system D is closed, and the gas fuel passes through the gas fuel system B and simultaneously enters a gas fuel one-way loop pipe 2-1H and a gas fuel two-way loop pipe 3-1H of the low-emission nozzle loop pipe system F, and then enters a first fuel gas circuit and a second fuel gas circuit of the low-emission nozzle respectively;

When the gas fuel and the liquid fuel are combusted and switched, the liquid fuel purging system C and the gas fuel purging system D are both closed, and the liquid fuel system A and the gas fuel system B are both put into operation.

The combustion chamber and the fuel control system can realize low pollutant emission when the gas turbine uses gas fuel in the high-working-condition operation process, can perform on-line stable switching of the gas fuel and liquid fuel under the condition of no shutdown, and can meet the purposes of stable combustion, stable on-line switching and pollutant emission reduction of the dual-fuel of the gas turbine.

Other compositions and connection modes are the same as those in any one of the first to thirteenth embodiments.

The low-emission dual-fuel control system comprises a liquid fuel system A, a gas fuel system B, a liquid fuel purging system C, a gas fuel purging system D, an auxiliary atomizing air system E, an auxiliary atomizing air and a combustion chamber annular cavity air entraining, wherein when a body fuel is combusted, the liquid fuel system A is put into operation, the gas fuel system B is not operated, the liquid fuel purging system C is not operated, the gas fuel purging system D is put into operation, at the moment, the liquid fuel enters a liquid fuel annular pipe of a low-emission nozzle annular pipe system F, then enters a liquid fuel path of a low-emission dual-fuel low-emission nozzle, auxiliary atomizing air and combustion chamber annular cavity air entraining respectively enter an auxiliary atomizing air annular pipe of the low-emission nozzle annular pipe system F, then enter an atomizing air path of the low-emission dual-fuel low-emission nozzle to carry out auxiliary atomization of the liquid fuel, and the combustion chamber annular cavity air entraining enters a first fuel path and a second fuel path to carry out purging;

When the working condition of the slow car is above, the purging of the auxiliary atomizing air flow path is adjusted to the operation of the atomizing air purging flow path of the liquid fuel path purging system C by the auxiliary atomizing air system E, namely, all the atomizing air purging flow paths are switched to the compressed air of the combustion chamber annular cavity, and the other systems are kept unchanged;

When the gas fuel is combusted, the liquid fuel system A is closed, the gas fuel system B is put into operation, the liquid fuel purging system C is put into operation, when the operation is lower than the slow vehicle operation, compressed air in the combustion chamber annular cavity enters a liquid fuel path of the liquid fuel system A, a2 nd branch of a gas fuel flow path of the gas fuel purging system D blows off the path D0-2 and an auxiliary atomization air path of the auxiliary atomization air system E, the gas fuel enters a 2-1H gas fuel annular pipe of the low emission nozzle annular pipe system F through the gas fuel system B, then enters a first fuel gas path of the low emission nozzle, compressed air in the combustion chamber annular cavity enters the 2 nd branch B0-2 gas fuel and then enters a second fuel gas path of the low emission nozzle for purging, and when the operation is higher than the slow vehicle operation, the gas fuel purging system D is closed, the gas fuel enters the 2-1H gas fuel annular pipe and the 3-1H gas fuel annular pipe of the low emission nozzle annular pipe system F at the same time through the gas fuel system B, and then enters the first fuel gas path and the second fuel gas path of the low emission nozzle respectively.

When fuel switching combustion is carried out, the liquid fuel purging system C and the gas fuel purging system D do not work, and the liquid fuel system A and the gas fuel system B are put into operation; when the gas fuel is switched to be in liquid fuel operation, the opening of a regulating valve of a gas fuel system B is gradually reduced, the gas fuel flow is gradually reduced, the opening of a regulating valve of a liquid fuel system A is gradually increased, the liquid fuel flow is gradually increased, when the liquid fuel is switched to be in gas fuel operation, the opening of a regulating valve of the liquid fuel system A is gradually reduced, the liquid fuel flow is gradually reduced, the opening of a regulating valve of the gas fuel system B is gradually increased, the gas fuel flow is gradually increased, the increasing and decreasing rates of the liquid fuel and the heating value of the gas fuel are matched according to the heating values, namely, the product of the increasing rate of the liquid fuel and the heating value of the gas fuel is equal, or the product of the decreasing rate of the liquid fuel and the heating value of the gas fuel is equal, and the product of the heating value of the gas fuel is equal, and the increasing rate of the heating value of the gas fuel is strictly controlled, and the increasing and decreasing rates of the liquid fuel are strictly controlled to realize the shortest switching time (the switching time means that when a switching command is started, the time is used for completely switching the current working fuel to be the other fuel to be in operation in the process, and the unit power fluctuation means that the unit power is stable in the switching process, the ratio of the maximum power and the power fluctuation of the unit power is stable in the operation is ensured to be within a power range of 10% of the power, and the power fluctuation is not required to be in general 10% of the power grid power.

The auxiliary atomizing air system E is provided with an orifice plate, and can be used for adjusting the pressure and flow of auxiliary atomizing air during operation, so that the phenomenon that the liquid fuel is burnt incompletely to cause the unit to generate thermal suspension (the phenomenon that the rotating speed of the unit cannot be normally increased in the starting process of a gas turbine regardless of the increase of fuel) is prevented, and when the gas turbine is higher than the slow vehicle working condition, an atomizing air blowing path of a liquid fuel blowing system is put into operation, and the auxiliary atomizing air is adjusted to be combustion chamber annular cavity compressed air, so that the atomizing effect of the liquid fuel is further improved when the gas turbine is in the above working condition;

When the liquid fuel is combusted, the auxiliary atomizing air system E is put into operation to perform auxiliary atomization of the liquid fuel from starting to a slow vehicle working condition, when the auxiliary atomizing air system E is higher than the slow vehicle working condition, the auxiliary atomizing air is switched into combustion chamber annular cavity compressed air to further improve the atomization effect of the liquid fuel in the working condition above the slow vehicle, when the gaseous fuel is combusted, the combustion chamber bleed air is used for purging an oil way, when the gaseous fuel is combusted, only the gas fuel 1 st branch (referred to as the gas fuel 1 st branch B0-1) works from starting to the slow vehicle working condition, when the auxiliary atomizing air system E is higher than the slow vehicle working condition, the gas fuel 2 nd branch (referred to as the gas fuel 2 nd branch B0-2) stops purging and is put into the gas fuel to work, and as the working condition increases, the gas fuel 1 st branch and the gas fuel 2 nd branch fuel start to decrease simultaneously, the gas fuel 2 nd branch fuel continues to increase until the working condition and the equivalent ratio alpha of the corresponding combustion areas of the two fuel ways is the same.

When the gaseous fuel is combusted, the engine is started to a slow engine working condition, the fuel quantity is related to an exponential function of the high-pressure rotating speed of the gas turbine, and the opening degree of the 1 st branch fuel regulating valve of the gaseous fuel is controlled in real time through the equivalence ratio, so that the stability of combustion is ensured, and flameout in the starting process is prevented.

When the liquid fuel is combusted, the auxiliary atomizing air system E is provided with a throttle plate under the condition of starting to a slow vehicle so as to adjust the pressure and flow of the auxiliary atomizing air and prevent the fuel atomizing effect from being deteriorated due to the fact that the pressure of the auxiliary atomizing air is too high or too low, and the fuel is incompletely combusted, so that the unit generates a thermal suspension phenomenon.

The equivalent ratio alpha of the combustion zone realizes the low emission range of 2.5-4.5, ensures that the temperature of the combustion zone is in a low emission combustion temperature control interval, and finally reaches or is better than the emission standard of GB 13223-2011.

In the aspect of gas state fuel regulation, when gas fuel is combusted, the gas-entraining of a combustion chamber is used for purging a liquid fuel path, when the gas fuel is started to a slow state, only a first fuel path works, the fuel quantity is related to a function of the high-pressure rotating speed of the gas turbine, the opening of a1 st gas fuel regulating valve is controlled in real time through an equivalent ratio to ensure the stability of combustion, so that flameout of the combustion chamber in the starting process is prevented, when the gas fuel is combusted, the purging of a 2 nd gas fuel path is stopped, the gas fuel is simultaneously thrown to work, and along with the further rising of the working condition, the fuel quantity of the 1 st gas fuel path (the first fuel path) and the 2 nd gas fuel path (the second fuel path) is simultaneously increased, when the middle working condition (which is generally selected according to the characteristics of the gas turbine) is reached, the fuel of the 1 st gas fuel path starts to descend, and the fuel of the 2 nd gas fuel path continues to be increased until the equivalent ratio of corresponding combustion areas of the two gas paths is basically the same when the equivalent ratio is equal when the gas turbine is rated, so that the gas turbine achieves the lowest pollutant emission target.

The flame tube of this embodiment is provided with the main fire hole, is located the barrel middle part, and quantity is 8, along middle cross-section symmetric distribution, provides the air that supplements and fuel mixes on the one hand, reduces main fire district temperature, strengthens and falls the emission effect, on the other hand adjusts combustion chamber export temperature distribution uniformity, extension unit whole overhaul period.

The liquid fuel system and the gas fuel system of the present embodiment are both provided with a filter, ensuring cleanliness of the fuel. The liquid fuel cyclone atomization assembly is provided with the inlet filtering assembly, impurities in an incoming flow medium can be effectively removed, the reliability and the service life of the low-emission nozzle are improved, and the liquid fuel cyclone atomization assembly is fixed through the detachable stop ring, so that the liquid fuel cyclone atomization assembly is convenient to replace and clean.

The 1 st path gas fuel supply assembly and the 2 nd path gas fuel supply assembly of the embodiment are both provided with throttling assemblies, and can be used for accurately adjusting the gas fuel flow, so that the flow consistency of a plurality of low-emission nozzles during the whole assembly of the gas turbine is ensured.

The dual fuel control system of the embodiment is provided with a gas fuel emptying valve and a liquid fuel discharging valve so as to discharge unused gas fuel and abandoned liquid fuel in the pipeline and ensure the running safety of the unit.

The one-way check valve is arranged on the pipeline of the dual-fuel control system in the embodiment, so that high pressure suddenly generated in the downstream is prevented, and fuel is enabled to flow back to the upstream pipeline, so that the operation safety of the fuel system and the unit is ensured.

The dual fuel control system of the embodiment is provided with a water bath heater for gas fuel, so that the fuel is prevented from reaching dew point temperature due to sudden drop of fuel temperature caused by depressurization, and pipelines and valves are prevented from icing, and the working stability of the fuel system is ensured.

In the dual fuel control system of the embodiment, 8 flow paths (the 8 flow paths are respectively a liquid fuel path, a gas fuel path 1 st branch and a gas fuel path 2 nd branch of the gas fuel system, a liquid fuel blowing path and an auxiliary atomization air blowing path of the liquid fuel blowing system, an auxiliary atomization air path of the auxiliary atomization air system, a gas fuel path 1 st branch blowing path and a gas fuel path 2 nd branch blowing path of the gas fuel blowing system) are respectively and optionally provided with flow sensors so as to effectively monitor the actual flow of a medium, and the opening control of corresponding regulating valves is facilitated, so that the stable operation of the gas turbine generator set is ensured.

The liquid fuel of the present embodiment includes, but is not limited to, light diesel, and the gaseous fuel includes, but is not limited to, natural gas.

Fifteen embodiments of the present embodiment will be described with reference to fig. 1, in which the liquid fuel system a of the present embodiment includes a liquid fuel source A1, a liquid fuel line A0, a pump A2, a first filter A3, a first regulator valve A4, a first shutoff valve A5, a first flow rate sensor A6, a relief valve A7, and a first check valve A8, one end of the liquid fuel line A0 is connected to the liquid fuel source A1, and the other end of the liquid fuel line A0 is connected in series with the pump A2, the first filter A3, the first regulator valve A4, the first shutoff valve A5, the first flow rate sensor A6, and the first check valve A8 in this order, and then is connected to the liquid fuel collars 1 to 9H, and the relief valve A7 is connected in parallel to the liquid fuel line A0 between the first flow rate sensor A6 and the first check valve A8.

The arrangement is convenient for providing liquid fuel for the combustion chamber, and simultaneously, the switching of the liquid fuel and the gas fuel is also convenient. Other compositions and connection modes are the same as those of any one of the first to fourteenth embodiments.

In sixteenth embodiment, the gas fuel system B of the present embodiment includes a gas fuel source B1, a gas fuel line B0, a water bath heater B2, a second filter B3, a second shut-off valve B5, an evacuation valve B7, a second regulator valve B4-1, a third regulator valve B4-2, a third shut-off valve B5-1, a fourth shut-off valve B5-2, a second flow sensor B6-1, a third flow sensor B6-2, a second check valve B8-1, and a third check valve B8-2,

One end of a gas fuel path B0 is connected with a gas fuel source B1, the other end of the gas fuel path B0 is sequentially connected with a water bath heater B2, a second filter B3 and a second cut-off valve B5 in series and then is divided into a gas fuel 1 st branch B0-1 and a gas fuel 2 nd branch B0-2, the gas fuel 1 st branch B0-1 is sequentially connected with a second regulating valve B4-1, a third cut-off valve B5-1, a second flow sensor B6-1 and a second check valve B8-1 in series and then is connected with a gas fuel one-way loop pipe 2-1H, and the gas fuel 2 nd branch B0-2 is sequentially connected with a third regulating valve B4-2, a fourth cut-off valve B5-2, a third flow sensor B6-2 and a third check valve B8-2 in series and then is connected with a gas fuel two-way loop pipe 3-1H. The gas fuel is convenient to provide for the combustion chamber, and meanwhile, the liquid fuel and the gas fuel are convenient to switch. Other compositions and connection modes are the same as those of any one of the first to fifteen embodiments.

Seventeenth embodiment the auxiliary atomizing air system E of the present embodiment is described with reference to fig. 1 as including a compressed air source E1, an auxiliary atomizing air path E0, an orifice plate E2, a fifth shut-off valve E5, an eighth flow rate sensor E6 and an eighth check valve E8,

One end of the auxiliary atomizing air path E0 is connected with a compressed air source E1, and the other end of the auxiliary atomizing air path E0 is connected with an orifice plate E2, a fifth cut-off valve E5, an eighth flow sensor E6 and an eighth check valve E8 in sequence and then connected with an auxiliary atomizing air loop pipe 4-1H. So set up, be convenient for provide the atomizing for liquid fuel, guarantee combustion effect. Other compositions and connection modes are the same as those of any one of the first to sixteen embodiments.

The liquid fuel purge system C of the present embodiment includes a combustion chamber bleed air path CD0, a liquid fuel purge path C0-1, an atomizing air purge path C0-2, a fourth regulator valve C4-1, a fifth regulator valve C4-2, a fourth flow sensor C6-1, a fifth flow sensor C6-2, a fourth check valve C8-1, and a fifth check valve C8-2;

The liquid fuel blowing and sweeping path C0-1 and the atomization air blowing and sweeping path C0-2 are connected in parallel and share a combustion chamber air guide path CD0, a fourth regulating valve C4-1, a fourth flow sensor C6-1 and a fourth check valve C8-1 are sequentially connected in series on the liquid fuel blowing and sweeping path C0-1 and then connected with a liquid fuel pipeline A0, and a fifth regulating valve C4-2, a fifth flow sensor C6-2 and a fifth check valve C8-2 are sequentially connected in series on the atomization air blowing and sweeping path C0-2 and then connected with an auxiliary atomization air path E0. So set up, be convenient for when adopting gaseous fuel, sweep liquid fuel, prevent carbon deposit. Other compositions and connection modes are the same as those of the first to seventeen embodiments.

Nineteenth embodiment description of the inventionreferring to fig. 1, the gas fuel purge system D of the present embodiment includes a branch purge path 1 of a gas fuel flow path D0-1, a branch purge path 2 of the gas fuel flow path D0-2, a sixth regulator valve D4-1, a seventh regulator valve D4-2, a sixth flow sensor D6-1, a seventh flow sensor D6-2, a sixth check valve D8-1, and a seventh check valve D8-2,

The branch blowing and sweeping path D0-1 of the gas fuel flow path 1 and the branch blowing and sweeping path D0-2 of the gas fuel flow path 2 are connected in parallel and share the combustion chamber air guide path CD0, the branch blowing and sweeping path D0-1 of the gas fuel flow path 1 is sequentially connected with the branch B0-1 of the gas fuel after being connected with a sixth regulating valve D4-1, a sixth flow sensor D6-1 and a sixth check valve D8-1 in series, and the branch blowing and sweeping path D0-2 of the gas fuel flow path 2 is sequentially connected with the branch B0-2 of the gas fuel after being connected with a seventh regulating valve D4-2, a seventh flow sensor D6-2 and a seventh check valve D8-2 in series. The arrangement is convenient for carrying out gas path purging when fuel is switched. Other compositions and connection modes are the same as those in any one of the first to eighteen embodiments.

The working principle of the present invention is explained with reference to fig. 1 to 6:

As shown in fig. 1, the gas turbine main body is composed of a compressor 7, a combustion chamber 8, a low-emission dual-fuel control system and a turbine 9, and a generator 10 is driven to generate electricity to form a gas turbine generator set. The head position of the combustion chamber 8 is provided with a loop pipe which facilitates fuel distribution work, such as a low-emission nozzle loop pipe system F in a partial enlarged view G, and specifically comprises a liquid fuel loop pipe 1-9H, an auxiliary atomization air loop pipe 4-1H, a gas fuel 1-path loop pipe 2-1H and a gas fuel 2-path loop pipe 3-1H which are respectively connected with a corresponding liquid fuel path inlet pipe 1-9, an auxiliary atomization air inlet 4-1, a gas fuel I path inlet 2-1 and a gas fuel II path inlet 3-1 of a low-emission nozzle 11 through branch pipes (G view).

The liquid fuel system A is connected with liquid fuel annular pipes 1-9H through a liquid fuel flow path A0, and the connection point is positioned on the lower semi-ring of the annular pipe; the gas fuel system B is divided into a gas fuel 1 st branch B0-1 and a gas fuel 2 nd branch B0-2 through a gas fuel flow path B0, and is respectively connected with a gas fuel 1 second loop pipe 2-1H and a gas fuel 2 second loop pipe 3-1H, the two branches share a gas fuel source B1, a water bath heater B2, a filter B3, a cut-off valve B5 and an emptying valve B7, and meanwhile, a regulating valve, a cut-off valve, a flowmeter and a check valve are independently designed, an auxiliary atomizing air system E is connected with the auxiliary atomizing air loop pipe 4-1H through an auxiliary atomizing air flow path E0, liquid fuel is mainly subjected to droplet breaking, combustion enhancement and efficiency improvement, a liquid fuel purging system C is divided into two flow paths, namely a liquid fuel purging path C0-1 and an atomizing air purging path C0-2, and is respectively connected with the downstream of the liquid fuel flow path A0 and the auxiliary atomizing air flow paths E0, so that the liquid fuel path and the internal channels of a low-emission nozzle in a non-working state are cleaned to prevent carbon deposition and atomization, the gas fuel system D is divided into the two branch flow paths 1, namely the liquid fuel flow path D1 and the branch flow path D2 and the low-emission nozzle in a non-working state, and the internal combustion purging channel is simultaneously prevented from being purged by the purging the liquid fuel purging system D and the two branch flow paths 2. In addition, the liquid fuel system A, the gas fuel system B and the auxiliary atomizing air system E all have independent medium sources, namely a liquid fuel source A1, a gas fuel source B1 and a compressed air source E1, while the purge gas of the liquid fuel purge system C and the gas fuel purge system D is derived from high-pressure air in an annular cavity 8A of the combustion chamber B and is supplied to the purge systems C and D through a combustion chamber bleed air flow path CD0, wherein a combustion chamber bleed air point is positioned on the outer wall surface of a combustion chamber casing. The 5 systems in the invention are all in independent modularized design, can be singly pried for convenient transportation and installation, and are particularly suitable for places with limited space such as offshore platforms.

As shown in fig. 1, in view G, the low emission dual fuel combustor 8 is composed of a combustor casing 8-1, a combustor inner casing 8-2, a front bearing housing 8-4, a rear support housing 8-5, a low emission dual fuel low emission nozzle 11, a liner 8-3, a diffuser 8-6, and a positioner 8-7. The low-emission dual-fuel low-emission nozzle 11 penetrates through a mounting hole of the front annular conical surface of the front bearing shell 8-4, is inserted into a head insertion hole of the flame tube 8-3, and is fixed and sealed through a low-emission nozzle mounting flange; the flame tube 8-3 is of a cylindrical structure, a crossfire tube, a main combustion hole 8-3A and a gas film cooling hole are arranged on the middle tube, wherein the main combustion hole provides air for supplementing and mixing with fuel on one hand, reduces the temperature of a main combustion area, enhances the emission reduction effect, adjusts the temperature distribution uniformity of an outlet of a combustion chamber on the other hand, and improves the overall overhaul period of the unit; the head of the flame tube 8-3 is provided with a mounting seat at the tail of a low-emission nozzle plugging mounting hole, the flame tube is connected with two positioners 8-7 through the head and is supported and fixed by a mounting seat at one position of the tail to provide a stable and efficient high-temperature flame working space, the combustion chamber outer shell 8-1 is respectively connected with the front bearing shell 8-4 and the rear supporting shell 8-5 through a front annular flange to ensure sealing, the combustion chamber inner shell 8-2 is connected with the front bearing shell 8-4 through the front annular flange to form a three-dimensional annular working space 8A together with the combustion chamber outer shell 8-1, namely a high-temperature and high-pressure air through-flow annular cavity, the diffuser 8-6 is connected to the rear part of the combustion chamber inner shell 8-2 to provide a high-temperature and high-pressure air inlet channel of the combustion chamber, and the combustion chamber rear supporting shell 8-5 is used for providing a mounting seat for mounting the flame tube and a high-temperature combustion chamber outlet 8-5A to enable high-temperature gas to impact to working blades of the turbine 9.

When the combustion chamber works, high-temperature and high-pressure air from the air compressor 7 enters the diffuser 8-6 from the inlet 8-6A of the combustion chamber to be subjected to speed reduction and diffusion and then flows into the annular cavity 8A of the combustion chamber, then the air is distributed to the primary air swirler of the low-emission dual-fuel low-emission nozzle 11, the secondary air swirler, the main combustion hole of the flame tube 8-3, the air film cooling hole and the like, the primary air swirler is mixed with liquid fuel or gas fuel to form a combustible mixture, the liquid fuel or gas fuel is efficiently and stably combusted in the flame tube 8-3, the secondary combustion air is formed to further reduce emission, the cooling air protects the flame tube 8-3 from exceeding the temperature tolerance limit, and finally formed high-temperature fuel gas is discharged from the outlet 8-5A of the combustion chamber to push the turbine 9 to output work so as to generate power.

When the combustion chamber 8 works by using gas fuel, the gas fuel and air are uniformly mixed in a two-stage lean combustion premixing mode, wherein the air quantity ratio of the first-stage air cyclone to the second-stage air cyclone is 1:7, the air quantity ratio is matched with the fuel fed by the 1 st gas fuel path and the 2 nd gas fuel path, the total equivalent ratio of the two-stage combustion zone is controlled to be in a low-emission zone of 2.5-4.5, the temperature of the combustion zone is further ensured to be in a low-emission combustion temperature control zone of 1700-1900 ℃, and the NOx emission value is controlled to be in a low-emission range while the efficient stable combustion chamber is realized.

As shown in fig. 2, the liquid fuel swirler 1-1 is mounted in the inner cavity of the atomizing air swirler 1-2 in a plugging manner, and forms a liquid fuel passage together with the inner wall surface of the liquid fuel swirler, and the screw plug 1-4 is fixed with the atomizing air swirler 1-2 in a threaded connection manner, so that the liquid fuel swirler 1-1 is compressed and fixed in an extrusion manner, thereby ensuring good sealing performance and mounting concentricity. The atomizing air cyclone 1-2 is also arranged in the inner cavity of the cap cover 1-3 in a plugging manner, and is simultaneously plugged and assembled with the shell 5-1. The cock 1-14 is fixed with the housing 5-1 by a threaded connection manner and rotationally applies a rated torque, so that the circular ring 1-15 and the sealing ring 1-16 squeeze the sealing cover 1-17 to ensure the sealing between the housing 5-1 and the cock 1-14 and fix the atomizing air swirler 1-2.

(1) When working with liquid fuel, the liquid fuel in the liquid fuel source A1 is pressurized by the pump A2, filtered and decontaminated by the first filter A3, transported to the liquid fuel loop pipes 1-9H under the condition of metering by the first flow sensor A6 through the first regulating valve A4 with proper opening degree and the first cut-off valve A5 with complete opening degree, finally fed to the low discharge nozzle 11 through the branch pipe, and the relief valve A7 keeps the closed state in the process (figure 1). Liquid fuel is filtered by the liquid fuel inlet pipe 1-9 through the liquid fuel filtering component 1-12 and enters the liquid fuel heat insulation pipe 1-13, then flows through a channel formed by the sealing cover 1-17 and the screw plug 1-4 to the liquid fuel cyclone 1-1 to reach a cyclone state, finally is sprayed by a liquid fuel nozzle in the inner cavity of the atomizing air cyclone 1-2 to form an atomizing cone, and enters the combustion space to be mixed with compressed air for combustion. In the process, the gas fuel purging system D is in a through-flow opening state, the sixth regulating valve D4-1 and the seventh regulating valve D4-2 are in proper opening degrees to control the purging gas amount (figure 1), compressed air is supplied to the gas fuel I path inlet 2-1 (refer to the gas fuel first inlet pipe 2-1) and the gas fuel II path inlet 3-1 (refer to the gas fuel second inlet pipe 3-1) to purge and cool the gas fuel channel, and high-temperature fuel gas is prevented from flowing backwards when the low-emission nozzle works. According to the difference of the gas turbine service condition, the auxiliary atomizing air path has two different working states.

(2) When the gas turbine is operated under low working conditions by using liquid fuel, when the gas turbine is operated under ignition conditions and slow-speed vehicles Kuang Yun, auxiliary atomizing air from the air compressor, namely part of air in the compressed air source E1, is adjusted to proper flow through the throttle orifice E2, and enters the auxiliary atomizing air ring pipe 4-1H and the branch pipe through the eighth flow sensor E6 and the eighth check valve E8 under the state that the fifth cut-off valve E5 is completely opened, and finally is supplied to an atomizing air channel of the low-emission nozzle 11. Namely, the atomized air is actively supplied by an atomized air inlet 4-1, the atomized air interface is connected with an atomized air connecting screw cap 4-2 and an atomized air connecting conical surface 4-3 in a sealing way, enters an auxiliary atomized air channel 1-5, and then reaches a swirling flow state through a swirling flow channel space and a swirling flow groove formed by a low-emission nozzle shell 5-1, an atomized air swirler 1-2 and a cap cover 1-3, finally, the liquid fuel is discharged through the rotary jet flow of an atomizing air nozzle formed by the atomizing air swirler 1-2 and the cap cover 1-3, the liquid fuel atomizing cone liquid film is subjected to rotary shearing to assist in crushing liquid drops, a good atomizing effect is achieved, and the problem of poor atomizing quality of the liquid fuel during the operation of a gas turbine under the slow-running working condition and the ignition working condition is solved.

(3) When the gas turbine is operated with liquid fuel at high working conditions, and above the slow vehicle working conditions, the auxiliary atomizing air system E closes the cut-off valve E5 at the moment of arrival of the slow vehicle working conditions, the external auxiliary atomizing air supply is stopped, the atomizing air supply of the atomizing air ring pipe 4-1H, the branch pipe and the atomizing air channel of the low-emission nozzle is regulated to be supplied by an atomizing air blowing path C0-2 of the atomizing air blowing system C, and the regulating valve C4-2 is opened to a proper opening degree. The auxiliary atomization air source is supplied by compressed air in an annular cavity space formed by the combustion chamber shell of the gas turbine and the flame tube of the combustion chamber, and the air compressor can stop working at the moment and only uses high-pressure air brought by rotary compression of the gas turbine compressor to carry out auxiliary atomization.

(4) When the gas turbine is in low working condition, the gas fuel system B is in working condition when the gas turbine is in ignition condition and slow vehicle driver Kuang Yun, the gas fuel in the gas fuel source B1 is filtered and filtered by the third cut-off valve B5-1 and the second filter B3 which are fully opened, and then heated by the water bath heater B2 to be heated and enter the gas fuel branch 1B 0-1, at the moment, the third regulating valve B4-2 and the fourth cut-off valve B5-2 of the branch 2 of the gas fuel flow path are kept in a fully closed state, and the gas fuel is conveyed to the loop 2-1H under the metering condition of the flow sensor B6-2 through the branch pipe, and finally fed to the low discharge nozzle 11, and the emptying valve B7 is kept in a closed state in the process. (figure 1) gas fuel is fed from a gas fuel I-way inlet 2-1, the gas fuel I-way interface is connected with a gas fuel I-way connecting screw cap 2-2 and a gas fuel I-way connecting taper pipe 2-3 in a sealing way, the gas fuel is conveyed to fuel small holes in a first air cyclone 2-5 after a fuel channel is formed by a low-emission nozzle shell 5-1 and a bow clamp 2-4 through holes in the low-emission nozzle shell 5-1 and is sprayed out, and the gas fuel is mixed with air and then enters a combustion space for premixed combustion, so that pollutant emission is effectively reduced. In this process, the branch 2 purge path D0-2 of the gas fuel flow path of the gas fuel purge system D is in a through-flow open state, and the third regulating valve B4-2 is in a proper opening degree to control the purge gas amount to the gas fuel 2 loop pipe 3-1H (fig. 1), and further enters the gas fuel II path inlet 3-1 of the low emission nozzle 11. Similarly, the liquid fuel purging system C is in a purging working state, the atomization air inlet 4-1 and the liquid fuel path inlet 1-9 are respectively supplied with compressed air in an annular cavity space formed by the gas turbine combustion chamber shell and the combustion chamber flame tube, so that each channel is purged and cooled, and high-temperature fuel gas is prevented from flowing backwards when the low-emission nozzle works. Optionally, the liquid fuel purge path C0-1 and the atomizing air purge path C0-2 include fourth and fifth regulating valves C4-1 and C4-2 that control the flow rate, and fourth and fifth flow sensors C6-1 and C6-2 that meter the actual purge flow rate. Meanwhile, the eighth check valve E8 and the first check valve A8 can prevent purge gas from flowing backward to the auxiliary atomizing air system E and the liquid fuel system a, damaging the apparatus.

(5) When the gas turbine is operated under the high working condition and above the slow working condition, the gas fuel supply quantity is large, when the gas turbine reaches the slow point, the gas fuel 2 branch pipe is adjusted to be in a fuel supply state from a purging state, namely the seventh regulating valve D4-2 is adjusted to be closed from an opening state, meanwhile the seventh regulating valve D4-2 is adjusted to be in a proper opening degree, the fourth cutting valve B5-2 is adjusted to be fully opened, two branches of the gas fuel system B are in a fuel supply working state, specifically, the gas fuel in the gas fuel source B1 is filtered and filtered by the second cutting valve B5 and the second filter B3 which are fully opened, then heated by the water bath heater B2 and enters the gas fuel 1 branch B0-1 and the gas fuel 2 branch B0-2 of the gas fuel flow path at the moment, the gas fuel is fed to the gas fuel 2 branch pipe 1H and the gas fuel 3-1H of the gas fuel branch pipe under the metering condition of the respective flow sensor through the proper opening degree and the cutting valve, and finally the gas fuel branch pipe 3-1H of the gas fuel in the gas fuel pipe is fed into the low fuel pipe through the branch pipe 11, and the gas fuel pipe is kept in a closed state in the low nozzle B7. When the working condition continues to rise, the opening degree of the second regulating valve B4-1 and the opening degree of the third regulating valve B4-2 are controlled. At this time, the gas fuel is supplied from the gas fuel I-path inlet 2-1 and the gas fuel I-path inlet 3-1 at the same time, and the gas fuel II-path interface is hermetically connected with the gas fuel I-path through the gas fuel II-path connecting screw cap 3-2 and the gas fuel II-path connecting taper pipe 3-3, and the gas fuel is delivered to the fuel small holes in the II-stage cyclone 2-9 through the holes in the housing 5-1 and the I-th air cyclone 2-5, is sprayed out after entering the fuel small holes in the II-stage cyclone 2-9 and being mixed with the air, enters the combustion space, and is premixed-combusted together with the gas fuel I-path. In the process, the liquid fuel purging system C is in a purging working state as the working state of the gas turbine under the low working condition of using gas fuel, the atomized air inlet 4-1 and the liquid fuel path inlet 1-9 are supplied by compressed air in an annular cavity space formed by a combustion chamber shell and a combustion chamber flame tube of the gas turbine, purging and cooling are carried out on each channel, and high-temperature gas backflow is prevented when the low-emission nozzle works.

(6) The process of switching from gaseous fuel to liquid fuel at a certain operating condition is optionally performed according to the following steps:

① Before the switching starts, the gas fuel system B keeps an operating state, namely, gas fuel is supplied to a gas fuel one-way annular pipe 2-1H and a gas fuel 2-way annular pipe by a gas fuel 1 st branch B0-1 and a gas fuel 2 nd branch B0-2 and enters a gas low-emission nozzle 11 for combustion, the liquid fuel purging system C keeps an operating state, namely, bleed air from a combustion chamber 8 enters a liquid fuel purging flow path C0-1 and an atomization air purging path C0-2 through a flow path CD0 and respectively enters a liquid fuel annular pipe 1-9H and an auxiliary air ring 4-1H, and the liquid fuel system A, the gas fuel purging system D and the auxiliary atomization air system E effectively purge a liquid fuel channel and an auxiliary atomization air channel of the low-emission nozzle 11 to prevent carbon deposition, and the sixth check valve D8-1 and the seventh check valve D8-2 through respective first check valves A8 and the eighth check valve E8 effectively purge the bleed air and the gas fuel of the combustion chamber 8 to prevent the gas turbine from being polluted;

② When the switching starts, on the basis of the state of the step ①, the liquid fuel purging flow path C0-1 of the liquid fuel purging system C stops working, namely the fourth regulating valve C4-1 is regulated to be in a closed state, the liquid fuel system A starts working, the pump A2 is started, the first cut-off valve A5 is opened, the first regulating valve A4 is regulated to the minimum opening degree of the valve, the working medium in the liquid fuel loop 1-9H is converted from the air entraining of the combustion chamber 8 into the liquid fuel with the proper flow Gl fed by the liquid fuel flow path A0, and finally enters the liquid fuel channel of the low emission nozzle 11, enters the combustion chamber to participate in combustion under the auxiliary atomization effect of purge gas under the air entraining condition of the combustion chamber 8, and meanwhile, in order to ensure that the power fluctuation of the gas turbine generator set is within 5%, the second regulating valve B4-1 and the third regulating valve B4-2 of the gas fuel system reduce certain opening degree to reduce the heating value so as to reduce the gas fuel quantity Gg corresponding to Gl; the opening degree of the first cut-off valve A5 is gradually increased along with the advance of the fuel switching process, the opening degree of the third cut-off valve B5-1 and the fourth cut-off valve B5-2 is gradually reduced, the power fluctuation of the gas turbine generator set is ensured to be within 5 percent in the process, when a certain moment is reached, the second regulating valve B4-1 and the third regulating valve B4-2 are completely closed, simultaneously the third cut-off valve B5-1 and the fourth cut-off valve B5-2 are simultaneously adjusted to be in a closed state, the effective cut-off of the gas fuel is ensured, the first cut-off valve A5 is adjusted to be at a proper opening degree, the fuel switching is completed, and continuous power output is ensured in the maintenance of the working state of the gas turbine generator set, the generator 10 is always in a stable operating state.

③ After the switching is finished, on the basis of the step ②, the liquid fuel system a is kept in a working state, the gas system B is in a closed state, the second cut-off valve B5, the third cut-off valve B5-1 and the fourth cut-off valve B5-2 are kept closed, the gas purging system D starts to work, namely the sixth regulating valve D4-1 and the seventh regulating valve D4-2 are opened to proper opening degrees, the bleed air of the combustion chamber 8 is respectively introduced into the gas fuel 1 loop 2-1H and the gas fuel 2 loop to purge and clean two gas fuel channels of the low emission nozzle 11, carbon deposition and backfire are prevented, and meanwhile, the second check valve B8-1 and the third check valve B8-2 of the gas fuel flow path 1 branch and the gas fuel flow path 2 of the gas fuel system B can effectively prevent purge air from flowing backward into the gas fuel system B, flammable mixtures are generated, and the gas fuel is influenced to be put into use again. In addition, the evacuation valve B7 of the gas fuel system B is optionally opened, residual gas fuel in the gas fuel flow path is safely evacuated through the evacuation port, flammable mixtures are prevented from being formed, the safety of the unit is ensured, and the evacuation valve B7 is adjusted to be closed after evacuation to restore the system standby state.

(7) The process of switching from liquid fuel to gaseous fuel at a certain operating condition is optionally performed according to the following steps:

① Before the switching starts, the liquid fuel system A keeps an operating state, namely, liquid fuel is supplied to the liquid fuel loop 1-9H through the liquid fuel flow path A0, finally, the liquid fuel channel entering the low emission nozzle 11 sprays, atomizes and burns, the gas fuel system B is in a closed state, the gas fuel purging system D is in an operating state, namely, the sixth regulating valve D4-1 and the seventh regulating valve D4-2 are opened to proper opening degrees, the bleed air of the combustion chamber 8 is respectively introduced into the gas fuel one-way loop 2-1H and the gas fuel 2-way loop through the gas fuel flow path 1 st branch purging path D0-1 and the gas fuel 2-way loop to purge and clean two gas fuel channels of the low emission nozzle 11, carbon deposition and backfire are prevented, meanwhile, the second check valve B8-1 and the third check valve B8-2 of the gas fuel flow path 1 st branch path and the gas fuel flow path 2 branch path can effectively prevent the purge air from flowing back to the inside of the gas fuel system B to generate inflammable fuel mixture, and flammable fuel is influenced to operate again. The liquid fuel purging system C keeps a semi-working state, namely the liquid fuel purging flow path C0-1 is in a closed state, but the auxiliary atomizing air flow path C0-2 is in an open state, the air bleed from the combustion chamber 8 enters the atomizing air purging flow path C0-2 through the flow path CD0 and further enters the auxiliary air ring 4-1H, and finally the auxiliary atomizing air channel of the low-emission nozzle 11 is effectively purged, and the auxiliary liquid fuel is efficiently atomized after being sprayed out from the channel outlet, so that the combustion is enhanced, and the combustion efficiency is improved; the auxiliary atomizing air system E does not work, and the bleed air purge gas of the combustion chamber 8 is effectively checked through the check valve E8, so that the purge gas is prevented from flowing backwards to the auxiliary atomizing air system to damage equipment;

② When the switching starts, based on the state of step ①, the branch blowing path D0-1 of the gas fuel flow path 1 and the branch blowing path D0-2 of the gas fuel flow path 2 of the gas fuel purge system D stop working, that is, the sixth regulating valve D4-1 and the seventh regulating valve D4-2 are adjusted to be in a closed state, purging is stopped, and preparation is made for switching. Further, the second shut-off valve B5 in the gas fuel flow path B0 is opened, and the water bath heater B2 starts to heat the gas fuel supplied from the gas fuel source B1, thereby preventing the hydrocarbon separation phenomenon of the gas fuel caused by the excessively low fuel temperature. The second regulating valve B4-1 of the first branch B0-1 of the gas fuel is opened to the minimum opening, the third cut-off valve B5-is adjusted to be in an opened state, then the gas fuel is fed into the first loop pipe 2-1H of the gas fuel 1 through a flow path, the gas fuel flow is controlled to Gg, the gas fuel further enters the gas fuel 1 channel of the low emission nozzle 11 and participates in combustion, meanwhile, the opening of the first regulating valve A4 on the liquid fuel flow path A0 is reduced, so that the liquid fuel flow is reduced by Gl, and the calorific value of Gl and Gg is the same, so that the power of the gas turbine generator set is stabilized within 5%. Along with the advancing of the switching process, when the second regulating valve B4-1 is regulated to a certain opening degree, the opening degree is kept unchanged, the fourth cut-off valve B5-2 is regulated to be opened, the third regulating valve B4-2 is regulated to be the minimum opening degree, meanwhile, the first regulating valve A4 of the liquid fuel system A is continuously reduced in opening degree until being closed, the gas fuel system B is completely put into a stable working state, the fuel switching is completed, the working state of the gas turbine generator set is kept stable in the process, continuous power output exists, and the generator 10 is always in the stable working state.

③ After the switching is finished, on the basis of step ②, the liquid fuel system a is stopped, that is, the pump A2, the first regulating valve A4 and the first cut-off valve A5 are kept in a closed state, the gas fuel system B is in an opened stable running state, the liquid fuel purging system C starts to operate, that is, the fourth regulating valve C4-1 is opened to a proper opening degree, the bleed air of the combustion chamber 8 is respectively introduced into the liquid fuel ring pipes 1-9H to purge and clean the liquid fuel channel of the low discharge nozzle 11, the carbon deposition is prevented, and meanwhile, the check valve A8 on the liquid fuel flow path A0 of the liquid fuel system a can effectively prevent the purge gas from flowing backward into the liquid fuel system a to generate flammable mixtures, so that the liquid fuel is influenced to be put into use again. Further, a relief valve A7 in the liquid fuel system A is optionally opened, residual liquid fuel in a liquid fuel flow path is relieved through a relief port, the unit is regulated to be closed after safety is ensured, and the system standby state is restored.

(8) In order to prevent high-temperature carbon deposition of the dual-fuel low-emission nozzle, 3 paths of carbon deposition prevention air cooling channels are arranged, and the specific composition of the channels is as follows:

In order to reduce the temperature of the cap cover 1-3 and prevent carbon deposition, when the dual-fuel low-emission nozzle works, a plurality of holes are formed in the cyclone shell 2-10, unburned compressed air from the annular cavity between the combustion chamber shell and the flame tube flows into the low-emission nozzle from one path of carbon deposition-preventing cold-state purging holes 6-1 and flows in a cooling channel in the cap cover 1-3, and finally one path of spray nozzles 6-2 are purged from the carbon deposition-preventing cold state to be sprayed into a combustion space, so that a heat-insulating protective gas mold is formed, the temperature is reduced, and carbon deposition is prevented. In order to reduce the temperature of the premixed first path compression piece 2-6 and prevent carbon deposition, when the dual-fuel low-emission nozzle works, a plurality of holes are formed in the cyclone shell 2-10, unburned compressed air from the annular cavity between the combustion chamber shell and the flame tube flows into the low-emission nozzle through the two paths of carbon deposition-preventing cold-state purging holes 6-3, flows in the cooling channel formed by the cyclone shell 2-10, the premixed first path compression piece 2-6 and the first cup-shaped component 2-7, performs impact cooling on the premixed first path compression piece 2-6 through the multiple rows of holes on the first cup-shaped component 2-7 under the action of pressure difference, and finally, the two paths of carbon deposition-preventing cold-state purging first nozzles 6-4 and the two paths of carbon deposition-preventing cold-state purging second nozzles 6-5 are sprayed to a combustion space to form a heat insulation protection air film, so that the temperature is reduced and the carbon deposition is prevented. In order to reduce the temperature of the premixed second-path compressing element 3-6 and prevent carbon deposition, when the dual-fuel low-emission nozzle works, a plurality of holes are formed on the ferrule 3-5, the unburned compressed air from the annular cavity between the combustion chamber shell and the flame tube flows into the low-emission nozzle through the three-way cooling carbon deposition-preventing cold-state purging holes 6-6, flows in the cooling channel formed by the cyclone shell 2-10, the ferrule 3-5 and the premixed II-path compressing element 3-6, and finally is sprayed to the combustion space from a plurality of small holes on the premixed second-path compressing element 3-6 to form a heat insulation protection air film, so that the temperature is reduced and carbon deposition is prevented.

While only the preferred embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, and various modifications and equivalent substitutions for the features and embodiments of the present invention may be made by those skilled in the art without departing from the spirit of the invention and the scope of the appended claims without departing from the spirit of the invention.

Claims (19)

1. The low-emission nozzle is characterized by comprising a first fuel gas path, a second fuel gas path, an atomization air path, a liquid fuel path, a purging air path and a nozzle body;

The first fuel gas circuit, the second fuel gas circuit, the atomizing air circuit and the liquid fuel circuit are arranged on the nozzle body in a mode of inner oil, outer gas and staggered oil ways and gas ways, wherein the atomizing air circuit, the first fuel gas circuit and the liquid fuel circuit ensure that a unit enters a slow car working condition and shares a first air cyclone (2-5) of the first fuel gas circuit, the atomizing air circuit, the second fuel gas circuit and the liquid fuel circuit ensure that the unit enters a fast car working condition and shares a second air cyclone (2-9) of the second fuel gas circuit, the purge air circuit is arranged on the fuel ejection side of the nozzle body, and the purge air circuit adopts the modes of impact convection cooling, air film cooling and heat insulation cooling to prevent carbon deposition on a nozzle;

The purging air path comprises an impact convection cooling air path, a gas film cooling air path and a heat insulation cooling air path, wherein:

The impact convection cooling air path is that a plurality of two-way carbon deposition prevention cold state purging holes (6-3) are formed in a second-way cyclone shell (2-10), external cold air flows in from the two-way carbon deposition prevention cold state purging holes (6-3), flows in an internal cooling channel formed by the second-way cyclone shell (2-10), the premixing first-way compression piece (2-6) and the first cup-shaped component (2-7), and performs impact cooling on the premixing first-way compression piece (2-6) through a plurality of rows of holes on the first cup-shaped component (2-7) under the action of air pressure difference;

The air film cooling air path is that a plurality of carbon deposition prevention cold state blowing holes (6-1) are formed in a first air cyclone (2-5), cold air of an external blowing system enters from the carbon deposition prevention cold state blowing holes (6-1), flows in a cooling channel in a cap cover (1-3), and finally is sprayed to a combustion space from a carbon deposition prevention cold state blowing nozzle (6-2) to form a heat insulation protection air film, so that the temperature of the cap cover (1-3) is reduced;

the heat-insulating cooling air path is characterized in that a plurality of three-way cooling carbon deposition preventing cold state purging holes (6-6) are formed in the ferrule (3-5), cold air of the external purging system enters the second path of cyclone shell (2-10) from the three-way cooling carbon deposition preventing cold state purging holes (6-6), flows in an internal cooling channel formed by the ferrule (3-5) and the premixed second path of compacting piece (3-6), and finally is sprayed to a combustion space from the holes on the premixed second path of compacting piece (3-6) to form a heat-insulating protection air film, so that the temperature of the premixed second path of compacting piece (3-6) is reduced.

2. A low-emission nozzle as claimed in claim 1, wherein the nozzle body comprises a low-emission nozzle housing (5-1) and a combustion chamber cover plate (5-2), the combustion chamber cover plate (5-2) being mounted on the fuel inlet of the low-emission nozzle housing (5-1).

3. A low emission nozzle as claimed in claim 2, wherein the liquid fuel circuit comprises a liquid fuel swirler (1-1), a screw plug (1-4), a sealing cap (1-17), a sealing assembly, a tap (1-14), a liquid fuel heat-insulating pipe (1-13), a liquid fuel circuit inlet pipe (1-9), a liquid fuel circuit coupling cap (1-10), a liquid fuel circuit coupling cone (1-11) and a liquid fuel filter assembly (1-12), the liquid fuel circuit coupling cone (1-11) is inserted on a combustion chamber cover plate (5-2), the liquid fuel filter assembly (1-12) is mounted in the liquid fuel circuit coupling cone (1-11), the liquid fuel circuit inlet pipe (1-9) is mounted on the liquid fuel circuit coupling cone (1-11) through the liquid fuel circuit coupling cap (1-10), the liquid fuel swirler (1-1) and the screw plug (1-4) are coaxially mounted in the low emission nozzle housing (5-1), the sealing cap (1-17) is screwed on the screw plug (1-17) through the sealing assembly (1-4), and two ends of the liquid fuel heat insulation pipe (1-13) are respectively communicated with the liquid fuel cyclone (1-1) and the liquid fuel path connecting taper pipe (1-11).

4. A low-emission nozzle as defined in claim 3, wherein the sealing assembly comprises a circular ring (1-15), a sealing ring (1-16) and a steel ring (1-18), the sealing ring (1-16) is an annular sealing ring, a tapered stepped groove (1-16-1) is formed in the upper portion of the sealing ring (1-16), the steel ring (1-18) is embedded in the sealing ring (1-16) in a sealing manner, the outer side face of the lower portion of the circular ring (1-15) is in a tapered stepped shape, the circular ring (1-15) is inserted in the stepped groove (1-16-1) of the sealing ring (1-16), and the upper end face of the circular ring (1-15) is lower than the upper end face of the sealing ring (1-16).

5. A low emission nozzle as claimed in claim 1,2, 3 or 4, wherein the atomizing air path further comprises an atomizing air cyclone (1-2), an auxiliary atomizing air path inlet pipe (1-6), an auxiliary atomizing air path connecting cap (1-7) and an auxiliary atomizing air path taper pipe (1-8), the atomizing air cyclone (1-2) is sleeved on the liquid fuel cyclone (1-1) and the screw plug (1-4), the cap (1-3) is sleeved on the atomizing air cyclone (1-2) and is positioned on one side of the liquid fuel cyclone (1-1), the auxiliary atomizing air path inlet pipe (1-6) is arranged on the combustion chamber cover plate (5-2), the auxiliary atomizing air path inlet pipe (1-6) is connected with the auxiliary atomizing air path taper pipe (1-8) through the auxiliary atomizing air path connecting cap (1-7), and the bottom of the auxiliary atomizing air path taper pipe (1-8) is communicated with the atomizing air cyclone (1-2) through the auxiliary atomizing air passage (1-5).

6. A low emission nozzle as defined in claim 5, wherein said first fuel circuit further comprises a gas fuel first inlet tube (2-1), a gas fuel first coupling cap (2-2), a gas fuel first coupling cone (2-3), a clip (2-4) and a second cup assembly (2-8);

The gas fuel first connecting taper pipe (2-3) is arranged on the combustion chamber cover plate (5-2), the gas fuel first inlet pipe (2-1) is arranged on the gas fuel first connecting taper pipe (2-3) through the gas fuel first connecting cap cover (2-2), the arch clamp (2-4) is arranged at the fuel spraying side end part of the low emission nozzle shell (5-1), the first air cyclone (2-5) is arranged at the rear end of the arch clamp (2-4), the premixing first air compressing piece (2-6) and the first air cyclone (2-5) are coaxially inserted at the tail part of the first air cyclone (2-5), the first cup-shaped component (2-7) and the second cup-shaped component (2-8) are sleeved on the premixing first air compressing piece (2-6) from inside to outside, and the bottom of the gas fuel first connecting taper pipe (2-3) is communicated with the first air cyclone (2-5) through a first air channel.

7. A low emission nozzle as claimed in claim 6, wherein the second fuel circuit further comprises a second air swirler (2-9), a gas fuel second inlet pipe (3-1), a gas fuel second coupling cap (3-2), a gas fuel second coupling cone (3-3), and a cover (3-4);

The second path of cyclone shell (2-10) is installed on the first path of air cyclone (2-5) through a sealing cover (3-4), the second path of air cyclone (2-9) is installed on the second path of cyclone shell (2-10), the premixing second path of compacting piece (3-6) is installed on the second path of cyclone shell (2-10) through a ferrule (3-5), the gas fuel second coupling taper pipe (3-3) is installed on the combustion chamber cover plate (5-2), the gas fuel second inlet pipe (3-1) is connected with the gas fuel second coupling taper pipe (3-3) through the gas fuel second coupling cap (3-2), and the gas fuel second coupling taper pipe (3-3) is communicated with the second path of air cyclone (2-9) through a second gas path channel.

8. The low emission nozzle as claimed in claim 7, wherein the cold air of the external purging system is sprayed into the combustion space at the first spray nozzle (6-4) and the second spray nozzle (6-5) of the two-way anti-carbon deposition cold state purging to form a heat-insulating protective air film, and finally the temperature of the first compacting member (2-6) is reduced in a mode of combining impact convection cooling and air film cooling.

9. The low emission nozzle as claimed in claim 8, wherein the two-way anti-carbon-deposition cold purge first nozzle (6-4) and the two-way anti-carbon-deposition cold purge second nozzle (6-5) are arranged on the pre-mixing first compacting member (2-6) in an annular array.

10. A low emission nozzle as claimed in claim 9, wherein the two-way anti-carbon deposition cold purge one nozzle (6-4) is an elliptical nozzle, and the plurality of two-way anti-carbon deposition cold purge one nozzles (6-4) are arranged in an annular array in a clockwise inclined manner.

11. A low emission nozzle as defined in claim 10, wherein said two-way anti-carbon cold purge two nozzle (6-5) is a rectangular nozzle.

12. A low-emission dual-fuel combustion chamber comprises a combustion chamber outer shell (8-1), a combustion chamber inner shell (8-2) and a flame tube (8-3), and is characterized by further comprising a front bearing shell (8-4), a rear supporting shell (8-5), a combustion chamber outlet (8-5A), a diffuser (8-6), a combustion chamber inlet (8-6A), a positioner (8-7) and the low-emission nozzle as claimed in claim 1,

The combustion chamber outer shell (8-1) is respectively connected with the front bearing shell (8-4) and the rear support shell (8-5) in a sealing way through a front annular flange and a rear annular flange, the combustion chamber inner shell (8-2) is connected with the front bearing shell (8-4) through the front annular flange and forms a three-dimensional combustion chamber annular cavity (8A) together with the combustion chamber outer shell (8-1), the diffuser (8-6) is connected to the rear part of the combustion chamber inner shell (8-2), the end part of the diffuser (8-6) is a combustion chamber inlet (8-6A), and the combustion chamber outlet (8-5A) is formed on the rear support shell (8-5);

The flame tube (8-3) is arranged in the annular cavity (8A) of the three-dimensional combustion chamber, the low-emission nozzle penetrates through the front annular conical surface mounting hole of the front bearing shell (8-4) to be inserted into the inserting hole of the head of the flame tube (8-3), the main combustion hole (8-3A) is arranged in the middle of the flame tube (8-3), the head of the flame tube (8-3) is connected with two positioners (8-7), and the tail mounting seat of the flame tube (8-3) is arranged on the rear support shell (8-5) in a three-point supporting manner.

13. A low emission dual fuel combustor as claimed in claim 12 wherein the low emission nozzle is as claimed in any one of claims 2 to 11.

14. A gas turbine generator set, characterized in that it comprises a low emission dual fuel combustion chamber (8) according to any of the claims 12-13, a low emission dual fuel control system, a compressor (7), a turbine (9) and a generator (10), the low emission dual fuel combustion (8) being connected to a low emission nozzle collar system (F) of the low emission dual fuel control system,

High-temperature and high-pressure air from the air compressor (7) enters a diffuser (8-6) from a combustion chamber inlet (8-6A) to be subjected to speed reduction and diffusion and then flows into a combustion chamber annular cavity (8A), then the air is distributed into a low-emission nozzle (11) to be mixed with liquid fuel or gas fuel to form a combustible mixture, the combustible mixture is efficiently and stably combusted in a flame tube (8-3), and the combustible mixture is discharged from a combustion chamber outlet (8-5A) to push a turbine (9) to output work so as to realize power generation of a generator (10);

The low-emission dual-fuel control system comprises a liquid fuel system (A), a gas fuel system (B), a liquid fuel purging system (C), a gas fuel purging system (D), an auxiliary atomizing air system (E) and a low-emission nozzle loop system (F);

The low-emission nozzle loop system (F) comprises a liquid fuel loop (1-9H), an auxiliary atomization air loop (4-1H), a gas fuel loop (2-1H) and a gas fuel two-way loop (3-1H), wherein the liquid fuel loop (1-9H), the auxiliary atomization air loop (4-1H), the gas fuel loop (2-1H) and the gas fuel two-way loop (3-1H) are respectively connected with a liquid fuel path inlet pipe (1-9), an auxiliary atomization air path inlet pipe (1-6), a gas fuel first inlet pipe (2-1) and a gas fuel second inlet pipe (3-1) on a low-emission nozzle through branch pipes;

when burning liquid fuel:

When the ignition working condition and the slow vehicle working condition are lower than the ignition working condition, the liquid fuel system (A) is put into operation, the gas fuel system (B) is not operated, the liquid fuel purging system (C) is not operated, the gas fuel purging system (D) is put into operation, the auxiliary atomizing air system (E) is put into operation,

At this point, the liquid fuel system (A) enters the liquid fuel loop (1-9H) of the low-emission nozzle loop system (F) through the liquid fuel flow path (A0) and then enters the liquid fuel path of the low-emission nozzle;

the auxiliary atomizing air system (E) enters an auxiliary atomizing air ring pipe (4-1H) through an auxiliary atomizing air flow path (E0) and then enters an atomizing air path of the low-emission nozzle to carry out auxiliary atomization on the liquid fuel;

the gas fuel purging system (D) is divided into two flow paths, namely a gas fuel flow path 1 branch purging path (D0-1) and a gas fuel flow path 2 branch purging path (D0-2), and is used for cleaning and purging the gas fuel ring pipe and the internal channel of the low-emission nozzle in a non-working state;

When the working condition of the slow car is above, the purging air source of the atomizing air channel is regulated to be supplied by an atomizing air blowing channel (C0-2) of the liquid fuel channel purging system (C) by an auxiliary atomizing air system (E), namely, the auxiliary atomizing air source is supplied by compressed air in an annular cavity space formed by a combustion chamber shell of the low-emission dual-fuel combustion chamber and a flame tube, and the rest systems are kept unchanged;

when burning gaseous fuel:

the liquid fuel system (A) is closed, the gas fuel system (B) is put into operation, and the liquid fuel purging system (C) is put into operation;

When the ignition working condition and the slow vehicle working condition are as follows:

Compressed air in the annular cavity space of the low-emission dual-fuel combustion chamber enters a liquid fuel path (A0) of the liquid fuel system (A), a gas fuel flow path 2 nd branch blowing path (D0-2) of the gas fuel blowing system (D) and an auxiliary atomization air path (E0) of the auxiliary atomization air system (E);

The gaseous fuel enters a gaseous fuel one-way loop (2-1H) of the low emission nozzle loop system (F) through the gaseous fuel system (B) and then enters a gaseous fuel first inlet pipe (2-1) of the low emission nozzle;

the liquid fuel purging system (C) is in a purging working state, and the auxiliary atomization air channel inlet pipe (1-6) and the liquid fuel channel inlet pipe (1-9) are respectively supplied with compressed air in an annular cavity space formed by a combustion chamber shell of the low-emission dual-fuel combustion chamber and the flame tube, so as to purge and cool all channels;

above the slow vehicle working condition:

The gas fuel purging system (D) is closed, and gas fuel simultaneously enters a gas fuel one-way loop (2-1H) and a gas fuel two-way loop (3-1H) of the low-emission nozzle loop system (F) through the gas fuel system (B) and then respectively enters a first fuel gas circuit and a second fuel gas circuit of the low-emission nozzle;

when the gas fuel and the liquid fuel are combusted and switched, the liquid fuel purging system (C) and the gas fuel purging system (D) are both closed, and the liquid fuel system (A) and the gas fuel system (B) are both put into operation.

15. A gas turbine power generation assembly according to claim 14, wherein the liquid fuel system (A) comprises a liquid fuel source (A1), a liquid fuel pipeline (A0), a pump (A2), a first filter (A3), a first regulating valve (A4), a first cut-off valve (A5), a first flow sensor (A6), a relief valve (A7) and a first check valve (A8), one end of the liquid fuel pipeline (A0) is connected with the liquid fuel source (A1), the other end of the liquid fuel pipeline (A0) is connected with the pump (A2), the first filter (A3), the first regulating valve (A4), the first cut-off valve (A5), the first flow sensor (A6) and the first check valve (A8) in series and then is connected with the liquid fuel loop (1-9H), and the relief valve (A7) is connected in parallel with the liquid fuel pipeline (A0) between the first flow sensor (A6) and the first check valve (A8).

16. A gas turbine generator set as claimed in claim 14 or 15, wherein the gas fuel system (B) comprises a gas fuel source (B1), a gas fuel line (B0), a water bath heater (B2), a second filter (B3), a second shut-off valve (B5), an evacuation valve (B7), a second regulating valve (B4-1), a third regulating valve (B4-2), a third shut-off valve (B5-1), a fourth shut-off valve (B5-2), a second flow sensor (B6-1), a third flow sensor (B6-2), a second check valve (B8-1) and a third check valve (B8-2),

One end of a gas fuel path (B0) is connected with a gas fuel source (B1), the other end of the gas fuel path (B0) is sequentially connected with a water bath heater (B2), a second filter (B3) and a second cut-off valve (B5) in series and then is divided into a gas fuel 1 st branch (B0-1) and a gas fuel 2 nd branch (B0-2), the gas fuel 1 st branch (B0-1) is sequentially connected with a second regulating valve (B4-1), a third cut-off valve (B5-1), a second flow sensor (B6-1) and a second check valve (B8-1) in series and then is connected with a gas fuel one-way loop pipe (2-1H), and the gas fuel 2 nd branch (B0-2) is sequentially connected with a third regulating valve (B4-2), a fourth cut-off valve (B5-2), a third flow sensor (B6-2) and a third check valve (B8-2) in series and then is connected with a gas fuel two-way loop pipe (3-1H).

17. A gas turbine generator set as claimed in claim 16, wherein the auxiliary atomizing air system (E) comprises a compressed air source (E1), an auxiliary atomizing air path (E0), a throttle plate (E2), a fifth shut-off valve (E5), an eighth flow sensor (E6) and an eighth check valve (E8),

One end of an auxiliary atomizing air channel (E0) is connected with a compressed air source (E1), and the other end of the auxiliary atomizing air channel (E0) is connected with an orifice plate (E2), a fifth cut-off valve (E5), an eighth flow sensor (E6) and an eighth check valve (E8) in sequence and then connected with an auxiliary atomizing air ring pipe (4-1H).

18. A gas turbine generator set as set forth in claim 17, wherein the liquid fuel purge system (C) comprises a combustor bleed (CD 0), a liquid fuel purge (C0-1), an atomizing air purge (C0-2), a fourth regulator valve (C4-1), a fifth regulator valve (C4-2), a fourth flow sensor (C6-1), a fifth flow sensor (C6-2), a fourth check valve (C8-1), and a fifth check valve (C8-2);

the liquid fuel blowing and sweeping circuit (C0-1) and the atomizing air blowing and sweeping circuit (C0-2) are connected in parallel and share a combustion chamber air guiding circuit (CD 0), a fourth regulating valve (C4-1), a fourth flow sensor (C6-1) and a fourth check valve (C8-1) are sequentially connected in series on the liquid fuel blowing and sweeping circuit (C0-1) and then connected with a liquid fuel pipeline (A0), and a fifth regulating valve (C4-2), a fifth flow sensor (C6-2) and a fifth check valve (C8-2) are sequentially connected in series on the atomizing air blowing and sweeping circuit (C0-2) and then connected with an auxiliary atomizing air circuit (E0).

19. A gas turbine generator set as set forth in claim 18, wherein the gas fuel purge system (D) comprises a gas fuel flow path 1 st branch purge path (D0-1), a gas fuel flow path 2 nd branch purge path (D0-2), a sixth regulator valve (D4-1), a seventh regulator valve (D4-2), a sixth flow sensor (D6-1), a seventh flow sensor (D6-2), a sixth check valve (D8-1), and a seventh check valve (D8-2),

The gas fuel flow path 1 st branch blowing path (D0-1) and the gas fuel flow path 2 nd branch blowing path (D0-2) are connected in parallel and share a combustion chamber air guide path (CD 0), a sixth regulating valve (D4-1), a sixth flow sensor (D6-1) and a sixth check valve (D8-1) are sequentially connected in series on the gas fuel flow path 1 st branch blowing path (D0-1), and then the gas fuel flow path 1 st branch blowing path is connected with the gas fuel 1 st branch (B0-1), and a seventh regulating valve (D4-2), a seventh flow sensor (D6-2) and a seventh check valve (D8-2) are sequentially connected in series on the gas fuel flow path 2 nd branch blowing path (D0-2) and then the gas fuel 2 nd branch (B0-2).