CN105240061B - A kind of superhigh temperature Steam Power Circulation system using note hydrogen burning mixed heating - Google Patents

Abstract

An ultra-high temperature steam power cycle system using hydrogen injection combustion hybrid heating, using a two-stage hydrogen injection combustion hybrid heater to replace the power plant boiler system, using pure hydrogen as fuel and pure oxygen as a combustion aid, from the feed water preheating system High-pressure feed water is sprayed into the first-stage hydrogen-injection combustion hybrid heater to absorb the heat released by hydrogen-oxygen combustion and mix with combustion products to form high-temperature and high-pressure steam, which is then sent to the high-pressure cylinder of the steam turbine to expand and perform work, and then returns to the second-stage hydrogen injection Combustion hybrid heater, through hydrogen and oxygen combustion and mixed heating, to obtain high-temperature reheated steam, and then send the reheated steam to the middle of the steam turbine, the low-pressure cylinder continues to expand and work, and the exhaust steam of the low-pressure cylinder is sent to the condenser to condense into water and then return As for the feed water preheating system, the invention simplifies the steam system, saves high-temperature metal materials, and can increase the initial temperature of the steam to above 700°C, greatly improving the power generation efficiency of the steam power cycle.

Description

A super high temperature steam power cycle system using hydrogen injection combustion hybrid heating

technical field

The invention belongs to the technical field of steam power cycle power generation, and particularly relates to an ultra-high temperature steam power cycle system adopting hydrogen injection combustion hybrid heating.

Background technique

At present, most of the conventional thermal power units in thermal power plants adopt the steam power cycle system with reheating and reheating based on the basic principle of the Rankine cycle. The initial temperature and initial pressure of the fresh steam continue to increase, and the fresh steam pressure of the supercritical unit has reached above 26MPa. The temperature reaches 600°C, and the power generation efficiency can reach 45%, while the further developed ultra-high parameter unit hopes to increase the initial steam temperature to above 700°C, and achieve a power generation efficiency of up to 50%. However, it is not easy to increase the initial steam temperature to 700°C. High-temperature and high-pressure steam has extremely strict requirements on the performance of pipe metal materials. A large boiler system requires a large amount of high-performance high-temperature metal materials, which is expensive. In addition, since steam and high-temperature flue gas exchange heat across the metal wall in conventional boilers, there is a large thermal resistance in the middle, and the cooling effect of ultra-high-temperature steam on the metal wall is very poor, and the metal temperature of the pipe on the heating surface is very high, especially The metal wall temperature on the flue gas side is higher, such a harsh working environment shortens the life of the pipeline and the overall reliability of the unit is poor. In order to achieve the goal of further improving the initial parameters of steam, while improving the performance of high-temperature metal materials, innovating steam heat exchange methods and improving the working environment of metal parts of heat exchangers are also an important way to improve system stability.

At the same time, IGCC (Integrated Gasification Combined Cycle) power generation has become another important direction for the development of coal power technology in the future due to its superior environmental performance of zero pollutant emissions. It is the CO2 capture method most likely to be implemented on a large scale because of its significant low energy consumption advantage. IGCC technology firstly gasifies coal into syngas through a gasifier, and the main components of syngas are CO and H2. CO2 capture technology before combustion can react CO and H2O to generate H2 and CO2 through water-gas shift. After CO2 is separated and captured , the main component of the remaining syngas fuel is H2, therefore, a large amount of H2 fuel will be obtained after CO2 capture before combustion. my country has built and put into operation an IGCC demonstration power plant in Tianjin. After commissioning and operation, good results have been achieved. The pre-combustion CO2 capture device based on IGCC has also been built in this plant and will soon be put into operation. Therefore, once the pre-combustion CO2 capture technology is mature, a large amount of hydrogen resources will be generated after CO2 capture. As a high-calorie, non-polluting, high-quality fuel, hydrogen must be utilized in the most effective way in order to exert its value.

There are no reports showing the combination of thermal power plant steam power cycle and IGCC (Integrated Gasification Combined Cycle) power generation.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a super high temperature steam power cycle system using hydrogen injection combustion hybrid heating, which is suitable for large-scale thermal power plants, and can increase the initial temperature of steam in the steam power cycle to Above 700°C, the power generation efficiency of the unit is increased to more than 50%, which can effectively reduce the temperature of the metal wall surface and improve the reliability and stability of the unit.

In order to achieve the above object, the technical scheme that the present invention takes is:

An ultra-high temperature steam power circulation system adopting hydrogen injection combustion hybrid heating, comprising a steam turbine high-pressure cylinder 1, a steam turbine high-pressure cylinder 1, a steam turbine medium-pressure cylinder 2, and a steam turbine low-pressure cylinder 3 arranged in series and coaxially in sequence and connected to a generator 4, The steam turbine high-pressure cylinder 1 outlet is connected to the steam inlet of the second-stage hydrogen injection combustion hybrid heater 18, and the steam outlet of the second-stage hydrogen injection combustion hybrid heater 18 is connected to the steam inlet of the steam turbine medium-pressure cylinder 2, and the steam turbine medium-pressure cylinder 2 steam inlet The outlet is connected to the steam inlet of steam turbine low-pressure cylinder 3, the steam outlet of steam turbine low-pressure cylinder 3 is connected to the steam inlet of condenser 5, the hot well of condenser 5 is connected to the inlet of condensate pump 6, and the outlet of condensate pump 6 is condensed to 8# low-pressure heater 7 The water inlet is connected, the 8# low pressure heater 7 heating steam inlet is connected with the steam turbine low pressure cylinder 3 last stage steam extraction port, the 8# low pressure heater 7 condensate outlet is connected with the 7# low pressure heater 8 condensate inlet, 7# low pressure The heating steam inlet of heater 8 is connected with the penultimate steam extraction port of steam turbine low-pressure cylinder 3, the condensate outlet of 7# low-pressure heater 8 is connected with the condensate inlet of 6# low-pressure heater 9, and the heating steam inlet of 6# low-pressure heater 9 It is connected to the first-stage steam extraction port of the steam turbine low-pressure cylinder 3, the condensate outlet of 6# low-pressure heater 9 is connected to the condensate inlet of 5# low-pressure heater 10, and the heating steam inlet of 5# low-pressure heater 10 is connected to the steam turbine medium-pressure cylinder 2 most The final stage extraction port is connected, the condensate outlet of 5# low pressure heater 10 is connected with the condensate inlet of deaerator 11, the heating steam inlet of deaerator 11 is connected with the second stage extraction port of medium pressure cylinder 2 of steam turbine, and the deaerator 11 outlet is connected to feed water pump 12 inlet, feed water pump 12 outlet is connected to 3# high pressure heater 13 feed water inlet, 3# high pressure heater 13 heating steam inlet is connected to steam turbine medium pressure cylinder 2 first stage steam extraction port, 3# high pressure The water supply outlet of heater 13 is connected to the water supply inlet of 2# high pressure heater 14, the heating steam inlet of 2# high pressure heater 14 is connected to the second stage extraction port of steam turbine high pressure cylinder 1, the water supply outlet of 2# high pressure heater 14 is connected to 1# high pressure The heater 15 is connected to the feed water inlet, the 1# high pressure heater 15 heating steam inlet is connected to the steam turbine high pressure cylinder 1 first stage steam extraction port, the 1# high pressure heater 15 feed water outlet is connected to the first stage hydrogen injection combustion hybrid heater 16 feed water The inlet is connected, the outlet of the first-stage hydrogen injection combustion hybrid heater 16 is connected to the steam inlet of the steam-water separator 17, the drain outlet of the steam-water separator 17 is connected to the drain inlet of the deaerator 11, and the steam outlet of the steam-water separator 17 is connected to the high-pressure cylinder of the steam turbine 1 The steam inlet is connected, the steam outlet of the steam-water separator 17 is provided with a steam bypass to connect with the steam inlet of the condenser 5, the first stage hydrogen injection combustion hybrid heater 16, the second stage hydrogen injection combustion hybrid heater 18 hydrogen inlet Connected to the hydrogen system 19, the first stage hydrogen injection combustion hybrid heater 16, the second stage hydrogen injection combustion hybrid heater 18, the oxygen inlet is connected to the oxygen system 20, the 1# high pressure heater 15 drain outlet is connected to the 2# high pressure heating 14 drain inlet of 2# high pressure heater and 13 drain inlet of 3# high pressure heater Connected, 3# high-pressure heater 13 drain outlet is connected to deaerator 11 drain inlet, and the drain formed after the steam extraction from steam turbine is heated to feed water is collected to deaerator 11 through self-flow step by step; 5# low-pressure heater 10 drain outlet Connect with 6# low pressure heater 9 drain inlet, 6# low pressure heater 9 drain outlet connect with 7# low pressure heater 8 drain inlet, 7# low pressure heater 8 drain outlet connect with 8# low pressure heater 7 drain inlet, 8 #The drain outlet of low pressure heater 7 is connected to the drain inlet of condenser 5, and the drain formed after the condensed water is heated by the extracted steam from the steam turbine is collected to the condenser 5 through self-flow step by step.

The first stage hydrogen injection combustion hybrid heater 16 and the second stage hydrogen injection combustion hybrid heater 18 are connected to the hydrogen system 19 through the corresponding regulating valve. The first stage hydrogen injection combustion hybrid heater 16, The oxygen inlet of the second-stage hydrogen-injection combustion hybrid heater 18 is connected with the oxygen system 20 through a corresponding regulating valve.

The first-stage hydrogen-injection combustion hybrid heater 16 and the second-stage hydrogen injection combustion hybrid heater 18 include a heater shell 29. The front section inside the heater shell 29 is a combustion zone 32, and the rear section is a mixing zone 28. The inner wall of the zone 32 is provided with a water film/steam film hole 25, and the outlet of the combustion zone 32 communicates with the mixing zone 28, and the combustion reaction of hydrogen and oxygen occurs in the combustion zone 32, and water/steam is injected into the combustion zone 32 to participate in the mixed combustion, and the combustion The product steam comes out of the combustion zone 32 and enters the mixing zone 28, where it mixes and exchanges heat with the rest of the feed water/steam to form homogeneous high-temperature steam.

The beneficial effects of the present invention are:

1. The present invention saves the huge boiler device of the thermal power plant and replaces it with a two-stage hydrogen injection combustion hybrid heater, which greatly shortens the pipeline flow, makes the layout of the steam power system more compact, reduces the metal consumption of the pipeline, and reduces Soda flow resistance loss.

2. Through hydrogen injection combustion and mixed heating, the new steam temperature of the steam power cycle can be raised from the current 560-600°C to over 700°C without increasing the metal wall temperature of the heat exchanger, so that the efficiency of the steam power cycle can be increased from 40-45% is increased to more than 50%, which greatly improves the power generation efficiency of thermal power plants.

3. Since the hydrogen-injection combustion hybrid heater adopts hydrogen-oxygen ratio combustion, the product produced is only water, and the combustion product is directly mixed with feed water or steam for heating, thus eliminating the need for the metal wall thermal resistance of the separated heat exchanger, and exchanging Heat rate increased. At the same time, since the water film or steam film hole 25 can be used for cooling, the metal of the burner can avoid working in a high-temperature and harsh environment, and the life of the metal is prolonged, so that expensive high-performance high-temperature metal materials can be saved and the system cost can be reduced.

4. The second-stage hydrogen-injection combustion hybrid heater 18 is used as a steam reheater. During the start-up stage of the unit, when no cold reheat steam flows through the reheater, no hydrogen and oxygen are injected for combustion heating. In this way, the problem of dry burning of the reheater that occurs during the boiler start-up process of the conventional boiler unit is avoided, and the reliability is improved.

5. Using hydrogen and oxygen fuel, the start and stop of the hydrogen injection combustion hybrid heater is flexible and simple, the flow of soda and water is short, and the thermal inertia is small, so the overall unit starts and stops flexibly and quickly, and has good load changing performance.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic structural diagram of a hydrogen injection combustion hybrid heater.

detailed description

The present invention is described in detail below in conjunction with accompanying drawing and embodiment, and present embodiment is the generator set of 1000MW level.

Referring to Figure 1, an ultra-high temperature steam power cycle system using hydrogen injection combustion hybrid heating, including steam turbine high-pressure cylinder 1, steam turbine high-pressure cylinder 1, steam turbine medium-pressure cylinder 2, and steam turbine low-pressure cylinder 3 are arranged in series and coaxially with the power generation The generator 4 is connected to drive the generator 4 to generate electricity. The outlet of the high-pressure cylinder 1 of the steam turbine is connected to the steam inlet of the second-stage hydrogen-injection combustion hybrid heater 18, and the steam outlet of the second-stage hydrogen-injection combustion hybrid heater 18 is connected to the medium-pressure cylinder 2 of the steam turbine. The steam inlet is connected, the steam outlet of the medium pressure cylinder 2 of the steam turbine is connected with the steam inlet of the low pressure cylinder 3 of the steam turbine, the steam outlet of the low pressure cylinder 3 of the steam turbine is connected with the steam inlet of the condenser 5, the hot well of the condenser 5 is connected with the 6 inlet of the condensate pump, and the condensate pump 6 outlet is connected to 8# low pressure heater 7 condensate inlet, 8# low pressure heater 7 heating steam inlet is connected to steam turbine low pressure cylinder 3 last stage steam extraction port, 8# low pressure heater 7 condensate outlet is connected to 7# low pressure heating The condensate inlet of the 8# low pressure heater is connected to the condensed water inlet of the 7# low pressure heater 8, which is connected to the penultimate steam extraction port of the steam turbine low pressure cylinder 3, and the condensed water outlet of the 7# low pressure heater 8 is connected to the condensed water inlet of the 6# low pressure heater 9 , 6# low-pressure heater 9 heating steam inlet is connected to the steam turbine low-pressure cylinder 3 first-stage steam extraction port, 6# low-pressure heater 9 condensate outlet is connected to 5# low-pressure heater 10 condensate inlet, 5# low-pressure heater 10 The heating steam inlet is connected to the steam extraction port of the last stage of the medium-pressure cylinder of the steam turbine, the condensate outlet of the 5# low-pressure heater 10 is connected to the condensate inlet of the deaerator 11, and the heating steam inlet of the deaerator 11 is connected to the second stage of the steam turbine medium-pressure cylinder 2 The outlet of deaerator 11 is connected to the inlet of feedwater pump 12, the outlet of feedwater pump 12 is connected to the inlet of 3# high pressure heater 13, and the inlet of 3# high pressure heater 13 is connected to the first stage of medium pressure cylinder of steam turbine The steam extraction port is connected, the water supply outlet of 3# high pressure heater 13 is connected with the water supply inlet of 2# high pressure heater 14, the heating steam inlet of 2# high pressure heater 14 is connected with the second stage extraction port of the steam turbine high pressure cylinder, and the 2# high pressure heater 14 feed water outlet is connected with 1# high pressure heater 15 feed water inlet, 1# high pressure heater 15 heating steam inlet is connected with steam turbine high pressure cylinder first stage steam extraction port, 1# high pressure heater 15 feed water outlet is connected with first stage hydrogen injection combustion The hybrid heater 16 is connected to the feedwater inlet, the outlet of the first-stage hydrogen injection combustion hybrid heater 16 is connected to the steam inlet of the steam-water separator 17, the drain outlet of the steam-water separator 17 is connected to the drain inlet of the deaerator 11, and the steam-water separator 17 The steam outlet is connected to the steam inlet of the high-pressure cylinder 1 of the steam turbine, the steam outlet of the steam-water separator 17 is provided with a steam bypass and connected to the steam inlet of the condenser 5, the first stage hydrogen injection combustion hybrid heater 16, the second stage hydrogen injection combustion hybrid The hydrogen inlet of the type heater 18 is connected to the hydrogen system 19, the first-stage hydrogen injection combustion hybrid heater 16, and the second-stage hydrogen injection combustion hybrid heater 18 oxygen inlet are connected to the oxygen system 20, respectively for the first-stage hydrogen injection Combustion hybrid heater 16 and second-stage hydrogen injection combustion hybrid heater 17 provide pure hydrogen and pure oxygen, with arrows in Fig. 1 The dotted line of the head shows the drain flow direction of heaters at all levels. The drain outlet of 1# high pressure heater 15 is connected with the drain inlet of 2# high pressure heater 14, and the drain outlet of 2# high pressure heater 14 is connected with the drain inlet of 3# high pressure heater 13. , the drain outlet of 3# high pressure heater 13 is connected with the drain inlet of deaerator 11, and the drain formed after the steam extraction from the steam turbine is heated to the feedwater is collected to the deaerator 11 through self-flow step by step; the drain outlet of 5# low pressure heater 10 is connected with 6# low pressure heater 9 drain inlet is connected, 6# low pressure heater 9 drain outlet is connected with 7# low pressure heater 8 drain inlet, 7# low pressure heater 8 drain outlet is connected with 8# low pressure heater 7 drain inlet, 8# The drain outlet of the low-pressure heater 7 is connected to the drain inlet of the condenser 5, and the drain formed after the condensed water is heated by the extraction steam from the steam turbine is collected to the condenser 5 through a self-flow step by step.

The first stage hydrogen injection combustion hybrid heater 16 and the second stage hydrogen injection combustion hybrid heater 18 are connected to the hydrogen system 19 through the corresponding regulating valve. The first stage hydrogen injection combustion hybrid heater 16, The oxygen inlet of the second-stage hydrogen-injection combustion hybrid heater 18 is connected to the oxygen system 20 through a corresponding regulating valve for precise flow control.

Referring to Fig. 2, the first-stage hydrogen-injection combustion hybrid heater 16 and the second-stage hydrogen-injection combustion hybrid heater 18 include a heater casing 29, the front section of the heater casing 29 is a combustion zone 32, and the rear section is a mixing zone. Zone 28 and combustion zone 32 are provided with a combustion chamber casing 30, the front end of the combustion chamber casing 30 communicates with the water supply/steam inlet 21, the hydrogen gas inlet 22 and the oxygen inlet 23 are respectively arranged in the combustion zone through the hydrogen gas distribution nozzle 34 and the oxygen distribution nozzle 33 At the entrance of 32, ignition device 24 is also arranged at the entrance of combustion zone 32, and flame tube 31 is arranged in combustion zone 32, and water film/steam film hole 25 is provided on combustion zone 32 inner walls, and combustion zone 32 exits and mixing zone 28 is connected, the front end of the mixing zone 28 is provided with a water/steam nozzle 26, the rear end of the mixing zone 28 is a steam outlet 27, and the combustion reaction of hydrogen and oxygen occurs in the combustion zone 32, and water/steam is injected into the combustion zone 32 to participate in the mixed combustion. The combustion product steam comes out of the combustion zone 32 and enters the mixing zone 28, where it mixes and exchanges heat with the rest of the feed water/steam to form homogeneous high-temperature steam. The inner wall of the combustion zone 32 is protected by a water film/steam film cooling hole 25 to prevent the metal of the burner from Working in high temperature and harsh environment, the life of the metal is prolonged, so it can save expensive high-performance high-temperature metal materials and reduce the cost of the system.

Working principle of the present invention is:

8# low pressure heater 7, 7# low pressure heater 8, 6# low pressure heater 9, 5# low pressure heater 10, deaerator 11, feed water pump 12, 3# high pressure heater 13, 2# high pressure heater 14. The feedwater recuperation and preheating system consisting of 1# high pressure heater 15, the connecting pipeline and the steam extraction pipeline leading from the steam turbine provides feedwater with a pressure of about 36MPa and a temperature of about 300℃, and the feedwater comes out from the outlet of 1# high pressure heater 15 After that, it is sent to the first-stage hydrogen injection combustion hybrid heater 16. At the same time, the hydrogen and oxygen respectively provided by the hydrogen system 19 and the oxygen system 20 are injected into the first-stage injector with a two-to-one molar flow ratio through precise control. Hydrogen combustion hybrid heater 16, hydrogen and oxygen are completely combusted in the first-stage hydrogen injection combustion hybrid heater 16 and mixed with feed water for heat exchange, finally generating high-temperature and high-pressure steam. The high-temperature and high-pressure steam is sent to the steam-water separator 17 after coming out of the first-stage hydrogen-injection combustion hybrid heater 16 .

During the start-up and shutdown of the unit, if the steam entering the steam-water separator 17 carries water, the steam-water separator 17 will separate the liquid water and send it to the deaerator 11 for recovery through the pipeline. The steam coming out from the top of the steam-water separator 17 can be directly sent to the condenser 5 through a bypass when the unit starts and stops for example, and is condensed and recovered by the condenser 5. When the steam turbine is in normal operation, the new steam is sent into the high-pressure cylinder 1 of the steam turbine after coming out of the steam-water separator 17 to expand and perform work.

The exhaust steam from the high-pressure cylinder 1 of the steam turbine is sent as cold reheat steam to the second-stage hydrogen-injection combustion hybrid heater 18. At the same time, the molar flow rates of pure hydrogen and pure oxygen provided by the hydrogen system 19 and oxygen system 20 are two to one The ratio is injected into the second-stage hydrogen-injection-combustion hybrid heater 18, and hydrogen and oxygen are completely combusted in the second-stage hydrogen-injection-combustion hybrid heater 18 and mixed with cold reheat steam to form hot reheat steam.

The hot reheated steam comes out from the second-stage internal combustion mixed heater 18 and is sent to the medium-pressure cylinder 2 of the steam turbine for expansion and work, and the exhaust steam from the medium-pressure cylinder 2 of the steam turbine is sent to the low-pressure cylinder 3 of the steam turbine to continue to expand and perform work. The high, medium and low pressure cylinders of the steam turbine are coaxially connected in series with the generator 4 and drive the generator to generate electricity. The exhaust steam from the low-pressure cylinder 3 of the steam turbine is sent to the condenser 5 to be cooled and condensed into condensed water. The condensed water pump 6 draws condensed water from the hot well of the condenser 5 and sends it to the 8# low-pressure heater 7. After the eighth stage of the steam turbine extracts steam to heat up the temperature, the condensed water at the outlet of the 8# low-pressure heater 7 is sent to the 7# low-pressure heater 8. The heating temperature continues to rise after the seventh-stage steam extraction of the steam turbine, and the condensed water at the outlet of the 7# low-pressure heater 8 is sent to the 6# low-pressure heater 9, and the heating temperature continues to rise after the sixth-stage extraction of the steam turbine, and the 6# low-pressure heating The condensed water at the outlet of 5# low-pressure heater 10 is sent to 5# low-pressure heater 10, and the heating temperature continues to rise after the fifth-stage steam extraction of the steam turbine. The heating temperature continues to rise while removing dissolved oxygen in the water. The feed water at the outlet of deaerator 11 is boosted to above 36MPa by feed water pump 12 and sent to 3# high-pressure heater 13, and the temperature continues to rise after the third stage extraction of steam turbine, and the feed water at the outlet of 3# high-pressure heater 13 is sent to 2# high pressure The heating temperature of heater 14 continues to rise after the second-stage steam extraction of the steam turbine, and the feed water at the outlet of 2# high-pressure heater 14 is sent to 1# high-pressure heater 15, and the heating temperature continues to rise after the first-stage steam extraction of the steam turbine, 1# The outlet feedwater of the high-pressure heater 15 is sent to the first-stage hydrogen-injection-combustion hybrid heater 16 .

Since the product of hydrogen-oxygen combustion is pure water, the steam produced by hydrogen-oxygen combustion accounts for about 15% of the total steam volume, which plays a role in replenishing water in the circulation system. In addition to the loss of steam leakage in the system, the amount of water in the system will still gradually increase. , the balance of the system water volume can be maintained by adjusting the water level of the condenser 5. The water level of the condenser 5 is adjusted by draining water or replenishing desalted water according to different working conditions.

So far, the system has completed a complete steam power cycle process. The high, medium and low pressure cylinders of the steam turbine are coaxially connected in series and connected with the generator 4 to drive the generator 4 to rotate and generate electricity. The main node parameters of the steady-state operation of the steam power cycle system in this example are listed in Table 1. Under steady-state conditions, the power generation of the steam turbine is 1058.55MW, and the power generation efficiency of the steam power cycle is 62%.

Claims (1)

1. An ultra-high temperature steam power cycle system using hydrogen injection combustion hybrid heating, including a steam turbine high-pressure cylinder (1), a steam turbine medium-pressure cylinder (2) and a steam turbine low-pressure cylinder (3) arranged in series and coaxially with the generator (4) connection, characterized in that: the steam turbine high-pressure cylinder (1) outlet is connected to the steam inlet of the second stage hydrogen injection combustion hybrid heater (18), and the second stage hydrogen injection combustion hybrid heater (18) steam outlet is connected to the The steam inlet of the steam turbine medium pressure cylinder (2) is connected, the steam outlet of the steam turbine medium pressure cylinder (2) is connected with the steam inlet of the steam turbine low pressure cylinder (3), the steam outlet of the steam turbine low pressure cylinder (3) is connected with the steam inlet of the condenser (5), The hot well of the condenser (5) is connected to the inlet of the condensate pump (6), the outlet of the condensate pump (6) is connected to the condensate inlet of the 8# low pressure heater (7), and the 8# low pressure heater (7) heats the steam inlet to the steam turbine The last stage of the low-pressure cylinder (3) is connected to the steam extraction port, the condensate outlet of the 8# low-pressure heater (7) is connected to the condensate inlet of the 7# low-pressure heater (8), and the heating steam inlet of the 7# low-pressure heater (8) is connected to the The steam turbine low-pressure cylinder (3) is connected to the penultimate steam extraction port, the condensate outlet of the 7# low-pressure heater (8) is connected to the condensate inlet of the 6# low-pressure heater (9), and the 6# low-pressure heater (9) heats the steam The inlet is connected to the first-stage steam extraction port of the low-pressure cylinder (3) of the steam turbine, the condensate outlet of the 6# low-pressure heater (9) is connected to the condensate inlet of the 5# low-pressure heater (10), and the 5# low-pressure heater (10) is heated The steam inlet is connected to the steam extraction port of the last stage of the medium-pressure cylinder (2) of the steam turbine, the condensate outlet of the 5# low-pressure heater (10) is connected to the condensate inlet of the deaerator (11), and the steam inlet of the deaerator (11) is heated Connect with the steam turbine medium pressure cylinder (2) second-stage steam extraction port, connect the outlet of the deaerator (11) with the inlet of the feed water pump (12), connect the outlet of the feed water pump (12) with the feed water inlet of the 3# high pressure heater (13) , the heating steam inlet of 3# high pressure heater (13) is connected with the first-stage steam extraction port of steam turbine medium pressure cylinder (2), the water supply outlet of 3# high pressure heater (13) is connected with the water supply inlet of 2# high pressure heater (14) , the heating steam inlet of 2# high pressure heater (14) is connected with the second-stage steam extraction port of steam turbine high pressure cylinder (1), the water supply outlet of 2# high pressure heater (14) is connected with the water supply inlet of 1# high pressure heater (15), The heating steam inlet of 1# high pressure heater (15) is connected to the first-stage steam extraction port of the steam turbine high-pressure cylinder (1), and the water supply outlet of 1# high-pressure heater (15) is connected to the first-stage hydrogen injection combustion hybrid heater (16) The feedwater inlet is connected, the outlet of the first-stage hydrogen injection combustion hybrid heater (16) is connected to the steam inlet of the steam-water separator (17), and the steam-water separator (17) drain outlet is connected to the drain inlet of the deaerator (11). The steam outlet of the separator (17) is connected to the steam inlet of the steam turbine high-pressure cylinder (1), the steam outlet of the steam-water separator (17) is connected to the steam inlet of the condenser (5) by a steam bypass, and the first-stage hydrogen injection combustion hybrid type Heater (16), second stage hydrogen injection combustion hybrid heater (18) The hydrogen inlet is connected to the hydrogen system (19), the first stage hydrogen injection combustion hybrid heater (16), the second stage hydrogen injection combustion hybrid heater (18) oxygen inlet is connected to the oxygen system (20), The drain outlet of 1# high pressure heater (15) is connected with the drain inlet of 2# high pressure heater (14), the drain outlet of 2# high pressure heater (14) is connected with the drain inlet of 3# high pressure heater (13), and the 3# high pressure heater The drain outlet of the device (13) is connected to the drain inlet of the deaerator (11), and the drain formed after the steam extraction from the steam turbine is heated to the feed water is collected to the deaerator (11) by gravity step by step; 5# low-pressure heater (10) The drain outlet is connected to the drain inlet of 6# low pressure heater (9), the drain outlet of 6# low pressure heater (9) is connected to the drain inlet of 7# low pressure heater (8), and the drain outlet of 7# low pressure heater (8) is connected to 8 #Low pressure heater (7) drain inlet is connected, 8# low pressure heater (7) drain outlet is connected with condenser (5) drain inlet, and the drain formed after steam extraction from steam turbine heats condensed water is collected by gravity step by step To condenser (5); The hydrogen inlet of the first stage hydrogen injection combustion hybrid heater (16) and the second stage hydrogen injection combustion hybrid heater (18) are connected to the hydrogen system (19) through corresponding adjustment valves, and the first stage hydrogen injection combustion The oxygen inlet of the hybrid heater (16), the second-stage hydrogen injection combustion hybrid heater (18) is connected with the oxygen system (20) through a corresponding regulating valve; The first-stage hydrogen injection combustion hybrid heater (16) and the second stage hydrogen injection combustion hybrid heater (18) include a heater shell (29), and the inner front section of the heater shell (29) is a combustion zone (32 ), the back section is the mixing zone (28), the combustion zone (32) inner wall surface is provided with water film/steam film holes (25), the combustion zone (32) outlet communicates with the mixing zone (28), and in the combustion zone (32) The combustion reaction of hydrogen and oxygen occurs inside, and at the same time, water/steam is injected into the combustion zone (32) to participate in the mixed combustion, and the combustion product steam comes out of the combustion zone (32) and enters the mixing zone (28), where it mixes with the rest of the feed water/steam to form Homogeneous high temperature steam.