CN119043033A - Natural gas residual pressure power generation and natural gas melting furnace/boiler coupling combined supply system - Google Patents
Natural gas residual pressure power generation and natural gas melting furnace/boiler coupling combined supply system Download PDFInfo
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- CN119043033A CN119043033A CN202411174116.7A CN202411174116A CN119043033A CN 119043033 A CN119043033 A CN 119043033A CN 202411174116 A CN202411174116 A CN 202411174116A CN 119043033 A CN119043033 A CN 119043033A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
- F24D11/005—Central heating systems using heat accumulated in storage masses water heating system with recuperation of waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D18/00—Small-scale combined heat and power [CHP] generation systems specially adapted for domestic heating, space heating or domestic hot-water supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2101/00—Electric generators of small-scale CHP systems
- F24D2101/70—Electric generators driven by internal combustion engines [ICE]
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
本发明公开了一种天然气余压发电与天然气熔窑/锅炉耦合联供系统，涉及天然气压力能利用技术领域。天然气余压发电与天然气熔窑耦合联供系统包括天然气余压发电子系统、天然气熔窑和天然气再热换热器，天然气余压发电子系统包括第一膨胀机和第一发电机；第一膨胀机驱动所述第一发电机；第一膨胀机的进口与天然气高压管网连接，第一膨胀机的出口与天然气再热换热器的冷侧进口连通；天然气再热换热器的冷侧出口与天然气熔窑的进气口连通，天然气再热换热器的热侧利用天然气熔窑的排气的废热。本发明解决了天然气管网中的压力能被浪费的技术问题，具有高效回收并利用高压天然气的压力能的技术效果。
The present invention discloses a natural gas excess pressure power generation and natural gas melting furnace/boiler coupled cogeneration system, which relates to the technical field of natural gas pressure energy utilization. The natural gas excess pressure power generation and natural gas melting furnace coupled cogeneration system comprises a natural gas excess pressure power generation subsystem, a natural gas melting furnace and a natural gas reheat heat exchanger, and the natural gas excess pressure power generation subsystem comprises a first expander and a first generator; the first expander drives the first generator; the inlet of the first expander is connected to the natural gas high-pressure pipeline network, and the outlet of the first expander is connected to the cold side inlet of the natural gas reheat heat exchanger; the cold side outlet of the natural gas reheat heat exchanger is connected to the air inlet of the natural gas melting furnace, and the hot side of the natural gas reheat heat exchanger utilizes the waste heat of the exhaust gas of the natural gas melting furnace. The present invention solves the technical problem of pressure energy being wasted in the natural gas pipeline network, and has the technical effect of efficiently recovering and utilizing the pressure energy of high-pressure natural gas.
Description
Technical Field
The invention relates to the technical field of natural gas pressure energy utilization, in particular to a natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system and a natural gas residual pressure power generation and natural gas boiler coupling combined supply system.
Background
With the adjustment of energy structures, the country is greatly advocating the use of clean energy, natural gas is a clean energy, and the use of natural gas instead of the traditional coal burning technology is a major trend. At present, natural gas is used for replacing the traditional coal burning technology in an application scene, and the energy is released by burning gaseous natural gas by utilizing the advantages of high heat value of the natural gas and environmental friendliness of natural gas combustion. For example, the power industry employs gas turbines to generate electricity from natural gas. In a gas turbine, natural gas is combusted to generate high-temperature and high-pressure gas, which pushes a turbine to rotate, and then drives a generator to generate electricity. For another example, in the field of industrial melting furnaces, a natural gas melting furnace is used for replacing a gas melting furnace or a petroleum melting furnace, so that the waste emission after combustion can be greatly reduced, the atmospheric pollution is effectively inhibited, and the air quality is obviously improved.
In carrying out the present invention, the inventors have found that there is at least a problem in the prior art in that long distance natural gas transportation is carried by high pressure through long distance pipeline because gaseous natural gas is inconvenient to transport. Natural gas in the long-distance pipeline is in a high-pressure state. When in use, the high-pressure natural gas can reach the use condition after pressure reduction and pressure regulation for a plurality of times. In the pressure reducing and regulating process, the pressure of the high-pressure natural gas can be wasted. Based on the above, how to efficiently recycle the pressure energy in the natural gas pipe network, thereby improving the energy utilization efficiency of the natural gas is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system capable of recycling and utilizing pressure energy of high-pressure natural gas and a natural gas boiler coupling combined supply system.
In order to achieve the purpose, on the one hand, the coupling and supplying system of the natural gas residual pressure power generation and the natural gas melting furnace is provided, the coupling and supplying system comprises a natural gas residual pressure power generation subsystem which utilizes high-pressure natural gas pressure energy to generate power, the natural gas residual pressure power generation subsystem comprises a first expander and a first power generator, an inlet of the first expander is connected with a natural gas high-pressure pipe network, an output shaft of the first expander drives the first power generator to generate power, an outlet of the first expander is low-pressure natural gas, the low-pressure natural gas is introduced into the natural gas melting furnace through a cold side of a natural gas reheating heat exchanger to serve as fuel of the natural gas melting furnace, the low-pressure natural gas combusted by the natural gas melting furnace is changed into high-temperature waste gas, the high-temperature waste gas is discharged from an exhaust port of the natural gas melting furnace, and a heat source at a hot side of a natural gas reheating heat exchanger is used for heating the low-pressure natural gas introduced into the natural gas melting furnace in the natural gas reheating heat exchanger.
The natural gas reheating device comprises a natural gas reheating heat exchanger, a natural gas preheating heat exchanger, a waste heat exchanger, a first heat storage medium, a circuit and a cooling system, wherein the hot side inlet of the waste heat exchanger is communicated with an exhaust port of the natural gas reheating heat exchanger, the cold side of the waste heat exchanger and the hot side of the natural gas reheating heat exchanger form the circuit, the circuit is internally circulated with the first heat storage medium, the first heat storage medium on the cold side of the waste heat exchanger is heated by high-temperature waste gas on the hot side of the waste heat exchanger, the heated first heat storage medium enters the hot side of the natural gas reheating heat exchanger through the circuit and exchanges heat with low-temperature natural gas in the cold side of the natural gas reheating heat exchanger, and the cooled first heat storage medium flows out from the hot side of the natural gas reheating heat exchanger and enters the cold side inlet of the waste heat exchanger through the circuit.
Further, a hot side outlet of the waste heat exchanger is communicated with the tail gas treatment device.
Further, the system also comprises a heat user, and the cold side outlet of the waste heat exchanger is communicated with the heat user.
Further, the outlet of the heat consumer is in communication with the cold side inlet of the waste heat exchanger.
Further, a main waste heat flow path and a waste heat bypass flow path are arranged at the cold side outlet of the waste heat exchanger, and the waste heat bypass flow path and the main waste heat flow path are connected in parallel; and the cold side outlet of the waste heat exchanger is communicated with the hot side inlet of the natural gas reheating heat exchanger through a waste heat main flow path, and a waste heat storage tank is arranged on the waste heat bypass flow path.
Further, the system also comprises a steam generator, wherein the heat source of the steam generator is also from the high-temperature exhaust gas of the natural gas melting furnace.
Further, the system also comprises a steam power generation subsystem, wherein the steam power generation subsystem comprises a second expander;
The steam generator comprises a steam outlet and a liquid return port, the steam outlet is communicated with the inlet of the second expander, the outlet of the second expander is communicated with the liquid return port, and the output shaft of the second expander drives the second generator to generate electricity.
The heat recovery system comprises a steam generator, a second expansion machine, a heat recovery device and a heat recovery device, and is characterized by further comprising a waste heat exchanger and a heat user, wherein the heat side of the waste heat exchanger is connected between the outlet of the second expansion machine and the liquid return port of the steam generator through a pipeline, the cold side inlet of the waste heat exchanger is communicated with the outlet of the heat user, the cold side outlet of the waste heat exchanger is communicated with the inlet of the heat user to heat or supply hot water for the heat user, and a first heat storage medium is circulated in the pipeline, in which the cold side of the waste heat exchanger is communicated with the heat user.
Further, a cold side outlet of the waste heat exchanger is provided with a waste heat main flow path and a waste heat bypass flow path, the waste heat bypass flow path is connected with the waste heat main flow path in parallel, the cold side outlet of the waste heat exchanger is communicated with an inlet of a heat user through the waste heat main flow path, and a waste heat storage tank is arranged on the waste heat bypass flow path.
The electric power generation device further comprises an electric cabinet, wherein the input end of the electric cabinet is electrically connected with the first generator and/or the second generator, and the output end of the electric cabinet is a self-powered user and/or a power grid.
The high-pressure natural gas flow regulating valve is arranged on a long-distance pipeline at the inlet of the first expansion machine, a low-pressure natural gas flow regulating valve is arranged on a pipeline between the cold side outlet of the natural gas reheating heat exchanger and the air inlet of the natural gas melting furnace, a first circulating pump is arranged at the cold side outlet of the waste heat exchanger, a waste heat bypass regulating valve is arranged at the inlet of the waste heat bypass flow path, the second circulating pump is arranged on the outlet pipeline of the waste heat storage tank, and the high-pressure natural gas flow regulating valve, the waste heat bypass regulating valve, the first circulating pump, the second circulating pump and the control port of the electric cabinet are all electrically connected with the central controller.
Further, the central controller is a DCS controller or a PLC controller.
Further, the second expander is a steam turbine.
Further, the first heat storage medium uses water or heat transfer oil.
Further, the tail gas treatment device is a chimney.
Further, the natural gas reheating heat exchanger further comprises a cold energy recovery device, wherein the cold energy recovery device is arranged between the outlet of the first expander and the cold side inlet of the natural gas reheating heat exchanger.
The natural gas residual pressure power generation and natural gas boiler coupling combined supply system comprises a natural gas residual pressure power generation subsystem, a natural gas boiler and a natural gas reheating heat exchanger, wherein the natural gas residual pressure power generation subsystem comprises a first expander and a first power generator, an inlet of the first expander is connected with a natural gas high-pressure pipe network, an outlet of the first expander is communicated with a cold side inlet of the natural gas reheating heat exchanger, an output shaft of the first expander drives the first power generator to generate power, a cold side outlet of the natural gas reheating heat exchanger is communicated with an air inlet of the natural gas boiler, and a hot side of the natural gas reheating heat exchanger utilizes exhaust waste heat of the natural gas boiler.
The natural gas reheating heat exchanger further comprises a waste heat exchanger, wherein a hot side inlet of the waste heat exchanger is communicated with an exhaust port of the natural gas boiler, a cold side inlet of the waste heat exchanger is communicated with a hot side outlet of the natural gas reheating heat exchanger, a cold side outlet of the waste heat exchanger is communicated with a hot side inlet of the natural gas reheating heat exchanger, and/or a cold side outlet of the waste heat exchanger is connected with a hot user, and a first heat storage medium circulates in a communicating pipeline between the cold side of the waste heat exchanger and the hot side of the natural gas reheating heat exchanger.
The boiler comprises a steam outlet and a liquid return port, the steam outlet is communicated with an inlet of the second expander, an outlet of the second expander is communicated with the liquid return port, and an output shaft of the second expander drives the second generator to generate electricity.
The heat recovery system further comprises a waste heat exchanger and a heat user, wherein the hot side of the waste heat exchanger is connected between the outlet of the second expansion machine and the liquid return port, the cold side inlet of the waste heat exchanger is communicated with the outlet of the heat user, the cold side outlet of the waste heat exchanger is communicated with the inlet of the heat user, and a first heat storage medium is circulated in a pipeline in which the cold side of the waste heat exchanger is communicated with the heat user.
One of the above technical solutions has the following advantages or beneficial effects:
The natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system comprises a natural gas residual pressure power generation subsystem. The natural gas residual pressure power generation subsystem comprises a first expander and a first power generator, the first expander drives the first power generator, and the first expander is used for generating power by utilizing high-pressure natural gas expansion in a high-pressure pipe network, so that the pressure energy which is originally lost in the pressure reduction process of the natural gas in a long-distance pipeline is recovered, and the natural gas is used for generating power.
The natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system of the scheme also comprises a natural gas reheating heat exchanger and a natural gas melting furnace. Natural gas kilns are used in the smelting industry, for example for smelting metals, glass, ceramics and the like, and are kilns that utilize natural gas combustion, the exhaust gas from natural gas kilns is the product of natural gas combustion, and the exhaust gas has a very high temperature. The natural gas reheating heat exchanger utilizes high-temperature exhaust gas of the natural gas melting furnace to carry out reheating treatment on the low-temperature low-pressure natural gas after expansion, and the natural gas after heating is introduced into the natural gas melting furnace for combustion.
Specifically, the inlet of the first expander is high-pressure natural gas in a high-pressure pipe network, and after expansion power generation, the outlet of the first expander is low-temperature low-pressure natural gas. The outlet of the first expander is communicated with the cold side inlet of the natural gas reheating heat exchanger, the cold side outlet of the natural gas reheating heat exchanger is communicated with the air inlet of the natural gas melting furnace, and the hot side of the natural gas reheating heat exchanger utilizes waste heat of exhaust gas of the natural gas melting furnace. In the natural gas reheating heat exchanger, the low-temperature low-pressure natural gas at the outlet of the first expander is heated by utilizing heat at the hot side, so that the low-temperature low-pressure natural gas is changed into high-temperature low-pressure natural gas, and the expanded low-temperature natural gas meets the use condition. Then, the natural gas with high temperature and low pressure enters the natural gas melting furnace to carry out combustion reaction and release heat, and the natural gas after the combustion reaction becomes high-temperature exhaust. The high-temperature exhaust gas is introduced into the hot side of the natural gas reheating heat exchanger and is used for heating the low-temperature and low-pressure natural gas at the outlet of the first expander.
The other technical scheme has the following advantages or beneficial effects:
The natural gas residual pressure power generation and natural gas boiler coupling combined supply system comprises a natural gas residual pressure power generation subsystem, wherein the natural gas residual pressure power generation subsystem comprises a first expander and a first generator, the first expander drives the first generator, the first expander is used for driving the natural gas first expander to generate power by utilizing the pressure difference between high pressure in a high-pressure pipe network and pressure difference in a downstream pipe network, and the pressure energy which is originally lost in the pressure reduction process of natural gas in a long-distance pipeline is recovered.
The system also comprises a natural gas boiler and a natural gas reheating heat exchanger, wherein the natural gas boiler is a boiler using natural gas as fuel, water or other mediums are arranged in the boiler, the mediums are changed into high-temperature steam through natural gas heating, exhaust gas of the natural gas boiler is exhaust gas discharged after the natural gas is combusted, and the high-temperature exhaust gas is high-temperature waste heat and is utilized through the natural gas reheating heat exchanger. The natural gas reheating heat exchanger is used for carrying out reheating treatment on the low-temperature low-pressure natural gas after expansion by utilizing exhaust waste heat of the natural gas boiler.
In summary, this scheme, first, be provided with natural gas excess pressure power generation subsystem, can retrieve the pressure energy of natural gas in long-distance pipeline through it to become the electric energy with the pressure energy of retrieving. On the other hand, the natural gas reheating heat exchanger and the natural gas melting furnace or the natural gas boiler are arranged, the natural gas reheating heat exchanger recovers low-temperature and low-pressure natural gas at the outlet of the first expansion machine in the natural gas residual pressure power generation subsystem, and the low-temperature and low-pressure natural gas is heated by using high-temperature exhaust gas after the natural gas melting furnace or the natural gas boiler burns. The low-temperature low-pressure natural gas is changed into high-temperature low-pressure natural gas after being heated by the hot side of the natural gas reheating heat exchanger, and then is changed into reusable natural gas, the reusable natural gas is used as fuel to be introduced into a natural gas melting furnace or a natural gas boiler, the natural gas melting furnace is used for smelting industry, and the natural gas boiler is used for generating steam. Therefore, the scheme can efficiently recycle and utilize the pressure energy of the high-pressure natural gas, and particularly can efficiently recycle the pressure energy of the natural gas in a power plant utilizing the natural gas or a place where the natural gas is used for calcining materials and the natural gas is used for manufacturing steam.
Drawings
FIG. 1 is a flow chart of a natural gas excess pressure power generation and natural gas melter coupled co-feed system of embodiment one;
FIG. 2 is a flow chart of a natural gas excess pressure power generation and natural gas melting furnace coupling co-supply system according to the second embodiment;
fig. 3 is a flow chart of a natural gas excess pressure power generation and natural gas boiler coupling co-generation system according to the third embodiment.
In the figure, a 1-high-pressure natural gas flow regulating valve, a 2-first expander, a 3-first speed reducer, a 4-first generator, a 5-cold energy recovery device, a 6-natural gas reheating heat exchanger, a 7-low-pressure natural gas flow regulating valve, an 8-natural gas melting furnace, a 9-steam generator, a 10-waste heat exchanger, a 101-waste heat main flow path, a 102-waste heat bypass flow path, a 103-waste heat first branch, a 104-waste heat second branch, an 11-tail gas treatment device, a 12-second expander, a 13-second speed reducer, a 14-second generator, a 15-waste heat exchanger, a 151-waste heat main flow path, a 152-waste heat bypass flow path, a 153-waste heat first branch, a 154-waste heat second branch, a 16-first circulating pump, a 17-waste heat bypass regulating valve, a 18-heat storage tank, a 19-waste heat tank heat insulating layer, a 20-second circulating pump, a 21-first check valve, a 22-second check valve, a 23-third circulating pump, a 24-waste heat regulating valve, a 25-waste heat tank, a 26-heat exchanger, a 27-fourth circulating pump, a 29-third power grid user, a power grid control device, a power supply and a power grid, a power supply and a power supply user control system and a 35-user.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Embodiment one:
Natural gas is a clean energy source, and the use of natural gas instead of traditional coal burning technology is a major trend. The natural gas has the advantages of high heat value and good combustion environment, and the situation of using fire coal can be well replaced by burning gaseous natural gas to release energy. For example, a natural gas kiln, which is a kiln using natural gas as fuel, is used in a place where natural gas is used for calcining materials, and can be used for smelting materials such as metal, glass, ceramic and the like. The fuel of the natural gas melting furnace is natural gas with gaseous normal temperature or medium and high temperature, but the raw natural gas from the natural gas long-distance pipeline is in a high-pressure state. At present, the high-pressure natural gas can be introduced into a feed inlet of a natural gas melting furnace for use after being depressurized for a plurality of times.
As shown in fig. 1, the embodiment discloses a natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system, which comprises a natural gas residual pressure power generation subsystem, wherein the natural gas residual pressure power generation subsystem replaces the existing natural gas pressure regulating process. The natural gas residual pressure power generation subsystem firstly utilizes high-pressure natural gas in a long-distance pipeline to generate power, and the high-pressure natural gas is changed into low-pressure natural gas after power generation, and the low-pressure natural gas can be introduced into a natural gas melting furnace to be used as fuel. The natural gas residual pressure power generation subsystem comprises a first expander 2 and a first power generator 4, the first expander 2 drives the first power generator 4, the first expander 2 can utilize high pressure in a high-pressure pipe network to generate power, the pressure energy of natural gas which is lost in the decompression process in a long-distance pipeline is recovered, and the pressure energy is utilized to generate power. The long-distance pipeline of the first expander inlet is provided with a high-pressure natural gas flow regulating valve 1 for regulating the natural gas flow of the first expander inlet. A first speed reducer 3 is also arranged between the output shaft of the first expander 2 and the first generator 4. The first speed reducer 3 is matched with the first generator 4 and is used for generating electricity and surfing the internet. The first expander 2 generates power by using the pressure energy of the natural gas, and the outlet of the first expander is low-temperature low-pressure natural gas, so that the natural gas has the advantages of high heat value and good environment after combustion, and the low-pressure natural gas is introduced into the natural gas melting furnace 8 as fuel.
Before the natural gas at the outlet of the first expander enters the natural gas melting furnace 8, the low-temperature low-pressure natural gas at the outlet of the first expander 2 is raised in temperature by the natural gas reheating heat exchanger 6. The hot side of the natural gas reheating heat exchanger 6 adopts the heat of exhaust gas after combustion in the natural gas melting furnace 8. The exhaust gas of natural gas after combustion in the natural gas melting furnace 8 is exhaust gas, the main components of which are carbon dioxide and water, the exhaust gas still has a higher temperature, and the exhaust gas is discharged to the atmosphere after being treated in the prior art. According to the embodiment, the natural gas reheating heat exchanger 6 is arranged, so that the waste heat of the high-temperature exhaust gas of the natural gas melting furnace 8 is utilized to carry out reheating treatment on the low-temperature low-pressure natural gas after expansion, and the waste heat of the natural gas melting furnace 8 is further utilized.
The process of power generation and waste heat utilization of the natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system comprises the steps that high-pressure natural gas in a high-pressure pipe network is used as a power generation medium to enter a first expander 2, the high-pressure natural gas passes through the first expander 2 and drives a first generator 4 to expand and generate power, and then the outlet of the first expander 2 is low-temperature low-pressure natural gas. The outlet of the first expander 2 is communicated with the cold side inlet of the natural gas reheating heat exchanger 6, the cold side outlet of the natural gas reheating heat exchanger 6 is communicated with the air inlet of the natural gas melting furnace 8, and the hot side of the natural gas reheating heat exchanger 6 utilizes the waste heat of the exhaust gas of the natural gas melting furnace 8, wherein the exhaust gas of the natural gas melting furnace 8 can be directly communicated into the hot side of the natural gas reheating heat exchanger 6. In the natural gas reheating heat exchanger 6, the low-temperature low-pressure natural gas at the outlet of the first expander 2 is heated by the heat at the hot side to be changed into high-temperature low-pressure natural gas, and the expanded low-temperature natural gas meets the use conditions of the melting furnace. Then, the natural gas with high temperature and low pressure enters the natural gas melting furnace 8 to carry out combustion reaction and release heat, the waste gas discharged by the melting furnace is high temperature waste gas after the combustion reaction, the high temperature waste heat is introduced into the hot side of the natural gas reheating heat exchanger 6, the low temperature and low pressure natural gas at the outlet of the first expander 2 is heated by the waste heat, and the natural gas with the temperature increased is introduced into the air inlet of the natural gas melting furnace 8 again, and the reciprocating circulation is carried out. A low-pressure natural gas flow regulating valve 7 is arranged on a pipeline between the cold side outlet of the natural gas reheating heat exchanger 6 and the gas inlet of the natural gas melting furnace 8 and is used for regulating the natural gas flow entering the natural gas melting furnace 8 so as to control the combustion amount of the natural gas melting furnace 8.
As shown in fig. 1, the natural gas at the outlet of the first expander 2 has extremely low temperature and has extremely high recovery value. In this embodiment, a cold energy recovery device 5 is further provided on the line between the outlet of the first expander 2 and the cold side inlet of the natural gas reheat heat exchanger 6. The natural gas inlet of the cold energy recovery device 5 is communicated with the outlet of the first expander 2, the natural gas outlet of the cold energy recovery device 5 is communicated with the cold side inlet of the natural gas reheating heat exchanger 6, and part of cold energy of the expanded natural gas is recovered by the cold energy recovery device 5. Alternatively, the cold energy recovery device 5 may be a natural gas refrigeration unit, an ice maker, or the like.
The structure of the natural gas reheating heat exchanger 6 by utilizing the waste heat of the exhaust gas of the natural gas melting furnace 8 is that the natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system further comprises a waste heat exchanger 10, the hot side of the waste heat exchanger 10 is communicated with the high-temperature exhaust gas of the natural gas melting furnace 8, the cold side of the waste heat exchanger 10 is communicated with the hot side of the natural gas reheating heat exchanger 6, and a first heat storage medium is circulated in a pipeline communicated with the hot side of the natural gas reheating heat exchanger 6 by the cold side of the waste heat exchanger 10. The first heat storage medium uses water, preferably desalted water, and is not easy to scale. The first heat storage medium on the cold side of the waste heat exchanger 10 is heated by the waste heat of the exhaust gas of the natural gas melting furnace 8 by the waste heat exchanger 10, and the first heat storage medium on the hot side of the natural gas reheating heat exchanger 6 is further heated, and the low-temperature and low-pressure natural gas on the cold side of the reheating heat exchanger 6 is reheated on the hot side of the reheating heat exchanger 6. The natural gas reheating device specifically comprises a hot side inlet of a waste heat exchanger 10 communicated with an exhaust port of a natural gas melting furnace 8, a cold side inlet of the waste heat exchanger 10 communicated with a hot side outlet of a natural gas reheating heat exchanger 6, and a cold side outlet of the waste heat exchanger 10 communicated with a hot side inlet of the natural gas reheating heat exchanger 6, wherein heat is provided for the hot side of the natural gas reheating heat exchanger 6 by utilizing high-temperature exhaust gas of the natural gas melting furnace 8 in the waste heat exchanger 10.
Further, in the natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system of the embodiment, due to the arrangement of the waste heat exchanger 10, the warmed first heat storage medium flowing out from the cold side outlet of the waste heat exchanger 10 can also be used for supplying hot water for heating gas of a user. Specifically, the heat storage device further comprises a heat user 34, the cold side outlet of the waste heat exchanger 10 is a first heat storage medium after temperature rise, the cold side outlet of the waste heat exchanger 10 is communicated with the inlet of the heat user 34, and the temperature of the first heat storage medium at the cold side outlet of the waste heat exchanger 10 can be utilized to heat and supply hot water to the heat user 34. Further, the pipe of the cold side outlet of the waste heat exchanger 10 includes a waste heat main flow path 101, a waste heat first branch 103 and a waste heat second branch 104, the waste heat first branch 103 and the waste heat second branch 104 being disposed at the outlet side of the waste heat main flow path 101. The high-temperature first heat storage medium at the cold side outlet of the waste heat exchanger 10 firstly enters the waste heat main flow path, then enters the hot side of the natural gas reheating heat exchanger 6 through the waste heat first branch, and then enters the heat user through the waste heat second branch.
Further, a waste heat bypass flow path 102 is also included, and the waste heat bypass flow path 102 and the waste heat main flow path 101 are connected in parallel. The waste heat storage tank 18 is provided in the waste heat bypass flow path 102. Similarly, the waste heat bypass flow path 102 can be routed to the hot side inlet of the natural gas reheat heat exchanger 6, and also to the heat consumer 34. The outlet of the cold side of the waste heat exchanger 10 is a warmed first heat storage medium, and the warmed first heat storage medium is buffered by the waste heat storage tank 18. The waste heat storage tank 18 is able to continuously meet the heat supply demands of the heat exchange system of the reheat heat exchanger 6 and the user 34 while the system is operating normally, while the waste heat storage tank is also used to store thermal energy. When the equipment is suddenly stopped or started, the heat energy stored in the waste heat storage tank 18 can meet the heat supply/heat exchange requirements of the reheat heat exchanger and a user, so that the normal operation of the system is ensured. The inlet of the waste heat bypass flow path is provided with a waste heat bypass regulating valve 17 for controlling the flow of the waste heat bypass flow path and further controlling the heat storage capacity of the waste heat storage tank. The waste heat storage tank 18 is provided with a waste heat storage tank heat-retaining layer 19 on the outside for preventing heat loss in the tank.
Further, the hot side outlet of the waste heat exchanger 10 is communicated with the tail gas treatment device 11, the hot side inlet of the waste heat exchanger 10 is communicated with the exhaust port of the natural gas melting furnace 8, the exhaust gas of the natural gas melting furnace 8 is a product after natural gas is combusted, the main products after natural gas is carbon dioxide and water, and when oxygen is insufficient, carbon monoxide, carbon dioxide and water can be generated, therefore, the tail gas treatment device 11 is arranged at the hot side outlet of the waste heat exchanger 10 and is used for treating the product after natural gas is combusted. Preferably, the exhaust gas treatment device 11 uses a stack.
Further, the temperature of the heated first heat storage medium is reduced after the heat is released by the heat user 34, and the outlet of the heat user 34 is communicated with the cold side inlet of the waste heat exchanger 10 through the first waste heat branch 341 of the heat user, so that the first heat storage medium with reduced temperature is led back to the cold side inlet of the waste heat exchanger 10 for circulation. The heat consumer first waste heat branch 341 may be directly connected to the cold side inlet line of the waste heat exchanger 10. Alternatively, the waste heat exchanger 10 may be a three-stream heat exchanger, with two being the cold side and one being the hot side. One is the hot side exhaust from the natural gas melter. Two are the cold side, one from the hot side outlet of the natural gas reheat heat exchanger and the other from the outlet of the heat consumer 34 described above. Alternatively, the waste heat exchanger 10 may be selected from two stream heat exchangers, one stream being the hot side and one stream being the cold side, the hot side being the exhaust from the natural gas melter, the cold side of the waste heat exchanger 10 being merged from the hot side outlet of the natural gas reheat heat exchanger and the low temperature first thermal storage medium from the outlet of the hot user 34. Further, the cold side outlet of the waste heat exchanger 10 is provided with a first circulation pump 16, the outlet end of the first circulation pump 16 is divided into a waste heat main flow path and a waste heat bypass flow path, and a second check valve 22 is provided in the waste heat main flow path. A second circulation pump 20 is provided on the outlet line of the waste heat storage tank 18 in the waste heat bypass flow path, and a first check valve 21 is provided at the outlet end of the second circulation pump 20.
Further, the electric cabinet 30 is further included, a first input end of the electric cabinet is electrically connected with the first generator 4, and an output end of the electric cabinet includes a self-power-consumption port and a grid-connected port. The electric energy of the first generator 4 is distributed to the self-powered user and the power grid through the electric cabinet, so that the self-powered electricity consumption is met, and meanwhile, the electric energy generated by the first generator 4 can be supplied to the power grid to bring economic benefits.
Further, the system also comprises a central controller, and the high-pressure natural gas flow regulating valve 1, the natural gas flow regulating valve 7, the waste heat bypass regulating valve 17, the first circulating pump 16, the second circulating pump 20 and the first control port of the electric cabinet are electrically connected with the central controller. The flow of the high-pressure natural gas flow regulating valve 1 is controlled by the central controller, so that the high-pressure natural gas flow entering the first expander in the long-distance pipeline is controlled. The flow of the low-pressure natural gas flow regulating valve 7 is controlled by the central controller, so that the flow of the low-pressure natural gas entering the natural gas melting furnace is controlled. The flow rate of the waste heat bypass regulating valve 17 and thus the flow rate of the waste heat bypass flow path are controlled by the central controller, so that the heat storage amount of the waste heat storage tank is controlled. The opening of the first circulation pump 16 is controlled by the central controller, and the flow rate of the waste heat main flow path is controlled. The opening degree of the second circulation pump 20 is controlled by the central controller, and the amount of hot water flowing out of the waste heat storage tank 18 is controlled. The first control port of the electric cabinet is controlled by the central controller, so that the electric quantity distributed to the self-power-consumption user and the electric quantity supplied to the power grid are controlled. Further, the central controller is a DCS controller or a PLC controller 31, and these two controllers are widely used in engineering.
Embodiment two:
The embodiment provides another coupling and co-supplying system for natural gas residual pressure power generation and a natural gas melting furnace, which comprises the coupling and co-supplying system for natural gas residual pressure power generation and the natural gas melting furnace of the first embodiment, and the same parts as those of the first embodiment are not repeated.
As shown in fig. 2, the natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system of the embodiment further comprises a steam generator 9 on the basis of the first embodiment, and the heat source of the steam generator 9 is waste heat of exhaust gas of the natural gas melting furnace 8. Since the high temperature exhaust gas temperature of the natural gas melting furnace 8 is high, it can be used to provide a heat source for the steam generator 9, heating the water in the steam generator 9 to change it into steam. Therefore, the natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system of the embodiment can also supply steam.
Further, the high temperature exhaust gas temperature of the natural gas melting furnace 8 utilized by the steam generator 9, although reduced, can be used to heat the first thermal storage medium in the cold side of the waste heat exchanger 10 and thus in the hot side of the natural gas reheat heat exchanger 6. The exhaust gases from the natural gas melting furnace 8 first pass through the steam generator 9, and the exhaust gases flowing from the steam generator 9, although having a reduced temperature, have a temperature which is sufficient to provide heat to the hot side of the natural gas reheat heat exchanger 6 through the waste heat exchanger 10. Specifically, the exhaust gas of the natural gas melting furnace 8 flows out of the steam generator 9 and then into the hot side of the waste heat exchanger 10, thereby providing heat for the hot side of the natural gas reheat heat exchanger 6.
Further, the steam generator 9 includes a heat source inlet and a heat source outlet, the heat source inlet being in communication with the heat source outlet. The exhaust port of the natural gas melting furnace 8 is communicated with the heat source inlet of the steam generator 9, and the heat source outlet of the steam generator 9 is communicated with the hot side inlet of the waste heat exchanger 10. Or the exhaust pipe of the furnace extends through the steam generator 9 to provide a source of heat for it.
Further, the natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system further comprises a steam power generation subsystem, the steam power generation subsystem comprises a second expander 12, the steam generator 9 comprises a steam outlet and a liquid return port, the steam outlet is communicated with an inlet of the second expander 12, an outlet of the second expander 12 is communicated with the liquid return port of the steam generator 9, and the steam generator 9 heats water into water vapor by utilizing heat of the natural gas melting furnace 8. The steam flows out from the steam outlet of the steam generator 9, and the water to be heated flows in from the liquid return port of the steam generator 9. The second expander 12 drives the second generator 14, and a second speed reducer 13 is further provided between the output shaft of the second expander 12 and the second generator 14. In the second expander 12, the high-temperature steam is used as a medium to drive the second expander 12 to rotate and drive the second generator 14 to generate electricity. The second expander 12 may be a steam turbine that may generate electricity from steam.
Further, the natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system further comprises a waste heat exchanger 15 and a heat user 34. In the second expander 12, the high-temperature steam is used as a medium to push the second expander 12 to apply work, the outlet of the second expander 12 is a mixture of water vapor and liquid water, and the mixture of water vapor and liquid water still has a certain amount of heat, and the waste heat exchanger 15 is used for providing heat for the heat user 34 by using the mixture of water vapor and liquid water. Specifically, the hot side of the waste heat exchanger 15 is connected between the outlet of the second expander 12 and the liquid return port of the steam generator 9, the cold side inlet of the waste heat exchanger 15 is communicated with the outlet of the heat consumer 34, and the cold side outlet of the waste heat exchanger 15 is communicated with the inlet of the heat consumer 34. The first heat storage medium circulates in a pipeline of the cold side of the waste heat exchanger 15, which is communicated with the heat consumer 34.
Further, the pipeline of the cold side outlet of the waste heat exchanger 15 comprises a waste heat main flow path 151 and a waste heat bypass flow path 152, the waste heat main flow path 151 and the waste heat bypass flow path 152 are connected in parallel, the waste heat bypass flow path 152 is provided with a waste heat storage tank 25, the cold side outlet of the waste heat exchanger 15 is a high-temperature first heat storage medium, and the waste heat storage tank 25 is used for storing the high-temperature first heat storage medium. When the system is in normal operation, the waste heat storage tank can continuously meet the heat supply/exchange requirements of the natural gas reheating heat exchanger 6 and the user 34, and meanwhile, corresponding heat energy is stored in the waste heat storage tank 25 according to the system requirements. When the system is started, when the equipment is suddenly stopped or started, the heat energy stored in the waste heat storage tank can also meet the heat supply/heat exchange requirements of the reheat heat exchanger and a user, so that the normal operation of the system is ensured. Further, a heat-storage tank heat-retaining layer 26 is provided on the outer side of the heat-storage tank 25.
Further, the outlet end of the waste heat main flow path 151 is divided into a waste heat first branch 153 and a waste heat second branch 154. The high-temperature first heat storage medium at the cold side outlet of the waste heat exchanger 15 firstly enters the waste heat main flow path 151, enters the hot side of the natural gas reheating heat exchanger 6 through the waste heat first branch 153, and enters the heat user through the waste heat second branch 154.
Further, in the waste heat bypass flow path 152, a waste heat bypass regulating valve 24 is provided at an inlet end of the waste heat bypass flow path 152, an outlet end of the waste heat bypass regulating valve 24 is communicated with the waste heat storage tank 25, a fourth circulating pump 27 is provided at an outlet end of the waste heat storage tank 25, and a third check valve 28 is provided at an outlet end of the fourth circulating pump 27.
Further, a third circulation pump 23 is provided on a pipe line of the cold side outlet of the waste heat exchanger 15, and an outlet end of the third circulation pump 23 is divided into a waste heat main flow path 151 and a waste heat bypass flow path 152. The waste heat main flow path 151 is provided with a fourth check valve 29.
Further, on the basis of the first embodiment, the electrical cabinet 30 of the present embodiment further includes a second input terminal, and the second input terminal of the electrical cabinet 30 is electrically connected to the second generator 14. The output end of the electric cabinet also comprises a self-power-consumption port and a grid-connected port. The electric energy of the first generator 4 and the second generator 14 is distributed to the self-powered user and the power grid through the electric cabinet, so that the electric energy generated by the first generator 4 can be supplied to the power grid while the self-powered use is met.
Further, on the basis of the first embodiment, the central controller of the present embodiment further includes a fourth circulation pump 27 and a waste heat bypass regulating valve 24, both of which are electrically connected to the central controller. The flow rate of the waste heat bypass control valve 24 and thus the flow rate of the waste heat bypass passage 152 is controlled by the central controller. The flow rate of the fourth circulation pump 27 is controlled by the central controller, and the amount of hot water flowing out of the waste heat storage tank 25 is controlled.
Further, on the basis of the first embodiment, the outlet of the heat consumer 34 further includes a second heat-recovering branch 342 of the heat consumer, and the outlet of the heat consumer is communicated with the cold-side inlet of the heat-recovering heat exchanger 15 through the second heat-recovering branch 342 of the heat consumer, so as to introduce the first heat-accumulating medium with reduced temperature back to the cold-side inlet of the heat-recovering heat exchanger 15 for circulation.
In the embodiment, the natural gas residual pressure power generation subsystem generates power by utilizing the natural gas pressure energy, and the low-pressure natural gas after power generation is combusted and released by using the natural gas melting furnace as fuel. The heat source for the natural gas after expansion is from the high temperature exhaust gas of the natural gas melting furnace. The high-temperature waste gas of the natural gas melting furnace can be used for providing a heat source for the steam generator, and the generated steam can push the second expander of the steam power generation subsystem to generate power. The electric quantity generated by the system can be used in the system, and the residual electric quantity can be used for generating power and connecting with the grid. The waste heat of the natural gas melting furnace and the steam generator can be used for supplying hot water or heating. Through the system of this embodiment, utilize the waste heat after the natural gas burning, improve the efficiency of natural gas electricity generation and heat supply, provided the energy utilization, more high-efficient recycle the pressure energy in the natural gas pipe network than prior art.
Embodiment III:
As shown in fig. 3, this embodiment provides a natural gas residual pressure power generation and natural gas boiler coupling combined supply system, and the natural gas melting furnace 8 and the steam generator 9 of the second embodiment are integrally replaced by a boiler 35, so that the power supply and heat supply can be efficiently performed by using the pressure energy of the natural gas. The same parts of this embodiment as those of the first embodiment and the second embodiment will not be repeated.
The natural gas residual pressure power generation and natural gas boiler coupling combined supply system of this example includes natural gas residual pressure power generation subsystem, and natural gas residual pressure power generation subsystem includes first expander 2 and first generator 4, and first expander 2 drives first generator 4, utilizes the pressure differential in high-pressure pipe network in the high-pressure pipe network and the downstream pipe network through first expander 2 to drive natural gas first expander power generation. The natural gas boiler is a boiler using natural gas as fuel, water or other mediums are arranged in the boiler, the water or other mediums are heated by the natural gas, and if the mediums in the natural gas boiler are water, the natural gas boiler utilizes the natural gas to change the water into high-temperature steam. The high-temperature steam can be used for providing warm or hot water for places such as supermarkets, hospitals, schools and the like, and can also be used in food processing, medical disinfection, brewing and petrochemical production. The exhaust gas of the natural gas boiler 35 is exhaust gas discharged after combustion of natural gas, and is high-temperature waste heat, which is utilized by the natural gas reheat heat exchanger 6. The natural gas reheat heat exchanger 6 is used for performing reheat treatment on the low-temperature and low-pressure natural gas after expansion by using exhaust waste heat of the natural gas boiler 35.
The hot side of the natural gas reheat heat exchanger 6 utilizes the waste heat of the exhaust gas of the natural gas boiler 35 through the waste heat exchanger 10. The hot side inlet of the waste heat exchanger 10 is communicated with the exhaust port of the natural gas boiler 35, the cold side inlet of the waste heat exchanger 10 is communicated with the hot side outlet of the natural gas reheat heat exchanger 6, and the cold side outlet of the waste heat exchanger 10 is communicated with the hot side inlet of the natural gas reheat heat exchanger 6. The first heat storage medium circulates in the pipeline for communicating the cold side of the waste heat exchanger 10 with the hot side of the natural gas reheating heat exchanger 6. In the waste heat exchanger 10, the cold side inlet thereof is low temperature low pressure natural gas at the outlet of the first expander, and the hot side inlet thereof is a first heat storage medium heated by the waste heat of the boiler exhaust gas, and thus, the high temperature exhaust gas of the natural gas boiler 35 is utilized to supply heat to the hot side of the natural gas reheat heat exchanger 6 through the waste heat exchanger 10.
Further, the cold side outlet of the waste heat exchanger is connected with a heat user, and hot water at the cold side outlet of the waste heat exchanger can heat low-temperature and low-pressure natural gas through the hot side of the natural gas reheating heat exchanger, and can also heat or supply hot water for the heat user.
Further, the steam generator subsystem comprises a second expander 12, the boiler 35 comprises a steam outlet and a liquid return port, the steam outlet is communicated with an inlet of the second expander 12, an outlet of the second expander 12 is communicated with the liquid return port of the boiler, and the second expander 12 drives a second generator 14. In the second expander 12, the high-temperature steam of the boiler is used as a medium to drive the second expander 12 to rotate and drive the second generator 14 to generate electricity. Further, a second speed reducer is provided between the output shaft of the second expander 12 and the second generator 14. Further, the second expander 12 is a steam turbine.
In the second expander 12, the high-temperature steam is used as a medium to push the second expander 12 to do work, the outlet of the second expander 12 is the mixture of the water vapor and the liquid water, and the mixture of the water vapor and the liquid water still has a certain amount of heat, and the heat can be used for heating and supplying hot water for a heat user. Specifically, the embodiment further comprises a waste heat exchanger 15 and a heat user 34, wherein the waste heat exchanger 15 is used for providing heat for the heat user 34 by utilizing the mixture of the water vapor and the liquid water. The hot side of the waste heat exchanger 15 is connected between the outlet of the second expander 12 and the liquid return port, the cold side inlet of the waste heat exchanger 15 is communicated with the outlet of the heat user 34, and the cold side outlet of the waste heat exchanger 15 is communicated with the inlet of the heat user 34. The first heat storage medium circulates in a pipeline of which the cold side of the waste heat exchanger 15 is communicated with the heat user 34.
The system of the embodiment also efficiently utilizes the exhaust waste heat of the boiler, and no other auxiliary reheating equipment is required to be arranged during operation, so that the overall efficiency of the combined supply system of the embodiment is further improved.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (21)
1. The natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system is characterized by comprising a natural gas residual pressure power generation subsystem which generates power by utilizing high-pressure natural gas pressure energy, wherein the natural gas residual pressure power generation subsystem comprises a first expander and a first power generator, an inlet of the first expander is connected with a natural gas high-pressure pipe network, and an output shaft of the first expander drives the first power generator to generate power;
the low-pressure natural gas is introduced into the natural gas melting furnace through the cold side of the natural gas reheating heat exchanger to be used as fuel of the natural gas melting furnace, the low-pressure natural gas combusted by the natural gas melting furnace is changed into high-temperature waste gas and is discharged from an exhaust port of the natural gas melting furnace, a heat source at the hot side of the natural gas reheating heat exchanger is from the high-temperature waste gas of the natural gas melting furnace, and the low-pressure natural gas introduced into the natural gas melting furnace is heated in the natural gas reheating heat exchanger by utilizing the heat of the high-temperature waste gas.
2. The coupling and co-supplying system for natural gas residual pressure power generation and a natural gas melting furnace according to claim 1, further comprising a waste heat exchanger, wherein a hot side inlet of the waste heat exchanger is communicated with an exhaust port of the natural gas melting furnace, a cold side of the waste heat exchanger and a hot side of the natural gas reheating heat exchanger form a loop, and a first heat storage medium circulates in the loop;
The first heat storage medium after temperature rising enters the hot side of the natural gas reheating heat exchanger through the loop, exchanges heat with low-temperature natural gas in the cold side of the natural gas reheating heat exchanger, and flows out of the hot side of the natural gas reheating heat exchanger after temperature reduction and enters the cold side inlet of the waste heat exchanger through the loop.
3. The natural gas excess pressure power generation and natural gas melting furnace coupling co-generation system of claim 2, wherein the hot side outlet of the waste heat exchanger is in communication with an exhaust gas treatment device.
4. The natural gas excess pressure power generation and natural gas melting furnace coupling co-generation system of claim 2 further comprising a heat consumer, the cold side outlet of the waste heat exchanger further in communication with the heat consumer.
5. The natural gas after-pressure power generation and natural gas melting furnace coupling co-generation system of claim 4 wherein the outlet of the hot user communicates with the cold side inlet of the waste heat exchanger.
6. The natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system according to claim 2, wherein a cold side outlet of the waste heat exchanger is provided with a waste heat main flow path and a waste heat bypass flow path, the waste heat bypass flow path and the waste heat main flow path are connected in parallel, the cold side outlet of the waste heat exchanger is communicated with a hot side inlet of the natural gas reheating heat exchanger through the waste heat main flow path, and a waste heat storage tank is arranged on the waste heat bypass flow path.
7. The natural gas excess pressure power generation and natural gas melting furnace coupling co-generation system of claim 1 further comprising a steam generator, the heat source of the steam generator also being from the high temperature exhaust gas of the natural gas melting furnace.
8. The natural gas excess pressure power generation and natural gas melting furnace coupling co-generation system of claim 7, further comprising a steam generation subsystem, the steam generation subsystem comprising a second expander;
The steam generator comprises a steam outlet and a liquid return port, the steam outlet is communicated with the inlet of the second expander, the outlet of the second expander is communicated with the liquid return port, and the output shaft of the second expander drives the second generator to generate electricity.
9. The natural gas excess pressure power generation and natural gas melting furnace coupling combined supply system according to claim 8, further comprising a waste heat exchanger and a heat user;
The hot side of the waste heat exchanger is connected between the outlet of the second expansion machine and the liquid return port of the steam generator through a pipeline, the cold side inlet of the waste heat exchanger is communicated with the outlet of the heat user, and the cold side outlet of the waste heat exchanger is communicated with the inlet of the heat user to heat or supply hot water for the heat user;
and a first heat storage medium is circulated in a pipeline of which the cold side of the waste heat exchanger is communicated with the heat user.
10. The natural gas residual pressure power generation and natural gas melting furnace coupling combined supply system according to claim 9, wherein a cold side outlet of the waste heat exchanger is provided with a waste heat main flow path and a waste heat bypass flow path, the waste heat bypass flow path is connected with the waste heat main flow path in parallel, the cold side outlet of the waste heat exchanger is communicated with an inlet of a heat user through the waste heat main flow path, and a waste heat storage tank is arranged on the waste heat bypass flow path.
11. The coupling and co-supplying system for natural gas residual pressure power generation and natural gas melting furnace according to claim 8, further comprising an electrical cabinet, wherein the input end of the electrical cabinet is electrically connected with the first generator and/or the second generator, and the output end of the electrical cabinet is a self-power user and/or a power grid.
12. The natural gas excess pressure power generation and natural gas melting furnace coupling co-supply system according to claims 2,6 and 11, further comprising a central controller;
the long-distance pipeline at the inlet of the first expansion machine is provided with a high-pressure natural gas flow regulating valve, a pipeline between the cold side outlet of the natural gas reheating heat exchanger and the gas inlet of the natural gas melting furnace is provided with a low-pressure natural gas flow regulating valve, the cold side outlet of the waste heat exchanger is provided with a first circulating pump, the inlet of the waste heat bypass flow path is provided with a waste heat bypass regulating valve, and the outlet pipeline of the waste heat storage tank is provided with a second circulating pump;
the control ports of the high-pressure natural gas flow regulating valve, the waste heat bypass regulating valve, the first circulating pump, the second circulating pump and the electric cabinet are all electrically connected with the central controller.
13. The natural gas excess pressure power generation and natural gas melting furnace coupling co-generation system according to claim 12, wherein the central controller is a DCS controller or a PLC controller.
14. The natural gas excess pressure power generation and natural gas melting furnace coupling co-generation system of claim 8, wherein the second expander is a steam turbine.
15. The natural gas excess pressure power generation and natural gas melting furnace coupling co-generation system according to claim 2, wherein the first heat storage medium uses water or heat transfer oil.
16. The natural gas residual pressure power generation and natural gas melting furnace coupling co-generation system according to claim 3, wherein the tail gas treatment device is a chimney.
17. The natural gas excess pressure power generation and natural gas melting furnace coupling co-generation system of claim 1, further comprising a cold energy recovery device disposed between an outlet of the first expander and a cold side inlet of the natural gas reheat heat exchanger.
18. The natural gas residual pressure power generation and natural gas boiler coupling combined supply system is characterized by comprising a natural gas residual pressure power generation subsystem, a natural gas boiler and a natural gas reheating heat exchanger;
The natural gas residual pressure power generation subsystem comprises a first expander and a first power generator, wherein an inlet of the first expander is connected with a natural gas high-pressure pipe network, an outlet of the first expander is communicated with a cold side inlet of the natural gas reheating heat exchanger, and an output shaft of the first expander drives the first power generator to generate power;
and the cold side outlet of the natural gas reheating heat exchanger is communicated with the air inlet of the natural gas boiler, and the hot side of the natural gas reheating heat exchanger utilizes exhaust waste heat of the natural gas boiler.
19. The natural gas excess pressure power generation and natural gas boiler coupling co-generation system of claim 18, further comprising a waste heat exchanger;
The cold side inlet of the waste heat exchanger is communicated with the hot side outlet of the natural gas reheating heat exchanger, the cold side outlet of the waste heat exchanger is communicated with the hot side inlet of the natural gas reheating heat exchanger, and/or the cold side outlet of the waste heat exchanger is connected with a hot user;
and a first heat storage medium circulates in a communication pipeline between the cold side of the waste heat exchanger and the hot side of the natural gas reheating heat exchanger.
20. The natural gas excess pressure power generation and natural gas boiler coupling co-generation system of claim 18, further comprising a steam generator subsystem comprising a second expander and a second generator;
the boiler comprises a steam outlet and a liquid return port, the steam outlet is communicated with the inlet of the second expander, the outlet of the second expander is communicated with the liquid return port, and the output shaft of the second expander drives the second generator to generate electricity.
21. The natural gas excess pressure power generation and natural gas melting furnace coupling co-generation system of claim 20, further comprising a waste heat exchanger and a heat consumer;
The hot side of the waste heat exchanger is connected between the outlet of the second expansion machine and the liquid return port, the cold side inlet of the waste heat exchanger is communicated with the outlet of the heat user, and the cold side outlet of the waste heat exchanger is communicated with the inlet of the heat user;
and a first heat storage medium is circulated in a pipeline of which the cold side of the waste heat exchanger is communicated with the heat user.
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| CN202411174116.7A CN119043033A (en) | 2024-08-26 | 2024-08-26 | Natural gas residual pressure power generation and natural gas melting furnace/boiler coupling combined supply system |
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| CN202411174116.7A CN119043033A (en) | 2024-08-26 | 2024-08-26 | Natural gas residual pressure power generation and natural gas melting furnace/boiler coupling combined supply system |
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