CN114087047B - CCPP power plant fuel gas backflow energy recovery system and method - Google Patents
CCPP power plant fuel gas backflow energy recovery system and method Download PDFInfo
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- CN114087047B CN114087047B CN202111289823.7A CN202111289823A CN114087047B CN 114087047 B CN114087047 B CN 114087047B CN 202111289823 A CN202111289823 A CN 202111289823A CN 114087047 B CN114087047 B CN 114087047B
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- energy recovery
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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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/22—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being gaseous at standard temperature and pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
- F02C7/232—Fuel valves; Draining valves or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
- F02C9/28—Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to a system and a method for recovering energy of gas backflow of a CCPP power plant, comprising a first load control device, a first energy recovery module, a first generator, a second load control device, a second energy recovery module and a second generator; the residual high-temperature high-pressure gas of the coal press is also connected to the input end of the first energy recovery module after passing through the first load control device, the output end of the first energy recovery module is connected to the first generator, the high-temperature high-pressure gas is also connected to the input end of the second energy recovery module after passing through the second load control device, and the output end of the second energy recovery module is connected to the second generator. The normal-temperature low-pressure coal gas at the outlets of the first energy recovery module and the second energy recovery module is connected to the coal gas cooler. The energy recovery device is used for generating electricity and simultaneously reducing pressure and temperature of high-temperature high-pressure gas to replace the original pressure reducing valve and water spraying device. And recovering energy in the reflux gas in the process of reducing pressure and temperature, and converting the energy into electric energy.
Description
Technical Field
The invention relates to the technical field of energy recovery and power generation, in particular to a system and a method for recovering gas backflow energy of a CCPP power plant.
Background
In CCPP gas power plants, because the amount of compressed gas of the coal press is fixed, when the load of the gas engine is adjusted, a large amount of high-temperature and high-pressure gas from the outlet of the coal press cannot be used by the gas engine, and needs to flow back to the low-pressure gas pipeline, and the gas is returned to the low-pressure gas pipeline after passing through the pressure reducing valve and then being cooled by water spraying. The high-temperature high-pressure gas consumes a large amount of coal press power, and flows back after being subjected to temperature reduction and pressure reduction through the valve and the water spray, so that a large amount of energy is lost by white. This problem is also the main cause of the significant decrease in power generation efficiency of CCPP units when the load is reduced.
Disclosure of Invention
In order to solve the technical problems of the background technology, the invention provides a gas backflow energy recovery system and method for a CCPP power plant, which are provided with a set of energy recovery device, the energy recovery device is used for generating electricity, and meanwhile, the high-temperature high-pressure gas is decompressed and cooled to replace an original decompression valve and a water spraying device. And recovering energy in the reflux gas in the process of reducing pressure and temperature, and converting the energy into electric energy.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the gas backflow energy recovery system of the CCPP power plant comprises a coal press, wherein high-temperature and high-pressure gas output by the coal press is connected to a gas engine, and the rest high-temperature and high-pressure gas is connected to a gas cooler through a gas pressure reducing valve.
The system also comprises a first load control device, a first energy recovery module, a first generator, a second load control device, a second energy recovery module and a second generator; the residual high-temperature high-pressure gas of the coal press is also connected to the input end of the first energy recovery module after passing through the first load control device, the output end of the first energy recovery module is connected to the first generator, and the normal-temperature low-pressure gas at the outlet of the first energy recovery module is connected to the gas cooler; the residual high-temperature high-pressure gas of the coal press is also connected to the input end of the second energy recovery module after passing through the second load control device, the output end of the second energy recovery module is connected to the second generator, and the normal-temperature low-pressure gas at the outlet of the second energy recovery module is connected to the gas cooler.
The first load control device and the second load control device are controlled by the GTC load control center, and the opening and the closing are automatically controlled according to the load of the combustion engine.
The high-temperature high-pressure gas expands in the first energy recovery module and the second energy recovery module to do work, and the high-temperature high-pressure gas is changed into normal-temperature low-pressure gas, and power generation is performed at the same time.
The energy recovery method of the CCPP power plant fuel gas backflow energy recovery system comprises the following steps:
1) The residual high-temperature and high-pressure fuel gas of the coal press is subjected to depressurization and cooling after passing through the first energy recovery module and the second energy recovery module, and energy is recovered to generate electricity;
2) When the load of the fuel engine is 75% -95%, the first load control device is opened, and the first energy recovery module is started to generate electricity;
3) When the load of the fuel engine is 55% -75%, the second load control device is opened, the second energy recovery module is started, and the first energy recovery module and the second energy recovery module run simultaneously to generate electricity;
4) If the load of the gas turbine is lower than 55%, the redundant gas flows back through the original gas pressure reducing valve.
Compared with the prior art, the invention has the beneficial effects that:
in a CCPP gas power plant in the prior art, no energy recovery device is arranged in the backflow of high-temperature high-pressure gas of a coal press, the energy recovery device is arranged to generate electricity, and meanwhile, the high-temperature high-pressure gas is decompressed and cooled to replace an original decompression valve and a water spraying device. And recovering energy in the reflux gas in the process of reducing pressure and temperature, and converting the energy into electric energy.
Drawings
FIG. 1 is an overall block diagram of a CCPP power plant fuel gas return energy recovery system of the present invention;
in the figure: 1-first load control device 2-first energy recovery module 3-first generator 4-second load control device 5-second energy recovery module 6-second generator.
Detailed Description
The following detailed description of the embodiments of the invention is provided with reference to the accompanying drawings.
As shown in fig. 1, a gas backflow energy recovery system of a CCPP power plant comprises a coal press, wherein high-temperature and high-pressure gas output by the coal press is connected to a gas engine, and the rest high-temperature and high-pressure gas is connected to a gas cooler through a gas pressure reducing valve.
The system also comprises a first load control device 1, a first energy recovery module 2, a first generator 3, a second load control device 4, a second energy recovery module 5 and a second generator 6; the residual high-temperature high-pressure gas of the coal press is also connected to the input end of the first energy recovery module 2 after passing through the first load control device 1, the output end of the first energy recovery module 2 is connected to the first generator 3, and the normal-temperature low-pressure gas at the outlet of the first energy recovery module 2 is connected to the gas cooler; the residual high-temperature high-pressure gas of the coal press is also connected to the input end of a second energy recovery module 5 after passing through a second load control device 4, the output end of the second energy recovery module 5 is connected to a second generator 6, and the normal-temperature low-pressure gas at the outlet of the second energy recovery module 5 is connected to a gas cooler.
The first load control device 1 and the second load control device 4 are controlled by a GTC load control center, and are automatically controlled to be opened and closed according to the load of the fuel engine.
The high-temperature high-pressure gas expands in the first energy recovery module 2 and the second energy recovery module 5 to do work, and the high-temperature high-pressure gas is changed into normal-temperature low-pressure gas, and power generation is performed at the same time.
The energy recovery method of the CCPP power plant fuel gas backflow energy recovery system comprises the following steps:
1) The rest high-temperature and high-pressure fuel gas of the coal press is subjected to depressurization and cooling after passing through the first energy recovery module 2 and the second energy recovery module 5, and energy is recovered to generate electricity;
2) When the load of the fuel engine is 75% -95%, the first load control device 1 is opened, and the first energy recovery module 2 is started to generate electricity;
3) When the load of the gas engine is 55% -75%, the second load control device 4 is opened, the second energy recovery module 5 is started, and at the moment, the first energy recovery module 2 and the second energy recovery module 5 run simultaneously to generate electricity;
4) If the load of the gas turbine is lower than 55%, the redundant gas flows back through the original gas pressure reducing valve.
The expected effect of the invention is as follows: taking 180 MW-level low-heating-value CCPP units as an example: compressed gas volume of coal press is about 350000Nm 3 And/h, temperature of compressed fuel gas: 415 ℃, pressure: 2.0MPa, about 50000Nm when the unit is operated at 85% load 3 And/h, the fuel gas flows back to the pipe network, and the energy recovery module is adopted to recover the electric energy: 5MW.
The above examples are implemented on the premise of the technical scheme of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the above examples. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (2)
1. The energy recovery method of a CCPP power plant fuel gas backflow energy recovery system comprises a coal press, wherein high-temperature high-pressure coal gas output by the coal press is connected to a fuel engine, and a first path of the residual high-temperature high-pressure coal gas is connected to a coal gas cooler through a coal gas pressure reducing valve;
the system also comprises a first load control device, a first energy recovery module, a first generator, a second load control device, a second energy recovery module and a second generator; the second path of the residual high-temperature high-pressure gas of the coal press is connected to the input end of the first energy recovery module after passing through the first load control device, the output end of the first energy recovery module is connected to the first generator, and the normal-temperature low-pressure gas at the outlet of the first energy recovery module is connected to the gas cooler; the third path of the residual high-temperature high-pressure gas of the coal press is connected to the input end of a second energy recovery module after passing through a second load control device, the output end of the second energy recovery module is connected to a second generator, and the normal-temperature low-pressure gas at the outlet of the second energy recovery module is connected to a gas cooler;
the first load control device and the second load control device are controlled by a GTC load control center and automatically control opening and closing according to the load of the combustion engine;
the energy recovery method is characterized by comprising the following steps:
1) The residual high-temperature and high-pressure coal gas of the coal press is subjected to depressurization and cooling after passing through the first energy recovery module and the second energy recovery module, and energy is recovered to generate electricity;
2) When the load of the fuel engine is 75% -95%, the first load control device is opened, and the first energy recovery module is started to generate electricity;
3) When the load of the gas engine is 55% -75%, the second load control device is turned on, the second energy recovery module is started, and at the moment, the first energy recovery module and the second energy recovery module operate simultaneously to generate electricity;
4) If the load of the gas turbine is lower than 55%, the redundant gas flows back through the original gas pressure reducing valve.
2. The energy recovery method of the CCPP power plant gas backflow energy recovery system of claim 1, wherein the high-temperature high-pressure gas expands in the first energy recovery module and the second energy recovery module to do work, and the high-temperature high-pressure gas is changed into normal-temperature low-pressure gas, and power generation is performed at the same time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111289823.7A CN114087047B (en) | 2021-11-02 | 2021-11-02 | CCPP power plant fuel gas backflow energy recovery system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111289823.7A CN114087047B (en) | 2021-11-02 | 2021-11-02 | CCPP power plant fuel gas backflow energy recovery system and method |
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| Publication Number | Publication Date |
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| CN114087047A CN114087047A (en) | 2022-02-25 |
| CN114087047B true CN114087047B (en) | 2023-09-19 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08121699A (en) * | 1994-10-18 | 1996-05-17 | Osaka Gas Co Ltd | Pressure governor device for high pressure gas |
| JP2007023976A (en) * | 2005-07-21 | 2007-02-01 | Chugoku Electric Power Co Inc:The | Gas turbine generator and gas turbine combined-cycle power generation system |
| CN202328161U (en) * | 2011-10-21 | 2012-07-11 | 武汉钢铁(集团)公司 | Three-stage gas cooling device of gas turbine generator set |
| CN103184987A (en) * | 2011-12-31 | 2013-07-03 | 新奥科技发展有限公司 | Mobile energy supply equipment based on compressed natural gas |
| JP2015175298A (en) * | 2014-03-14 | 2015-10-05 | 株式会社東芝 | Combined cycle power generation arrangement |
| CN105443244A (en) * | 2015-11-13 | 2016-03-30 | 武汉钢铁(集团)公司 | Fuel gas-steam combined cycle power generator set two-stage coal gas pressurization system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105003351B (en) * | 2015-07-21 | 2016-08-17 | 天津大学 | Gas machine waste heat energy is carried out the energy tower of the multi-energy form output of step recovery |
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2021
- 2021-11-02 CN CN202111289823.7A patent/CN114087047B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08121699A (en) * | 1994-10-18 | 1996-05-17 | Osaka Gas Co Ltd | Pressure governor device for high pressure gas |
| JP2007023976A (en) * | 2005-07-21 | 2007-02-01 | Chugoku Electric Power Co Inc:The | Gas turbine generator and gas turbine combined-cycle power generation system |
| CN202328161U (en) * | 2011-10-21 | 2012-07-11 | 武汉钢铁(集团)公司 | Three-stage gas cooling device of gas turbine generator set |
| CN103184987A (en) * | 2011-12-31 | 2013-07-03 | 新奥科技发展有限公司 | Mobile energy supply equipment based on compressed natural gas |
| JP2015175298A (en) * | 2014-03-14 | 2015-10-05 | 株式会社東芝 | Combined cycle power generation arrangement |
| CN105443244A (en) * | 2015-11-13 | 2016-03-30 | 武汉钢铁(集团)公司 | Fuel gas-steam combined cycle power generator set two-stage coal gas pressurization system |
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| CN114087047A (en) | 2022-02-25 |
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