CN113202584A - Gas-air-steam three-working-medium combined cycle power generation system and method - Google Patents
Gas-air-steam three-working-medium combined cycle power generation system and method Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 115
- 239000007789 gas Substances 0.000 claims abstract description 50
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims abstract description 44
- 238000004146 energy storage Methods 0.000 claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims abstract description 22
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000002918 waste heat Substances 0.000 claims abstract description 17
- 238000005057 refrigeration Methods 0.000 claims abstract description 16
- 238000007906 compression Methods 0.000 claims abstract description 14
- 230000006835 compression Effects 0.000 claims abstract description 13
- 239000003345 natural gas Substances 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000003546 flue gas Substances 0.000 claims abstract description 4
- 239000000284 extract Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 11
- 239000003245 coal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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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
- 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
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
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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
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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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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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The invention provides a gas-air-steam three-working-medium combined cycle power generation system and a method. The compressed air energy storage module is connected with the air storage device, and hot medium water in the lithium bromide refrigeration module is used for cooling compression heat; the air heated by the air heater is supplied to the air turbine power generation module by the air storage device to do work for power generation; the gas power generation module utilizes a gas turbine compressor to extract air from the atmosphere for pressurization, enters a combustion chamber to be mixed with natural gas for combustion, then enters a gas turbine for expansion to do work, and drives a gas generator to generate power; the after-combustion type waste heat boiler heats high-pressure and low-pressure feed water of the dual-pressure steam power generation module by utilizing exhaust gas of the gas turbine, then heats air of the air power generation module and condensed water of the dual-pressure steam power generation module after the temperature of flue gas is raised again through the flue after-combustion device, and the dual-pressure steam power generation module drives the steam turbine to generate power by utilizing high-temperature and high-pressure steam generated after the feed water of steam circulation is heated.
Description
Technical Field
The invention relates to a gas-air-steam three-working-medium combined cycle power generation system and method, and belongs to the field of compressed air energy storage.
Background
At present, with the continuous increase of the installed proportion of new energy electric power and the continuous change of domestic economic and social structures, the operation modes of a power grid at a power generation end and a power utilization end are changed deeply, the power generation load and the power utilization load have volatility, randomness and unpredictability, and especially the peak-valley difference of the power utilization load of the power grid at daytime and night is larger and larger in recent years. At present, the condition that the peak regulation of a power grid is singly dependent on a thermal power generating unit is more and more prominent at night, so that the utilization rate of the thermal power generating unit is reduced, the power generation coal consumption is increased, great energy waste is formed, and the service life of the peak regulation unit is greatly damaged.
For a long time, a power grid is provided with a certain proportion of gas generator sets on a power generation side to be used for peak regulation and frequency modulation, and the characteristic of quick start and stop can provide emergency power for the power grid for standby in the daytime. In recent years, the electric power energy storage technology is another important technical direction for solving the problems, and plays an active role in peak clipping and valley filling of a power grid, stabilizing the fluctuation of renewable energy sources, providing emergency power support and the like. Compressed air energy storage power generation is an important direction in the field of large-scale clean physical energy storage, and currently, in the process of rapid development in China, a plurality of non-afterburning compressed air energy storage power stations are in the process of construction in China.
However, both the gas generator set and the pressure sink air energy storage generator set have certain limitations. The operation mode of starting and stopping the gas turbine every day can only provide electric power support in the daytime, and cannot provide help in the power utilization valley period of the power grid at night. And the compressed air energy storage technology which is rapidly developed in a few years can pull electricity from the power grid in the electricity utilization valley period of the electricity utilization network at night and the like, but the electricity generation capacity is lower in the electricity utilization peak period of the electricity utilization network at day and the like, generally does not exceed 100MW, and the power support to the power grid is insufficient.
Disclosure of Invention
The invention aims to provide a gas-air-steam three-working-medium combined cycle power generation system and a method aiming at the existing problems. Because the exhaust heat of the turbine is insufficient, a natural gas afterburner needs to be additionally arranged in a flue of the waste heat boiler, and the temperature of exhaust gas is further raised so as to heat high-pressure compressed air coming out of the air storage device. The heated high-temperature and high-pressure compressed air enters an air turbine to expand and do work, and drives an air turbine generator to generate electricity. By utilizing the air compression module and the combined cycle of the natural gas, the air and the steam, negative load support can be provided for the power grid in the low ebb period, the power generation capacity in the daytime can reach more than 200MW, the power consumed in the energy storage is far exceeded, and the peak power generation capacity is stronger in the power grid in the peak period.
The above purpose is realized by the following technical scheme:
a gas-air-steam three-working-medium combined cycle power generation system comprises a compressed air energy storage module, a lithium bromide refrigeration module, a gas power generation module, a double-pressure steam power generation module, an air turbine power generation module and a afterburning type waste heat boiler; the compressed air energy storage module is connected with the air storage device, and hot medium water in the lithium bromide refrigeration module is used for cooling compression heat; the air heated by the air heater is supplied to the air turbine power generation module by the air storage device to do work for power generation; the gas power generation module utilizes a gas turbine compressor to extract air from the atmosphere for pressurization, enters a combustion chamber to be mixed with natural gas for combustion, then enters a gas turbine for expansion to do work, and drives a gas generator to generate power; the after-combustion type waste heat boiler heats high-pressure and low-pressure feed water of the dual-pressure steam power generation module by utilizing exhaust gas of the gas turbine, then heats air of the air power generation module and condensed water of the dual-pressure steam power generation module after the temperature of flue gas is raised again through the flue after-combustion device, and the dual-pressure steam power generation module drives the steam turbine to generate power by utilizing high-temperature and high-pressure steam generated after the feed water of steam circulation is heated.
The compressed air energy storage module comprises 2-4 sections of air energy storage compressors connected in series, and the interstage of the air energy storage compressors connected in series is provided with a cooler for cooling compression heat.
In the gas-air-steam three-working-medium combined cycle power generation system, the lithium bromide refrigeration module comprises a lithium bromide refrigeration unit, a cold water tank and a hot water tank; and the cold water in the cold water tank enters the interstage cooler for cooling after being pressurized by the cold water delivery pump, and the water from the interstage cooler enters the hot water tank to be used as a heat source of the lithium bromide refrigerating unit.
The gas-air-steam three-working-medium combined cycle power generation system is characterized in that the afterburning type waste heat boiler comprises a high-pressure superheater, a high-pressure evaporator, a high-pressure feed water heater, a low-pressure superheater, a low-pressure evaporator, a flue afterburner, a low-pressure heater, an economizer and a condensate water heater which are sequentially connected with the gas turbine exhaust system in series.
In the gas-air-steam three-working-medium combined cycle power generation system, the dual-pressure steam power generation module comprises a dual-pressure steam turbine, a steam generator, a condenser, a circulating water pump, a condensate pump, a low-pressure water feeding pump and a high-pressure water feeding pump; the exhaust steam of the dual-pressure steam turbine enters a condenser, circulating water conveyed by a circulating water pump is cooled into condensed water, the condensed water is boosted by the condensed water pump and then enters a condensed water heater and an economizer for heating, and then the condensed water is divided into two paths, wherein one path of the condensed water enters a low-pressure water feeding pump, and the other path of the condensed water enters a high-pressure water feeding pump.
The gas-air-steam three-working-medium combined cycle power generation system is characterized in that the air turbine power generation module comprises an air turbine, an air generator and an air heater, the air heater is connected to a flue of the waste heat boiler, the air heater is connected with an air outlet pipe of the air storage device to the air turbine, and the air turbine is a dual-pressure air turbine.
The method for carrying out the gas-air-steam three-working-medium combined cycle power generation by using the gas-air-steam three-working-medium combined cycle power generation system comprises the following steps:
(1) the compressed air energy storage module compresses air through 2-4 stages to ensure that the pressure of compressed air at the outlet of the tail end compressor is 6-14MPa, and the compressed air enters the air storage device for storage after being cooled by the interstage cooler to ensure that the temperature of the compressed air is not higher than 50 ℃;
(2) the flow rate of the compressed air at the outlet of the air storage device is 600-1800t/h, the pressure is 8-12MPa, the temperature is 30-50 ℃, the compressed air is absorbed by the air heater, the temperature is increased to 350-550 ℃, the compressed air enters the air turbine to do work, the exhaust pressure of the air turbine is slightly higher than the atmospheric pressure, the temperature is 80-130 ℃, the compressed air is discharged to the atmosphere through a chimney, and the power generated by the air turbine is 60-200 MW;
(3) the compressor of the gas turbine extracts air from the atmosphere and pressurizes the air to 1.0-3.0MPa, the temperature is raised to 300-. Wherein the flue afterburner raises the temperature after the natural gas and the exhaust gas are mixed and combusted again, heats the high-pressure compressed air, and discharges the air after the final temperature is reduced to 80-130 ℃;
(4) the outlet pressure of the low-pressure feed water pump is 0.5-1.5MPa, the low-pressure feed water is heated by a low-pressure evaporator and a low-pressure superheater respectively to become low-pressure steam, the low-pressure steam pressure is 0.5-1.5MPa, the temperature is 200-300 ℃, and the low-pressure steam enters a low-pressure cylinder of the double-pressure steam turbine; the outlet pressure of the high-pressure feed water pump is 5.0-10.0MPa, the high-pressure feed water pump respectively passes through a high-pressure evaporator and a high-pressure superheater to be heated and then becomes high-pressure steam, the high-pressure steam pressure is 5.0-10.0MPa, the temperature is 300-400 ℃, the high-pressure steam enters a high-pressure cylinder of the double-pressure steam turbine, partial expanded steam in the high-pressure cylinder and low-pressure steam enter a low-pressure cylinder together; the steam which is completely expanded in the low pressure cylinder to do work enters a condenser to be condensed into water to complete a working cycle, and the power generation power of the steam turbine is 50-150 MW.
Has the advantages that:
the invention adopts compressed gas-air-steam three-working-medium combined cycle power generation, and mainly comprises a compressed air energy storage module, a lithium bromide refrigeration module, a gas power generation module, a double-pressure steam power generation module, an air turbine power generation module and a afterburning type waste heat boiler. When the power utilization of the power grid is in a valley period at night, the power is pulled from the power grid to drive the compressor module to store air in the air storage device, heat exchange and heat storage are carried out by using circulating heat medium water, and the heat medium water is used as a heat source of the lithium bromide refrigerating unit. During the electricity utilization peak period of the electricity network such as daytime, the compressor of the gas turbine module is utilized to extract air from the atmosphere for pressurization, the air enters the combustion chamber to be mixed with natural gas for combustion and then enters the turbine for expansion to do work, and the gas generator is driven to generate electricity. The exhaust gas of the gas turbine heats the water supply of the steam cycle in the afterburning type waste heat boiler, so that the water supply is changed into high-temperature and high-pressure steam to drive the steam turbine to generate electricity. Because the exhaust heat of the turbine is insufficient, a natural gas afterburner is arranged in a flue of the waste heat boiler, the temperature of exhaust gas is further raised so as to heat high-pressure compressed air coming out of the gas storage device, the heated high-temperature and high-pressure compressed air enters the air turbine to expand and work, an air turbine generator is driven to generate power, and the compressed air is discharged into the atmosphere after the temperature is reduced.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 1 shows a gas storage device; 2. an air heater; 3. a gas turbine compressor; 4. a combustion chamber; 5. a gas turbine; 6. a gas-fired power generator; 7. a flue afterburner; 8. a steam turbine; 9. an air energy storage compressor; 10. a cooler; 11. a lithium bromide refrigeration unit; 12. a cold water tank; 13. a hot water tank; 14. a high pressure superheater; 15. a high pressure evaporator; 16. a high pressure feedwater heater; 17. a low pressure superheater; 18. a low pressure evaporator; 19. an air generator; 20. a low pressure heater; 21. a coal economizer; 22. a condensed water heater; 23. a steam generator; 24. a condenser; 25. a low pressure feed pump; 26. a high pressure feed pump; 27. an air turbine.
Detailed Description
Example 1:
as shown in fig. 1: the gas-air-steam three-working-medium combined cycle power generation system comprises a compressed air energy storage module, a lithium bromide refrigeration module, a gas power generation module, a double-pressure steam power generation module, an air turbine power generation module and a afterburning type waste heat boiler; the compressed air energy storage module is connected with the air storage device 1,
the hot medium water in the lithium bromide refrigeration module is used for cooling compression heat; the air heated by the air heater 2 is supplied to the air turbine power generation module by the air storage device to do work and generate power; the gas power generation module utilizes a gas turbine compressor 3 to extract air from the atmosphere for pressurization, enters a combustion chamber 4 for mixed combustion with natural gas and then enters a gas turbine 5 for expansion to do work, and drives a gas generator 6 to generate power; the after-combustion type waste heat boiler heats high-pressure and low-pressure feed water of the double-pressure steam power generation module by utilizing exhaust gas of the gas turbine, then heats air of the air power generation module and condensed water of the double-pressure steam power generation module after the temperature of flue gas is raised again through the flue after-combustion device 7, and the double-pressure steam power generation module drives the steam turbine 8 to generate power by utilizing high-temperature and high-pressure steam generated after the feed water of steam circulation is heated.
The compressed air energy storage module comprises 2-4 sections of air energy storage compressors 9 connected in series, and the interstage of the air energy storage compressors connected in series is provided with a cooler 10 for cooling compression heat.
In the gas-air-steam three-working-medium combined cycle power generation system, the lithium bromide refrigeration module comprises a lithium bromide refrigeration unit 11, a cold water tank 12 and a hot water tank 13; and the cold water in the cold water tank enters the interstage cooler for cooling after being pressurized by the cold water delivery pump, and the water from the interstage cooler enters the hot water tank to be used as a heat source of the lithium bromide refrigerating unit.
The gas-air-steam three-working-medium combined cycle power generation system comprises a supplementary combustion type waste heat boiler, a high-pressure superheater 14, a high-pressure evaporator 15, a high-pressure feed water heater 16, a low-pressure superheater 17, a low-pressure evaporator 18, a flue afterburner 7, a low-pressure heater 20, a condensate heater 22 and an economizer 21 which are sequentially connected with a gas turbine exhaust system in series.
In the gas-air-steam three-working-medium combined cycle power generation system, the dual-pressure steam power generation module comprises a dual-pressure steam turbine, a steam generator 23, a condenser 24, a circulating water pump, a condensate pump, a low-pressure water feed pump 25 and a high-pressure water feed pump 26; the exhaust steam of the dual-pressure steam turbine enters a condenser, circulating water conveyed by a circulating water pump is cooled into condensed water, the condensed water is boosted by the condensed water pump and then enters a condensed water heater and an economizer for heating, and then the condensed water is divided into two paths, wherein one path of the condensed water enters a low-pressure water feeding pump, and the other path of the condensed water enters a high-pressure water feeding pump.
In the gas-air-steam three-working-medium combined cycle power generation system, the air turbine power generation module comprises an air turbine 27, an air generator and an air heater 2, the air heater is arranged in a flue of the waste heat boiler, the air heater is connected with an air outlet pipe of the air storage device to the air turbine, and the air turbine is a dual-pressure air turbine.
The method for carrying out the gas-air-steam three-working-medium combined cycle power generation by using the gas-air-steam three-working-medium combined cycle power generation system comprises the following steps:
(1) the compressed air energy storage module compresses air through 2-4 stages to ensure that the pressure of compressed air at the outlet of the tail end compressor is 6-14MPa, and the compressed air enters the air storage device for storage after being cooled by the interstage cooler to ensure that the temperature of the compressed air is not higher than 50 ℃; when storing energy, the compressor compresses air to the air storage device, the air at the low-pressure section of the compressor comes from the exhaust of the air turbine, the compressor is divided into 2-4 sections for compression, the interstage is provided with a cooler for cooling compression heat, and the temperature of the compressed air behind the cooler is reduced, so that the compression electric energy consumption in the low-stage compression process is reduced. The compressed air flow in the compression energy storage process is more than 20 ten thousand meters3H, the compression time lasts for 6 to 8 hours; the cold water in the cold water tank is pressurized by a cold water delivery pump and then enters an inter-stage cooler to cool air at the outlet of each stage of compressor, the cold water is heated into hot water (75-95 ℃) and then stored in a hot water tank to be used as a heat source of the lithium bromide refrigerating unit, and the hot water is delivered to the lithium bromide refrigerating unit by the hot water delivery pump during refrigeration. After heat is released from the lithium bromide refrigerating unit, the heat medium water enters the cold water tank for storage and standby.
(2) The flow rate of the compressed air at the outlet of the air storage device is 600-1800t/h, the pressure is 8-12MPa, the temperature is 30-50 ℃, the compressed air is absorbed by the air heater, the temperature is increased to 350-550 ℃, the compressed air enters the air turbine to do work, the exhaust pressure of the air turbine is slightly higher than the atmospheric pressure, the temperature is 80-130 ℃, the compressed air is discharged to the atmosphere through a chimney, and the power generated by the air turbine is 60-200 MW;
(3) the compressor of the gas turbine extracts air from the atmosphere and pressurizes the air to 1.0-3.0MPa, the temperature is raised to 300-. Wherein the flue afterburner raises the temperature after the natural gas and the exhaust gas are mixed and combusted again, heats the high-pressure compressed air, and discharges the air after the final temperature is reduced to 80-130 ℃;
(4) the outlet pressure of the low-pressure feed water pump is 0.5-1.5MPa, the low-pressure feed water is heated by a low-pressure evaporator and a low-pressure superheater respectively to become low-pressure steam, the low-pressure steam pressure is 0.5-1.5MPa, the temperature is 200-300 ℃, and the low-pressure steam enters a low-pressure cylinder of the double-pressure steam turbine; the outlet pressure of the high-pressure feed water pump is 5.0-10.0MPa, the high-pressure feed water pump respectively passes through a high-pressure evaporator and a high-pressure superheater to be heated and then becomes high-pressure steam, the high-pressure steam pressure is 5.0-10.0MPa, the temperature is 300-400 ℃, the high-pressure steam enters a high-pressure cylinder of the double-pressure steam turbine, partial expanded steam in the high-pressure cylinder and low-pressure steam enter a low-pressure cylinder together; the steam which is completely expanded in the low pressure cylinder to do work enters a condenser to be condensed to complete a working cycle, and the power generation power of the steam turbine is 50-150 MW.
The technical means disclosed by the scheme of the invention are not limited to the technical means disclosed by the technical means, and also comprise the technical scheme formed by equivalent replacement of the technical features. The present invention is not limited to the details given herein, but is within the ordinary knowledge of those skilled in the art.
Claims (7)
1. A gas-air-steam three-working-medium combined cycle power generation system comprises a compressed air energy storage module, a lithium bromide refrigeration module, a gas power generation module, a double-pressure steam power generation module, an air turbine power generation module and a afterburning type waste heat boiler; the method is characterized in that: the compressed air energy storage module is connected with the air storage device, and hot medium water in the lithium bromide refrigeration module is used for cooling compression heat; the air heated by the air heater is supplied to the air turbine power generation module by the air storage device to do work for power generation; the gas power generation module utilizes a gas turbine compressor to extract air from the atmosphere for pressurization, enters a combustion chamber to be mixed with natural gas for combustion, then enters a gas turbine for expansion to do work, and drives a gas generator to generate power; the after-combustion type waste heat boiler heats high-pressure and low-pressure feed water of the dual-pressure steam power generation module by utilizing exhaust gas of the gas turbine, then heats air of the air power generation module and condensed water of the dual-pressure steam power generation module after the temperature of flue gas is raised again through the flue after-combustion device, and the dual-pressure steam power generation module drives the steam turbine to generate power by utilizing high-temperature and high-pressure steam generated after the feed water of steam circulation is heated.
2. The gas-air-steam three-working-medium combined cycle power generation system of claim 1, wherein: the compressed air energy storage module comprises 2-4 sections of air energy storage compressors connected in series, and a cooler is arranged between stages of the air energy storage compressors connected in series to cool compression heat.
3. The gas-air-steam three-working-medium combined cycle power generation system of claim 1, wherein: the lithium bromide refrigeration module comprises a lithium bromide refrigeration unit, a cold water tank and a hot water tank; and the cold water in the cold water tank enters the interstage cooler for cooling after being pressurized by the cold water delivery pump, and the water from the interstage cooler enters the hot water tank to be used as a heat source of the lithium bromide refrigerating unit.
4. The gas-air-steam three-working-medium combined cycle power generation system of claim 1, wherein: the after-combustion type waste heat boiler comprises a high-pressure superheater, a high-pressure evaporator, a high-pressure feed water heater, a low-pressure superheater, a low-pressure evaporator, a flue after-combustion device, a low-pressure heater, an economizer and a condensate water heater which are sequentially connected with the gas turbine exhaust system in series.
5. The gas-air-steam three-working-medium combined cycle power generation system of claim 1, wherein: the dual-pressure steam power generation module comprises a dual-pressure steam turbine, a steam generator, a condenser, a circulating water pump, a condensate pump, a low-pressure water feeding pump and a high-pressure water feeding pump; the exhaust steam of the dual-pressure steam turbine enters a condenser, circulating water conveyed by a circulating water pump is cooled into condensed water, the condensed water is boosted by the condensed water pump and then enters a condensed water heater and an economizer for heating, and then the condensed water is divided into two paths, wherein one path of the condensed water enters a low-pressure water feeding pump, and the other path of the condensed water enters a high-pressure water feeding pump.
6. The gas-air-steam three-working-medium combined cycle power generation system of claim 1, wherein: the air turbine power generation module comprises an air turbine, an air generator and an air heater, the air heater is connected to a flue of the waste heat boiler, the air heater is connected with an air outlet pipe of the air storage device to the air turbine, and the air turbine is a dual-pressure air turbine.
7. A method for carrying out gas-air-steam three-working-medium combined cycle power generation by using the gas-air-steam three-working-medium combined cycle power generation system is characterized by comprising the following steps: the method comprises the following steps:
(1) the compressed air energy storage module compresses air through 2-4 stages to ensure that the pressure of compressed air at the outlet of the tail end compressor is 6-14MPa, and the compressed air enters the air storage device for storage after being cooled by the interstage cooler to ensure that the temperature of the compressed air is not higher than 50 ℃;
(2) the flow rate of the compressed air at the outlet of the air storage device is 600-1800t/h, the pressure is 8-12MPa, the temperature is 30-50 ℃, the compressed air is absorbed by the air heater, the temperature is increased to 350-550 ℃, the compressed air enters the air turbine to do work, the exhaust pressure of the air turbine is slightly higher than the atmospheric pressure, the temperature is 80-130 ℃, the compressed air is discharged to the atmosphere through a chimney, and the power generated by the air turbine is 60-200 MW;
(3) the compressor of the gas turbine extracts air from the atmosphere and pressurizes the air to 1.0-3.0MPa, the temperature is raised to 300-;
wherein the flue afterburner raises the temperature after the natural gas and the exhaust gas are mixed and combusted again, heats the high-pressure compressed air, and discharges the air after the final temperature is reduced to 80-130 ℃;
(4) the outlet pressure of the low-pressure feed water pump is 0.5-1.5MPa, the low-pressure feed water is heated by a low-pressure evaporator and a low-pressure superheater respectively to become low-pressure steam, the low-pressure steam pressure is 0.5-1.5MPa, the temperature is 200-300 ℃, and the low-pressure steam enters a low-pressure cylinder of the double-pressure steam turbine; the outlet pressure of the high-pressure feed water pump is 5.0-10.0MPa, the high-pressure feed water pump respectively passes through a high-pressure evaporator and a high-pressure superheater to be heated and then becomes high-pressure steam, the high-pressure steam pressure is 5.0-10.0MPa, the temperature is 300-400 ℃, the high-pressure steam enters a high-pressure cylinder of the double-pressure steam turbine, partial expanded steam in the high-pressure cylinder and low-pressure steam enter a low-pressure cylinder together; the steam which is completely expanded in the low pressure cylinder to do work enters a condenser to be condensed into water to complete a working cycle, and the power generation power of the steam turbine is 50-150 MW.
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