CN111075671B - Coupling integrated solar energy, supercritical carbon dioxide and compressed air energy storage power generation system - Google Patents
Coupling integrated solar energy, supercritical carbon dioxide and compressed air energy storage power generation system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
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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
- F01D15/08—Adaptations for driving, or combinations with, pumps
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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
- F01K25/10—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 the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/10—Combinations of wind motors with apparatus storing energy
- F03D9/17—Combinations of wind motors with apparatus storing energy storing energy in pressurised fluids
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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
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a power generation system integrating solar energy, supercritical carbon dioxide and compressed air energy storage in a coupling manner, which comprises supercritical CO coupled with the solar energy2In the Brayton cycle power generation subsystem, the system comprises sequentially coupled CO2Turbine, CO2Compressor train, CO2The system generator and the compressed air energy storage subsystem coupled with the solar energy comprise an air compressor set and a motor which are connected by a shaft; coupled CO2Turbine, CO2Compressor train, CO2CO of system generator2The shaft end of the system generator is in shaft connection with an SSS clutch, and the SSS clutch is in shaft connection with the shaft ends of an air compressor unit connected with the shaft and an air compressor unit of the motor. The system can absorb new energy, reduce the wind and light abandoning rate, provide a stable power supply and have the capacity of peak clipping and valley filling; simultaneously, the supercritical CO is used for the development and utilization of wind and light resources2The comprehensive application of Brayton cycle and compressed air energy storage provides a new idea.
Description
Technical Field
The invention belongs to the technical field of new energy power generation, and relates to a power generation system for coupling and integrating solar energy, supercritical carbon dioxide and compressed air energy storage.
Background
At present, the problems of fossil energy shortage and environmental deterioration are increasingly prominent, and the development and utilization of renewable energy sources on a large scale and the improvement of the consumption of clean energy sources become important choices and inevitable trends in the development of energy industry. Solar energy and wind energy have the characteristics of being most widely distributed, abundant in resources, clean and pollution-free, and are the key points for developing and utilizing renewable energy sources. The wind power is a main mode for large-scale development of wind energy, and the solar power generation technology mainly adopts photovoltaic, photo-thermal and other modes. However, due to the defects of instability and intermittence of solar energy and wind energy, the comprehensive development and utilization of the solar energy and the wind energy have certain bottlenecks, and are mainly reflected in the influences on the dispatching, the operation mode, the reliability and the electric energy quality of a power grid. Therefore, the utilization rate of wind energy and solar energy is low, the phenomena of wind abandonment and light abandonment are serious, and the development and utilization of renewable energy sources are hindered.
The energy storage system stores electric energy in a certain energy form through a certain medium, and releases the stored energy to convert the stored energy into the electric energy when needed. Compared with a pumped storage power station, compressed air energy storage has the characteristics of small investment risk, higher maturity, high system circulation efficiency, safety, environmental protection and the like, and large-scale commercial operation is realized. The advanced heat insulation compressed air energy storage system can utilize waste heat and domestic waste heat of industries such as solar heat, electric power, chemical engineering and the like as external heat sources of the energy storage system, and the overall circulation efficiency is up to 70%. With the large-scale development and utilization of renewable energy sources, the energy storage system needs to be connected with a solar power generation system and a wind power generation system so as to adjust the output of the unit and solve the problem of impact of instability and intermittence of the renewable energy sources on a power grid.
Carbon dioxide (CO)2) Due to the characteristics of high density, small compressibility, good stability, no toxicity, rich resources, natural existence, environmental friendliness and the like near critical points (31.1 ℃, 7.39MPa), the composite material is circularly considered to have good application prospects in the fields of fossil energy power generation, nuclear energy power generation, light-concentrating solar thermal power generation, waste heat power generation, geothermal power generation and the like. Supercritical CO2The density is large and no phase change occurs within a certain operating parameter range, the heat exchange matching is good, and the heat exchange efficiency is improved; simultaneously, supercritical CO is used2The power system equipment such as a compressor, a turbine and the like for working media has compact structure, small volume and long service life. Supercritical CO2The Brayton cycle solar heat storage system can improve the temperature of a turbine inlet to be over 600 ℃, and compared with a traditional steam Rankine cycle power generation system, the whole power generation system has higher power generation efficiency which can be over 50 percent. However, higher turbine inlet temperatures place higher demands on the heat storage technology.
Disclosure of Invention
The technical problem solved by the invention is as follows: the power generation system for coupling and integrating solar energy, supercritical carbon dioxide and compressed air energy storage is provided, can absorb new energy, reduces the wind and light abandoning rate, provides a stable power supply, and has the capacity of peak clipping and valley filling; simultaneously, the supercritical CO is used for the development and utilization of wind and light resources2The comprehensive application of Brayton cycle and compressed air energy storage provides a new idea.
The technical scheme adopted by the invention is as follows:
a power generation system integrating solar energy, supercritical carbon dioxide and compressed air energy storage comprises supercritical CO coupled with solar energy2A Brayton cycle power generation subsystem and a compressed air energy storage subsystem coupling solar energy, supercritical CO coupling solar energy2The Brayton cycle power generation subsystem comprises sequentially coupled CO2Turbine, CO2Compressor train, CO2The system generator is characterized in that the compressed air energy storage subsystem coupled with the solar energy comprises an air compressor set and a motor which are connected through a shaft; coupled CO2Turbine, CO2Compressor train, CO2System hairCO of electric machine2The shaft end of the system generator is in shaft connection with an SSS clutch, and the SSS clutch is in shaft connection with the shaft ends of an air compressor unit connected with the shaft and an air compressor unit of the motor.
Preferably, the CO is2The compressor comprises CO2Main compressor and CO2Then compressing the mixture; the air compressor comprises a first-stage air compressor and a second-stage air compressor.
Preferably, the solar-coupled supercritical CO2The Brayton cycle power generation subsystem comprises sequentially coupled COs2Turbine, CO2 recompressor, CO2 main compressor, CO2A system generator; the CO is2Turbine exhaust CO2The medium exchanges heat through a high-temperature heat regenerator and a low-temperature heat regenerator in sequence, the heat exchanged is divided into two branches, one branch flows into CO after being cooled by a cooler2The other path of the main compressor directly flows into CO through a control valve2Then compressing the mixture; CO22CO at the outlet of the main compressor2The medium passes through a low-temperature heat regenerator and then is mixed with CO2CO of recompressor2The medium is converged and enters a high-temperature heat exchanger, and then enters CO after being heated by the heat medium of a heat regenerator2The turbine expands to do work.
Preferably, the compressed air energy storage subsystem coupled with solar energy comprises an energy storage assembly: the air conditioner comprises a first-stage air compressor, a second-stage air compressor, a motor, a No. 1 intercooler and a No. 2 intercooler which are sequentially coupled in a shaft manner; the air medium sequentially passes through the first-stage air compressor, the No. 1 intercooler and the second-stage air compressor, and the No. 2 intercooler is compressed and cooled and enters the air storage device through the control valve III;
the compressed air energy storage subsystem coupled with the solar energy further comprises an energy release assembly: the system comprises a first-stage air turbine, a second-stage air turbine, a compressed air generator, a No. 1 heat exchanger and a No. 2 heat exchanger which are sequentially connected in a shaft manner; the high-pressure air medium released by the air storage device passes through the No. 1 heat exchanger, the first-stage air turbine expansion working, the No. 2 heat exchanger and the second-stage air turbine expansion working through the control valve IV and is finally discharged through the control valve V.
Preferably, the compressed air energy storage subsystem coupled with the solar energy further comprises a cold storage device and a heat storage device, a cooling medium of the cold storage device passes through the No. 2 intercooler and the No. 1 intercooler respectively through the No. 1 medium pump, and enters the heat storage device after heat exchange of the cooling medium through the No. 2 intercooler and the No. 1 intercooler; the heat medium of the heat storage device respectively passes through the heat exchanger No. 1 and the heat exchanger No. 2, and the heat medium enters the cold storage device through the medium pump No. 2 after passing through the heat exchanger No. 1 and the heat exchanger No. 2 for heat exchange.
Preferably, the coupling integration solar energy and supercritical CO2And the compressed air energy storage power generation system also comprises a solar heat collection/storage device, wherein a heat medium in the heat regenerator is subjected to heat exchange and then is input into the solar heat collection/storage device through a seventh control valve, and is heated by the solar heat collection/storage device and then is input into the heat regenerator through a ninth control valve.
Preferably, the heat medium in the heat storage device exchanges heat and then is input into the solar heat collection/storage device through the control valve six, and is heated by the solar heat collection/storage device and then is input into the heat storage device through the control valve eight.
Preferably, the air medium after the second stage air turbine in the compressed air energy storage subsystem coupled with the solar energy expands and does work is circulated to the supercritical CO coupled with the solar energy through a control valve II2And a heat regenerator of the Brayton cycle power generation subsystem recovers waste heat.
Preferably, the heat medium in the regenerator, the cooling medium in the cold storage device, and the heat medium in the heat storage device are all air media.
The invention discloses a coupling integrated solar energy and supercritical CO2And a compressed air energy storage power generation system comprising supercritical CO coupled solar energy2The system comprises a Brayton cycle power generation subsystem and a compressed air energy storage subsystem coupled with solar energy. The energy is converted and stored by compressing air through the air compressor by comprehensively utilizing wind power, solar energy and low-load power grid electric energy, high-pressure air is heated through the heat exchanger and then drives the turbine to expand to do work and generate power in the energy release stage, and heat generated by the solar heat collection system is automatically distributed to supercritical CO according to the demand2Brayton cycle subsystemAnd a compressed air energy storage subsystem for supercritical CO2The power of the Brayton cycle subsystem can directly drive the compressed air to store energy, and the air waste heat medium of the compressed air energy storage system can be recovered to supercritical CO2In the heat regenerator of the Brayton cycle subsystem, the efficiency of the whole system is improved.
The invention discloses a coupling integrated solar energy and supercritical CO2And compressed air energy storage power generation system including supercritical CO coupled with solar energy2Brayton cycle power generation subsystem and compressed air energy storage subsystem coupled with solar energy, and solar energy, compressed air energy storage system and supercritical CO are integrated comprehensively2The Brayton cycle power generation system has the advantages that by means of absorbing the low-ebb electricity and the unstable and intermittent wind energy and solar energy, the low-ebb electricity, the wind energy and the solar energy are converted into heat energy and kinetic energy to drive the rotary power device to generate electricity, the efficiency of the system is improved, a stable power supply is provided, the requirements of quick response of load change of a power grid and load shifting of peak clipping and valley filling are met, and meanwhile, a new idea is provided for absorption of the wind energy and the solar energy and application of the supercritical carbon dioxide Brayton cycle.
The invention has the beneficial effects that the supercritical CO of solar energy and solar energy is integrated through coupling2The system can improve the new energy consumption capability and the peak load and valley filling capability of a new energy intervening power grid, and has better environmental benefits.
Drawings
FIG. 1 is a schematic structural view of the present invention.
Wherein, the names corresponding to the reference numbers are:
1-CO2system Generator, 2-CO2Main compressor, 3-CO2Recompressor, 4-CO2The system comprises a turbine, 5-a solar heat collecting/storing device, 6-a heat regenerator, 7-a high-temperature heat exchanger, 8-a low-temperature heat exchanger, 9-a cooler, 10-an SSS clutch, 11-a first-stage air compressor, 12-a second-stage air compressor, 13-a motor, 14-a No. 1 intercooler, 15-a No. 2 intercooler, 16-a cold storage device, 17-a cold storage device, 18-a heat storage device and 19-a first heat storage deviceThe system comprises a stage air turbine, a 20-second stage air turbine, a 21-heat exchanger, a 22-2 heat exchanger, a 23-compressed air generator, a f 1-control valve I, a f 2-control valve II, a f 3-control valve III, a f 4-control valve IV, a f 5-control valve V, a f 6-control valve VI, a f 7-control valve VII, a f 8-control valve eight, a f 9-control valve nine and a 101-supercritical CO2Brayton cycle power generation subsystem, 102-compressed air energy storage subsystem.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Examples
Coupling integrated solar energy and supercritical CO2And a compressed air energy storage power generation system, as shown in FIG. 1, comprising supercritical CO coupled with solar energy2A Brayton cycle power generation subsystem 101 and a compressed air energy storage subsystem 102 coupling solar energy, supercritical CO coupling solar energy2The Brayton cycle power generation subsystem 101 includes sequentially coupled COs2Turbine 4, CO2Compressor train, CO2The system generator 1 is provided with a compressed air energy storage subsystem coupled with solar energy and comprises an air compressor set and a motor 13 which are connected through a shaft; coupled CO2Turbine 4, CO2Compressor train, CO2CO of the system generator 12The shaft end of the system generator 1 is coupled with an SSS clutch 10, and the SSS clutch 10 is coupled with the shaft ends of an air compressor unit connected with the shaft and an air compressor unit of a motor 13. The invention integrates solar energy and supercritical CO by coupling2And a power generation system for storing energy by compressed air, and integrating solar energy and supercritical CO by coupling2Supercritical CO coupling solar energy in power generation system storing energy with compressed air2The Brayton cycle power generation subsystem 101 and the compressed air energy storage subsystem 102 coupled with the solar energy are connected through the SSS clutch 10 in the following way: solar energy coupled supercritical CO2CO connected with shaft in Brayton cycle power generation subsystem 1012Turbine 4, CO2Compressor train, CO2CO in the System Generator 12System generator shaft end and SSS clutchThe SSS clutch 10 is coupled to the shaft ends of the air compressor set of the solar energy coupling compressed air energy storage subsystem 102 and the air compressor set of the electric motor 13. The connection system passes through CO2Compressor train and CO2Turbine 4 coaxial design, CO2The system generator 1 is arranged in the middle, is connected with a compressed air unit in a compressed air energy storage subsystem 102 through an SSS clutch 10, drives the compressed air unit in the compressed air energy storage subsystem 102 to store energy, and can enable supercritical CO coupled with solar energy to be used in the system2The Brayton cycle power generation subsystem 101 and the compressed air energy storage subsystem 102 coupled with the solar energy operate independently, a compressor unit directly driving the compressed air subsystem 102 does work through the SSS clutch 10, the work is not required to be converted into electric energy and then is dragged by a motor, the flexibility and the operation range of the whole system are improved, and the power grid adaptability of the system can be greatly improved.
CO in the present invention2The compressor unit comprising CO2Main compressor 2 and CO2And a recompressor 3, wherein the air compressor comprises a first-stage air compressor 11 and a second-stage air compressor 12.
Supercritical CO coupling solar energy in particular in the present invention2The Brayton cycle power generation subsystem 101 includes CO2System generator 1, CO2Main compressor 2, CO2Recompressor 3, CO2The system comprises a turbine 4, a heat regenerator 6, a high-temperature heat exchanger 7, a low-temperature heat exchanger 8 and a cooler 9. CO22CO discharged from turbine 42The medium outlet is divided into two paths after sequentially passing through the hot side of the high-temperature heat regenerator 7 and the hot side of the low-temperature heat regenerator 8, wherein one path flows into CO after being cooled by the cooler 92A main compressor 2; the other path is not cooled and directly flows into CO2And a compressor 3. CO22CO at the outlet of the main compressor 22Absorbs the heat of the low-temperature heat regenerator 8 and then reacts with CO2CO of the recompressor 32The mixed gas enters a high-temperature heat exchanger 7 after being converged, and the heat regenerator 6 absorbs heat again and then enters CO2The turbine expands to do work, thereby generating electricity.
The compressed air energy storage subsystem 102 coupled with the solar energy comprises a first-stage air compressor 11, a second-stage air compressor 12, a motor 13, a No. 1 intercooler 14, a No. 2 intercooler 15, an air storage device 16, a cold storage device 17, a heat storage device 18, a first-stage air turbine 19, a second-stage air turbine 20, a No. 1 heat exchanger 21, a No. 2 heat exchanger 22, a compressed air generator 23, a No. 1 medium pump 24 and a No. 2 medium pump 25. The inlet of the first-stage air compressor 11 is connected with air, the air is compressed by the air compressor 11 and then enters the air side inlet of the intercooler 14 No. 1 for cooling, the air enters the second-stage air compressor 12 from the air side outlet of the intercooler 14 No. 1 for compression, the air compressed again enters the air side inlet of the intercooler 15 No. 2 from the outlet of the second-stage air compressor 12, and the air side outlet of the intercooler 15 No. 2 enters the air storage device 16 through the valve III f3 for storing energy. Air media cooled and compressed in the air storage device 16 enter an air side inlet of a No. 1 heat exchanger 21 through an outlet of the air storage device 16 through a control valve four f4, the air media enter an inlet of a first-stage air turbine 19 from an air side outlet of the No. 1 heat exchanger 21 after heat exchange, enter an air side inlet of a No. 2 heat exchanger 22 from an outlet of the first-stage air turbine 19 after power generation and power application, enter an inlet of a second-stage air turbine 20 from an air side outlet of the No. 2 heat exchanger 22 after heat exchange, generate power through the second-stage air turbine 20 and apply power, an outlet of the second-stage air turbine 20 is connected with a control valve five f5 inlet, and gas is discharged through a control valve five f 5.
Meanwhile, the compressed air energy storage subsystem 102 coupled with solar energy is also provided with a cold storage device 17 and a heat storage device 18, a cooling medium of the cold storage device 17 passes through a No. 2 intercooler 15 and a No. 1 intercooler 14 respectively through a No. 1 medium pump 24, and enters the heat storage device 18 after heat exchange of the cooling medium through the No. 2 intercooler 15 and the No. 1 intercooler 14; the heat medium of the heat storage device 18 passes through the heat exchanger 21 No. 1 and the heat exchanger 22 No. 2 respectively, and enters the cold storage device 17 through the medium pump 25 No. 2 after heat exchange of the heat medium passes through the heat exchanger 21 No. 1 and the heat exchanger 22 No. 2.
When the compressed air energy storage subsystem 102 coupled with solar energy stores energy, electric energy is input into the motor 13, under the driving of the motor 13, the first-stage air compressor 11 sucks in air, heats and boosts the air, then transfers heat to the cooling medium pumped from the cold storage device 17 through the No. 1 intercooler 14, sends the heated cooling medium into the heat storage device 18, then enters the second-stage air compressor 12, boosts and heats the air, transfers the heat to the cooling medium through the No. 2 intercooler 15, and finally inputs the heated cooling medium into the air storage device 16 through the control valve three f3 for storing energy, wherein the inlet pressure of the control valve three f3 is greater than the pressure of the air storage device.
When the compressed air energy storage subsystem 102 coupled with the solar energy releases energy, the heat medium of the heat storage device 18 enters the heat exchanger No. 1 and the heat exchanger No. 2 respectively, transfers the heat energy to the air medium from the air storage device 16, and finally returns to the cold storage device 17 through the medium pump No. 2 in parallel. Meanwhile, a compressed air medium from the air storage device 16 enters the No. 1 heat exchanger 21 to absorb heat after being subjected to pressure regulation through the control valve four f4, then enters the first-stage air turbine 19 to expand to do work and generate power, then enters the No. 2 heat exchanger 22 to absorb heat, and then enters the second-stage air turbine 20 to expand to do work and generate power, the first-stage air turbine 19 and the second-stage air turbine 20 jointly push the air turbine generator 23 to generate power, and finally the power is discharged to the environment through the control valve five f 5.
When the power grid is in the low-ebb electricity consumption state, the compressed air energy storage subsystem 102 of the coupling solar energy drives the compressor system to compress air through low-ebb electricity or wind electricity, and stores high-pressure air in the air storage device 16, so that low-price electricity or unstable wind electricity resources are converted into high-pressure air to store energy, and the compressed air energy storage system not only improves the electricity consumption load, but also consumes part of the wind electricity resources. When the power grid is in a power consumption peak, high-pressure air of the air storage device 16 is heated by interstage heat extraction of a compressor unit and then expanded in an air turbine to do work to drive the turbine to generate power and supply the power to the power grid; the compressed air energy storage system has the characteristics of quick start and large capacity, and can realize the start and full load within several minutes, so that the peak regulation capacity is large, and the peak regulation capacity and the safety of a power grid can be greatly improved. Wherein, an intercooler is arranged behind each stage of air compressor, the hot end inlet of the intercooler is connected with the exhaust of the previous stage of air compressor, the outlet of the hot end is connected with the heat storage device, the cold end inlet of the intercooler is connected with the cold storage device 17, the outlet of the cold end is connected with the inlet of the next stage of air compressor, and the cold end outlet of the last stage of air compressor aftercooler is connected with the air storage device 16; the heat exchanger is arranged in front of each stage of turbine, a hot end inlet of the heat exchanger is connected with the heat storage device, an outlet of the hot end is connected with a next stage of turbine inlet, a cold end inlet of the heat exchanger is connected with an upper stage of turbine exhaust port, a cold end inlet of the first stage of heat exchanger is connected with the gas storage device 16, an outlet of the cold end is connected with the cold storage device, and the exhaust temperature of the last stage of turbine can be recycled according to actual conditions.
Meanwhile, the solar energy and supercritical CO coupling integration method is applied2And the power generation system for storing energy by compressed air also comprises a solar heat collection/storage device 5, wherein the supercritical CO coupled with solar energy is used for collecting and storing heat2In the brayton cycle power generation subsystem 101, the heat medium in the heat regenerator 6 exchanges heat and is input into the solar heat collection/storage device 5 through the seven f7 control valve, and is heated by the solar heat collection/storage device 5 and then input into the heat regenerator 6 through the nine f9 control valve. And in the compressed air energy storage subsystem 102 coupled with solar energy, heat medium in the heat storage device 18 exchanges heat and is input into the solar heat collection/storage device 5 through the control valve sixty-f 6, and is heated by the solar heat collection/storage device 5 and then is input into the heat storage device 18 through the control valve eighty-f 8. The heat of the solar energy in the present application can be automatically distributed to the supercritical CO as required2A regenerator 6 and a heat storage device 18. When heat needs to be supplied to the heat regenerator 6, the control valve eight f8 and the control valve six f6 are closed, the control valve seven f7 and the control valve nine f9 are opened, the heat medium absorbs heat in the solar heat collection/storage device 5, the heat-absorbed heat medium enters the heat regenerator 6 to exchange heat with the low-temperature side fluid of the heat regenerator 6, and the heat medium after heat exchange flows out of an outlet of the heat regenerator 6 and then enters the solar heat collection/storage device 5 again to form circulation; when the heat storage device needs to provide heat, the control valve nine f9 and the control valve seven f7 are closed, the control valve six f6 and the control valve eight f8 are opened, the heat medium absorbs heat in the solar heat collection/storage device 5, the heat-absorbed heat medium enters the heat storage device 18 to exchange heat with the low-temperature side fluid of the heat storage device 18, the heat-exchanged working medium flows out of the heat exchange working medium of the heat storage device 18 and then enters the solar heat collection/storage device 5 again to form circulation, and therefore simple solar heat exchange circulation is formed. The invention relates to aThe pipeline of the solar energy collecting/heat accumulating device 5 is provided with a plurality of control valves, and the different combinations of the states of the control valves can realize the grading, time-sharing and ladder utilization of solar energy.
Meanwhile, the air medium expanded and worked by the second-stage air turbine 20 in the compressed air energy storage subsystem 102 coupled with the solar energy is circulated to the supercritical CO coupled with the solar energy through a control valve II f22Waste heat is recovered in a heat regenerator 6 of the Brayton cycle power generation subsystem 101. The invention connects the heat regenerator 6 with the second stage air turbine 20 in the compressed air energy storage subsystem 102, and recycles the high temperature turbine exhaust, thereby improving the operation efficiency of the whole system and fully utilizing the energy in the whole system.
Meanwhile, the heat medium in the heat regenerator 6, the cooling medium in the cold storage device 17, and the heat medium in the heat storage device 18 are all air media, which is convenient for recycling the heat source.
All the devices are connected through pipelines, and valves and meters can be arranged on the pipelines according to the control requirements of the system. Other parts forming the system also comprise auxiliary facilities, an electrical system, a control system and the like.
When the whole system works and the load of a power grid is low and wind power cannot be on the grid, compressed air is used for storing energy; when the load of the power grid is high and the peak shaving requirement exists, the whole system generates power simultaneously to meet the peak shaving requirement of the power grid. And the solar energy resources are stored and generated according to the system requirements and the actual conditions of the solar energy resources.
Supercritical CO of the invention coupling solar energy2In the Brayton cycle power generation subsystem 101, supercritical CO is used2High density and no phase change within a certain range of operating parameters, thus supercritical CO2The power system equipment such as a working medium compressor, a gas turbine and the like has compact structure and smaller volume, thereby saving the cost and the space. Meanwhile, the waste heat of the work done by the second stage air turbine 20 in the compressed air energy storage subsystem 102 is heated and recovered by using solar energy for heating CO2Medium, thereby increasing turbine inlet temperature, increasing system output, improving system efficiency and operationLine range.
In the compressed air energy storage subsystem 102 coupled with solar energy, the compressor is dragged by the motor 13 or an external power generation system in the energy storage process to form heat storage and high-pressure air, and the heat storage and heating high-pressure air enters the air turbine to expand and do work in the energy release process. The temperature of the heat medium is increased by using the solar heat collection/storage 5 device, and then the temperature of compressed air of the air turbine is increased, so that the energy utilization rate in the energy release process is increased, and the efficiency of the energy storage system is increased.
The compressed air energy storage subsystem 102 coupled with the solar energy and the supercritical CO2 Brayton cycle power generation subsystem 101 coupled with the solar energy can independently operate, an air compressor set in the compressed air subsystem 102 is directly driven to do work through the SSS clutch 10, the compressed air compressor set does not need to be converted into electric energy to be dragged by a motor, the flexibility and the operation range of the whole system are improved, and the power grid adaptability of the system can be greatly improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (5)
1. The power generation system for coupling and integrating solar energy, supercritical carbon dioxide and compressed air energy storage is characterized by comprising supercritical CO coupling the solar energy2A Brayton cycle power generation subsystem (101) and a compressed air energy storage subsystem (102) coupling solar energy, the supercritical CO coupling solar energy2The Brayton cycle power generation subsystem (101) comprises sequentially coupled COs2Turbine (4), CO2Compressor train, CO2The system generator (1), the compressed air energy storage subsystem (102) coupled with the solar energy comprises an air compressor set and a motor (13) which are connected through a shaft; coupled CO2Turbine (4), CO2Compressor train, CO2CO of the system generator (1)2The shaft end of the system generator (1) is in shaft connection with an SSS clutch (10), and the SSS clutch (10) is in shaft connection with the shaft ends of an air compressor unit connected with the shaft and an air compressor unit of a motor (13);
the CO is2The compressor comprises CO2Main compressor (2) and CO2A recompressor (3); the air compressor comprises a first-stage air compressor (11) and a second-stage air compressor (12);
the compressed air energy storage subsystem (102) coupled with the solar energy comprises an energy storage component: the air conditioner comprises a first-stage air compressor (11), a second-stage air compressor (12), a motor (13), a No. 1 intercooler (14) and a No. 2 intercooler (15) which are sequentially coupled in a shaft manner; the air medium sequentially passes through a first-stage air compressor (11), a No. 1 intercooler (14) and a second-stage air compressor (12), and a No. 2 intercooler (15) is compressed and cooled and enters an air storage device (16) through a third control valve (f 3);
the compressed air energy storage subsystem coupled with the solar energy further comprises an energy release assembly: a first-stage air turbine (19), a second-stage air turbine (20) and a compressed air generator (23), as well as a No. 1 heat exchanger (21) and a No. 2 heat exchanger (22) which are sequentially coupled; the high-pressure air medium released by the air storage device (16) sequentially passes through the No. 1 heat exchanger (21), the first-stage air turbine (19) for expansion work, the No. 2 heat exchanger (22) and the second-stage air turbine (20) for expansion work through the control valve IV (f4), and is finally discharged through the control valve V (f 5);
the compressed air energy storage subsystem (102) coupled with the solar energy further comprises a cold storage device (17) and a heat storage device (18), a cooling medium of the cold storage device (17) passes through a No. 2 intercooler (15) and a No. 1 intercooler (14) through a No. 1 medium pump (24), and enters the heat storage device (18) after heat exchange of the cooling medium through the No. 2 intercooler (15) and the No. 1 intercooler (14); the heat medium of the heat storage device (18) passes through the No. 1 heat exchanger (21) and the No. 2 heat exchanger (22) respectively, and enters the cold storage device (17) through the No. 2 medium pump (25) after heat exchange of the No. 1 heat exchanger (21) and the No. 2 heat exchanger (22);
and an air medium which is expanded and does work by the second-stage air turbine (20) in the compressed air energy storage subsystem (102) coupled with the solar energy is circulated to a heat regenerator (6) of the supercritical CO2 Brayton cycle power generation subsystem (101) coupled with the solar energy through a second control valve (f2) to recover waste heat.
2. The system of claim 1, wherein the supercritical CO coupled with solar energy is used for generating power by integrating solar energy, supercritical carbon dioxide and compressed air energy storage2The Brayton cycle power generation subsystem (101) comprises sequentially coupled COs2Turbine (4), CO2Recompressor (3), CO2Main compressor (2), CO2A system generator (1); the CO is2CO discharged from the turbine (4)2The medium exchanges heat through a high-temperature heat regenerator (7) and a low-temperature heat regenerator (8) in sequence, the heat exchanged is divided into two branches, one branch flows into CO after being cooled by a cooler (9)2The other path of the main compressor (2) directly flows into CO through a first control valve (f1)2A recompressor (3); CO22CO at the outlet of the main compressor (2)2The medium passes through a low-temperature heat regenerator (8) and then is mixed with CO2CO of the recompressor (3)2The medium is converged and enters a high temperature heat exchanger (7), and then enters CO after being heated by the heat medium of a heat regenerator (6)2The turbine (4) expands to do work.
3. The system of claim 1, wherein the system is characterized by integration of solar energy, supercritical CO and compressed air energy storage2And the compressed air energy storage power generation system also comprises a solar heat collection/storage device (5), wherein a heat medium in the heat regenerator (6) exchanges heat and then is input into the solar heat collection/storage device 5 through a control valve seven (f7), and is heated by the solar heat collection/storage device 5 and then is input into the heat regenerator (6) through a control valve nine (f 9).
4. The power generation system for coupling and integrating solar energy, supercritical carbon dioxide and compressed air energy storage as claimed in claim 3, wherein the heat medium in the heat storage device (18) is input into the solar heat collection/storage device 5 through a control valve six (f6) after heat exchange, and is input into the heat storage device (18) through a control valve eight (f8) after being heated by the solar heat collection/storage device 5.
5. A power generation system coupling integrated solar energy, supercritical carbon dioxide and compressed air energy storage according to claim 1, characterized in that the heat medium in the heat regenerator (6), the cooling medium in the cold storage device (17) and the heat medium in the heat storage device (18) are all air media.
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| CN111810260B (en) * | 2020-06-30 | 2021-10-22 | 上海发电设备成套设计研究院有限责任公司 | Supercritical carbon dioxide split-flow recompression cycle power generation system |
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