CN111878330B - Double-Brayton combined cycle solar power generation system with heat storage function and method - Google Patents

Double-Brayton combined cycle solar power generation system with heat storage function and method Download PDF

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Publication number
CN111878330B
CN111878330B CN202010907680.0A CN202010907680A CN111878330B CN 111878330 B CN111878330 B CN 111878330B CN 202010907680 A CN202010907680 A CN 202010907680A CN 111878330 B CN111878330 B CN 111878330B
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air
heat
carbon dioxide
valve
temperature
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CN111878330A (en
Inventor
高炜
杨玉
李红智
姚明宇
顾正萌
韩万龙
张旭伟
张一帆
张磊
吴帅帅
乔永强
张纯
白文刚
蒋世希
吴家荣
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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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
    • F03G6/02—Devices for producing mechanical power from solar energy using a single state working fluid
    • F03G6/04—Devices for producing mechanical power from solar energy using a single state working fluid gaseous
    • 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
    • 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
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/006—Auxiliaries or details not otherwise provided for
    • 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
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • 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
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
    • 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
    • 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
    • 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
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S60/00—Arrangements for storing heat collected by solar heat collectors
    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/06—Superheaters
    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/02—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using Joule-Thompson effect; using vortex effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • 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
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
    • 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]
    • 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
    • Y02E60/14—Thermal energy storage
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The double-brayton combined cycle solar power generation system with heat accumulation comprises a gas compressor, wherein an inlet of the gas compressor is communicated with outside air, an outlet of the gas compressor is communicated with a low-temperature side inlet of an air heat regenerator, a low-temperature side outlet of the air heat regenerator is communicated with an inlet of an air turbine, an outlet of the air turbine is divided into two paths, one path is communicated with an inlet of a solar heat collector, the other path is connected with an inlet of a high-temperature heat accumulator, an outlet of the solar heat collector is divided into two paths, one path is connected with an inlet of the high-temperature heat accumulator, the other path is connected with an air side inlet of an air-carbon dioxide heat exchanger, one path is connected with an air side inlet of the air-carbon dioxide heat exchanger, the other path is connected with a high Wen Ceru port of the air heat exchanger after being converged with the air side outlet of the air-carbon dioxide heat exchanger, and the high-temperature side outlet of the air heat exchanger is communicated with the outside air. The invention can effectively reduce material cost and material consumption, and has higher power generation efficiency.

Description

Double-Brayton combined cycle solar power generation system with heat storage function and method
Technical Field
The invention relates to the technical field of solar power generation, in particular to a double-Brayton combined cycle solar power generation system with heat storage and a method.
Background
Solar energy is an inexhaustible clean energy source, and solar photo-thermal power generation is becoming more important because solar photo-thermal power generation can theoretically reach as high a temperature as the sun, and as is well known, the higher the temperature is, the higher the thermal efficiency is.
The photo-thermal power generation needs to convert the light energy into heat energy and then realize the thermoelectric conversion through the thermodynamic cycle, and the supercritical brayton cycle is the most advantageous cycle form among a plurality of thermodynamic cycles at present. The novel supercritical working medium carbon dioxide, helium, nitrous oxide and the like have the inherent advantages of high energy density, high heat transfer efficiency, simple system and the like, can greatly improve the heat-power conversion efficiency, reduce the equipment volume and have very high economy. Especially, when the temperature of the hot end reaches more than 500 ℃, the advantage of the supercritical carbon dioxide Brayton cycle is more and more obvious along with the temperature, and the thermal efficiency of the supercritical carbon dioxide Brayton cycle is gradually increased from that of the traditional steam cycle or other working medium.
However, the heat collecting temperature of the tower type solar energy is not high at present, wherein the material problem accounts for a great part of reasons, the high-temperature material actually applied to the power generation of the turbine unit is within 620 ℃ and is far lower than the heat source temperature which can be achieved by the solar heat collector, in addition, the solar photo-thermal power generation generally needs to consider heat storage, and a large heat storage device is generally arranged on the ground, so that the distance between the heat collector at the tower top and the heat storage device and the power generation unit is far, the main steam pressure of the power generation unit with high efficiency is large, the pipe wall is very thick, and if the pipe is made of alloy materials capable of resisting high temperature, the pipe is conveyed for a long distance, the cost is huge and obviously unacceptable.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide the double-brayton combined cycle solar power generation system with heat storage and the method thereof, which can effectively reduce material cost and material consumption and have higher power generation efficiency.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The utility model provides a take two brayton combined cycle solar power system of heat accumulation, including compressor 1, the entry of compressor 1 communicates with external air, the export of compressor 1 communicates with the low temperature side entry of air regenerator 2, the low temperature side export of air regenerator 2 communicates with air turbine 3 entry, the export of air turbine 3 divides into two ways, one is linked together with the entry of solar collector 4, the other is connected with the entry of high temperature heat accumulator 13, the export of solar collector 4 divides into two ways, the entry of high temperature heat accumulator 13 is connected to one, the entry of air-carbon dioxide heat exchanger 5 is connected to the other, the export of high temperature heat accumulator 13 divides into two ways, the entry of air-carbon dioxide heat exchanger 5 is connected to one, the high Wen Ceru mouths of air regenerator 2 are connected after the other and the air side export of air-carbon dioxide heat exchanger 5 meet, the high temperature side export of air regenerator 2 communicates with external air.
The carbon dioxide side outlet of the air-carbon dioxide heat exchanger 5 is communicated with the inlet of the carbon dioxide turbine 6, the outlet of the carbon dioxide turbine 6 is communicated with the high Wen Ceru port of the carbon dioxide heat regenerator 7, the high temperature side outlet of the carbon dioxide heat regenerator 7 is communicated with the carbon dioxide side inlet of the precooler 8, the carbon dioxide side outlet of the precooler 8 is communicated with the inlet of the carbon dioxide compressor 9, the outlet of the carbon dioxide compressor 9 is communicated with the low temperature side inlet of the carbon dioxide heat regenerator 7, and the low temperature side outlet of the carbon dioxide heat regenerator 7 is communicated with the carbon dioxide side inlet of the air-carbon dioxide heat exchanger 5.
A valve No. 110 is arranged between the outlet of the air turbine 3 and the inlet of the high-temperature heat accumulator 13, the outlet of the solar heat collector 4 is divided into two paths, one path is connected with the inlet of a valve No. 2 11, the outlet of the valve No. 2 is connected with the air side inlet of the air-carbon dioxide heat exchanger 5, the other path is connected with the inlet of a valve No. 312, and the outlet of the valve No. 110 and the outlet of the valve No. 3 are connected with the inlet of the high-temperature heat accumulator 13 after being converged.
The outlet of the high-temperature heat accumulator 13 is divided into two paths, one path is connected with the inlet of the valve No. 4 14, the other path is connected with the inlet of the valve No. 5 15, the outlet of the valve No. 4 is converged with the outlet of the valve No. 211 and then is communicated with the air side inlet of the air-carbon dioxide heat exchanger 5, and the air side outlet of the air-carbon dioxide heat exchanger 5 is converged with the outlet of the valve No. 5 and then is communicated with the high Wen Ceru port of the air heat regenerator 2.
An operation method of a double-brayton combined cycle solar power generation system with heat storage comprises the following steps of;
When sunlight is sufficient and heat in the high-temperature heat accumulator 13 is insufficient, the valve No. 110 and the valve No. 4 are closed, the valve No. 211, the valve No. 3 and the valve No. 5 are opened, firstly, the air compressor 1 absorbs air from the outside atmosphere to compress the air, then the air is sent to the cold side of the air heat regenerator 2 to absorb heat, the heated compressed air enters the air turbine 3 to expand and do work, the expanded low-pressure air enters the solar heat collector 4 to absorb heat, the air heated to high temperature is divided into two paths, one part of the air directly enters the air-carbon dioxide heat exchanger 5 to release heat through the valve No. 2, the other part of the air enters the high-temperature heat accumulator 13 to release heat through the valve No. 3, the air released in the high-temperature heat accumulator 13 is converged with the air released by the valve No. 5 and then enters the hot side of the air heat regenerator 2 to continuously release heat, and finally the air is discharged to the outside atmosphere, and at the moment, the supercritical carbon dioxide circulates to perform normal operation;
When sunlight is insufficient, but a certain amount of heat can still be provided, and enough heat can be provided in the high-temperature heat accumulator 13, the valve No. 110, the valve No. 211 and the valve No. 5 are closed, the valve No. 3, the valve No. 4 and the valve No. 12 are opened, firstly, the air compressor 1 absorbs air from the outside atmosphere to compress, then the air is sent to the cold side of the air heat regenerator 2 to absorb the heat, the heated compressed air enters the air turbine 3 to expand and do work, the expanded low-pressure air enters the solar heat collector 4 to absorb the heat, the air absorbing the certain amount of heat enters the high-temperature heat accumulator 13 through the valve No. 3 to continuously absorb the heat, then the heat is released in the air-carbon dioxide heat exchanger 5 through the valve No. 4, then the heat is continuously released on the hot side of the air heat regenerator 2, finally the air is discharged to the outside atmosphere, and the supercritical carbon dioxide cycle normally operates;
when sunlight can not provide heat and enough heat can be provided in the high-temperature heat accumulator 13, the valve No. 211, the valve No. 312 and the valve No.5 are closed, the valve No. 1, the valve No. 10 and the valve No. 4 are opened, firstly, the air compressor 1 absorbs air from the outside atmosphere to compress, then the air is sent to the cold side of the air heat regenerator 2 to absorb heat, the heated compressed air enters the air turbine 3 to expand and do work, the expanded low-pressure air directly enters the high-temperature heat accumulator 13 through the valve No. 1 to absorb heat, then the heat is released in the air-carbon dioxide heat exchanger 5 through the valve No. 4, then the heat is continuously released on the hot side of the air heat regenerator 2, finally the air is discharged to the outside atmosphere, and the supercritical carbon dioxide cycle normally operates;
When sunlight is insufficient, heat in the high-temperature heat accumulator 13 is insufficient to provide high-temperature heat of supercritical carbon dioxide circulation, but when the temperature of air brayton cycle can be met, the valve 11, the valve 12 and the valve 14 are closed, the valve 10 and the valve 15 are opened, firstly, the air compressor 1 absorbs air from the outside atmosphere to compress, then the compressed air is sent to the cold side of the air regenerator 2 to absorb heat, the heated compressed air enters the air turbine 3 to expand and do work, the expanded low-pressure air directly enters the high-temperature heat accumulator 13 through the valve 10 to absorb heat, then directly enters the hot side of the air regenerator 2 to release heat through the valve 15, and finally is discharged into the outside atmosphere, and at the moment, the supercritical carbon dioxide circulation stops running.
The supercritical carbon dioxide is circulated in a closed cycle, the high-pressure supercritical carbon dioxide after absorbing the heat released by the high-temperature air in the air-carbon dioxide heat exchanger 5 enters the carbon dioxide turbine 6 to do work, the low-pressure supercritical carbon dioxide is changed into low-pressure supercritical carbon dioxide after expansion work, the low-pressure supercritical carbon dioxide firstly enters the hot side of the carbon dioxide heat regenerator 7 to release waste heat, then enters the precooler 8 to be continuously cooled, the cooled low-pressure low-temperature supercritical carbon dioxide enters the carbon dioxide compressor 9 to be pressurized, the pressurized supercritical carbon dioxide enters the cold side of the carbon dioxide heat regenerator 7 to absorb heat, then enters the air-carbon dioxide heat exchanger 5 to continuously absorb heat, finally reaches the highest temperature, and finally enters the carbon dioxide turbine 6 to complete the final circulation.
The invention has the beneficial effects that:
According to the double-brayton combined cycle solar power generation system with heat storage, firstly, exhaust gas of an air brayton cycle turbine is used as a heat absorption working medium of a solar heat collector, and the pressure is close to normal pressure, so that the heat collector and a channel material for conveying fluid can be made of common materials, and the problem of strength at high temperature is not needed to be considered. When the high-temperature hot fluid is conveyed to the energy storage system and the vicinity of the unit, the high-temperature alloy material is selected, so that the material cost can be greatly reduced.
In addition, the invention adopts the supercritical carbon dioxide generator set, which has the characteristic of small volume and can reduce the material consumption. In addition, the system combines the air Brayton cycle with the supercritical carbon dioxide generator set, so that the power generation efficiency is higher.
Meanwhile, the system is provided with the high-temperature heat storage equipment and the related pipeline valve, so that the system has the functions of energy storage and regulation, and the impact of solar radiation on a power grid caused by time change can be greatly reduced. And the heat storage system can realize both supercritical carbon dioxide circulation heat storage and air Brayton circulation heat storage, and can realize continuous operation of high-temperature heat in the air Brayton circulation after the operation of the high-temperature supercritical carbon dioxide Brayton circulation is stopped, so that the solar heat is utilized to the maximum extent.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The device comprises a compressor 1, an air heat regenerator 2, an air turbine 3, a solar heat collector 4, an air-carbon dioxide heat exchanger 5, a carbon dioxide turbine 6, a carbon dioxide heat regenerator 7, a precooler 8, a carbon dioxide compressor 9, a valve No. 110, a valve No. 211, a valve No. 3 12, a high-temperature heat accumulator 13, a valve No. 4 14 and a valve No. 5 15.
Detailed Description
The present invention will be described in further detail with reference to examples.
Referring to fig. 1, the dual brayton combined cycle solar power generation system with heat storage according to the present invention is characterized by comprising a compressor 1, an air regenerator 2, an air turbine 3, a solar heat collector 4, an air-carbon dioxide heat exchanger 5, a carbon dioxide turbine 6, a carbon dioxide regenerator 7, a precooler 8, a carbon dioxide compressor 9, a valve No. 110, a valve No. 211, a valve No. 3 12, a high temperature heat accumulator 13, and a valve No. 414, wherein an inlet of the compressor 1 is communicated with the outside air, an outlet of the compressor 1 is communicated with a low temperature side inlet of the air regenerator 2, a low temperature side outlet of the air regenerator 2 is communicated with an air turbine inlet, an outlet of the air turbine 3 is divided into two paths, one path is communicated with an inlet of the solar heat collector 4, the other path is connected with an inlet of the valve No. 110, the outlet of the solar heat collector 4 is divided into two paths, one path is connected with the inlet of the No. 2 valve 11, the other path is connected with the inlet of the No. 3 valve 12, the No. 1 valve 10 is connected with the inlet of the high-temperature heat accumulator 13 after converging with the outlet of the No. 3 valve 12, the outlet of the high-temperature heat accumulator 13 is divided into two paths, one path is connected with the inlet of the No. 4 valve 14, the other path is connected with the inlet of the No. 5 valve, the outlet of the No. 4 valve 14 is communicated with the air side inlet of the air-carbon dioxide heat exchanger 5 after converging with the outlet of the No. 2 valve 11, the air side outlet of the air-carbon dioxide heat exchanger 5 is communicated with the high Wen Ceru port of the air heat regenerator 2 after converging with the outlet of the No. 5 valve 15, the high-temperature side outlet of the air heat regenerator 2 is communicated with the outside air, the outlet of the carbon dioxide turbine 6 is communicated with the high Wen Ceru port of the carbon dioxide heat regenerator 7, the high temperature side outlet of the carbon dioxide heat regenerator 7 is communicated with the carbon dioxide side inlet of the precooler 8, the carbon dioxide side outlet of the precooler 8 is communicated with the inlet of the carbon dioxide compressor 9, the outlet of the carbon dioxide compressor 9 is communicated with the low temperature side inlet of the carbon dioxide heat regenerator 7, the low temperature side outlet of the carbon dioxide heat regenerator 7 is communicated with the carbon dioxide side inlet of the air-carbon dioxide heat exchanger 5, and the carbon dioxide side outlet of the air-carbon dioxide heat exchanger 5 is communicated with the inlet of the carbon dioxide turbine 6.
The specific working process of the invention is as follows:
When sunlight is sufficient and heat in the high-temperature heat accumulator 13 is insufficient, the valve No. 110 and the valve No. 4 are closed, the valve No. 2 11, the valve No.3 and the valve No. 5 are opened, firstly, the air compressor 1 absorbs air from the outside atmosphere to compress the air, then the air is sent to the cold side of the air heat regenerator 2 to absorb heat, the heated compressed air enters the air turbine 3 to expand and do work, the expanded low-pressure air enters the solar heat collector 4 to absorb heat, the air heated to high temperature is divided into two paths, one part of the air directly enters the air-carbon dioxide heat exchanger 5 to release heat through the valve No. 2, the other part of the air enters the high-temperature heat accumulator 13 to release heat through the valve No.3, the air released in the high-temperature heat accumulator 13 is converged with the air released by the valve No. 5 and then enters the hot side of the air heat regenerator 2 to continuously release heat, and finally the air is discharged to the outside atmosphere. At this time, the supercritical carbon dioxide circulation is normal operation, the supercritical carbon dioxide circulation is closed circulation, the high-pressure supercritical carbon dioxide after absorbing the heat released by the high-temperature air in the air-carbon dioxide heat exchanger 5 enters the carbon dioxide turbine 6 to do work, the high-pressure supercritical carbon dioxide becomes low-pressure supercritical carbon dioxide after expansion work, the low-pressure supercritical carbon dioxide firstly enters the hot side of the carbon dioxide heat regenerator 7 to release waste heat, then enters the precooler 8 to be continuously cooled, the cooled low-pressure low-temperature supercritical carbon dioxide enters the carbon dioxide compressor 9 to be pressurized, the pressurized supercritical carbon dioxide enters the cold side of the carbon dioxide heat regenerator 7 to absorb heat, then enters the air-carbon dioxide heat exchanger 5 to continuously absorb heat, finally reaches the highest temperature, and finally enters the carbon dioxide turbine 6 to complete the final circulation.
When sunlight is insufficient, but a certain amount of heat can still be provided, and enough heat can be provided in the high-temperature heat accumulator 13, the valve No. 110, the valve No. 211 and the valve No. 5 are closed, the valve No. 3, the valve No. 4 and the valve No. 12 are opened, firstly, the air compressor 1 absorbs air from the outside atmosphere to compress, then the air is sent to the cold side of the air heat regenerator 2 to absorb the heat, the heated compressed air enters the air turbine 3 to expand and do work, the expanded low-pressure air enters the solar heat collector 4 to absorb the heat, the air absorbing the certain amount of heat enters the high-temperature heat accumulator 13 through the valve No. 3 to continuously absorb the heat, then releases heat in the air-carbon dioxide heat exchanger 5 through the valve No. 4, then enters the hot side of the air heat regenerator 2 to continuously release heat, and finally is discharged to the outside atmosphere. The supercritical carbon dioxide cycle itself operates normally.
When sunlight can not provide heat and enough heat can be provided in the high-temperature heat accumulator 13, the valve No. 211, the valve No. 312 and the valve No. 5 are closed, the valve No. 1, the valve No. 10 and the valve No.4 are opened, firstly, the air compressor 1 absorbs air from the outside atmosphere to compress, then the air is sent to the cold side of the air heat regenerator 2 to absorb heat, the heated compressed air enters the air turbine 3 to expand and do work, the expanded low-pressure air directly enters the high-temperature heat accumulator 13 through the valve No. 1 to absorb heat, then the heat is released in the air-carbon dioxide heat exchanger 5 through the valve No.4, then the heat is released continuously after the air enters the hot side of the air heat regenerator 2, and finally the air is discharged to the outside atmosphere. The supercritical carbon dioxide cycle itself operates normally.
When sunlight is insufficient, heat in the high-temperature heat accumulator 13 is insufficient to provide high-temperature heat of supercritical carbon dioxide circulation, but when the temperature of air brayton cycle can be met, the valve 11, the valve 12 and the valve 14 are closed, the valve 10 and the valve 15 are opened, firstly, the air compressor 1 absorbs air from the outside atmosphere to compress, then the air is sent to the cold side of the air regenerator 2 to absorb heat, the heated compressed air enters the air turbine 3 to expand and do work, the expanded low-pressure air directly enters the high-temperature heat accumulator 13 through the valve 10 to absorb heat, then directly enters the hot side of the air regenerator 2 to release heat through the valve 15, and finally is discharged to the outside atmosphere. The supercritical carbon dioxide cycle itself is stopped at this point.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.

Claims (5)

1. The operation method of the double-brayton combined cycle solar power generation system with heat storage is characterized by comprising the following steps of;
When sunlight is sufficient and heat in the high-temperature heat accumulator (13) is insufficient, a valve No.1 (10) is closed, a valve No. 4 (14) is opened, a valve No.2 (11), a valve No. 3 (12) and a valve No. 5 (15) are opened, firstly, the air compressor (1) absorbs air from the outside atmosphere to compress the air, then the air is sent to the cold side of the air heat regenerator (2) to absorb heat, the heated compressed air enters the air turbine (3) to expand and apply work, the expanded low-pressure air enters the solar heat collector (4) to absorb heat, the air heated to high temperature is divided into two paths, one part of the air directly enters the air-carbon dioxide heat exchanger (5) to release heat through the valve No.2, the other part of the air enters the high-temperature heat accumulator (13) to release heat through the valve No. 3 (12), and the air released in the high-temperature heat accumulator (13) is converged with the air released by the valve No. 5 (5) to enter the hot side of the air heat regenerator (2) to release heat, and finally the air is discharged to the outside atmosphere to perform normal operation, and supercritical carbon dioxide circulation is performed;
When sunlight is insufficient, but a certain amount of heat can still be provided, and enough heat can be provided in the high-temperature heat accumulator 13, the valve No. 1 (10), the valve No. 2 (11) and the valve No. 5 (15) are closed, the valve No. 3 (12) and the valve No. 4 (14) are opened, firstly, the air is absorbed by the air compressor (1) from the outside atmosphere to be compressed, then the air is sent to the cold side of the air heat regenerator (2) to absorb the heat, the heated compressed air enters the air turbine (3) to expand to do work, the expanded low-pressure air enters the solar heat collector (4) to absorb the heat, the air absorbing the certain amount of heat enters the high-temperature heat accumulator (13) through the valve No. 3 (12) to continuously absorb the heat, then the heat is released in the air-carbon dioxide heat exchanger (5) through the valve No. 4 (14), then the heat side of the air heat regenerator (2) is continuously released, finally the air is discharged to the outside atmosphere, and the supercritical carbon dioxide circulation is normally operated;
When sunlight can not provide heat and enough heat can be provided in the high-temperature heat accumulator (13), a valve No. 2 (11), a valve No. 3 (12) and a valve No. 5 (15) are closed, a valve No. 1 (10) and a valve No. 4 (14) are opened, firstly, the air compressor (1) absorbs air from the outside atmosphere to compress, then the air is sent to the cold side of the air heat regenerator (2) to absorb heat, the heated compressed air enters the air turbine (3) to expand and do work, the expanded low-pressure air directly enters the high-temperature heat accumulator (13) to absorb heat through the valve No. 1 (10), then the heat is released in the air-carbon dioxide heat exchanger (5) through the valve No. 4, then the heat is continuously released on the hot side of the air heat regenerator (2), finally the air is discharged to the outside atmosphere, and the supercritical carbon dioxide cycle normally runs;
When sunlight is insufficient, heat in the high-temperature heat accumulator (13) is insufficient to provide high-temperature heat of supercritical carbon dioxide circulation, but when the temperature of air brayton cycle can be met, a valve No. 2 (11), a valve No. 3 (12) and a valve No. 4 (14) are closed, a valve No.1 (10) and a valve No. 5 (15) are opened, firstly, the air compressor (1) absorbs air from the outside atmosphere to compress, then the air is sent to the cold side of the air regenerator (2) to absorb heat, the heated compressed air enters the air turbine (3) to expand and apply work, the expanded low-pressure air directly enters the high-temperature heat accumulator (13) through the valve No.1 (10) to absorb heat, then directly enters the hot side of the air regenerator (2) to release heat through the valve No. 5 (15) to be finally discharged into the outside atmosphere, and at the moment, the supercritical carbon dioxide circulation stops running;
The method is realized by a double-brayton combined cycle solar power generation system with heat storage, and comprises a gas compressor (1), wherein an inlet of the gas compressor (1) is communicated with the outside air, an outlet of the gas compressor (1) is communicated with a low-temperature side inlet of an air heat regenerator (2), a low-temperature side outlet of the air heat regenerator (2) is communicated with an inlet of an air turbine (3), an outlet of the air turbine (3) is divided into two paths, one path is communicated with an inlet of a solar heat collector (4), the other path is connected with an inlet of a high-temperature heat accumulator (13), an outlet of the solar heat collector (4) is divided into two paths, one path is connected with an inlet of the high-temperature heat accumulator (13), the other path is connected with an air side inlet of an air-carbon dioxide heat exchanger (5), the other path is connected with a high-temperature Wen Ceru port of the air regenerator (2) after converging with an air side outlet of the air-carbon dioxide heat exchanger (5), and the other path is communicated with the outside air.
2. The method for operating a double brayton combined cycle solar power system with heat storage according to claim 1, wherein the carbon dioxide side outlet of the air-carbon dioxide heat exchanger (5) is communicated with the inlet of the carbon dioxide turbine (6), the outlet of the carbon dioxide turbine (6) is communicated with the high Wen Ceru port of the carbon dioxide regenerator (7), the high temperature side outlet of the carbon dioxide regenerator (7) is communicated with the carbon dioxide side inlet of the precooler (8), the carbon dioxide side outlet of the precooler (8) is communicated with the inlet of the carbon dioxide compressor (9), the outlet of the carbon dioxide compressor (9) is communicated with the low temperature side inlet of the carbon dioxide regenerator (7), and the low temperature side outlet of the carbon dioxide regenerator (7) is communicated with the carbon dioxide side inlet of the air-carbon dioxide heat exchanger (5).
3. The operation method of the double-brayton combined cycle solar power generation system with heat storage according to claim 1, wherein a valve No. 1 (10) is arranged between an outlet of the air turbine (3) and an inlet of the high-temperature heat accumulator (13), an outlet of the solar heat collector (4) is divided into two paths, one path is connected with an inlet of the valve No. 2 (11), an outlet of the valve No. 2 (11) is connected with an air side inlet of the air-carbon dioxide heat exchanger (5), the other path is connected with an inlet of the valve No. 3 (12), and the outlet of the valve No. 1 (10) and the outlet of the valve No. 3 (12) are converged and then connected with an inlet of the high-temperature heat accumulator (13).
4. The operation method of the double brayton combined cycle solar power generation system with heat storage according to claim 1, wherein the outlet of the high temperature heat storage device (13) is divided into two paths, one path is connected with the inlet of a valve No. 4 (14), the other path is connected with the inlet of a valve No. 5 (15), the outlet of the valve No. 4 (14) is communicated with the air side inlet of the air-carbon dioxide heat exchanger (5) after being converged with the outlet of the valve No. 2 (11), and the air side outlet of the air-carbon dioxide heat exchanger (5) is communicated with the high Wen Ceru port of the air regenerator (2) after being converged with the outlet of the valve No. 5 (15).
5. The operation method of the double-brayton combined cycle solar power generation system with heat storage according to claim 4, wherein the supercritical carbon dioxide is circulated in a closed cycle, the high-pressure supercritical carbon dioxide after absorbing the heat released by high-temperature air in the air-carbon dioxide heat exchanger (5) enters the carbon dioxide turbine (6) to do work, the high-pressure supercritical carbon dioxide becomes low-pressure supercritical carbon dioxide after expansion work, the low-pressure supercritical carbon dioxide firstly enters the hot side of the carbon dioxide regenerator (7) to release waste heat, then enters the precooler (8) to be continuously cooled, the cooled low-pressure low-temperature supercritical carbon dioxide enters the carbon dioxide compressor (9) to be pressurized, the pressurized supercritical carbon dioxide enters the cold side of the carbon dioxide regenerator (7) to absorb heat, then enters the air-carbon dioxide heat exchanger (5) to continuously absorb heat, finally reaches the highest temperature, and finally enters the carbon dioxide turbine (6) to complete the final cycle.
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