CN214660665U - Photovoltaic power generation system with electric heating energy storage function - Google Patents
Photovoltaic power generation system with electric heating energy storage function Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 98
- 238000004146 energy storage Methods 0.000 title claims abstract description 26
- 238000005485 electric heating Methods 0.000 title claims abstract description 25
- 150000003839 salts Chemical class 0.000 claims abstract description 110
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 238000005338 heat storage Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 239000000498 cooling water Substances 0.000 claims description 22
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000013589 supplement Substances 0.000 abstract description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 47
- 238000000034 method Methods 0.000 description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229960001730 nitrous oxide Drugs 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/40—Thermal components
- H02S40/44—Means to utilise heat energy, e.g. hybrid systems producing warm water and electricity at the same time
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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
- 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
- F01K3/02—Use of accumulators and specific engine types; Control thereof
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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
- F03G6/001—Devices for producing mechanical power from solar energy having photovoltaic cells
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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
- F03G6/0055—Devices for producing mechanical power from solar energy having other power cycles, e.g. Stirling or transcritical, supercritical cycles; combined with other power sources, e.g. wind, gas or nuclear
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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
- F03G6/071—Devices for producing mechanical power from solar energy with energy storage devices
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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
- Y02E10/40—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
- Y02E10/50—Photovoltaic [PV] energy
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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
- Y02E10/60—Thermal-PV hybrids
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- General Engineering & Computer Science (AREA)
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Abstract
The utility model discloses a photovoltaic power generation system with electric heat energy storage, this system includes supercritical CO2Brayton cycle power generation system and transcritical CO2The system comprises a heat pump system, a cold storage and cooling system, an electric heating and molten salt heat storage system and a photovoltaic power generation system. The system comprises a photovoltaic power generation system, an electric heating energy storage system and supercritical CO2Brayton cycle power generation systemThe combination of the photovoltaic power generation system with low cost and relatively high technical maturity and the combination of the thermal energy storage and the thermal power generation system as the regulation and supplement power supply system of the photovoltaic power generation can not only maintain relatively low investment cost of the power generation system, but also realize the stability of power output, and simultaneously, the heat pump technology is also adopted to combine the photovoltaic power generation system and the supercritical CO2The heat released by the Brayton cycle power generation system is recovered, and the comprehensive overall power generation efficiency is further improved.
Description
Technical Field
The utility model relates to a power generation system, concretely relates to photovoltaic power generation system who is equipped with electric heat energy storage.
Background
Under the large background of energy shortage and environmental crisis, increasing attention is paid to improving energy utilization rate. Solar energy is an inexhaustible clean energy, and in the current stage, the technology of solar photovoltaic is relatively mature, the application is photovoltaic, but the energy storage is difficult to solve. However, the photovoltaic power generation system is difficult to store energy, the current mature photovoltaic energy storage matching mode is still battery energy storage, but the manufacturing cost of the battery energy storage is always too high, meanwhile, accidents such as fire disasters are difficult to avoid, and for large-scale energy storage requirements of power plants at such power levels, various types of battery energy storage are difficult to popularize at present. In addition, although the theoretical efficiency of photovoltaic power generation is high, the efficiency of the solar photovoltaic panel linearly decreases with an increase in temperature, and therefore the solar photovoltaic panel must be cooled. Meanwhile, the electric heating energy storage is a better energy storage mode, and the general electric heating energy storage is a combined heat pump cycle and a low-temperature power generation cycle. The method comprises the steps of firstly, driving a heat pump by utilizing redundant electric energy, absorbing low-temperature heat from air or river water, increasing the temperature and the pressure of the heat through the heat pump, improving the quality of the heat, then storing the heat, releasing the heat to a low-temperature power generation circulating device when power is needed, and generating power after the low-temperature power generation circulating device absorbs the heat.
On the other hand, the supercritical brayton cycle is currently the most advantageous form of cycle among the many thermodynamic cycles. The novel supercritical working medium (carbon dioxide, helium, dinitrogen oxide and the like) has the inherent advantages of high energy density, high heat transfer efficiency, simple system and the like, can greatly improve the heat-work conversion efficiency, reduces the equipment volume and has very high economical efficiency. The supercritical brayton cycle can be used as an ideal power generation system in the process of converting heat energy into electric energy.
Utility model
Disclosure of Invention
In order to overcome the problems existing in the prior art, the utility model aims to realize the energy storage of solar power generation under the premise of maintaining lower investment cost, and provides a photovoltaic power generation system equipped with electric heat energy storage.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a photovoltaic power generation system with electric heat energy storage comprises supercritical CO2Brayton cycle power generation system and transcritical CO2The system comprises a heat pump system, a cold storage and cooling system, an electric heating and molten salt heat storage system and a photovoltaic power generation system;
the supercritical CO2The Brayton cycle power generation system comprises a fused salt heat exchanger 1-1 and CO21-2 parts of turbine, 1-3 parts of high-temperature heat regenerator, 1-4 parts of low-temperature heat regenerator, 1-5 parts of recompressor, 1-6 parts of precooler, 1-7 parts of main compressor and 1-1 part of molten salt heat exchanger2Side outlet with CO2Inlet of turbine 1-2 is connected to CO2The outlet of the turbine 1-2 is communicated with the hot side inlet of the high-temperature heat regenerator 1-3, the hot side outlet of the high-temperature heat regenerator 1-3 is communicated with the hot side inlet of the low-temperature heat regenerator 1-4, the hot side outlet of the low-temperature heat regenerator 1-4 is divided into two paths, one path is communicated with the inlet of the recompressor 1-5, the other path is communicated with the hot side inlet of the precooler 1-6, the hot side outlet of the precooler 1-6 is communicated with the inlet of the main compressor 1-7, the outlet of the main compressor 1-7 is communicated with the cold side inlet of the low-temperature heat regenerator 1-4, the cold side outlet of the low-temperature heat regenerator 1-4 is communicated with the side cooling inlet of the high-temperature heat regenerator 1-3 after being converged with the outlet of the recompressor 1-5, and the cold side outlet of the high-temperature heat regenerator 1-3 is communicated with CO of the molten salt heat exchanger 1-1.2The side inlets are communicated;
the trans-critical CO2The heat pump system comprises a CO2A heat pump 2-1, a high-temperature heat exchanger 2-2 of a heat pump system,2-3 parts of cooling tower, 2-4 parts of throttling device and 2-5 parts of heat pump system low-temperature heat exchanger, CO2An outlet of the heat pump 2-1 is communicated with a hot side inlet of a high temperature heat exchanger 2-2 of the heat pump system, a hot side outlet of the high temperature heat exchanger 2-2 of the heat pump system is communicated with an inlet of a cooling tower 2-3, an outlet of the cooling tower 2-3 is communicated with an inlet of a throttling device 2-4, an outlet of the throttling device 2-4 is communicated with a cold side inlet of a low temperature heat exchanger 2-5 of the heat pump system, a cold side outlet of the low temperature heat exchanger 2-5 of the heat pump system is communicated with a CO inlet2The inlet of the heat pump 2-1 is communicated;
the cold storage and cooling system comprises a cold water storage tank 3-1, a water pump 3-2 and a hot water storage tank 3-3, wherein an outlet of the cold water storage tank 3-1 is communicated with an inlet of the water pump 3-2, an outlet of the water pump 3-2 is divided into two paths, one path is communicated with a cold side inlet of a precooler 1-6, the other path is communicated with a cooling water inlet of a photovoltaic power generation system 5, a cold side outlet of the precooler 1-6 is communicated with an inlet of the hot water storage tank 3-3 after being converged with a cooling water outlet of the photovoltaic power generation system 5, an outlet of the hot water storage tank 3-3 is communicated with a hot side inlet of a low-temperature heat exchanger 2-5 of a heat pump system, and a hot side outlet of the low-temperature heat exchanger 2-5 of the heat pump system is communicated with an inlet of the cold water storage tank 3-1;
the electric heating and fused salt heat storage system comprises a fused salt pump 4-1, a medium-temperature fused salt storage tank 4-2, a fused salt electric heater 4-3, a high-temperature fused salt storage tank 4-4 and a low-temperature fused salt storage tank 4-5, wherein an outlet of the fused salt pump 4-1 is communicated with a cold side inlet of a high-temperature heat exchanger 2-2 of the heat pump system, a cold side outlet of the high-temperature heat exchanger 2-2 of the heat pump system is communicated with an inlet of the medium-temperature fused salt storage tank 4-2, an outlet of the medium-temperature fused salt storage tank 4-2 is communicated with an inlet of the fused salt electric heater 4-3, an outlet of the fused salt electric heater 4-3 is communicated with an inlet of the high-temperature fused salt storage tank 4-4, an outlet of the high-temperature fused salt storage tank 4-4 is communicated with a high-temperature side inlet of the fused salt heat exchanger 1-1, and a high-temperature side outlet of the fused salt heat exchanger 1-1 is communicated with an inlet of the low-5, the outlet of the low-temperature molten salt storage tank 4-5 is communicated with the inlet of the molten salt pump 4-1.
The operation method of the photovoltaic power generation system with the electric heating energy storage function mainly generates power by the photovoltaic power generation system in the sunny day, and simultaneously trans-critical CO2The heat pump system provides cold storage and cooling systemThe cold source provides a preheating heat source for the electric heating and molten salt heat storage system, the cold storage and cooling system provides cooling water for the photovoltaic power generation system, and the electric heating and molten salt heat storage system stores heat, at the moment, supercritical CO2The Brayton cycle power generation system does not work; CO22The heat pump 2-1 first sub-critical CO2CO compressed to supercritical pressure and pressure raised to supercritical state2Will also rise with it, high temperature and high pressure CO2Releasing heat in a high-temperature heat exchanger 2-2 of the heat pump system, then entering a cooling tower 2-3 for further cooling, then reducing the temperature and reducing the pressure in a throttling device 2-4 through an isenthalpic process, reducing the temperature to be lower than the ambient temperature, and then absorbing the heat of cooling water in a low-temperature heat exchanger 2-5 of the heat pump system; meanwhile, the water pump 3-2 transmits the cold water stored in the cold water storage tank 3-1 to a cooling water inlet of the photovoltaic power generation system 5 to cool the photovoltaic power generation system 5, and the cooling water absorbing heat enters the hot water storage tank 3-3 and then enters the low-temperature heat exchanger 2-5 of the heat pump system to be cooled; meanwhile, the molten salt pump 4-1 conveys the low-temperature molten salt to the high-temperature heat exchanger 2-2 of the heat pump system for preheating, the preheated molten salt enters the medium-temperature molten salt storage tank 4-2 and then enters the molten salt electric heater 4-3 to be heated to high temperature, and the high-temperature molten salt enters the high-temperature molten salt storage tank 4-4 to be stored. In the process, the electric energy of the molten salt electric heater 4-3 can come from a power grid or can be directly taken from the photovoltaic power generation system 5, namely, redundant electric energy generated by the photovoltaic power generation system 5 in the daytime when sunlight is sufficient is converted into heat energy to be stored;
supercritical CO in the absence of sunlight at night2The Brayton cycle power generation system starts to operate and outputs electric energy, and simultaneously, transcritical CO is adopted2The heat pump system provides a cold source for the cold storage and cooling system, provides a preheating heat source for the electric heating and molten salt heat storage system, and the cold storage and cooling system is supercritical CO2The Brayton cycle power generation system provides cooling water, the electric heating and molten salt heat storage system releases heat, and the photovoltaic power generation system 5 does not work in the period; firstly, high-temperature molten salt stored in a high-temperature molten salt storage tank 4-4 enters a molten salt heat exchanger 1-1 to release heat, then enters a low-temperature molten salt storage tank 4-5, and then is conveyed to a heat pump system by a molten salt pump 4-1 to be heatedPreheating in a heat exchanger 2-2, and then feeding the preheated molten salt into a medium-temperature molten salt storage tank 4-2 for storage; at the same time, the supercritical CO heated in the molten salt heat exchanger 1-12Into CO2The turbine 1-2 does work, low-pressure gas after doing work sequentially enters the high-temperature heat regenerator 1-3 and the low-temperature heat regenerator 1-4 to release heat, then is divided into two paths, one path is directly pressurized by the recompressor 1-5, the other path is further cooled in the precooler 1-6 and then is pressurized by the main compressor 1-7, and pressurized CO2Enters a low-temperature heat regenerator 1-4 to absorb heat and then is in contact with CO at the outlet of a recompressor 1-52After being converged, the heat is further absorbed in a high-temperature heat regenerator 1-3, and finally enters a molten salt heat exchanger 1-1 to be heated to high temperature; at the same time, transcritical CO2The heat pump system has the same working process with the daytime; meanwhile, the water pump 3-2 conveys the cold water stored in the cold water storage tank 3-1 to a cooling water inlet of the precooler 1-6 for CO2Cooling, wherein cooling water after absorbing heat enters a hot water storage tank 3-3 and then enters a low-temperature heat exchanger 2-5 of a heat pump system to be cooled;
when the photovoltaic power generation system is short of power supply and the electric heating and molten salt heat storage system has stored heat, the photovoltaic power generation system and the supercritical CO2The Brayton cycle power generation system operates simultaneously to output electric energy, and at the moment, the cold storage and cooling system is a photovoltaic power generation system and supercritical CO2The Brayton cycle power generation system simultaneously provides low-temperature cooling water, and the photovoltaic power generation system and the supercritical CO2The operation flow of the Brayton cycle power generation system is the same as that of the Brayton cycle power generation system during independent operation, and in the process, the working flow of the electric heating and molten salt heat storage system is the same as that at night.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model relates to a photovoltaic power generation system who is equipped with electric heat energy storage with photovoltaic power generation system and electric heat energy storage system, supercritical CO2The Brayton cycle power generation system is combined, a photovoltaic power generation system which is low in cost and relatively high in technical maturity is adopted, and the thermal energy storage and thermal power generation system is combined to serve as a regulation and supplement power supply system for photovoltaic power generation, so that the Brayton cycle power generation system is combined, and the Brayton cycle power generation system is used as a regulation and supplement power supply system for photovoltaic power generationCan maintain relatively low investment cost of a power generation system, can realize the stability of power output, and simultaneously adopts the heat pump technology to connect the photovoltaic power generation system and the supercritical CO2The heat released by the Brayton cycle power generation system is recovered, and the comprehensive overall power generation efficiency is further improved.
Drawings
Fig. 1 is a schematic structural diagram of the system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
as shown in FIG. 1, a photovoltaic power generation system equipped with electrothermal energy storage comprises supercritical CO2Brayton cycle power generation system and transcritical CO2The system comprises a heat pump system, a cold storage and cooling system, an electric heating and molten salt heat storage system and a photovoltaic power generation system;
the supercritical CO2The Brayton cycle power generation system comprises a fused salt heat exchanger 1-1 and CO21-2 parts of turbine, 1-3 parts of high-temperature heat regenerator, 1-4 parts of low-temperature heat regenerator, 1-5 parts of recompressor, 1-6 parts of precooler, 1-7 parts of main compressor and 1-1 part of molten salt heat exchanger2Side outlet with CO2Inlet of turbine 1-2 is connected to CO2The outlet of the turbine 1-2 is communicated with the hot side inlet of the high-temperature heat regenerator 1-3, the hot side outlet of the high-temperature heat regenerator 1-3 is communicated with the hot side inlet of the low-temperature heat regenerator 1-4, the hot side outlet of the low-temperature heat regenerator 1-4 is divided into two paths, one path is communicated with the inlet of the recompressor 1-5, the other path is communicated with the hot side inlet of the precooler 1-6, the hot side outlet of the precooler 1-6 is communicated with the inlet of the main compressor 1-7, the outlet of the main compressor 1-7 is communicated with the cold side inlet of the low-temperature heat regenerator 1-4, the cold side outlet of the low-temperature heat regenerator 1-4 is communicated with the cold side inlet of the high-temperature heat regenerator 1-3 after being converged with the outlet of the recompressor 1-5, and the cold side outlet of the high-temperature heat regenerator 1-3 is communicated with CO of the molten salt heat exchanger 1-1.2The side inlets are communicated;
the trans-critical CO2The heat pump system comprises a CO22-1 parts of heat pump, 2-2 parts of high-temperature heat exchanger of heat pump system, 2-3 parts of cooling tower, 2-4 parts of throttling device and 2-5 parts of low-temperature heat exchanger of heat pump system, and CO2Heat pump 2-1 and outlet thereofThe hot side inlet of the system high temperature heat exchanger 2-2 is communicated, the hot side outlet of the heat pump system high temperature heat exchanger 2-2 is communicated with the inlet of the cooling tower 2-3, the outlet of the cooling tower 2-3 is communicated with the inlet of the throttling device 2-4, the outlet of the throttling device 2-4 is communicated with the cold side inlet of the heat pump system low temperature heat exchanger 2-5, the cold side outlet of the heat pump system low temperature heat exchanger 2-5 is communicated with the CO2The inlet of the heat pump 2-1 is communicated;
the cold storage and cooling system comprises a cold water storage tank 3-1, a water pump 3-2 and a hot water storage tank 3-3, wherein an outlet of the cold water storage tank 3-1 is communicated with an inlet of the water pump 3-2, an outlet of the water pump 3-2 is divided into two paths, one path is communicated with a cold side inlet of a precooler 1-6, the other path is communicated with a cooling water inlet of a photovoltaic power generation system 5, a cold side outlet of the precooler 1-6 is communicated with an inlet of the hot water storage tank 3-3 after being converged with a cooling water outlet of the photovoltaic power generation system 5, an outlet of the hot water storage tank 3-3 is communicated with a hot side inlet of a low-temperature heat exchanger 2-5 of a heat pump system, and a hot side outlet of the low-temperature heat exchanger 2-5 of the heat pump system is communicated with an inlet of the cold water storage tank 3-1;
the electric heating and fused salt heat storage system comprises a fused salt pump 4-1, a medium-temperature fused salt storage tank 4-2, a fused salt electric heater 4-3, a high-temperature fused salt storage tank 4-4 and a low-temperature fused salt storage tank 4-5, wherein an outlet of the fused salt pump 4-1 is communicated with a cold side inlet of a high-temperature heat exchanger 2-2 of the heat pump system, a cold side outlet of the high-temperature heat exchanger 2-2 of the heat pump system is communicated with an inlet of the medium-temperature fused salt storage tank 4-2, an outlet of the medium-temperature fused salt storage tank 4-2 is communicated with an inlet of the fused salt electric heater 4-3, an outlet of the fused salt electric heater 4-3 is communicated with an inlet of the high-temperature fused salt storage tank 4-4, an outlet of the high-temperature fused salt storage tank 4-4 is communicated with a high-temperature side inlet of the fused salt heat exchanger 1-1, and a high-temperature side outlet of the fused salt heat exchanger 1-1 is communicated with an inlet of the low-5, the outlet of the low-temperature molten salt storage tank 4-5 is communicated with the inlet of the molten salt pump 4-1.
As a preferred embodiment of the present invention, the transcritical CO is2CO in heat pump system2The inlet pressure of the heat pump 2-1 is 3 MPa-4 MPa, the outlet pressure is 24 MPa-30 MPa, the outlet temperature of the CO2 heat pump reaches the design temperature above 300 ℃ within the pressure range, the heat efficiency of the heat pump system is higher, and the temperature of the cold end can be higherThe cooling requirement of a supercritical CO2 Brayton cycle power generation system is met.
As a preferred embodiment of the present invention, the photovoltaic power generation system 5 is composed of a plurality of photovoltaic panels connected in parallel, thereby improving the photovoltaic power generation efficiency.
The utility model discloses the concrete working process of system does:
a photovoltaic power generation system with electric heating energy storage and an operation method thereof are mainly used for generating power by the photovoltaic power generation system in the sunny day and simultaneously trans-critical CO2The heat pump system provides a cold source for the cold storage and cooling system, provides a preheating heat source for the electric heating and molten salt heat storage system, the cold storage and cooling system provides cooling water for the photovoltaic power generation system, the electric heating and molten salt heat storage system stores heat, and at the moment, the supercritical CO heat storage system stores heat2The brayton cycle power generation system does not operate. CO22The heat pump 2-1 first sub-critical CO2CO compressed to supercritical pressure and pressure raised to supercritical state2Will also rise with it, high temperature and high pressure CO2Releasing heat in a high-temperature heat exchanger 2-2 of the heat pump system, then entering a cooling tower 2-3 for further cooling, then reducing the temperature and reducing the pressure in a throttling device 2-4 through an isenthalpic process, reducing the temperature to be lower than the ambient temperature, and then absorbing the heat of cooling water in a low-temperature heat exchanger 2-5 of the heat pump system; meanwhile, the water pump 3-2 transmits the cold water stored in the cold water storage tank 3-1 to a cooling water inlet of the photovoltaic power generation system 5 to cool the photovoltaic power generation system 5, and the cooling water absorbing heat enters the hot water storage tank 3-3 and then enters the low-temperature heat exchanger 2-5 of the heat pump system to be cooled; meanwhile, the molten salt pump 4-1 conveys the low-temperature molten salt to the high-temperature heat exchanger 2-2 of the heat pump system for preheating, the preheated molten salt enters the medium-temperature molten salt storage tank 4-2 and then enters the molten salt electric heater 4-3 to be heated to high temperature, and the high-temperature molten salt enters the high-temperature molten salt storage tank 4-4 to be stored. In the process, the electric energy of the molten salt electric heater 4-3 can come from a power grid or can be directly taken from the photovoltaic power generation system 5, namely, redundant electric energy generated by the photovoltaic power generation system 5 in the daytime when sunlight is sufficient is converted into heat energy to be stored;
supercritical CO in the absence of sunlight at night2Brayton cycleThe ring power generation system starts to operate and outputs electric energy, and simultaneously, transcritical CO is adopted2The heat pump system provides a cold source for the cold storage and cooling system, provides a preheating heat source for the electric heating and molten salt heat storage system, and the cold storage and cooling system is supercritical CO2The Brayton cycle power generation system provides cooling water, and the electric heat and molten salt heat storage system releases heat, during which the photovoltaic power generation system 5 does not operate. Firstly, high-temperature molten salt stored in a high-temperature molten salt storage tank 4-4 enters a molten salt heat exchanger 1-1 to release heat, then enters a low-temperature molten salt storage tank 4-5, then is conveyed to a high-temperature heat exchanger 2-2 of a heat pump system by a molten salt pump 4-1 to be preheated, and then enters a medium-temperature molten salt storage tank 4-2 to be stored; at the same time, the supercritical CO heated in the molten salt heat exchanger 1-12Into CO2The turbine 1-2 does work, low-pressure gas after doing work sequentially enters the high-temperature heat regenerator 1-3 and the low-temperature heat regenerator 1-4 to release heat, then is divided into two paths, one path is directly pressurized by the recompressor 1-5, the other path is further cooled in the precooler 1-6 and then is pressurized by the main compressor 1-7, and pressurized CO2Enters a low-temperature heat regenerator 1-4 to absorb heat and then is in contact with CO at the outlet of a recompressor 1-52After being converged, the heat is further absorbed in a high-temperature heat regenerator 1-3, and finally enters a molten salt heat exchanger 1-1 to be heated to high temperature; at the same time, transcritical CO2The heat pump system has the same working process with the daytime; meanwhile, the water pump 3-2 conveys the cold water stored in the cold water storage tank 3-1 to a cooling water inlet of the precooler 1-6 for CO2And cooling, wherein the cooling water after absorbing heat enters a hot water storage tank 3-3 and then enters a low-temperature heat exchanger 2-5 of the heat pump system to be cooled.
When the photovoltaic power generation system is short of power supply and the electric heating and molten salt heat storage system has stored heat, the photovoltaic power generation system and the supercritical CO2The Brayton cycle power generation system operates simultaneously to output electric energy, and at the moment, the cold storage and cooling system is a photovoltaic power generation system and supercritical CO2The Brayton cycle power generation system simultaneously provides low-temperature cooling water, and the photovoltaic power generation system and the supercritical CO2The operation flow of the Brayton cycle power generation system is the same as that of the independent operation, and in the process, the electric heat and the molten salt are usedThe working process of the heat storage system is the same as that at night.
But supercritical CO as shown in FIG. 12Other overall arrangement of brayton cycle power generation system do not influence the utility model discloses an use, the utility model discloses a content is also suitable for to other overall arrangements of supercritical cycle system, consequently the utility model provides a supercritical brayton cycle system is the supercritical brayton cycle system in the broad meaning, and not confine the drawing to the overall arrangement. For example, other supercritical brayton cycle systems may employ a multi-stage turbine system, or a turbine system with reheat, or may not employ a split recompression system, i.e., only a single main compressor, no recompressor, and combining two regenerators into one regenerator, etc.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A photovoltaic power generation system equipped with electric heating energy storage is characterized by comprising supercritical CO2Brayton cycle power generation system and transcritical CO2The system comprises a heat pump system, a cold storage and cooling system, an electric heating and molten salt heat storage system and a photovoltaic power generation system;
the supercritical CO2The Brayton cycle power generation system comprises a fused salt heat exchanger (1-1) and CO2Turbine (1-2), high-temperature heat regenerator (1-3), low-temperature heat regenerator (1-4), recompressor (1-5), precooler (1-6), main compressor (1-7), CO of molten salt heat exchanger (1-1)2Side outlet with CO2Inlet of turbine (1-2) is connected to CO2The outlet of the turbine (1-2) is communicated with the hot side inlet of the high-temperature regenerator (1-3), the hot side outlet of the high-temperature regenerator (1-3) is communicated with the hot side inlet of the low-temperature regenerator (1-4), the hot side outlet of the low-temperature regenerator (1-4) is divided into two paths, one path is communicated with the recompressor (1-5)) The inlet of the pre-cooler (1-6) is communicated, the other path is communicated with the hot side inlet of the pre-cooler (1-6), the hot side outlet of the pre-cooler (1-6) is communicated with the inlet of the main compressor (1-7), the outlet of the main compressor (1-7) is communicated with the cold side inlet of the low-temperature regenerator (1-4), the cold side outlet of the low-temperature regenerator (1-4) is communicated with the cold side inlet of the high-temperature regenerator (1-3) after being converged with the outlet of the re-compressor (1-5), and the cold side outlet of the high-temperature regenerator (1-3) is communicated with the CO inlet of the molten salt heat exchanger (1-1)2The side inlets are communicated;
the trans-critical CO2The heat pump system comprises a CO2A heat pump (2-1), a high-temperature heat exchanger (2-2) of the heat pump system, a cooling tower (2-3), a throttling device (2-4), a low-temperature heat exchanger (2-5) of the heat pump system, and CO2The outlet of the heat pump (2-1) is communicated with the hot side inlet of the high temperature heat exchanger (2-2) of the heat pump system, the hot side outlet of the high temperature heat exchanger (2-2) of the heat pump system is communicated with the inlet of the cooling tower (2-3), the outlet of the cooling tower (2-3) is communicated with the inlet of the throttling device (2-4), the outlet of the throttling device (2-4) is communicated with the cold side inlet of the low temperature heat exchanger (2-5) of the heat pump system, and the cold side outlet of the low temperature heat exchanger (2-5) of the heat pump system is communicated with CO2The inlets of the heat pumps (2-1) are communicated;
the cold storage and cooling system comprises a cold water storage tank (3-1), the system comprises a water pump (3-2) and a hot water storage tank (3-3), wherein an outlet of the cold water storage tank (3-1) is communicated with an inlet of the water pump (3-2), an outlet of the water pump (3-2) is divided into two paths, one path is communicated with a cold side inlet of a precooler (1-6), the other path is communicated with a cooling water inlet of a photovoltaic power generation system (5), a cold side outlet of the precooler (1-6) is communicated with an inlet of the hot water storage tank (3-3) after being converged with a cooling water outlet of the photovoltaic power generation system (5), an outlet of the hot water storage tank (3-3) is communicated with a hot side inlet of a low-temperature heat exchanger (2-5) of a heat pump system, and a hot side outlet of the low-temperature heat exchanger (2-5) of the heat pump system is communicated with an inlet of the cold water storage tank (3-1);
the electric heating and fused salt heat storage system comprises a fused salt pump (4-1), a medium-temperature fused salt storage tank (4-2), a fused salt electric heater (4-3), a high-temperature fused salt storage tank (4-4) and a low-temperature fused salt storage tank (4-5), wherein an outlet of the fused salt pump (4-1) is communicated with a cold side inlet of the high-temperature heat exchanger (2-2) of the heat pump system, a cold side outlet of the high-temperature heat exchanger (2-2) of the heat pump system is communicated with an inlet of the medium-temperature fused salt storage tank (4-2), an outlet of the medium-temperature fused salt storage tank (4-2) is communicated with an inlet of the fused salt electric heater (4-3), an outlet of the fused salt electric heater (4-3) is communicated with an inlet of the high-temperature fused salt storage tank (4-4), an outlet of the high-temperature fused salt storage tank (4-4) is communicated with a high-side inlet of the fused salt heat exchanger (1-1), the outlet of the high-temperature side of the molten salt heat exchanger (1-1) is communicated with the inlet of the low-temperature molten salt storage tank (4-5), and the outlet of the low-temperature molten salt storage tank (4-5) is communicated with the inlet of the molten salt pump (4-1).
2. The system of claim 1, wherein the transcritical CO is present in the photovoltaic power generation system with electrical heat storage2CO in heat pump system2The inlet pressure of the heat pump (2-1) is 3 MPa-4 MPa, the outlet pressure is 24 MPa-30 MPa, and the outlet temperature of the CO2 heat pump reaches the design temperature above 300 ℃ within the pressure range.
3. A photovoltaic power generation system equipped with electrothermal energy storage according to claim 1, characterized in that the photovoltaic power generation system (5) is composed of a plurality of photovoltaic panels connected in parallel.
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| CN202121156569.9U CN214660665U (en) | 2021-05-27 | 2021-05-27 | Photovoltaic power generation system with electric heating energy storage function |
| DE202021105173.6U DE202021105173U1 (en) | 2021-05-27 | 2021-09-24 | Photovoltaic power generation system with electrothermal energy storage |
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| CN114543573B (en) * | 2022-01-10 | 2023-12-26 | 中国能源建设集团山西省电力勘测设计院有限公司 | Fused salt heat storage and release method for improving fused salt medium heat exchange power and reducing failure rate |
| CN114483230A (en) * | 2022-01-14 | 2022-05-13 | 中国科学院理化技术研究所 | Carbon dioxide energy storage peak regulation system coupled with solar heat storage and thermal power waste heat |
| CN115263477B (en) * | 2022-08-03 | 2024-05-07 | 西安热工研究院有限公司 | Air-cooled micro-stack energy conversion system and method for coupling energy storage and Brayton cycle |
| CN116214656B (en) * | 2023-01-31 | 2023-10-20 | 中国二十二冶集团有限公司 | Method for comprehensively utilizing energy of wood dryer based on phase change |
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| CN113187680A (en) * | 2021-05-27 | 2021-07-30 | 西安热工研究院有限公司 | Photovoltaic power generation system with electric heating energy storage and operation method |
| CN113187680B (en) * | 2021-05-27 | 2024-06-04 | 西安热工研究院有限公司 | Photovoltaic power generation system with electrothermal energy storage function and operation method |
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