CN115468317A - Carnot battery energy storage device based on solar photovoltaic photo-thermal gradient utilization - Google Patents
Carnot battery energy storage device based on solar photovoltaic photo-thermal gradient utilization Download PDFInfo
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- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical group FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical group CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 4
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
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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
- F03G6/003—Devices for producing mechanical power from solar energy having a Rankine cycle
- F03G6/004—Devices for producing mechanical power from solar energy having a Rankine cycle of the Organic Rankine Cycle [ORC] type or the Kalina Cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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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- 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
- F03G6/092—Devices for producing mechanical power from solar energy using heat pumps, e.g. solar assisted heat pumps
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
- F25B27/005—Machines, plants or systems, using particular sources of energy using solar energy in compression type systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
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Abstract
A Carnot battery energy storage device based on solar photovoltaic photo-thermal gradient utilization belongs to the technical field of energy storage. The solar photovoltaic photo-thermal energy storage system comprises a heat pump circulation loop of a Carnot battery heat pump mechanism, a heat engine circulation loop of a heat engine mechanism, a heat storage circulation loop of a heat storage mechanism and a water circulation loop of a solar photovoltaic photo-thermal step mechanism; the solar photovoltaic photo-thermal step mechanism converts solar energy into electric energy and heat energy at the same time, and the electric energy is input into the gas compressor and is finally stored in the heat storage mechanism in the form of heat energy; the heat energy is taken as a low-temperature heat source of the Carnot battery heat pump circulating mechanism, is brought into the Carnot battery heat pump mechanism through heat exchange of a heat pump working medium and a water working medium, and is finally stored in the heat storage mechanism. The invention realizes the full utilization of solar energy resources; the Carnot battery energy storage technology has the advantages of high efficiency, low cost, environmental friendliness, simple principle and the like, is particularly suitable for energy storage application on the power production side, and has great advantages in the aspects of promoting renewable energy sources to be connected to the home and the like.
Description
Technical Field
The invention belongs to the technical field of energy storage, and particularly relates to a solar photovoltaic photo-thermal (PV/T) cascade utilization technology and a Carnot cell energy storage technology.
Technical Field
With the continuous development and progress of human society and the explosive growth of human population, the demand of human beings for energy is increasing day by day. The carbon emission amount generated by heat and electricity production activities using fossil energy as a main raw material in the global range reaches 41.7% of the global total carbon emission amount. With the proposition of "carbon peak reaching" and "carbon neutralization" strategic targets (hereinafter referred to as "dual-carbon targets"), renewable energy sources such as solar energy and the like are more prominent. However, renewable resources such as solar energy are greatly influenced by factors such as day and night, seasons, regions and weather, and further development of solar photovoltaic power generation is limited by fluctuation and uncertainty of the solar photovoltaic power generation.
The advanced energy storage technology is an important means for solving the photoelectric space-time uncertainty. A carnot cell is an electric power storage system based on a heat pump (inverse) -heat engine (positive) cycle process, which stores electric energy through an "electric-heat-electric" energy conversion process, and is also called heat pump electricity storage. The Carnot battery has the advantages of no geographic condition limitation, high energy storage density, low cost and the like, and is easy to realize multi-energy combined supply of cold, heat and electricity. However, according to the second law of thermodynamics, the carnot cell heat pump-heat engine cycle process has inherent heat transfer temperature difference loss, so that the carnot cell energy storage efficiency is generally lower than that of other energy storage technologies such as pumped storage. Compared with the Carnot cell with large temperature difference, the Carnot cell with medium and low temperature difference is easier to realize due to low efficiency and difficult process caused by high temperature heat storage and high pressure ratio. However, the temperature difference between the high-temperature heat source and the low-temperature heat source of the medium-low temperature Carnot battery is smaller, the ratio of heat transfer temperature difference loss is higher, and the energy storage efficiency of the medium-low temperature Carnot battery is lower than 50%. Therefore, the efficiency improvement of the carnot cell is a key problem of the current carnot cell related research.
The improvement of the cycle low-temperature heat source temperature of the Carnot battery heat pump is an effective way for reducing heat transfer temperature difference loss and Carnot battery efficiency. The Photovoltaic/Thermal (PV/T) technology is a solar energy utilization technology which combines a solar Photovoltaic module and a heat collection module to realize the cascade utilization of the full spectrum of solar radiation. A solar photovoltaic photo-thermal cascade utilization (PV/T) system obtains electric energy through a photovoltaic cell layer on one hand, and obtains low-grade heat of 40-70 ℃ through a heat collection layer on the other hand. The part of low-grade heat can be used as a low-temperature heat source of the Carnot battery heat pump cycle.
In summary, the solar photovoltaic photo-thermal cascade utilization (PV/T) technology and the Carnot cell technology have great significance for promoting the realization of the double-carbon target, and the PV/T technology and the Carnot cell technology complement each other and have great potential in the field of solar energy storage utilization. On one hand, the Carnot cell can be used as an electric energy storage system of a solar photovoltaic photo-thermal cascade utilization (PV/T) technology, and the time uncertainty of solar energy utilization is reduced. On the other hand, the low-temperature heat obtained by using the solar photovoltaic photo-thermal cascade utilization technology is used as a low-temperature heat source of the Carnot cell heat pump cycle, so that the temperature difference to pressure ratio of the heat pump cycle can be reduced, the energy storage efficiency and the economical efficiency of the Carnot cell are improved, and meanwhile, the comprehensive utilization efficiency of solar energy is improved.
Disclosure of Invention
The invention aims to provide a Carnot battery energy storage device based on solar photovoltaic photo-thermal gradient utilization.
A carnot cell energy storage device based on solar photovoltaic photo-thermal gradient utilization comprises a carnot cell heat pump mechanism, a heat engine mechanism, a heat storage mechanism and a solar photovoltaic photo-thermal gradient utilization mechanism;
the Carnot battery heat pump mechanism comprises a heat pump circulation loop formed by sequentially connecting a gas compressor 1, one side of a heat pump working medium of a first heat exchanger 2, a pressure reducing device 3 and one side of a heat pump working medium of a second heat exchanger 4 in series; the heat pump cycle is a reverse organic Rankine cycle;
the heat pump working medium of the heat pump circulation loop is an organic working medium;
the heat engine mechanism comprises a heat engine circulating loop formed by sequentially connecting a supercharging device 5, a heat engine working medium side of a third heat exchanger 6, a steam turbine 7, a condenser 8 and a generator 9 in series; the heat engine circularly converts a part of heat energy from the heat storage mechanism into electric energy to be output, and the other part of heat energy is dissipated into air through the condenser 8; the heat engine cycle is an organic Rankine cycle;
the heat engine working medium of the heat engine circulation loop is an organic working medium;
the heat storage mechanism comprises a heat storage unit 10, a heat storage working medium side of the second heat exchanger 4 and a heat storage working medium side of the third heat exchanger 6; the heat storage unit 10 is a heat storage tank; one side of the heat storage working medium of the second heat exchanger 4 is connected in series on the heat storage tank at one side adjacent to the Carnot battery heat pump mechanism in a loop shape; one side of the heat storage working medium of the third heat exchanger 6 is connected in a loop shape in series on the heat storage tank at one side adjacent to the heat engine mechanism; the heat storage working medium is one of water, heat conduction oil or molten salt;
the solar photovoltaic photo-thermal step utilization mechanism comprises a solar photovoltaic photo-thermal plate and a water circulation loop formed by connecting one side of the water medium of the first heat exchanger 2 in series;
the solar photovoltaic photo-thermal cascade utilization mechanism converts solar energy into electric energy and heat energy at the same time, and the electric energy is input into the gas compressor 1 and is finally stored in the heat storage mechanism in the form of heat energy; the heat energy is taken as a low-temperature heat source of the Carnot battery heat pump circulating mechanism, is brought into the Carnot battery heat pump mechanism through heat exchange of a heat pump working medium and a water working medium, and is finally stored in the heat storage mechanism.
The further technical scheme is as follows:
the compressor 1 is a medium-low temperature centrifugal compressor.
The first heat exchanger 2, the second heat exchanger 4 and the third heat exchanger 6 are plate heat exchangers.
The pressure reducing device 3 is a medium-low temperature pressure reducing device.
The supercharging device 5 is a medium-low temperature supercharging pump.
The steam turbine 7 is a medium-low temperature steam turbine for power generation.
The condenser 8 is a steam condenser.
The generator 9 is a turbine generator.
The solar photovoltaic and photo-thermal plate is a solar photovoltaic and photo-thermal comprehensive utilization flat plate with a heat collecting layer and a copper pipe.
The beneficial technical effects of the invention are embodied in the following aspects:
1. based on the principle of 'spectrum opposite and cascade utilization' of solar radiation, the invention combines the heat pump circulation of the Carnot cell with the cascade utilization of solar photovoltaic photo-thermal (PV/T), and collects and stores photoelectric waste heat to replace the environment as a low-temperature heat source of the heat pump circulation of the Carnot cell. According to thermodynamic principles, the theoretical efficiency limit of a heat pump cycle can be expressed as:
η heat pump = T h /(T h -T c ) （1）
In the formula (1), T h The temperature of the high-temperature heat source of the heat pump cycle, namely the temperature of the heat storage unit 10; t is c Is the temperature of the low-temperature heat source of the heat pump cycle, i.e. the temperature of the solar photovoltaic photo-thermal panel 11. As can be seen from the formula (1), increasing the temperature of the low-temperature heat source can improve the efficiency of the heat pump cycle. For example, at a set heat storage temperature (e.g., 150 ℃), raising the low temperature heat source temperature from 20 ℃ to 50 ℃, the theoretical efficiency of the heat pump cycle will increase by about 30% (see fig. 3). And the efficiency of a carnot cell can be expressed as:
η electricity storage = η Heat pump ×η Heat storage ×η Heat engine （2）
Therefore, by the technology provided by the invention, the temperature of the low-temperature heat source of the Carnot battery can be increased by utilizing the photoelectric waste heat, and the circulation efficiency of the heat pump is increased, so that the energy storage efficiency of the Carnot battery is increased, and the efficiency loss caused by irreversible temperature difference heat transfer at the low-temperature end of the Carnot battery heat pump circulation is made up.
2. On the other hand, by using the Carnot cell, the low-grade heat energy collected by the solar photovoltaic photo-thermal cascade utilization (PV/T) is fully utilized, and the application scene of the solar photovoltaic photo-thermal cascade utilization (PV/T) technology is widened. In addition, by using a solar photovoltaic photo-thermal cascade utilization (PV/T) technology, the surface temperature of the photovoltaic cell is reduced to some extent, the photoelectric efficiency of the cell is improved to some extent, meanwhile, the comprehensive utilization efficiency of solar energy is greatly improved, and the renewable resources of solar energy are fully utilized. Therefore, the technology of the invention can realize the full utilization of solar energy resources.
3. The Carnot battery energy storage technology has the advantages of high efficiency, low cost, environmental friendliness, simple principle and the like, is particularly suitable for energy storage application on the power production side, and has great advantages in the aspects of promoting renewable energy sources to be connected to the home and the like.
Drawings
Fig. 1 is a schematic diagram of a carnot cell energy storage device based on solar photovoltaic photo-thermal step utilization.
Fig. 2 is a structural view of the solar photovoltaic photo-thermal cascade utilization apparatus.
FIG. 3 is a graph of theoretical efficiency of heat pump cycling with temperature of a low temperature heat source at a high temperature of 150 ℃.
Number in FIGS. 1-2: the solar heat collector comprises a gas compressor 1, a first heat exchanger 2, a pressure reducing device 3, a second heat exchanger 4, a pressure boosting device 5, a third heat exchanger 6, a steam turbine 7, a condenser 8, a generator 9, a heat storage unit 10, a solar photovoltaic hot plate 11, a copper pipe 12, a photovoltaic cell 13 and a heat collecting layer 14.
Detailed Description
The technical scheme of the invention is clearly and completely described by embodiments in the following with reference to the attached drawings.
Example 1
Referring to fig. 1, a carnot cell energy storage device based on solar photovoltaic photo-thermal cascade utilization comprises a carnot cell heat pump mechanism, a heat engine mechanism, a heat storage mechanism and a solar photovoltaic photo-thermal cascade utilization mechanism.
The Carnot battery heat pump mechanism comprises a heat pump circulation loop formed by sequentially connecting a gas compressor 1, one side of a heat pump working medium of a first heat exchanger 2, a pressure reducing device 3 and one side of a heat pump working medium of a second heat exchanger 4 in series; the heat pump cycle is a reverse organic Rankine cycle; the heat pump working medium of the heat pump circulation loop is an organic working medium, and specifically the organic working medium is isobutane (R600 a).
The compressor 1 is a medium-low temperature centrifugal compressor, the decompressor 3 is a medium-low temperature decompressor, and the first heat exchanger 2 and the second heat exchanger 4 are plate heat exchangers.
The heat engine mechanism comprises a heat engine circulating loop formed by sequentially connecting a supercharging device 5, a heat engine working medium side of a third heat exchanger 6, a steam turbine 7, a condenser 8 and a generator 9 in series; the heat engine circularly converts a part of heat energy from the heat storage mechanism into electric energy to be output, and the other part of heat energy is dissipated into air through the condenser 8; the heat engine cycle is an organic Rankine cycle; the heat engine working medium of the heat engine circulation loop is an organic working medium, and specifically the organic working medium is isobutane (R600 a).
The supercharging device 5 is a medium-low temperature supercharging pump, the third heat exchanger 6 is a plate heat exchanger, the steam turbine 7 is a medium-low temperature steam turbine for power generation, the condenser 8 is a steam type condenser, and the generator 9 is a steam turbine generator.
The heat storage mechanism comprises a heat storage unit 10, a heat storage working medium side of the second heat exchanger 4 and a heat storage working medium side of the third heat exchanger 6; the heat storage unit 10 is a heat storage tank; one side of the heat storage working medium of the second heat exchanger 4 is connected in a loop shape in series with the heat storage tank on one side adjacent to the Carnot battery heat pump mechanism; one side of the heat storage working medium of the third heat exchanger 6 is connected in a loop shape in series on the heat storage tank at one side adjacent to the heat engine mechanism; the heat storage working medium is water.
The solar photovoltaic photo-thermal cascade utilization mechanism comprises a water circulation loop formed by connecting a solar photovoltaic photo-thermal plate 11 and one side of a water medium of a first heat exchanger 2 in series.
Referring to fig. 2, the solar photovoltaic panel 11 includes a plurality of photovoltaic cells 13, a heat collecting layer 14, and a copper pipe group; the photovoltaic cells 13 are fixedly and uniformly distributed on the top surface of the heat collection layer 14; the copper tube set is positioned on the bottom surface of the heat collecting layer 14; the copper tube set comprises a plurality of copper tubes 12, a water inlet collecting tube and a water outlet collecting tube which are arranged in parallel, wherein the water inlet collecting tube is communicated with one ends of the copper tubes 12, and the water outlet collecting tube is communicated with the other ends of the copper tubes 12.
The specific working principle of this embodiment 1 is explained in detail as follows:
in the daytime, solar radiation irradiates the surface of the solar photovoltaic hot plate 11, and a part of the solar radiation excites electrons in the photovoltaic cell layer 13 to generate current so as to finish the conversion from solar energy to electric energy; another part of the solar radiation is absorbed by the photovoltaic cell layer 13 and the heat collecting layer 14 below the photovoltaic cell layer and is converted into heat energy, and the water medium brings the heat energy into the first heat exchanger 2 through the copper pipe group below the heat collecting layer 14 for heat exchange.
When the battery is charged, electric energy from the solar photovoltaic photo-thermal plate 11 is input into the gas compressor 1, and a heat pump working medium (low temperature and low pressure) enters the gas compressor 1 and is compressed into a high-temperature and high-pressure state; the high-temperature high-pressure working medium enters the second heat exchanger 4 through a pipeline, and the heat pump working medium releases heat to the heat storage working medium from the heat storage unit 10 in the second heat exchanger 4 to become a low-temperature high-pressure working medium; the low-temperature high-pressure working medium enters the pressure reducing device 3 through a pipeline and is reduced in pressure to be low-temperature low-pressure working medium. The low-temperature low-pressure working medium enters the first heat exchanger 2 through a pipeline, the heat pump working medium absorbs heat released by the heat collection working medium from the solar photovoltaic solar panel 11 in the first heat exchanger 2, and then returns to the air compressor 1 through the pipeline, so that heat pump circulation is completed.
When the battery discharges, the heat engine working medium (low temperature and high pressure) absorbs the heat released by the heat storage working medium from the heat storage unit 10 in the third heat exchanger 6 and becomes a high temperature and high pressure working medium; after absorbing heat, the high-temperature and high-pressure working medium enters the steam turbine 7 through a pipeline to expand and do work, the steam turbine 7 drives the generator 9 to work and output electric energy, and the heat engine working medium is changed into a low-temperature and low-pressure state; after expansion, the low-temperature and low-pressure working medium enters the condenser 8 through a pipeline and releases heat to the condenser 8; after releasing heat, the low-temperature and low-pressure working medium enters the supercharging device 5 through a pipeline and is compressed into a low-temperature and high-pressure working medium; after pressurization, the low-temperature high-pressure working medium returns to the third heat exchanger 6 through a pipeline to complete heat engine circulation.
Assuming that the heat exchange temperature of the water working medium in the first heat exchanger 2 is 50 ℃ and the temperature of the heat storage working medium in the third heat exchanger 6 is 110 ℃, when the isentropic efficiency of the air compressor 1 is 0.8 and the heat exchange coefficient of the heat exchanger is 0.95, the theoretical heating energy efficiency ratio (COP) of the heat pump cycle can reach 2.46; for the carnot cell system without using the solar photovoltaic photo-thermal cascade utilization mechanism as a heat pump cycle low-temperature heat source, the cycle working medium carries out heat convection with air in the second heat exchanger 2, the air temperature is assumed to be 20 ℃, and under the condition that other conditions are not changed, the theoretical heating energy efficiency ratio (COP) of the heat pump cycle is only 1.44. Therefore, the theoretical heating energy efficiency ratio (COP) of the Carnot battery system using the solar photovoltaic photo-thermal cascade utilization mechanism as a heat pump circulating low-temperature heat source can be improved by 70.8%.
Example 2
The heat pump working medium of a heat pump circulation loop of the Carnot battery heat pump mechanism is an organic working medium, and the organic working medium is difluoro monochloro methane (R22).
The heat engine working medium of the heat engine circulation loop is an organic working medium, and the specific organic working medium is difluorochloromethane (R22).
The heat storage working medium of the heat storage mechanism is heat conduction oil.
Otherwise, the same procedure as in example 1 was repeated.
Assuming that the heat exchange temperature of the water working medium in the first heat exchanger 2 is 50 ℃ and the temperature of the heat storage working medium in the third heat exchanger 6 is 80 ℃, when the isentropic efficiency of the air compressor 1 is 0.8 and the heat exchange coefficient of the heat exchanger is 0.95, the theoretical heating energy efficiency ratio (COP) of the heat pump cycle can reach 6.23; for the carnot cell system which does not use the solar photovoltaic photo-thermal cascade utilization mechanism as a heat pump circulation low-temperature heat source, the circulation working medium of the carnot cell system carries out heat convection with air in the second heat exchanger 2, the air temperature is assumed to be 20 ℃, and the theoretical heating energy efficiency ratio (COP) of the heat pump circulation is only 2.78 under the condition that other conditions are not changed. Therefore, the theoretical heating energy efficiency ratio (COP) of the Carnot battery system using the solar photovoltaic photo-thermal cascade utilization mechanism as a heat pump circulating low-temperature heat source can be improved by 124%.
Claims (9)
1. The utility model provides a carnot battery energy memory based on solar photovoltaic light and heat cascade utilization which characterized in that: the solar photovoltaic photo-thermal cascade utilization system comprises a Carnot battery heat pump mechanism, a heat engine mechanism, a heat storage mechanism and a solar photovoltaic photo-thermal cascade utilization mechanism;
the Carnot battery heat pump mechanism comprises a heat pump circulation loop formed by sequentially connecting an air compressor (1), one side of a heat pump working medium of a first heat exchanger (2), a pressure reducing device (3) and one side of a heat pump working medium of a second heat exchanger (4) in series; the heat pump cycle is a reverse organic Rankine cycle;
the heat pump working medium of the heat pump circulation loop is an organic working medium;
the heat engine mechanism comprises a heat engine circulating loop formed by sequentially connecting a supercharging device (5), a heat engine working medium side of a third heat exchanger (6), a steam turbine (7), a condenser (8) and a generator (9) in series; the heat engine circularly converts a part of heat energy from the heat storage mechanism into electric energy to be output, and the other part of heat energy is dispersed into air through a condenser (8); the heat engine cycle is an organic Rankine cycle;
the heat engine working medium of the heat engine circulation loop is an organic working medium;
the heat storage mechanism comprises a heat storage unit (10), a heat storage working medium side of the second heat exchanger (4) and a heat storage working medium side of the third heat exchanger (6); the heat storage unit (10) is a heat storage tank; one side of the heat storage working medium of the second heat exchanger (4) is connected in series on the heat storage tank at one side adjacent to the Carnot battery heat pump mechanism in a loop shape; one side of the heat storage working medium of the third heat exchanger (6) is connected in series on the heat storage tank at one side adjacent to the heat engine mechanism in a loop shape; the heat storage working medium is one of water, heat conduction oil or molten salt;
the solar photovoltaic photo-thermal step utilization mechanism comprises a solar photovoltaic photo-thermal plate and a water circulation loop formed by connecting one side of a water medium of a first heat exchanger (2) in series;
the solar photovoltaic photo-thermal cascade utilization mechanism converts solar energy into electric energy and heat energy at the same time, and the electric energy is input into the gas compressor (1) and is finally stored in the heat storage mechanism in the form of heat energy; the heat energy is taken as a low-temperature heat source of the Carnot battery heat pump circulating mechanism, is brought into the Carnot battery heat pump mechanism through heat exchange of a heat pump working medium and a water working medium, and is finally stored in the heat storage mechanism.
2. The solar photovoltaic photo-thermal step utilization-based Carnot cell energy storage device of claim 1, wherein: the compressor (1) is a medium-low temperature centrifugal compressor.
3. The solar photovoltaic photo-thermal cascade utilization-based carnot cell energy storage device of claim 1, wherein: the first heat exchanger (2), the second heat exchanger (4) and the third heat exchanger (6) are plate heat exchangers.
4. The solar photovoltaic photo-thermal cascade utilization-based carnot cell energy storage device of claim 1, wherein: the pressure reducing device (3) is a medium-low temperature pressure reducing device.
5. The solar photovoltaic photo-thermal step utilization-based Carnot cell energy storage device of claim 1, wherein: the supercharging device (5) is a medium-low temperature supercharging pump.
6. The solar photovoltaic photo-thermal step utilization-based Carnot cell energy storage device of claim 1, wherein: the steam turbine (7) is a medium-low temperature steam turbine for power generation.
7. The solar photovoltaic photo-thermal step utilization-based Carnot cell energy storage device of claim 1, wherein: the condenser (8) is a steam condenser.
8. The solar photovoltaic photo-thermal step utilization-based Carnot cell energy storage device of claim 1, wherein: the generator (9) is a turbine generator.
9. The solar photovoltaic photo-thermal step utilization-based Carnot cell energy storage device of claim 1, wherein: the solar photovoltaic photo-thermal plate is a solar photovoltaic photo-thermal comprehensive utilization flat plate with a heat collecting layer and a copper pipe.
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