CN112943392B - Electric storage method of energy storage system based on high-temperature heat transfer pump and organic Rankine cycle - Google Patents
Electric storage method of energy storage system based on high-temperature heat transfer pump and organic Rankine cycle Download PDFInfo
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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
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/003—Arrangements for measuring or testing
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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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
- F01K21/00—Steam engine plants not otherwise provided for
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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
- 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
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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
- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
A power storage method of an energy storage system based on a high-temperature heat transmission pump and an organic Rankine cycle comprises the steps of absorbing waste heat and waste heat through a working medium in a power storage stage, compressing the waste heat and the waste heat to a high-temperature high-pressure state through a compressor, storing heat in a latent heat storage tank and a sensible heat storage tank, and completing circulation of the high-temperature heat transmission pump system through an expansion valve; and in the discharging stage, the heat in the sensible heat storage tank and the latent heat storage tank is absorbed by the working medium and reaches a high-temperature and high-pressure state, and then the expander outputs energy to drive the generator to generate power so as to complete the cycle of the organic Rankine cycle system. The invention can enhance the flexibility of the power grid, effectively solves the intermittent problem of renewable energy power generation, has the advantages of compact structure, combined heat and power supply, high energy storage efficiency and no restriction by geographical and geological conditions, and can ensure that the reciprocating efficiency of energy storage exceeds 100 percent by utilizing waste heat and waste heat.
Description
Technical Field
The invention relates to the technology in the field of energy storage, in particular to an electricity storage method of an energy storage system based on a high-temperature heat transfer pump and an organic Rankine cycle.
Background
The heat transfer pump type electricity storage system is an electric energy storage technology developed based on power circulation and heat energy storage technologies, and can make up for the defects and shortcomings of pumped storage and compressed air energy storage technologies. However, the existing energy storage system has low heat storage density and cannot realize large-scale heat storage.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an electricity storage method of an energy storage system based on a high-temperature heat transfer pump and an organic Rankine cycle, which combines a sensible heat storage tank and a latent heat storage tank, improves the device structure of the system, adopts phase change heat storage and integrates waste heat and waste heat, has the overall electricity storage reciprocating efficiency of over 100 percent compared with water pumping heat storage, can solve the problems of large-scale access of renewable energy sources, balances the electric load, and has the advantages of high energy storage density and no restriction of geographical and geological conditions.
The invention is realized by the following technical scheme:
the invention relates to an electricity storage method of an energy storage system based on a high-temperature heat transmission pump and an organic Rankine cycle, wherein in an electricity storage stage, after waste heat and waste heat are absorbed through a working medium and compressed to a high-temperature and high-pressure state by a compressor, heat is stored in a latent heat storage tank and a sensible heat storage tank, and then circulation of the high-temperature heat transmission pump system is completed through an expansion valve; and in the discharging stage, the heat in the sensible heat storage tank and the latent heat storage tank is absorbed by the working medium and reaches a high-temperature and high-pressure state, and then the expander outputs energy to drive the generator to generate power so as to complete the cycle of the organic Rankine cycle system.
Latent heat storage jar link to each other with high temperature heat transfer pump system and organic rankine cycle system respectively, sensible heat storage jar links to each other with high temperature heat transfer pump system and organic rankine cycle system respectively, wherein: the high temperature heat transfer pump system includes: the charge flowmeter that connects gradually, be used for improving precooling equipment, expansion valve, first heat exchanger and the compressor of heat-retaining efficiency, wherein: the compressor and the charging flowmeter are respectively connected with the latent heat storage tank, and the precooling equipment is connected with the sensible heat storage tank; an organic Rankine cycle system includes: discharge flowmeter, expander, second heat exchanger, transmission pump that connect gradually and be used for improving heat exchange efficiency's preheating apparatus, wherein: the preheating device is respectively connected with the latent heat storage tank and the sensible heat storage tank, and the discharge flow meter is connected with the latent heat storage tank.
The sensible heat storage tank is internally provided with a common heat storage medium and precooling equipment, wherein: the precooling equipment cools the high-temperature working medium, and the common heat storage medium receives the heat in the working medium.
The common heat storage medium comprises: stone, high pressure water, trans-1-chloro-2-phenylthiocyclohexane, 1-chloro-3, 3, 3-trifluoroprop-1-ene (R1233ZD), fluorinated liquid (NOVEC649) or cyclopentane.
Latent heat storage jar built-in phase transition heat-retaining medium and preheating equipment, wherein: before entering the latent heat storage tank to absorb heat, the working medium absorbs heat to the common heat storage medium stored in the sensible heat storage tank through the preheating device, and the preheating process is completed.
The phase-change heat storage medium comprises: LiNO with a phase transition temperature of 133 DEG C 3 -KNO 3 Mixed salt, KNO with a phase transition temperature of 149 DEG C 2 -NaNO 3 The mixed salt or HCOONa-HCOOK with the phase transition temperature of 176 ℃ is selected, and LiNO with the phase transition temperature of 133 ℃ is adopted in the embodiment 3 -KNO 3 And (3) mixing the salt.
The heat storage temperature of the latent heat storage tank is 110-200 ℃, and the heat storage temperature of the sensible heat storage tank is 80-110 ℃.
The phase change temperature of the phase change heat storage medium of the latent heat storage tank is 100-180 ℃.
The compressor compresses the working medium to make it in subcritical state and critical temperature T cirt >145 ℃ and critical pressure P crit <3MPa, and the compression ratio is more than 4; the expansion ratio of the expansion machine to the working medium is more than 4.
The default ambient temperature of the first heat exchanger and the second heat exchanger is 25 ℃.
The heat source is industrial waste heat or waste heat of cement, electric power, chemical industry and the like, and the temperature of the heat source is 70-110 ℃.
The electricity storage method also comprises the steps of utilizing surplus electric energy to supply stored energy for driving the compressor, applying work to the expansion machine by the working medium through the generator to convert the working medium into electric energy, and supplementing the electric energy during peak electricity consumption, and comprises the following steps: a charging process and a discharging process.
The charging process specifically comprises the following steps: working medium at ambient temperature and pressure absorbs heat to a low-temperature heat source and is compressed into a high-temperature and high-pressure state, then enters a latent heat storage tank to release heat to a phase-change heat storage medium and enters precooling equipment of a high-temperature heat transfer pump system to transmit redundant heat to a common heat storage medium in a sensible heat storage tank, and after heat exchange is completed, high-pressure working medium enters an expansion valve and is expanded into a normal-temperature and normal-pressure state to complete an energy storage cycle process.
The discharge process specifically comprises the following steps: working medium at ambient temperature and pressure absorbs heat of the sensible heat storage tank and the latent heat storage tank through the action of the transmission pump, the working medium is changed into a high-temperature high-pressure state, the working medium enters the expansion machine to do work, the working medium does work through the generator and is converted into electric energy, the problems of insufficient electric energy and intermittent renewable energy power generation during power consumption peak are solved, then heat exchange is carried out with the environment, heat generated irreversibly is discharged, the working medium is changed into a normal-temperature normal-pressure state, and one-time discharge circulation is completed.
Technical effects
The invention integrally solves the defects of low energy storage efficiency, low heat storage density and geographical environment limitation when sensible heat storage is adopted in the prior art; compared with the prior art, the invention adopts a combined heat and power supply mode, not only can supply power to users, but also can supply heat to heat user heat sources, including domestic hot water and industrial high-temperature steam.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic diagram of a charging process according to the present invention;
FIG. 3 is a schematic diagram of the discharge process of the present invention;
FIG. 4 is a schematic view of the internal structure of the latent heat storage tank of the present invention;
in the figure: the system comprises a first heat exchanger 1, a compressor 2, a latent heat storage tank 3, a precooling device 4, a sensible heat storage tank 5, an expansion valve 6, an expansion machine 7, a second heat exchanger 8, a transfer pump 9, a preheating device 10, a charge flow meter 11, a discharge flow meter 12, a first charge circuit 13, a second charge circuit 14, a third charge circuit 15, a fourth charge circuit 16, a first discharge circuit 17, a second discharge circuit 18, a third discharge circuit 19, a fourth discharge circuit 20, a fifth discharge circuit 21, a first heat consumer 22, a second heat consumer 23, an energy storage structure 24, a high-temperature heat transfer pump system 25 and an organic Rankine cycle system 26.
Detailed Description
As shown in fig. 1, in an electricity storage method of an energy storage system based on a high-temperature heat transfer pump and an organic rankine cycle according to the present embodiment, in an electricity storage phase: the working medium absorbs waste heat and waste heat in the first heat exchanger 1, the external power grid drives the compressor to further compress the working medium into a high-temperature and high-pressure state, heat is stored in the latent heat storage tank 3 and the sensible heat storage tank 5, the working medium is changed into a normal-temperature and normal-pressure state after passing through the expansion valve 6, and circulation of the high-temperature heat transfer pump is completed; in the discharging stage: the working medium absorbs the heat of the sensible heat storage tank 5 and the latent heat storage tank 3 under the action of the transmission pump 9, the working medium is changed into a high-temperature and high-pressure state, the expansion machine 7 is acted, the expansion machine 7 outputs energy to drive the generator to generate electricity, heat is exchanged with the environment, the working medium is changed into a normal-temperature and normal-pressure state, and the organic Rankine cycle is completed.
The energy storage system comprises: the energy storage structure 24 and the high-temperature heat transfer pump system 25, the organic Rankine cycle system 26 that link with it respectively, the energy storage structure 24 includes: a latent heat storage tank 3 and a sensible heat storage tank 5, wherein: the latent heat storage tank 3 is connected to the high temperature heat transfer pump system 25 and the organic rankine cycle system 26, respectively, and the sensible heat storage tank 5 is connected to the high temperature heat transfer pump system 25 and the organic rankine cycle system 26, respectively.
The high temperature heat transfer pump system 25 includes: charge flowmeter 11, be used for improving precooling equipment 4, expansion valve 6, first heat exchanger 1 and the compressor 2 of heat-retaining efficiency that connect gradually, wherein: the compressor 2 and the charge flow meter 11 are respectively connected with the latent heat storage tank 3, and the precooling equipment 4 is connected with the sensible heat storage tank 5.
The organic rankine cycle system 26 includes: discharge flowmeter 12, expander 7, second heat exchanger 8, transfer pump 9 and the preheating device 10 that is used for improving heat exchange efficiency that connect gradually, wherein: the preheating device 10 is connected to the latent heat storage tank 3 and the sensible heat storage tank 5, respectively, and the discharge flow meter 12 is connected to the latent heat storage tank 3.
The sensible heat storage tank 5 comprises a common heat storage medium, a high-temperature working medium is further cooled through the precooling equipment 4, and heat is transferred to the common heat storage medium in the sensible heat storage tank 5.
As shown in fig. 4, a supporting net 27 and a phase change heat storage medium 28 are arranged in the latent heat storage tank 3, a heat insulating layer 29 with a thickness of 10-20 cm is arranged outside the latent heat storage tank 3, and before the working medium enters the latent heat storage tank 3 to absorb heat, the working medium absorbs heat to a common heat storage medium stored in the sensible heat storage tank 5 through the preheating device 10, so that a preheating process is completed.
The heat storage temperature of the latent heat storage tank 3 is 110-200 ℃, and the heat storage temperature of the sensible heat storage tank 5 is 80-110 ℃.
The common heat storage medium in the sensible heat storage tank 5 comprises: stone, high pressure water, trans-1-chloro-2-phenylthiocyclohexane, 1-chloro-3, 3, 3-trifluoroprop-1-ene (R1233ZD), fluorinated liquid (NOVEC649) or cyclopentane.
The phase change temperature of the phase change heat storage medium of the latent heat storage tank 3 is 100-180 ℃, and the method specifically comprises the following steps: LiNO with phase transition temperature of 133 DEG C 3 -KNO 3 Mixed salt, KNO with a phase transition temperature of 149 DEG C 2 -NaNO 3 The mixed salt or HCOONa-HCOOK with the phase transition temperature of 176 ℃ is selected, and LiNO with the phase transition temperature of 133 ℃ is adopted in the embodiment 3 -KNO 3 Mixing the salts.
The compressor compresses the working medium to make the working medium in a subcritical state and the critical temperature T of the working medium cirt >145 ℃ and critical pressure P crit <3MPa, the compression ratio is more than 4, and the expansion ratio of the expansion machine to the working medium is more than 4, so that the working medium is ensured to be in a subcritical state, and isothermal heat transfer is realized in the latent heat storage tank 3.
In this embodiment, the compressor and the expander are a reversible reciprocating compressor and expander, the compression ratio is 5, and the expansion ratio is 5.
The working medium can adopt different working media in different cycles, for example, R-1233zd (E) or R-1234ze (Z) is adopted in a high-temperature heat transfer pump cycle, butylene (Butene), water or R-1233zd (E) is adopted in an organic Rankine cycle, and the same working medium is adopted in the embodiment: r-1233zd (E).
The default ambient temperature of the first heat exchanger and the second heat exchanger is 25 ℃.
The heat source is industrial waste heat or waste heat of cement, electric power, chemical industry and the like.
The temperature of the heat source is 80-110 ℃.
The electric energy comprises renewable energy power generation and power grid surplus power, and the renewable energy power generation is wind power generation, photovoltaic power generation, hydroelectric power generation or tidal power generation.
The electricity storage method further comprises the step of utilizing surplus electric energy, specifically: the compressor is charged, and the working medium is converted into electric energy through the generator to supplement the shortage of the electric energy during the peak time of electricity consumption.
As shown in fig. 2, in the charging process, industrial waste heat or waste heat heats the working medium at an initial state, the working medium enters the compressor through the first charging loop 13, the compressor compresses the working medium into a high-temperature and high-pressure state, the working medium enters the latent heat storage tank 3, heat is transferred to the phase change heat storage medium, the phase change heat storage medium stores energy through phase change, the flow in the loop is controlled through a valve of the latent heat storage tank 3, the working medium flows out of the latent heat storage tank 3 after heat exchange is completed, and the flow of the working medium is detected through the charging flowmeter 11; the working medium is converted into high-pressure gas, the temperature of the working medium is still higher than the ambient temperature at the moment, a large temperature difference exists, the working medium enters the precooling equipment 4 of the high-temperature heat transfer pump system 25 to be cooled, and the precooling equipment 4 stores the heat in high-pressure water in the sensible heat storage tank 5; the high-pressure working fluid enters an expansion valve 6 and expands to a state of normal pressure and normal temperature, and one-time charging energy storage circulation is completed.
As shown in fig. 3, in the discharging process, after the working medium with the initial state of ambient temperature and pressure enters the transfer pump 9, the working medium is changed into a normal-temperature high-pressure state, and then enters the preheating device 10 of the organic rankine system 24, absorbs the heat stored in the sensible heat storage tank 5 during the charging process by the high-pressure water, and enters the latent heat storage tank 3 to absorb the latent heat stored in the phase change material, and when the working medium flows out of the latent heat storage tank 3, the working medium is changed into a high-temperature high-pressure state, and the flow rate of the working medium is detected by the discharge flow meter 12; the working medium enters an expansion machine 7 through a pipeline to do work, the working medium is converted into electric energy through a generator to do work, the working medium is in a normal pressure state at the moment, but the temperature is still higher than the ambient temperature, the working medium enters a second heat exchanger 8, the heat generated irreversibly is discharged, the working medium is changed into a normal temperature and normal pressure state, and one-time discharge circulation is completed.
As shown in fig. 2, in the charging process, if the second charging circuit 14 and the third charging circuit 15 are used, the working fluid after heat exchange generates a certain pressure loss, flow rate change, and imbalance of the total mass of the working fluid in the latent heat storage tank, and is automatically adjusted by a valve; the discharge process of fig. 3 is the same as described above.
The device has the electricity storage efficiency of 0.5-0.9, the energy storage efficiency of over 100 percent, the isentropic efficiency of 0.8-0.9 and the energy storage density of 180MJ/m 3 ～850.62MJ/m 3 。
Compared with the prior art, the device has the advantages that the fire efficiency and the energy storage density are obviously improved, and under the same operation condition, the energy storage density is 65.7-88.8 MJ/m from the state without the phase change process 3 Increased to 180MJ/m to increase the phase transition process 3 ～850.62MJ/m 3 And the efficiency of each part of the system for ignition is also improved to more than 50 percent.
In summary, the invention adopts an energy storage mode and a system of latent heat storage and sensible heat storage combined by the latent heat storage tank containing the phase change material and the sensible heat storage tank containing the sensible heat material, can meet the demand of combined supply of heat and electricity, not only can supply power to an external power grid, but also can supply hot water and high-temperature steam to a heat user after supplying power, and obviously improves the utilization efficiency of energy.
The foregoing embodiments may be modified in many different ways by one skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and not by the preceding embodiments, and all embodiments within their scope are intended to be limited by the scope of the invention.
Claims (4)
1. The electricity storage method of the energy storage system based on the high-temperature heat transfer pump and the organic Rankine cycle is characterized in that after waste heat and waste heat are absorbed through a working medium in an electricity storage stage and are compressed to a high-temperature high-pressure state by a compressor, heat is stored in a latent heat storage tank and a sensible heat storage tank, and then circulation of the high-temperature heat transfer pump system is completed through an expansion valve; in the discharging stage, heat in a sensible heat storage tank and a latent heat storage tank is absorbed through a working medium and reaches a high-temperature and high-pressure state, and then an expander outputs energy to drive a generator to generate power so as to complete the cycle of the organic Rankine cycle system;
latent heat storage jar link to each other with high temperature heat transfer pump system and organic rankine cycle system respectively, sensible heat storage jar links to each other with high temperature heat transfer pump system and organic rankine cycle system respectively, wherein: the high temperature heat transfer pump system includes: the charge flowmeter that connects gradually, be used for improving precooling equipment, expansion valve, first heat exchanger and the compressor of heat-retaining efficiency, wherein: the compressor and the charging flowmeter are respectively connected with the latent heat storage tank, and the precooling equipment is connected with the sensible heat storage tank; an organic Rankine cycle system includes: discharge flowmeter, expander, second heat exchanger, transmission pump that connect gradually and be used for improving heat exchange efficiency's preheating apparatus, wherein: the preheating device is respectively connected with the latent heat storage tank and the sensible heat storage tank, and the discharge flow meter is connected with the latent heat storage tank;
the sensible heat storage tank is internally provided with a common heat storage medium, wherein: precooling equipment cools a high-temperature working medium, and a common heat storage medium receives heat in the working medium;
latent heat storage jar built-in phase transition heat-retaining medium, wherein: before entering a latent heat storage tank to absorb heat, the working medium absorbs heat to a common heat storage medium stored in a sensible heat storage tank through preheating equipment to finish a preheating process;
the electricity storage method comprises the following steps: a charging process and a discharging process;
the charging process specifically comprises the following steps: working medium at ambient temperature and pressure absorbs heat to a low-temperature heat source and is compressed into a high-temperature and high-pressure state, then enters a latent heat storage tank to release heat to a phase-change heat storage medium and enters precooling equipment of a high-temperature heat transfer pump system to transmit redundant heat to a common heat storage medium in a sensible heat storage tank, and after heat exchange is completed, the high-pressure working medium enters an expansion valve and is expanded into a normal-temperature and normal-pressure state to complete a primary energy storage cycle process;
the discharge process specifically comprises the following steps: working medium at ambient temperature and pressure absorbs heat of a sensible heat storage tank and a latent heat storage tank through the action of a transmission pump, the working medium is changed into a high-temperature high-pressure state, the working medium enters an expansion machine to do work, the working medium does work through a generator and is converted into electric energy, the problems of insufficient electric energy and intermittent generation of renewable energy sources during power consumption peak are solved, then heat is exchanged with the environment, heat generated irreversibly is discharged, the working medium is changed into a normal-temperature normal-pressure state, and one-time discharge circulation is completed.
2. The method of claim 1, wherein the common heat storage medium comprises: stone, high pressure water, trans-1-chloro-2-phenylthiocyclohexane, NOVEC649 or cyclopentane;
the phase-change heat storage medium comprises: LiNO with a phase transition temperature of 133 DEG C 3 -KNO 3 Mixed salt, KNO with a phase transition temperature of 149 DEG C 2 -NaNO 3 Mixing salt or selecting HCOONa-HCOOK with phase transition temperature of 176 ℃;
the temperature of the heat source is 70-110 ℃; the heat storage temperature of the latent heat storage tank is 110-200 ℃, and the heat storage temperature of the sensible heat storage tank is 80-110 ℃;
the phase change temperature of the phase change heat storage medium of the latent heat storage tank is 100-180 ℃.
3. The method for storing electricity in an energy storage system based on a HTP and an ORC as claimed in claim 1, wherein the compressor compresses the working medium to a subcritical state at a critical temperature T cirt >145 ℃ and critical pressure P crit <3MPa, and the compression ratio is more than 4; the expansion ratio of the expansion machine to the working medium is more than 4.
4. The method of claim 1, further comprising using excess electrical energy to supply stored energy to drive the compressor, and converting work from the working medium to work on the expander by a generator to electrical energy to supplement electrical energy during peak power consumption.
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