CN114709934A - Normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system and method - Google Patents
Normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system and method Download PDFInfo
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- CN114709934A CN114709934A CN202210356860.3A CN202210356860A CN114709934A CN 114709934 A CN114709934 A CN 114709934A CN 202210356860 A CN202210356860 A CN 202210356860A CN 114709934 A CN114709934 A CN 114709934A
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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
- H02J15/00—Systems for storing electric energy
- H02J15/006—Systems for storing electric energy in the form of pneumatic energy, e.g. compressed air energy storage [CAES]
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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
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
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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
Abstract
The invention provides a normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system and a method, wherein one path of outlet of a compressor is sequentially connected with a hot side inlet of an energy storage heat exchanger, and the other path of outlet of the compressor is connected with a hot side inlet of a heat regenerator; the hot side outlet of the energy storage heat exchanger is sequentially connected with the high-pressure storage tank, the energy release heat exchanger and the hot side inlet of the cooler, and the cold side outlet of the heat regenerator is connected with the inlet of the compressor; the outlet of the cold accumulator is connected with the inlets of the energy storage heat exchanger, the heat accumulator, the heat pump and the cold accumulator in sequence, and the heat pump is connected with the cooler and the energy release heat exchanger respectively. The energy storage system of the invention can increase the compression work of unit working medium and reduce the flow of the working medium by using surplus electric power to drive the compressor to compress the gaseous working medium after throttling, reducing the pressure and heating and gasifying the liquid low-pressure mixed working medium, thereby reducing the storage capacity of the working medium, further reducing the volume of the storage tank and improving the energy storage density.
Description
Technical Field
The invention belongs to the technical field of energy storage, and relates to a normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system and method.
Background
In order to reduce the emission of pollutants and carbon dioxide, renewable energy sources in China are rapidly developed, and the installed capacity of new energy sources such as photovoltaic power generation and wind power generation is rapidly increased. However, the new energy is greatly influenced by weather, the output has the problems of intermittence, instability and the like, and the safety and stable operation of a power grid are influenced by surfing the internet. Therefore, the new energy needs to be matched with an energy storage technology, unstable and residual renewable energy power is stored, and the power is stably output when needed, so that the problem of large-scale renewable energy consumption is solved.
The carbon dioxide is non-toxic and pollution-free, has stable physical properties, abundant reserves, easy acquisition, moderate critical point of 31.1 ℃, 7.38MPa and easy compression. In addition, the supercritical carbon dioxide has higher density, so that the volume of the equipment can be obviously reduced, and the system is more compact. Therefore, a mechanical energy storage system using carbon dioxide as a working medium is provided for large-scale energy storage. However, for the existing compression transcritical carbon dioxide energy storage system, because the critical temperature of the working medium is low, the working medium is difficult to be condensed by the normal-temperature cooling medium, extra energy consumption is needed for refrigeration, and the energy storage efficiency is reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system and method.
The invention is realized by the following technical scheme:
a normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system comprises,
the system comprises a compressor, an energy storage heat exchanger, a high-pressure storage tank, an energy release heat exchanger, a turbine, a cooler, a low-pressure storage tank, a heat regenerator, a heat storage tank, a cold storage tank and a heat pump;
the outlet of the compressor is divided into two paths, one path of outlet of the compressor is sequentially connected with the hot side inlet of the energy storage heat exchanger, and the other path of outlet of the compressor is connected with the hot side inlet of the heat regenerator; the hot side outlet of the energy storage heat exchanger is sequentially connected with the high-pressure storage tank, the energy release heat exchanger and the inlet of the turbine, the outlet of the turbine is connected with the hot side inlet of the cooler, the hot side outlet of the cooler is sequentially connected with the low-pressure storage tank and the cold side inlet of the heat regenerator, and the cold side outlet of the heat regenerator is connected with the inlet of the compressor; the outlet of the cold accumulator is connected with the cold side inlet of the energy storage heat exchanger, the cold side outlet of the energy storage heat exchanger is connected with the inlet of the heat accumulator, the outlet of the heat accumulator is sequentially connected with the heat pump and the inlet of the cold accumulator, and the heat pump is respectively connected with the cooler and the energy release heat exchanger.
Preferably, the heat absorption end of the heat pump is divided into two paths, wherein an inlet of one path of heat absorption end of the heat pump is connected with an outlet of the heat accumulator, and an outlet of one path of heat absorption end of the heat pump is connected with an inlet of the cold accumulator; and the other path of heat absorption end inlet of the heat pump is connected with the cold side outlet of the cooler, and the other path of heat absorption end outlet of the heat pump is connected with the cold side inlet of the cooler.
Preferably, the heat release end inlet of the heat pump is connected with the hot side outlet of the energy release heat exchanger, and the heat release end outlet of the heat pump is connected with the hot side inlet of the energy release heat exchanger.
Preferably, a throttle valve is arranged between the low-pressure storage tank and the regenerator.
Preferably, the carbon dioxide mixed working medium comprises carbon dioxide and a doping working medium; the doping working medium comprises at least one of SF6, R161 and R32.
Preferably, the doping working medium accounts for 10-40% of the mass of the carbon dioxide mixed working medium.
Preferably, the carbon dioxide mixed working medium stored in the high-pressure storage tank and the low-pressure storage tank is in a liquid state.
Preferably, the working pressure of the high-pressure storage tank is 15-30 MPa, and the working temperature is 25-40 ℃.
Preferably, the working pressure of the low-pressure storage tank is 6-8 MPa, and the working temperature is 25-40 ℃.
A normal temperature liquid compressed carbon dioxide mixed working medium energy storage method comprises,
during energy storage, the low-pressure carbon dioxide mixed working medium in the low-pressure storage tank is heated by the high temperature of the inlet of the heat regenerator and the compressor to form gaseous carbon dioxide mixed working medium, then enters the compressor for compression, pressure boosting and temperature rising, is divided into two paths, is condensed and liquefied in the heat regenerator and the energy storage heat exchanger respectively, and then is stored in the high-pressure storage tank; after absorbing heat in the energy storage heat exchanger, the cold accumulation medium in the cold accumulator enters the heat accumulator to store heat;
when energy is released, the high-pressure carbon dioxide mixed working medium in the high-pressure storage tank is heated in the energy-releasing heat exchanger, enters the turbine to do work and generate electricity to release energy; carbon dioxide mixed working medium gas discharged by the turbine is cooled to be liquid in a cooler and stored in a low-pressure storage tank; the heat pump extracts heat from the heat storage medium in the heat accumulator and the gaseous carbon dioxide mixed working medium discharged by the cooler, converts the heat into high-temperature heat, and heats the carbon dioxide mixed working medium in the energy release heat exchanger.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system and method, wherein the carbon dioxide mixed working medium energy storage method improves the critical temperature of a mixed working medium by mixing other substances in carbon dioxide, so that the mixed working medium can be condensed by a normal-temperature cooling medium and stored in a liquid state, and the problem of low energy storage density is effectively solved. Meanwhile, after the energy storage system throttles, reduces the pressure of the liquid low-pressure mixed working medium, heats and gasifies the liquid low-pressure mixed working medium, the surplus electric power is used for driving the compressor to compress the gaseous working medium, so that the compression work of the unit working medium can be increased, the flow of the working medium is reduced, the storage amount of the working medium is reduced, the volume of the storage tank is reduced, and the energy storage density is improved; in addition, the heat pump absorbs low-temperature heat from turbine exhaust and heat storage media, converts the low-temperature heat into high-temperature heat, and is used for heating a turbine inlet working medium, so that the temperature of the turbine inlet is increased, the energy loss of a system can be reduced, and the energy storage efficiency of the system is increased;
furthermore, the invention adopts the mixed working medium with higher critical temperature, can be cooled to liquid state for storage at normal temperature, and can improve the energy storage density.
Furthermore, the system has the advantages of small equipment volume, simple and compact system, high flexibility and the like.
Drawings
FIG. 1 is a schematic diagram of a normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system.
In the figure: the system comprises a compressor 1, an energy storage heat exchanger 2, a high-pressure storage tank 3, an energy release heat exchanger 4, a turbine 5, a cooler 6, a low-pressure storage tank 7, a throttling valve 8, a heat regenerator 9, a heat storage tank 10, a cold storage tank 11 and a heat pump 12;
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
A normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system comprises,
the system comprises a compressor 1, an energy storage heat exchanger 2, a high-pressure storage tank 3, an energy release heat exchanger 4, a turbine 5, a cooler 6, a low-pressure storage tank 7, a heat regenerator 9, a heat storage tank 10, a cold storage tank 11 and a heat pump 12;
the outlet of the compressor 1 is divided into two paths, one path of outlet of the compressor 1 is sequentially connected with the hot side inlet of the energy storage heat exchanger 2, and the other path of outlet of the compressor 1 is connected with the hot side inlet of the heat regenerator 9; the hot side outlet of the energy storage heat exchanger 2 is sequentially connected with the high-pressure storage tank 3, the energy release heat exchanger 4 and the inlet of the turbine 5, the outlet of the turbine 5 is connected with the hot side inlet of the cooler 6, the hot side outlet of the cooler 6 is sequentially connected with the low-pressure storage tank 7 and the cold side inlet of the heat regenerator 9, and the cold side outlet of the heat regenerator 9 is connected with the inlet of the compressor 1;
the outlet of the cold accumulator 11 is connected with the inlet of the cold side of the energy storage heat exchanger 2, the outlet of the cold side of the energy storage heat exchanger 2 is connected with the inlet of the heat accumulator 10, the outlet of the heat accumulator 10 is sequentially connected with the heat pump 12 and the inlet of the cold accumulator 11, and the heat pump 12 is respectively connected with the cooler 6 and the energy release heat exchanger 4.
The heat pump is a device for transferring heat energy of a low-temperature heat source to a high-temperature heat source to realize refrigeration and heating. When the heat pump works, the heat pump consumes a part of energy, excavates the energy stored in the environment medium, improves the temperature through the heat transfer working medium circulating system for utilization, and only consumes a small part of the output work of the whole heat pump device, so that a large amount of high-grade energy can be saved by adopting the heat pump technology. The heat absorption end of the heat pump 12 is divided into two paths, wherein the inlet of one path of heat absorption end of the heat pump 12 is connected with the outlet of the heat accumulator 10, and the outlet of one path of heat absorption end of the heat pump 12 is connected with the inlet of the cold accumulator 11; and the inlet of the other path of heat absorption end of the heat pump 12 is connected with the cold side outlet of the cooler 6, and the outlet of the other path of heat absorption end of the heat pump 12 is connected with the cold side inlet of the cooler 6.
And an inlet of a heat release end of the heat pump 12 is connected with an outlet of the hot side of the energy release heat exchanger 4, and an outlet of the heat release end of the heat pump 12 is connected with an inlet of the hot side of the energy release heat exchanger 4.
As the preferred embodiment of the invention, the carbon dioxide mixed working medium stored in the high-pressure storage tank 3 and the low-pressure storage tank 7 is liquid, the density of the liquid working medium is high, the volume of the high-pressure storage tank 3 and the volume of the low-pressure storage tank 7 can be reduced, and the energy storage density can be improved.
As a preferred embodiment of the invention, a throttle valve 8 is arranged between the low-pressure storage tank 7 and the heat regenerator 9, the throttle valve 8 throttles and reduces the pressure of the working medium, a part of the working medium is shunted from the outlet of the compressor 1 and enters the heat regenerator 9 for heating the throttled working medium, the gaseous working medium has larger unit compression work and can reduce the flow rate of the working medium, thereby reducing the volume of the stored working medium and improving the energy storage density.
As a preferred embodiment of the invention, the heat pump 12 takes heat from the medium of the heat accumulator 10 and the exhaust gas of the turbine 5, and then releases the heat in the energy release heat exchanger 4 for heating the working medium, so that the energy loss can be reduced, the inlet temperature of the turbine 5 can be increased, and the energy storage efficiency can be effectively improved.
As a preferred embodiment of the invention, the working pressure of the high-pressure storage tank 3 is 15-30 MPa, and the working temperature is 25-40 ℃. The working pressure of the low-pressure storage tank 7 is 6-8 MPa, and the working temperature is 25-40 ℃.
As a preferred embodiment of the invention, the carbon dioxide mixed working medium comprises carbon dioxide and a doping working medium; the doping working medium comprises at least one of SF6 (sulfur hexafluoride), R161 (fluoroethane) and R32 (difluoromethane). The doped working medium accounts for 10-40% of the mass of the carbon dioxide mixed working medium. Wherein R32 has the formula CH2F2It is non-explosive, non-toxic, inflammable and safe. The energy-saving, green and harmless ozone layer of R32 also becomes one of the new stars of modern refrigerants. SF6 (sulfur hexafluoride) is used as refrigerant in the refrigeration industry, and the refrigeration range can be between-45 ℃ and 0 ℃.
A normal temperature liquid compressed carbon dioxide mixed working medium energy storage method comprises,
during energy storage, the low-pressure carbon dioxide mixed working medium in the low-pressure storage tank 7 is heated by the high temperature of the heat regenerator 9 and the inlet of the compressor 1 to form gaseous carbon dioxide mixed working medium, and then enters the compressor 1 for compression, pressure rise and temperature rise, and then is divided into two paths, condensed and liquefied in the heat regenerator 9 and the energy storage heat exchanger 2 respectively, and then stored in the high-pressure storage tank 3; after absorbing heat in the energy storage heat exchanger 2, the cold storage medium in the cold accumulator 11 enters the heat accumulator 10 to store heat;
during energy release, the high-pressure carbon dioxide mixed working medium in the high-pressure storage tank 3 is heated in the energy release heat exchanger 4, enters the turbine 5 to do work and generates electricity to release energy; carbon dioxide mixed working medium gas discharged by the turbine 5 is cooled to be liquid in the cooler 6 and stored in the low-pressure storage tank 7; the heat pump 12 extracts heat from the heat storage medium in the heat accumulator 10 and the carbon dioxide mixed working medium discharged from the cooler 6, converts the heat into high-temperature heat, and heats the carbon dioxide mixed working medium in the energy release heat exchanger 4.
The specific preferred implementation process is as follows:
as shown in fig. 1, a normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system comprises an energy storage system, an energy release system and an energy storage system;
the energy storage system comprises a low-pressure storage tank 7, a throttle valve 8, a heat regenerator 9, a compressor 1, an energy storage heat exchanger 2 and a high-pressure storage tank 3; 7 exports of low pressure storage tank are linked together with 8 imports of choke valve, and 8 exports of choke valve are linked together with 9 cold testing imports of regenerator, and 9 cold testing exports of regenerator are linked together with 1 import of compressor, and 1 exports of compressor divide into two tunnel: one path is communicated with the inlet at the hot side of the energy storage heat exchanger 2, and the outlet at the hot side of the energy storage heat exchanger 2 is communicated with the inlet of the high-pressure storage tank 3; the other path is communicated with an inlet at the hot side of the heat regenerator 9, and an outlet at the hot side of the heat regenerator 9 is communicated with an inlet of the high-pressure storage tank 3.
The energy release system comprises a high-pressure storage tank 3, an energy release heat exchanger 4, a turbine 5, a cooler 6 and a low-pressure storage tank 7; the outlet of the high-pressure storage tank 3 is communicated with the inlet of the energy-releasing heat exchanger 4, the outlet of the energy-releasing heat exchanger 4 is communicated with the inlet of the turbine 5, the outlet of the turbine 5 is communicated with the inlet of the hot side of the cooler 6, and the outlet of the hot side of the cooler 6 is communicated with the low-pressure storage tank 7;
the energy storage system comprises an energy storage heat exchanger 2, a heat storage tank 10, a cold storage tank 11, a heat pump 12, an energy release heat exchanger 4 and a cooler 6; an outlet of the regenerator 11 is communicated with a cold side inlet of the energy storage heat exchanger 4, a cold side outlet of the energy storage heat exchanger 4 is communicated with an inlet of the heat accumulator 10, an outlet of the heat accumulator 10 and an inlet of the regenerator 11 are respectively communicated with a heat absorption end of the heat pump 12, a cold side inlet and a cold side outlet of the cooler 6 are respectively communicated with a heat absorption end of the heat pump 12, and a heat release end of the heat pump 12 is communicated with a hot side inlet and a hot side outlet of the energy release heat exchanger 4.
As shown in fig. 1, in the operation method of a normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system, during energy storage, low-pressure carbon dioxide in a low-pressure storage tank 7 is throttled and depressurized through a throttle valve 8, a working medium is partially gasified, then is heated by a regenerator 9 by using a working medium with a higher temperature at the outlet of a compressor 1 to become a gaseous working medium, then enters the compressor 1, is divided into two paths after the surplus electric power drives the compressor 1 to compress, boost and heat the working medium, is condensed and liquefied in the regenerator 9 and an energy storage heat exchanger 2 respectively, and then is stored in a high-pressure storage tank 3; after absorbing heat in the energy storage heat exchanger 2, the medium in the cold accumulator 11 enters the heat accumulator 10;
during energy release, high-pressure carbon dioxide in the high-pressure storage tank 2 is heated in the energy-releasing heat exchanger 4, enters the turbine 5 to do work and generate electricity to release energy; the exhaust gas of the turbine 5 is cooled to liquid state in a cooler 6 and stored in a low-pressure storage tank 7; the heat pump 12 extracts heat from the heat storage medium in the heat accumulator 10 and the exhaust gas from the cooler 6 and converts it into high temperature heat, heating the medium in the energy-releasing heat exchanger 4.
Claims (10)
1. A normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system is characterized by comprising,
the system comprises a compressor (1), an energy storage heat exchanger (2), a high-pressure storage tank (3), an energy release heat exchanger (4), a turbine (5), a cooler (6), a low-pressure storage tank (7), a heat regenerator (9), a heat storage tank (10), a cold storage tank (11) and a heat pump (12);
the outlet of the compressor (1) is divided into two paths, one path of outlet of the compressor (1) is connected with the hot side inlet of the energy storage heat exchanger (2), and the other path of outlet of the compressor (1) is connected with the hot side inlet of the heat regenerator (9); a hot side outlet of the energy storage heat exchanger (2) is sequentially connected with inlets of a high-pressure storage tank (3), an energy release heat exchanger (4) and a turbine (5), an outlet of the turbine (5) is connected with a hot side inlet of a cooler (6), a hot side outlet of the cooler (6) is sequentially connected with a low-pressure storage tank (7) and a cold side inlet of a heat regenerator (9), and a cold side outlet of the heat regenerator (9) is connected with an inlet of a compressor (1); the outlet of the cold accumulator (11) is connected with the inlet of the cold side of the energy storage heat exchanger (2), the outlet of the cold side of the energy storage heat exchanger (2) is connected with the inlet of the heat accumulator (10), the outlet of the heat accumulator (10) is sequentially connected with the inlets of the heat pump (12) and the cold accumulator (11), and the heat pump (12) is respectively connected with the cooler (6) and the energy release heat exchanger (4).
2. A normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system according to claim 1, wherein the heat absorption end of the heat pump (12) is divided into two paths, the inlet of the heat absorption end of the heat pump (12) is connected with the outlet of the heat accumulator (10), and the outlet of the heat absorption end of the heat pump (12) is connected with the inlet of the cold accumulator (11); and the inlet of the other path of heat absorption end of the heat pump (12) is connected with the cold side outlet of the cooler (6), and the outlet of the other path of heat absorption end of the heat pump (12) is connected with the cold side inlet of the cooler (6).
3. The normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system according to claim 1, wherein an inlet of a heat release end of the heat pump (12) is connected with an outlet of a hot side of the energy release heat exchanger (4), and an outlet of the heat release end of the heat pump (12) is connected with an inlet of the hot side of the energy release heat exchanger (4).
4. The normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system according to claim 1, wherein a throttle valve (8) is arranged between the low-pressure storage tank (7) and the heat regenerator (9).
5. The normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system according to claim 1, wherein the carbon dioxide mixed working medium comprises carbon dioxide and a doped working medium; the doping working medium comprises at least one of SF6, R161 and R32.
6. The normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system according to claim 5, wherein the doped working medium accounts for 10-40% of the mass of the carbon dioxide mixed working medium.
7. The normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system according to claim 1, wherein the carbon dioxide mixed working medium stored in the high-pressure storage tank (3) and the low-pressure storage tank (7) is in a liquid state.
8. The normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system according to claim 1, wherein the working pressure of the high-pressure storage tank (3) is 15-30 MPa, and the working temperature is 25-40 ℃.
9. The normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system according to claim 1, wherein the working pressure of the low-pressure storage tank (7) is 6-8 MPa, and the working temperature is 25-40 ℃.
10. A normal-temperature liquid compressed carbon dioxide mixed working medium energy storage method is characterized in that the carbon dioxide mixed working medium energy storage system based on any one of claims 1 to 9 comprises,
during energy storage, the low-pressure carbon dioxide mixed working medium in the low-pressure storage tank (7) is heated by the high temperature of the inlets of the heat regenerator (9) and the compressor (1) to form gaseous carbon dioxide mixed working medium, and then the gaseous carbon dioxide mixed working medium enters the compressor (1) to be compressed, boosted and heated, is divided into two paths, is condensed and liquefied in the heat regenerator (9) and the energy storage heat exchanger (2) respectively, and then is stored in the high-pressure storage tank (3); after absorbing heat in the energy storage heat exchanger (2), the cold storage medium in the cold storage device (11) enters the heat storage device (10) to store heat;
during energy release, the high-pressure carbon dioxide mixed working medium in the high-pressure storage tank (3) is heated in the energy release heat exchanger (4) and then enters the turbine (5) to do work and generate electricity to release energy; carbon dioxide mixed working medium gas discharged by the turbine (5) is cooled to be liquid in the cooler (6) and stored in the low-pressure storage tank (7); the heat pump (12) extracts heat from the heat storage medium in the heat accumulator (10) and the gaseous carbon dioxide mixed working medium discharged from the cooler (6), converts the heat into high-temperature heat, and heats the carbon dioxide mixed working medium in the energy release heat exchanger (4).
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| PCT/CN2022/142675 WO2023193486A1 (en) | 2022-04-06 | 2022-12-28 | Normal-temperature liquid compressed carbon dioxide mixed working fluid energy storage system and method |
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| CN115182799A (en) * | 2022-07-29 | 2022-10-14 | 西安热工研究院有限公司 | Air-cooled condensed and evaporated liquid CO 2 Mixture energy storage system and method |
| WO2023193486A1 (en) * | 2022-04-06 | 2023-10-12 | 西安热工研究院有限公司 | Normal-temperature liquid compressed carbon dioxide mixed working fluid energy storage system and method |
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| CN117578744B (en) * | 2024-01-16 | 2024-03-26 | 合肥通用机械研究院有限公司 | Compressed air energy storage power generation system and method for coupled cold energy recovery |
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| CN107035447B (en) * | 2017-04-14 | 2018-12-07 | 南京航空航天大学 | Compress supercritical carbon dioxide accumulation of energy hold over system and its working method |
| CN109026241B (en) * | 2018-08-30 | 2023-12-08 | 中国科学院工程热物理研究所 | Heat pump compressed air energy storage system |
| US11193421B2 (en) * | 2019-06-07 | 2021-12-07 | Saudi Arabian Oil Company | Cold recycle process for gas turbine inlet air cooling |
| CN111140298B (en) * | 2020-01-07 | 2024-01-26 | 上海锅炉厂有限公司 | Distributed cogeneration compressed air energy storage system |
| CN113914952B (en) * | 2021-10-15 | 2024-01-23 | 西安热工研究院有限公司 | Transcritical carbon dioxide energy storage coupling steam turbine power generation peak regulation system and operation method |
| CN114111413B (en) * | 2021-11-25 | 2023-10-27 | 青岛科技大学 | Compression energy storage system adopting carbon dioxide mixed working medium and working method thereof |
| CN114709934A (en) * | 2022-04-06 | 2022-07-05 | 西安热工研究院有限公司 | Normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system and method |
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| WO2023193486A1 (en) * | 2022-04-06 | 2023-10-12 | 西安热工研究院有限公司 | Normal-temperature liquid compressed carbon dioxide mixed working fluid energy storage system and method |
| CN115182799A (en) * | 2022-07-29 | 2022-10-14 | 西安热工研究院有限公司 | Air-cooled condensed and evaporated liquid CO 2 Mixture energy storage system and method |
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