CN110374839B - Liquefied air energy storage system and method for cold storage by using pressurized liquid propane - Google Patents
Liquefied air energy storage system and method for cold storage by using pressurized liquid propane Download PDFInfo
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- CN110374839B CN110374839B CN201910692165.2A CN201910692165A CN110374839B CN 110374839 B CN110374839 B CN 110374839B CN 201910692165 A CN201910692165 A CN 201910692165A CN 110374839 B CN110374839 B CN 110374839B
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- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 239000001294 propane Substances 0.000 title claims abstract description 66
- 239000007788 liquid Substances 0.000 title claims abstract description 53
- 238000004146 energy storage Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 14
- 238000011084 recovery Methods 0.000 claims abstract description 71
- 238000009825 accumulation Methods 0.000 claims abstract description 27
- 238000010248 power generation Methods 0.000 claims abstract description 26
- 238000005338 heat storage Methods 0.000 claims abstract description 24
- 238000007906 compression Methods 0.000 claims abstract description 14
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000005482 strain hardening Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004887 air purification Methods 0.000 claims description 5
- 238000002309 gasification Methods 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Classifications
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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
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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
-
- 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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/16—Filtration; Moisture separation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention provides a liquefied air energy storage system for cold storage by using pressurized liquid propane, and belongs to the technical field of renewable energy sources. The system comprises an air compression and heat recovery system, an air liquefaction system, an air expansion power generation system and a pressurized liquid propane cold accumulation system. When the energy is stored, the air is compressed, the generated compression heat is stored in the compression heat storage tank, and the high-pressure air is then sent into the air liquefying system, and the cold energy stored in the propane cryogenic tank is fully utilized for cooling. When releasing energy, the liquid air is pressurized by the pressurizing pump and gasified and heated by the gasifier, and the cold energy is recovered by the propane and stored in the pressurized liquid propane storage tank. The pressurized liquid propane is used as the cold accumulation working medium, the phase change does not occur in the cold accumulation process, the density of the cold accumulation working medium is high, the occupied area of the system is greatly reduced, and the system has the advantages of small cold energy loss, high response speed and the like.
Description
Technical Field
The invention relates to a liquefied air energy storage system and a method for cold storage by using pressurized liquid propane, and belongs to the technical field of renewable energy sources.
Background
In the existing energy storage technology, the compressed air energy storage is the only physical energy storage technology capable of realizing large-scale power grid electricity storage except pumped storage, and the compressed air energy storage technology not only can be applied to the storage of renewable energy sources, but also can be used for solving the problem of peak-valley difference of a power grid.
The traditional compressed air energy storage utilizes a compressor to compress air into a large-scale karst cave for storage, and utilizes fossil fuel combustion reheating to expand and apply work in the energy release stage, so that the energy storage device is suitable for a large-scale system, has low cost and long service life, but has the defects of limited construction sites and pollution caused by combustion of fossil energy.
The liquefied air energy storage system (LAES) stores air in liquid normal pressure or low pressure, so that the energy storage density is greatly improved, and meanwhile, the system construction cost and the occupied area are greatly reduced. The liquefied air energy storage system combines an air liquefaction subsystem, an energy storage subsystem and an expansion power generation subsystem: when storing energy, the electric energy compresses, cools and liquefies air in multiple stages, and simultaneously stores heat energy released in the process, and the heat energy can be used for heating the air when releasing energy; when releasing energy, the liquid air is pressurized and gasified to push the expansion generating set to generate electricity, and meanwhile, the cold energy in the gasification process is recovered and used for cooling air during energy storage.
In terms of cold energy recovery, a packed bed cold storage is currently commonly used by those skilled in the art. The cold energy in the gasification process is transferred to the rock or sand of the packed bed by using normal-temperature air, and the cold energy of the packed bed is brought out by using the normal-temperature air during liquefaction. The cold accumulation method takes air as an intermediate medium for directional transmission of cold energy, has the problems of higher cold energy loss, slow response in the process of storing and releasing cold energy, large temperature deviation in a packed bed and the like, can not meet the requirements of large-scale, high-efficiency and reliable energy storage, and is urgently required to develop a cold accumulation system with higher efficiency and quicker response.
Disclosure of Invention
The invention aims to solve the defects of a cold accumulation system in the existing liquefied air energy storage system, and development of a cold accumulation system with higher efficiency and quicker response is urgently needed.
In order to solve the above problems, the technical scheme adopted by the invention is to provide a liquefied air energy storage system for cold accumulation by using pressurized liquid propane, which comprises an air compression and heat recovery system, an air liquefaction system and an air expansion power generation system; the method is characterized in that: the system also comprises a pressurized liquid propane cold accumulation system for storing or releasing cold energy when the gaseous air and the liquid air are converted; an air liquefying system is arranged between the air compression and heat recovery system and the air expansion power generation system; a pressurized liquid propane cold accumulation system is arranged between the air liquefaction system and the air expansion power generation system.
Preferably, the air compression and heat recovery system comprises an air purification device, a compressor, a driving device, a heat recovery working medium normal temperature tank and a heat recovery working medium heat storage tank; a compressor and a driving device are arranged between the air purifying device and the heat recovery device; one end of the heat recovery working medium heat storage tank is connected with a reheater in the expansion generating set through a heat working medium pipeline, and the other end of the heat recovery working medium heat storage tank is connected with heat recovery equipment; and one end of the heat recovery working medium normal temperature tank is connected with a reheater in the expansion generating set through a heat working medium pipeline, and the other end of the heat recovery working medium normal temperature tank is connected with heat recovery equipment.
Preferably, the air liquefying system consists of a conventional air liquefying device; the air liquefying device comprises a liquid air storage tank, one end of the air liquefying device is connected with heat recovery equipment, and the other end of the air liquefying device is connected with a pressurizing pump.
Preferably, the air expansion power generation system comprises a booster pump, a gasifier and an expansion power generation unit; a gasifier is arranged between the booster pump and the expansion generating set.
Preferably, the pressurized liquid propane cold accumulation system comprises a propane normal temperature tank and a propane cryogenic tank; the propane normal temperature tank is connected with the gasifier through one end of the cold working medium pipeline, and the other end of the propane normal temperature tank is connected with the air liquefying device; the propane cryogenic tank is connected with the gasifier through one end of a cold working medium pipeline, and the other end of the propane cryogenic tank is connected with the air liquefying device.
Preferably, the heat recovery working medium adopts pressurized water or normal pressure heat conduction oil.
Preferably, the cold working medium adopts propane.
Preferably, a reheater is arranged in the expansion generating set, and a thermal working medium pipeline is arranged in the reheater.
The invention also provides a method for storing energy by using the pressurized liquid propane to store the liquefied air, which is characterized by comprising the following steps:
step 1: the air enters a compressor and a driving device after being purified by an air purifying device, and is pressurized to 3-6MPa.
Step 2: the compressed air is subjected to heat exchange and cooling with a working medium from a heat recovery working medium normal temperature tank through heat recovery equipment, the working medium is stored in a heat recovery working medium heat storage tank after being heated, the heat storage working medium is normal pressure heat conduction oil or pressurized water, and the heat storage temperature is more than 240 ℃.
Step 3: the cooled high-pressure air is further cooled and liquefied by an air liquefying device and stored in a liquid air storage tank, so that the energy storage process is completed.
Step 4: when releasing energy, the liquid air is sent into the gasifier to gasify and absorb heat after the pressure of the liquid air is increased to 8-14MPa by a booster pump; meanwhile, the pressurized liquid propane at normal temperature in the propane normal temperature tank is cooled to below-150 ℃ in the gasifier by heat release, and is stored in a propane cryogenic tank, and the cryogenic propane is used for cooling air in an energy storage stage by an air liquefying device; the cold accumulation system is in a pressurized state when in operation, and the pressure is between 1MPa and 1.5 MPa.
Step 5: the gasified air is subjected to power generation by an expansion power generator set, reheaters are arranged among various stages of the expansion power generator set, and the air is heated to more than 200 ℃ by utilizing heat recovery working medium in a heat recovery working medium heat storage tank, so that the power generation efficiency is improved, the final exhaust temperature is about 40-80 ℃, and the heat working medium returns to a heat recovery working medium normal-temperature tank after being cooled.
Compared with the prior art, the invention has the following beneficial effects:
1. the pressurized liquid propane is used as the cold accumulation working medium, the phase change does not occur in the cold accumulation process, the density of the cold accumulation working medium is high, and the occupied area of the system can be greatly reduced;
2. the pressurized liquid propane is used as the heat exchange medium of the cold accumulation system, and compared with the cold accumulation of the packed bed adopted in the prior art, the pressurized liquid propane has the advantages of small system cold energy loss, high response speed and the like.
Drawings
Fig. 1 is a schematic diagram of a liquefied air energy storage system for storing cold by using pressurized liquid propane according to the present invention.
Reference numerals: 1. air purification equipment 2, a compressor and a driving equipment 3, heat recovery equipment 4, a heat recovery working medium normal temperature tank 5, a heat recovery working medium heat storage tank 6, an air liquefying device 7, a booster pump 8, a gasifier 9, an expansion generating set 10, a propane normal temperature tank 11, a propane deep cooling tank
Detailed Description
In order to make the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below;
as shown in fig. 1, the present invention provides a liquefied air energy storage system for storing cold using pressurized liquid propane, comprising: an air compression and heat recovery system, an air liquefaction system, an air expansion power generation system and a pressurized liquid propane cold accumulation system. An air liquefying system is arranged between the air compression and heat recovery system and the air expansion power generation system; a pressurized liquid propane cold accumulation system is arranged between the air liquefaction system and the air expansion power generation system.
The air compression and heat recovery system comprises an air purification device 1, a compressor and driving device 2, a heat recovery device 3, a heat recovery working medium normal temperature tank 4 and a heat recovery working medium heat storage tank 5; a compressor and a driving device 2 are arranged between the air purifying device 1 and the heat recovery device 3; one end of the heat recovery working medium heat storage tank 5 is connected with a reheater in the expansion generating set 9 through a heat working medium pipeline, and the other end is connected with heat recovery equipment 3; one end of the heat recovery working medium normal temperature tank 4 is connected with a reheater in the expansion generating set 9 through a heat working medium pipeline, and the other end is connected with the heat recovery equipment 3. The air compression and heat recovery system is used for pressurizing air, collecting and storing heat generated in the compression process and heating the air during energy release; the air purification device 1 purifies air; the compressor and the driving device 2 compress air; the heat recovery device 3 cools the high-temperature high-pressure air by using the heat recovery working medium. The heat recovery working medium adopts pressurized water or normal pressure heat conduction oil, the working medium after normal temperature and temperature rise is respectively stored in a heat recovery working medium normal temperature tank 4 and a heat recovery working medium heat storage tank 5, and the transportation of the working medium is realized through a pump. The air liquefaction system consists of a conventional air liquefaction device 6 for converting incoming gaseous air into liquid air. The air liquefying device 6 comprises a liquid air storage tank, one end of the air liquefying device 6 is connected with the heat recovery equipment 3, and the other end of the air liquefying device is connected with the pressurizing pump 7. The air expansion power generation system comprises a booster pump 7, a gasifier 8 and an expansion power generation unit 9; a gasifier 8 is arranged between the booster pump 7 and the expansion generator set 9; the air expansion power generation system is used for pressurizing and gasifying the liquid air to generate power; the pressurization pump 7 pressurizes the liquefied air, and then the liquefied air absorbs heat, gasifies and heats up in the gasifier 8, and then enters the expansion generator set 9 to do work and generate electricity. The pressurized liquid propane cold accumulation system comprises a propane cryogenic tank 11 and a propane normal temperature tank 10; one end of the propane normal temperature tank 10 is connected with the gasifier 8 through a cold working medium pipeline, and the other end is connected with the air liquefying device 6; the propane cryogenic tank 11 is connected with the gasifier 8 through one end of a cold working medium pipeline, and the other end of the propane cryogenic tank is connected with the air liquefying device 6. The cold accumulation working medium is liquid propane, is in a pressurized state during operation, is stored in the propane normal temperature tank 10 and the propane cryogenic tank 11 respectively after normal temperature and temperature reduction, realizes the transportation of the working medium through a pump, and is used for storing or releasing cold energy during the conversion of gaseous air and liquid air. And a reheater is arranged in the expansion generating set 9, and the reheater heats air by utilizing the heat recovery working medium in the heat recovery working medium heat storage tank 5, and realizes the conveying of the working medium through a pump.
The working flow of the liquefied air energy storage system for storing cold by using the pressurized liquid propane is as follows:
during energy storage, air enters the compressor and the driving device 2 after passing through the air purifying device 1, is pressurized to 6MPa, then the compressed air exchanges heat with the working medium from the heat recovery working medium normal temperature tank 4 through the heat recovery device 3, and is cooled, the working medium is stored in the heat recovery working medium heat storage tank 5 after being heated, the heat storage working medium is normal pressure heat conduction oil or pressurized water, and the heat storage temperature can reach 250 ℃. The cooled high-pressure air is further cooled by an air liquefying device 6, liquefied and stored in a liquid air storage tank, wherein the storage temperature is minus 172 ℃ and the pressure is 0.7MPa.
When releasing energy, the liquid air is sent into the gasifier 8 after the pressure of the liquid air is increased to 10MPa by the pressure pump 7, the pressurized liquid propane with the temperature of about 20 ℃ in the propane normal temperature tank 10 is cooled to-150 ℃ in the gasifier 8 by heat release and stored in the propane cryogenic tank 11, and is used for cooling air in the energy storage stage of the air liquefying device 6. The cold accumulation system is in a pressurized state when in operation, and the pressure is between 1MPa and 1.5 MPa. The gasified air is subjected to power generation by an expansion generator set 9, reheaters are arranged among all stages of the expansion machine, and the air is heated to about 220 ℃ by using the thermal working medium in the thermal recovery working medium heat storage tank 5, so that the power generation efficiency is improved, the final exhaust temperature is about 60 ℃, and the thermal working medium returns to the thermal recovery working medium normal temperature tank 4 after being cooled.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.
Claims (5)
1. A liquefied air energy storage system for accumulating cold by using pressurized liquid propane comprises an air compression and heat recovery system, an air liquefying system and an air expansion power generation system; the method is characterized in that: the system also comprises a pressurized liquid propane cold accumulation system for storing or releasing cold energy when the gaseous air and the liquid air are converted; an air liquefying system is arranged between the air compression and heat recovery system and the air expansion power generation system; a pressurized liquid propane cold accumulation system is arranged between the air liquefaction system and the air expansion power generation system; the air compression and heat recovery system comprises an air purification device (1), a compressor and driving device (2), a heat recovery device (3), a heat recovery working medium normal temperature tank (4) and a heat recovery working medium heat storage tank (5); a compressor and a driving device (2) are arranged between the air purifying device (1) and the heat recovery device (3); one end of the heat recovery working medium heat storage tank (5) is connected with a reheater in the expansion generating set (9) through a heat working medium pipeline, and the other end of the heat recovery working medium heat storage tank is connected with heat recovery equipment (3); one end of the heat recovery working medium normal temperature tank (4) is connected with a reheater in the expansion generating set (9) through a heat working medium pipeline, and the other end of the heat recovery working medium normal temperature tank is connected with heat recovery equipment (3); the air liquefying system consists of a conventional air liquefying device (6); the air liquefying device (6) comprises a liquid air storage tank, one end of the air liquefying device (6) is connected with the heat recovery equipment (3), and the other end of the air liquefying device is connected with the pressurizing pump (7); the air expansion power generation system comprises a booster pump (7), a gasifier (8) and an expansion power generation unit (9); a gasifier (8) is arranged between the pressurizing pump (7) and the expansion generating set (9); the pressurized liquid propane cold accumulation system comprises a propane normal temperature tank (10) and a propane cryogenic tank (11); the propane normal temperature tank (10) is connected with the gasifier (8) through one end of a cold working medium pipeline, and the other end of the propane normal temperature tank is connected with the air liquefying device (6); the propane cryogenic tank (11) is connected with the gasifier (8) through one end of a cold working medium pipeline, and the other end of the propane cryogenic tank is connected with the air liquefying device (6).
2. A liquefied air energy storage system for storing cold using pressurized liquid propane as set forth in claim 1, wherein: the heat recovery working medium adopts pressurized water or normal pressure heat conduction oil.
3. A liquefied air energy storage system for storing cold using pressurized liquid propane as set forth in claim 1, wherein: the cold working medium adopts propane.
4. A liquefied air energy storage system for storing cold using pressurized liquid propane as set forth in claim 1, wherein: and a reheater is arranged in the expansion generating set (9), and a thermal working medium pipeline is arranged in the reheater.
5. A method for storing energy in liquefied air by using pressurized liquid propane for cold storage, comprising the steps of:
step 1: the air enters a compressor and a driving device (2) after being purified by a purifying device (1), and is pressurized to 3-6MPa;
step 2: the compressed air is subjected to heat exchange and cooling with a working medium from a heat recovery working medium normal temperature tank (4) through a heat recovery device (3), the working medium is stored in a heat recovery working medium heat storage tank (5) after being heated, and the heat storage working medium is normal pressure heat conduction oil or pressurized water, and the heat storage temperature is more than 240 ℃;
step 3: the cooled high-pressure air is further cooled and liquefied by an air liquefying device (6) and stored in a liquid air storage tank, so that the energy storage process is completed;
step 4: when releasing energy, the liquid air is sent into the gasifier (8) for gasification and heat absorption after the pressure of the liquid air is increased to 8-14MPa by the booster pump (7); meanwhile, the pressurized liquid propane at normal temperature in the propane normal temperature tank (10) is cooled to below-150 ℃ in the gasifier (8) in an exothermic manner, and is stored in the propane cryogenic tank (11), and the cryogenic propane is used for cooling air in the energy storage stage by the air liquefying device (6); the cold accumulation system is in a pressurized state when in operation, and the pressure is between 1MPa and 1.5 MPa;
step 5: the gasified air is subjected to power generation through an expansion power generation unit (9), reheaters are arranged among all stages of the expansion power generation unit (9), the heat recovery working medium in the heat recovery working medium heat storage tank (5) is utilized to heat the air to more than 200 ℃, so that the power generation efficiency is improved, the final exhaust temperature is 40-80 ℃, and the heat working medium returns to the heat recovery working medium normal temperature tank (4) after being cooled.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6920759B2 (en) * | 1996-12-24 | 2005-07-26 | Hitachi, Ltd. | Cold heat reused air liquefaction/vaporization and storage gas turbine electric power system |
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| CN108644607A (en) * | 2018-04-02 | 2018-10-12 | 全球能源互联网研究院有限公司 | A kind of cryogenic liquefying air energy storage systems and method |
| CN208123884U (en) * | 2018-04-02 | 2018-11-20 | 全球能源互联网研究院有限公司 | A kind of cryogenic liquefying air energy storage systems |
| CN210483984U (en) * | 2019-07-30 | 2020-05-08 | 上海锅炉厂有限公司 | Liquefied air energy storage system utilizing pressurized liquid propane to store cold |
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