CN221236750U - Air energy storage power station with sectional cooling - Google Patents
Air energy storage power station with sectional cooling Download PDFInfo
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- CN221236750U CN221236750U CN202323113090.9U CN202323113090U CN221236750U CN 221236750 U CN221236750 U CN 221236750U CN 202323113090 U CN202323113090 U CN 202323113090U CN 221236750 U CN221236750 U CN 221236750U
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- energy storage
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- 238000004146 energy storage Methods 0.000 title claims abstract description 64
- 238000001816 cooling Methods 0.000 title claims abstract description 32
- 238000010521 absorption reaction Methods 0.000 claims abstract description 86
- 238000005338 heat storage Methods 0.000 claims abstract description 26
- 239000006096 absorbing agent Substances 0.000 claims abstract description 18
- 239000012530 fluid Substances 0.000 claims description 58
- 238000004891 communication Methods 0.000 claims description 13
- 230000037361 pathway Effects 0.000 claims 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 38
- 238000001179 sorption measurement Methods 0.000 abstract description 19
- 239000000945 filler Substances 0.000 abstract description 13
- 238000001556 precipitation Methods 0.000 abstract 1
- 239000003570 air Substances 0.000 description 93
- 239000002808 molecular sieve Substances 0.000 description 10
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 238000003795 desorption Methods 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
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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
- Y02E60/14—Thermal energy storage
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- Other Air-Conditioning Systems (AREA)
Abstract
The utility model relates to the field of energy storage, and provides a sectional cooling air energy storage power station, which comprises: the heat storage system comprises an energy storage subsystem, a cold box and a heat storage subsystem, wherein the energy storage subsystem comprises an absorber, a plurality of compressors and a plurality of first heat exchangers, the compressors and the first heat exchangers are alternately arranged, the compressors are communicated with a heat release passage of the first heat exchangers, the first heat exchanger at the inlet end of the absorber comprises a first-stage heat exchanger and a second-stage heat exchanger, the heat release passage of the first-stage heat exchanger is sequentially communicated, the compressor is arranged at the inlet end of the heat release passage of the first-stage heat exchanger, and the absorber is arranged at the outlet end of the heat release passage of the second-stage heat exchanger; the heat storage subsystem comprises a first heat reservoir and a second heat reservoir, wherein the first heat reservoir is communicated with the inlet end of the heat absorption passage of the first heat exchanger, and the second heat reservoir is communicated with the outlet end of the heat absorption passage of the first heat exchanger. According to the sectional cooling air energy storage power station provided by the utility model, through two-stage cooling of air, the air temperature is reduced, water precipitation is promoted, and the consumption of adsorption filler in an adsorber is reduced.
Description
Technical Field
The utility model relates to the technical field of energy storage, in particular to a sectional cooling air energy storage power station.
Background
The liquid air energy storage is a clean, low-carbon, safe and long-life long-term energy storage technology, and can be used for compressing electric energy into high-pressure air through a compressor in a low electricity consumption period, cooling the air into liquid air after water exchange, and heating the water into high-temperature water to be stored in a storage tank when the high-pressure high-temperature air is cooled by water. In the electricity consumption peak period, liquid air is pressurized by a low-temperature centrifugal pump and is sent into a cold box, the liquid air in the cold box is then Wen Chenggao-gas-pressure gaseous air, and the gaseous air is heated by high-temperature hot water stored in the compression stage and then enters an expansion machine to be expanded for power generation. The air is heated by the high-temperature hot water and then cooled, the cooled hot water is changed into normal-temperature water after heat exchange by the air-cooled heat exchanger, and the normal-temperature water is stored for cooling the high-temperature compressed air.
In the air energy storage power station, the compressor compresses air and then discharges the air at high temperature, the high-temperature air is cooled to normal temperature, and the normal-temperature air enters the next stage of compressor for boosting or enters a cold box for liquefaction. Before the compressed air enters the cold box, the water, carbon dioxide and other hydrocarbon are required to be removed from the air entering the cold box, so that the air is prevented from being solidified in the low-temperature environment of the cold box to block the heat exchange channel of the cold box. The adsorbent packing in the adsorber is used as an effective device for adsorbing air moisture, carbon dioxide and other hydrocarbons, and has wide application in air separation plants. After the adsorber is adsorbed to a certain stage, desorption regeneration is required. In a conventional air separation device, dry high-temperature gas is adopted for desorption and regeneration, and the adsorption filler can be desorbed by introducing nitrogen into an adsorber after being electrically heated to about 170 ℃.
Under the high-temperature and high-humidity environment in summer, the temperature of cooling water introduced by a heat exchanger in the energy storage system is higher than that in other seasons, the temperature and the humidity of air entering the molecular sieve are higher, the moisture absorption load of the absorber can be increased, the material consumption of the adsorption filler is more, and the desorption power consumption of the adsorption filler is larger.
Disclosure of utility model
The utility model provides a sectional cooling air energy storage power station which is used for solving the defect of load of a molecular sieve of an absorber caused by the rise of the ambient temperature in the prior art.
The utility model provides a sectional cooling air energy storage power station, comprising:
The energy storage subsystem comprises an absorber, a plurality of compressors and a plurality of first heat exchangers, the compressors and the first heat exchangers are alternately arranged along an air flow path, the compressors are communicated with heat release passages of the first heat exchangers, the first heat exchangers positioned at the inlet ends of the absorbers comprise a first-stage heat exchanger and a second-stage heat exchanger, the heat release passages are sequentially communicated, the inlet ends of the heat release passages of the first-stage heat exchangers are arranged and communicated with the compressors, and the outlet ends of the heat release passages of the second-stage heat exchangers are arranged and communicated with the absorber;
the cooling box is communicated with the heat release passage of the first heat exchanger at the last stage;
The heat storage subsystem comprises a first heat reservoir and a second heat reservoir, the first heat reservoir is communicated with the inlet end of the heat absorption passage of the first heat exchanger, and the second heat reservoir is communicated with the outlet end of the heat absorption passage of the first heat exchanger.
The utility model provides a sectional cooling air energy storage power station, which further comprises an energy release subsystem, wherein the energy release subsystem is communicated with the cold box, the energy release subsystem comprises a plurality of second heat exchangers and a plurality of expanders which are alternately arranged in sequence, the outlet end of a heat absorption passage of each second heat exchanger is connected with the inlet end of each expander, and the heat absorption passages of the first heat reservoirs, the first heat exchangers, the second heat reservoirs and the heat release passage of each second heat exchanger are communicated to form a circulation loop.
According to the utility model, the first heat storage device comprises a first cooler and a first storage tank, wherein the first storage tank is arranged at and communicated with the outlet end of the first cooler so that fluid of the first cooler can be led into the first storage tank, and the first storage tank is communicated with the heat absorption passage of the second-stage heat exchanger so that fluid in the first storage tank can be led into the heat absorption passage of the second-stage heat exchanger.
According to the utility model, the inlet end of the first cooler is communicated with the heat release passage of the second heat exchanger, so that fluid in the heat release passage of the second heat exchanger is led into the first cooler.
According to the utility model, the first heat reservoir comprises a second storage tank, the inlet end of the second storage tank is communicated with the heat release passage of the second heat exchanger so that fluid in the heat release passage of the second heat exchanger flows into the second storage tank, and the outlet end of the second storage tank is communicated with the heat absorption passage of the first stage heat exchanger so that fluid in the second storage tank flows into the heat absorption passage of the first stage heat exchanger.
According to the utility model, the first heat storage device comprises a third storage tank and a second cooler connected to the outlet end of the third storage tank, the fluid of the third storage tank can be led into the second cooler, the outlet end of the third storage tank is communicated with the heat absorption passage of the first-stage heat exchanger, so that the fluid in the third storage tank can be led into the heat absorption passage of the first-stage heat exchanger, and the second cooler is connected between the third storage tank and the heat absorption passage of the second-stage heat exchanger, so that the fluid of the second cooler can be led into the heat absorption passage of the second-stage heat exchanger.
According to the utility model, the third storage tank is communicated with the heat release passage of the second heat exchanger, so that the fluid of the heat release passage of the second heat exchanger can be introduced into the third storage tank.
According to the air energy storage power station with the sectional cooling function, the inlet end of the heat absorption passage of the second-stage heat exchanger is communicated with the first heat reservoir, the outlet end of the heat absorption passage of the second-stage heat exchanger is communicated with the inlet end of the heat absorption passage of the first-stage heat exchanger, and the outlet end of the heat absorption passage of the first-stage heat exchanger is communicated with the second heat reservoir.
According to the utility model, the air energy storage power station with the sectional cooling is provided, and the end difference of the second-stage heat exchanger is less than or equal to 3 ℃.
According to the utility model, a sectional cooling air energy storage power station is provided, and the second-stage heat exchanger is a plate-fin heat exchanger.
According to the utility model, the air energy storage power station with segmented cooling is provided, the compressor comprises a low-pressure compressor, a medium-pressure compressor and a high-pressure compressor which are sequentially arranged, and the adsorber is positioned at the inlet end of the high-pressure compressor.
The first heat exchanger at the inlet end of the absorber comprises the first-stage heat exchanger and the second-stage heat exchanger, and the outlet end of the compressor, the heat release passage of the first-stage heat exchanger, the heat exchange passage of the second-stage heat radiator and the inlet end of the absorber are communicated, so that exhaust gas of the compressor is cooled by the first-stage heat exchanger and the second-stage heat exchanger through the two-stage coolers and then enters the absorber for adsorption, the two-stage cooling can reduce the water carried in the air, the consumption of adsorption filler in the absorber is further reduced, the energy consumed by desorption of the adsorption filler can be reduced, and the energy utilization rate is improved.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a segmented cooled air energy storage plant according to a first embodiment of the present utility model;
FIG. 2 is a schematic diagram of a segmented cooled air energy storage plant according to a second embodiment of the present utility model, differing from FIG. 1 in the configuration of the first heat reservoir;
FIG. 3 is a schematic diagram of a segmented cooled air energy storage plant according to a third embodiment of the present utility model;
Reference numerals:
1: a filter; 2. 4, 9: a compressor; 3. 25, 10: a first heat exchanger; 5: a first stage heat exchanger; 6: a second stage heat exchanger; 7: a gas-water separator; 8: an adsorber; 11: a second heat reservoir; 12. 14, 16, 18: an expander; 13. 15, 17, 19: second heat exchanger, 20: a first cooler; 21: a first storage tank; 22: a second storage tank; 23. a third tank; 24. and a second cooler.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The segmented cooled air energy storage power station of the present utility model is described below in connection with fig. 1, 2 and 3, comprising: the energy storage subsystem 100, the cold box, the heat storage subsystem and the energy release subsystem 200, wherein the energy storage subsystem 100 stores air in the cold box in a liquefied way, and the liquid air in the cold box can be converted into electric energy through the energy release subsystem 200. Wherein the energy storage subsystem 100 and the energy release subsystem 200 are alternately operated, one is operated, and the other is stopped. During operation of the energy storage subsystem 100, the heat storage subsystem collects heat from compressed air in the energy storage subsystem 100, and during operation of the energy release subsystem 200, the heat stored in the heat storage subsystem is used to warm the air in the energy release subsystem 200.
Before describing the sectional-cooling air energy storage power station of the present utility model, the following embodiments will describe a "heat absorption path" and a "heat release path", wherein the "heat absorption path" refers to the heat absorption of fluid in the path, the "heat release path" refers to the heat release of fluid in the path, and it can be understood that the fluid in the "heat absorption path" absorbs heat from the fluid in the "heat release path" and the fluid in the "heat release path" releases heat to the fluid in the "heat release path".
Based on the seasonal variation of the temperature of the air, in summer, the high humidity and high temperature of the air in the energy storage subsystem 100 can affect the separation of water, carbon dioxide and other hydrocarbons in the air, so that the required adsorption filler is increased, the power consumption required for desorption is increased, and the operation efficiency of the energy storage subsystem 100 can be affected.
The embodiment of the utility model provides a sectional-cooling air energy storage power station, wherein an energy storage subsystem comprises an absorber 8, a plurality of compressors 2, 4 and 9 and a plurality of first heat exchangers 3, 25 and 10, on an energy storage path of air, the compressors 2, 4 and 9 and the first heat exchangers 3, 25 and 10 are sequentially and alternately arranged, and the compressors 2, 4 and 9 are communicated with heat release paths of the first heat exchangers 3, 25 and 10 so as to enable the air to release heat and cool in the heat release paths of the first heat exchangers 3, 25 and 10, and heat storage fluid in the heat release paths of the first heat exchangers 3, 25 and 10 absorbs heat and heats. That is, the exhaust gas temperature of the compressors 2, 4, 9 is high (at 200 ℃ or higher), and the first heat exchangers 3, 25, 10 cool the exhaust gas of the compressors 2, 4, 9.
The adsorber 8 is positioned on the flow path of air, the first heat exchanger 25 positioned at the inlet end of the adsorber 8 comprises a first-stage heat exchanger 5 and a second-stage heat exchanger 6, the heat release paths of the first-stage heat exchanger 5 are sequentially communicated, the heat release paths of the second-stage heat exchanger 6 are communicated with the adsorber 8, and the heat release paths of the first-stage heat exchanger 5 are communicated with the upstream compressor 4; the cold box is communicated with the heat release passage of the first heat exchanger 10 of the last stage.
The first heat exchangers 3, 25, 10 may be understood as heat exchangers downstream of the compressors 2, 4, 9, the compressors 2, 4, 9 are upstream of the first heat exchangers 3, 25, 10, ambient air enters the compressor 2 first, after being heated and pressurized by the compressor 2, enters a heat release passage of the first heat exchanger 3, air is cooled in the heat release passage of the first heat exchanger 3, heat storage medium in a heat absorption passage of the first heat exchanger 3 absorbs heat and heats up, and the air sequentially enters the compressors 4, 9 and the first heat exchangers 25, 10 until the air is discharged into a cold box through the heat release passage of the first heat exchanger 10 of the last stage, so as to realize air energy storage.
The first heat exchanger 25 at the inlet end of the adsorber 8 comprises two stages of heat exchangers, that is, air enters the first stage heat exchanger 5 and the second stage heat exchanger 6 in sequence for cooling before entering the adsorber 8, and the temperature of the air outlet of the first heat exchanger 25 is reduced by two stages of cooling, that is, the inlet air temperature of the adsorber 8 is reduced, so that more water is separated out from the air, the design material of the adsorption packing in the adsorber 8 is reduced, and meanwhile, the required energy consumption is less when the adsorption packing is desorbed.
The adsorber 8 may be a molecular sieve adsorption tower, and the adsorption filler may include a filler having adsorption and desorption functions such as molecular sieve alumina and molecular sieve filler. Moisture, carbon dioxide, other hydrocarbons and the like in the air can be adsorbed by the alumina and the molecular sieve filler as the adsorption material.
In some cases, a gas-water separator 7 is disposed between the adsorber 8 and the heat release passage of the second stage heat exchanger 6, and moisture in the air is separated first and then enters the adsorber 8 to be adsorbed.
According to the sectional cooling air energy storage power station provided by the embodiment of the utility model, the cooling compressed air is exhausted to the first-stage heat exchanger 5 and the second-stage heat exchanger 6 by adopting a mode of cooling the air by two stages of heat exchangers, the first-stage heat exchanger 5 can be understood as a heat exchanger of a high-temperature section, the temperature of the air entering the first-stage heat exchanger 5 is higher and corresponds to the heat exchanger of the high-temperature section, the second-stage heat exchanger 6 can be understood as a heat exchanger of a low-temperature section, the air entering the second-stage heat exchanger 6 is cooled and cooled through the first-stage heat exchanger 5, and the temperature of the air is lower and corresponds to the heat exchanger of the low-temperature section.
The heat exchanger based on cooling high temperature air generally comprises a shell-and-tube heat exchanger, a plate heat exchanger and a plate fin heat exchanger, wherein the tube heat exchanger is suitable for high temperature and high pressure medium, the end difference between an inlet and an outlet of the cooling medium and the high temperature medium is generally 10 ℃, the temperature of the plate heat exchanger is generally not higher than 300 ℃ and the pressure of the plate heat exchanger is not higher than 3Mpa, the end difference can be generally 5 ℃, and the first-stage heat exchanger 5 can be a plate heat exchanger or a shell-and-tube heat exchanger. The temperature of the applicable medium of the plate-fin heat exchanger is not higher than 150 ℃, the end difference can reach 2 ℃ generally, and the second-stage heat exchanger 6 can be an efficient plate-fin heat exchanger.
In some cases, the end difference of the second-stage heat exchanger 6 is less than or equal to 3 ℃ so as to meet the cooling requirement of air.
In some embodiments, in an air energy storage power station, three-to-four stages of compression may be performed on air (three-to-four stages of compressors and three-to-four stage first heat exchangers are provided), the discharge temperature of each stage of compressors 2, 4, 9 typically exceeding 200 ℃, and the inlet temperature of each stage of compressors 2, 4, 9 between 35-38 ℃. The discharge pressure of the first and second stage compressors 2, 4 is less than 2Mpa.
Referring to fig. 1, the compressors 2, 4, 9 and the first heat exchangers 3, 25, 10 of the energy storage subsystem may be all configured in three groups, the compressors include a low-pressure compressor, a medium-pressure compressor and a high-pressure compressor which are sequentially configured, the first-stage compressor 2 is a low-pressure compressor, the second-stage compressor 4 is a medium-pressure compressor, the third-stage compressor 9 is a high-pressure compressor, and the first heat exchangers 3, 25, 10 are all configured between each-stage compressor 2, 4, 9.
The adsorber 8 is located at the inlet end of the high pressure compressor, the volume of air is small under high pressure, the tank body of the required adsorber 8 is small, and the greater cost can be saved, and the adsorber 8 is generally arranged at the high pressure section (the inlet end of the high pressure compressor 9) of the energy storage subsystem. In summer, in the months when the air humidity is high, condensed water is precipitated in the high-pressure air in a high-pressure state, and the lower the temperature at which the high-pressure air is cooled, the more water is precipitated in the air, and the less adsorption filler is required.
Among the low pressure compressor, the medium pressure compressor and the high pressure compressor, the low pressure, the medium pressure and the high pressure are relative concepts, the exhaust pressure of the low pressure compressor is smaller than that of the medium pressure compressor, the exhaust pressure of the medium pressure compressor is smaller than that of the high pressure compressor, and the exhaust pressure is gradually increased. That is, the first stage heat exchanger 5 is disposed at the outlet end of the medium pressure compressor.
Of course, the number of the first heat exchangers 3, 10 downstream of the other compressors 2, 9 is not limited, as the first heat exchangers 3, 10 may comprise one or more stages of heat exchangers.
In the above description, the first heat exchanger 25 at the inlet end of the adsorber 8 is configured to include the first-stage heat exchanger 5 and the second-stage heat exchanger 6, and the heat release paths of the first-stage heat exchanger 5 and the second-stage heat exchanger 6 are communicated and used for introducing air, and the heat absorption paths of the first-stage heat exchanger 5 and the second-stage heat exchanger 6 are introduced with heat storage fluid that needs to absorb heat and raise temperature, and the connection relationship between the heat absorption paths of the first-stage heat exchanger 5 and the second-stage heat exchanger 6 is described in connection with the heat storage subsystem and the energy release subsystem.
Regarding the above-mentioned heat storage subsystem, the heat storage subsystem comprises a first heat reservoir communicating with the inlet end of the heat absorption path of the first heat exchanger 3, 25, 10 and a second heat reservoir 11 communicating with the outlet end of the heat absorption path of the first heat exchanger 3, 25, 10. The first heat reservoir is also communicated with the heat exchange outlet end of the energy release subsystem, the second heat reservoir 11 is also communicated with the heat exchange inlet end of the energy release subsystem, namely, the heat absorption channels of the first heat reservoir, the first heat exchangers 3, 25 and 10 and the heat exchange channels of the second heat reservoir 11 and the energy release subsystem are communicated to form a circulation loop, a heat storage medium circularly flows in the circulation loop, and the heat storage medium can be water, brine mixture or the like.
Regarding the energy release subsystem, the energy release subsystem is communicated with the cold box, the energy release subsystem comprises a plurality of second heat exchangers 13, 15, 17 and 19 and a plurality of expanders 12, 14, 16 and 18 which are sequentially and alternately arranged, on the energy release path of the air, the heat absorption paths of the second heat exchangers 13, 15, 17 and 19 and the expanders 12, 14, 16 and 18 are sequentially and alternately arranged, the heat absorption paths of the second heat exchangers 13, 15, 17 and 19 are communicated with the expanders 12, 14, 16 and 18, and the heat absorption paths of the first heat exchangers 3, 25 and 10, the heat release paths of the second heat exchangers 11 and the second heat exchangers 13, 15, 17 and 19 are communicated to form a circulation loop.
Next, heat exchange patterns of the first stage heat exchanger 5 and the second stage heat exchanger 6 are provided.
In a first embodiment, referring to fig. 1, the first heat reservoir includes a first cooler 20 and a first storage tank 21, the first storage tank 21 is disposed at and communicates with an outlet end of the first cooler 20 such that fluid of the first cooler 20 is introduced into the first storage tank 21, and the first storage tank 21 communicates with a heat absorption passage of the second stage heat exchanger 6 such that fluid in the first storage tank 21 is introduced into the heat absorption passage of the second stage heat exchanger 6, so that the fluid absorbs heat in the second stage heat exchanger 6 to raise temperature.
The first heat reservoir is used for storing the fluid exiting the second heat exchanger 13, 15, 17, 19, based on the first heat reservoir being connected to the outlet end of the heat release path of the second heat exchanger 13, 15, 17, 19. The inlet end of the first cooler 20 communicates with the heat release passage of the second heat exchanger 13, 15, 17, 19 so that the fluid of the heat release passage of the second heat exchanger 13, 15, 17, 19 is led into the first cooler 20.
In the energy release stage, the fluid at the outlet ends of the second heat exchangers 13, 15, 17 and 19 firstly enters the first cooler 20 for cooling, and the cooled fluid is stored in the first storage tank 21; in the energy storage stage, the fluid in the first storage tank 21 is introduced into the heat absorption passage of the second-stage heat exchanger 6, the fluid in the heat absorption passage of the second-stage heat exchanger 6 is warmed by absorbing heat from the air in the heat release passage of the second-stage heat exchanger 6, and the fluid after the heat absorption and warming flows into the second heat reservoir 11 and is stored in the second heat reservoir 11.
Referring to fig. 1, the heat absorption channels of the other first heat exchangers 3, 10 are also in communication with the first storage tank 21, and absorb heat from the air of the energy storage subsystem by the fluid in the first storage tank 21.
The first reservoir 21 may be used to store water or other heat storage fluid. When heat is stored by water in the heat storage subsystem, cooling water is stored in the first storage tank 21.
In a first embodiment, the first heat reservoir comprises a second reservoir 22, the inlet end of the second reservoir 22 being in communication with the heat release passage of the second heat exchanger 13, 15, 17, 19 such that fluid of the heat release passage of the second heat exchanger 13, 15, 17, 19 flows into the second reservoir 22, and the outlet end of the second reservoir 22 is in communication with the heat absorption passage of the first stage heat exchanger 5 such that fluid in the second reservoir 22 is led into the heat absorption passage of the first stage heat exchanger 5. Based on the above, the fluid in the heat absorption channel of the second stage heat exchanger 6 is the fluid cooled by the first cooler 20, and the fluid in the heat absorption channel of the first stage heat exchanger 5 is the fluid before the cooling by the first cooler 20, that is, the fluid temperature at the inlet end of the heat absorption channel of the first stage heat exchanger 5 is higher than the fluid temperature at the inlet end of the heat absorption channel of the second stage heat exchanger 6, which helps to raise the temperature at the outlet end of the first stage heat exchanger 5 and ensure the temperature of the fluid entering the second heat reservoir 11.
In the second embodiment, unlike the first embodiment, referring to fig. 2, the first heat reservoir includes a third storage tank 23 and a second cooler 24 connected to an outlet end of the third storage tank 23, the fluid in the third storage tank 23 may flow into the second cooler 24, the outlet end of the third storage tank 23 is connected to the heat absorption path of the first stage heat exchanger 5, so that the fluid in the third storage tank 23 may flow into the heat absorption path of the first stage heat exchanger 5, the second cooler 24 is connected between the third storage tank 23 and the heat absorption path of the second stage heat exchanger 6, so that the fluid in the second cooler 24 may flow into the heat absorption path of the second stage heat exchanger 6, the temperature of the fluid flowing into the heat absorption path of the first stage heat exchanger 5 is increased, and the temperature of the fluid at the outlet end of the heat absorption path of the first stage heat exchanger 5 may be increased, so as to avoid affecting the energy storage effect of the second heat reservoir 11.
Wherein the third tank 23 communicates with the heat release passage of the second heat exchanger 13, 15, 17, 19 so that the fluid of the heat release passage of the second heat exchanger 13, 15, 17, 19 can be introduced into the third tank 23.
In the third embodiment, the difference from the first embodiment is that, referring to fig. 3, the inlet end of the heat absorption passage of the second stage heat exchanger 6 is connected to the first heat reservoir, the outlet end of the heat absorption passage of the second stage heat exchanger 6 is connected to the inlet end of the heat absorption passage of the first stage heat exchanger 5, the outlet end of the heat absorption passage of the first stage heat exchanger 5 is connected to the second heat reservoir 11, the fluid in the first heat reservoir is heated by the second stage heat exchanger 6 and the first stage heat exchanger 5 and then stored in the second heat reservoir 11, so that the outlet temperature of the heat absorption passage of the first stage heat exchanger 5 is raised, and the storage temperature of the fluid in the second heat reservoir 11 is ensured.
As shown in fig. 3, the first heat storage device includes a first cooler 20 and a first storage tank 21, the first storage tank 21 is disposed at and communicates with an outlet end of the first cooler 20, so that fluid of the first cooler 20 is led into the first storage tank 21, the first storage tank 21 communicates with a heat absorption path of the second stage heat exchanger 6, so that fluid in the first storage tank 21 is led into the heat absorption path of the second stage heat exchanger 6, the heat absorption path of the second stage heat exchanger 6 communicates with the heat absorption path of the first stage heat exchanger 5, the heat absorption path of the first stage heat exchanger 5 communicates with the second heat storage device 11, and fluid heated by the second stage heat exchanger 6 and the first stage heat exchanger 5 is stored in the second heat storage device 11.
The connection mode of the first-stage heat exchanger 5 and the second-stage heat exchanger 6 shown in fig. 3 can omit the second storage tank 22 in fig. 1, simplify the equipment structure and reduce the equipment cost. Of course, regardless of the structural form of the first heat reservoir (the embodiment of fig. 3 may also employ the structure of the first heat reservoir in fig. 1 or fig. 2), the outlet end of the heat absorption path of the second stage heat exchanger 6 may be connected to the inlet end of the heat absorption path of the first stage heat exchanger 5, so as to raise the outlet temperature of the first stage heat exchanger 5.
Based on the above, the energy storage subsystem operates, that is, the energy storage stage, the air filtered by the filter 1 is sucked and compressed by the compressor, the heated and pressurized air is obtained after compression, the air enters the heat release passage of the first heat exchanger for cooling and then enters the lower compressor, the compressors 2, 4 and 9 and the first heat exchangers 3, 25 and 10 are alternately arranged in turn, and the air with high pressure and normal temperature enters the cold box for liquefaction and storage after three-stage compression. The cold box is communicated with the heat release passage of the first heat exchanger 10 at the last stage, so that the air discharged by the energy storage subsystem enters the cold box. Through the energy storage phase, the water of the first heat reservoir in the heat storage subsystem, the high temperature hot water heated to 195 ℃ is stored in the second heat reservoir 11.
The energy release subsystem operates, namely in the power generation stage, after the liquefied air in the cold box is rewarmed by the cold box, the liquefied air enters the first-stage expander 12 after being heated by stored high-temperature hot water, the expansion is performed, the depressurization air at 70 ℃ is obtained after the work is performed, the depressurization air enters the next-stage expander 14 to do work after being heated by the high-temperature hot water in the second heat exchanger 13, the depressurization and cooling are analogized in sequence, and after the expansion of the last-stage expander 18, the air is subjected to normal pressure and is exhausted. Through the power generation stage, the 195 ℃ high-temperature hot water of the second heat reservoir 11 in the heat storage subsystem is cooled to 80 ℃ medium-temperature hot water, and is stored in the first heat reservoir.
In the energy storage stage and the power generation stage, the cold box and the heat storage subsystem are operated.
Next, referring to fig. 1, a specific example is provided in connection with the actual operation of the air energy storage power station with segmented cooling according to the embodiment of the present utility model.
In the energy storage stage, ambient air enters a low-pressure compressor to be heated and pressurized, the ambient air enters a medium-pressure compressor after being cooled by a first heat exchanger, the dry air discharged by the medium-pressure compressor is 200 ℃, the dry air is cooled to 90 ℃ by a first-stage heat exchanger 5, enters a second-stage heat exchanger 6 to be cooled to 35 ℃, and enters an absorber 8 after passing through a gas-water separator 7, wherein the first-stage heat exchanger 5 can be a plate heat exchanger, the second-stage heat exchanger 6 can be a plate-fin heat exchanger, and adsorption fillers in the absorber 8 can be molecular sieves. The other first heat exchangers 3, 10 may be plate heat exchangers, in which the air is cooled from 200 ℃ to 38 ℃. The cooling water of the first heat reservoir is at 33 ℃, the heat absorption passages of the other first heat exchangers 3 and 10 and the heat absorption passage of the second heat exchanger 6 are introduced, the heat absorption passage of the first heat exchanger 5 is introduced into the uncooled medium-temperature water in the second heat reservoir 11, and the medium-temperature water can be between 70 and 80 ℃.
In the energy release stage, the expansion machines 12, 14, 16 and 18 exhaust, the water temperature returned to the first heat reservoir by the second heat exchanger is 80 ℃, one strand of the water enters the second storage tank of the first heat reservoir, and the rest part of the water enters the first storage tank for storage after being cooled to 33 ℃ by the first cooler. The hot water of the second storage tank enters the heat absorption passage of the first-stage heat exchanger 5 to exchange heat, the cooling water of the first storage tank enters the heat absorption passage of the second-stage heat exchanger 6 to exchange heat, and the low-temperature cooling water in the first storage tank enters the other first heat exchangers 3 and 10 respectively.
After the first-stage heat exchanger 5 and the second-stage heat exchanger 6 are matched, the second-stage heat exchanger 6 can be a high-efficiency plate-fin heat exchanger, the exhaust temperature of the second-stage heat exchanger 6 is reduced compared with the exhaust temperature of the structure of the single-stage heat exchanger (the exhaust temperature is reduced to 35 ℃ from 38 ℃), the adsorption load of the molecular sieve adsorption material in the adsorber 8 can be reduced, and the consumption of the molecular sieve adsorption material is reduced by about 14 tons. Meanwhile, the water inlet temperature of the heat absorption passage of the first-stage heat exchanger 5 is increased, and the water discharge temperature of the heat absorption passage of the first-stage heat exchanger 5 and the water discharge temperature of the heat absorption passage of the second-stage heat exchanger 6 are matched, so that the water storage temperature of the second heat reservoir 11 is more stable.
According to the embodiment of the utility model, the heat of the system is reasonably distributed and comprehensively utilized, so that the electric energy consumption required by desorption of the molecular sieve is saved, the energy is saved, and the electric-electric conversion efficiency of electric energy storage and release of the energy storage power station is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A segmented cooled air energy storage power station comprising:
The energy storage subsystem comprises an absorber, a plurality of compressors and a plurality of first heat exchangers, the compressors and the first heat exchangers are alternately arranged along an air flow path, the compressors are communicated with heat release passages of the first heat exchangers, the first heat exchangers positioned at the inlet ends of the absorbers comprise a first-stage heat exchanger and a second-stage heat exchanger, the heat release passages are sequentially communicated, the inlet ends of the heat release passages of the first-stage heat exchangers are arranged and communicated with the compressors, and the outlet ends of the heat release passages of the second-stage heat exchangers are arranged and communicated with the absorber;
the cooling box is communicated with the heat release passage of the first heat exchanger at the last stage;
The heat storage subsystem comprises a first heat reservoir and a second heat reservoir, the first heat reservoir is communicated with the inlet end of the heat absorption passage of the first heat exchanger, and the second heat reservoir is communicated with the outlet end of the heat absorption passage of the first heat exchanger.
2. The segmented cooled air energy storage power station of claim 1, further comprising an energy release subsystem, the energy release subsystem being in communication with the cold box, the energy release subsystem comprising a plurality of second heat exchangers and a plurality of expanders arranged alternately in sequence, an outlet end of a heat absorption path of the second heat exchangers being connected to an inlet end of the expanders, and heat absorption paths of the first heat reservoirs, the first heat exchangers, the second heat reservoirs and a heat release path of the second heat exchangers being in communication to form a circulation loop.
3. The staged cooled air energy storage power station of claim 2, wherein the first heat reservoir comprises a first cooler and a first reservoir disposed at and in communication with an outlet end of the first cooler such that fluid from the first cooler passes into the first reservoir, the first reservoir in communication with a heat absorption pathway of the second stage heat exchanger such that fluid within the first reservoir passes into the heat absorption pathway of the second stage heat exchanger.
4. The staged cooled air energy storage power station of claim 3, wherein the inlet end of the first cooler communicates with the heat rejection path of the second heat exchanger such that fluid from the heat rejection path of the second heat exchanger passes into the first cooler.
5. The staged cooled air energy storage power station of claim 4, wherein the first heat reservoir comprises a second storage tank, an inlet end of the second storage tank being in communication with the heat rejection path of the second heat exchanger such that fluid from the heat rejection path of the second heat exchanger flows into the second storage tank, an outlet end of the second storage tank being in communication with the heat absorption path of the first stage heat exchanger such that fluid from the second storage tank passes into the heat absorption path of the first stage heat exchanger.
6. The segmented cooled air energy storage power station of claim 2, wherein the first heat reservoir comprises a third reservoir and a second cooler connected to an outlet end of the third reservoir, the third reservoir fluid being passable to the second cooler, the outlet end of the third reservoir being in communication with the heat absorption pathway of the first stage heat exchanger such that the fluid within the third reservoir is passable to the heat absorption pathway of the first stage heat exchanger, the second cooler being connected between the third reservoir and the heat absorption pathway of the second stage heat exchanger such that the second cooler fluid is passable to the heat absorption pathway of the second stage heat exchanger.
7. The staged cooled air energy storage power station of claim 6, wherein the third storage tank communicates with the heat rejection circuit of the second heat exchanger such that fluid of the heat rejection circuit of the second heat exchanger may pass into the third storage tank.
8. The segmented cooled air energy storage power station of claim 1, wherein an inlet end of the heat absorption passage of the second stage heat exchanger is in communication with the first heat reservoir, an outlet end of the heat absorption passage of the second stage heat exchanger is in communication with an inlet end of the heat absorption passage of the first stage heat exchanger, and an outlet end of the heat absorption passage of the first stage heat exchanger is in communication with the second heat reservoir.
9. The staged cooled air energy storage power plant according to any of claims 1 to 8, wherein the second stage heat exchanger has an end difference of 3 ℃ or less and/or the second stage heat exchanger is a plate fin heat exchanger.
10. The staged cooled air energy storage plant of any of claims 1 to 8, wherein the compressors comprise a low pressure compressor, a medium pressure compressor and a high pressure compressor arranged in sequence, the adsorber being located at an inlet end of the high pressure compressor.
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| CN202323113090.9U CN221236750U (en) | 2023-11-17 | 2023-11-17 | Air energy storage power station with sectional cooling |
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| CN202323113090.9U CN221236750U (en) | 2023-11-17 | 2023-11-17 | Air energy storage power station with sectional cooling |
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