CN117108368A - Double-stage compression expansion heat storage power generation system - Google Patents
Double-stage compression expansion heat storage power generation system Download PDFInfo
- Publication number
- CN117108368A CN117108368A CN202311199853.8A CN202311199853A CN117108368A CN 117108368 A CN117108368 A CN 117108368A CN 202311199853 A CN202311199853 A CN 202311199853A CN 117108368 A CN117108368 A CN 117108368A
- Authority
- CN
- China
- Prior art keywords
- heat storage
- heat
- temperature
- storage system
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005338 heat storage Methods 0.000 title claims abstract description 314
- 238000010248 power generation Methods 0.000 title claims abstract description 73
- 230000006835 compression Effects 0.000 title claims abstract description 18
- 238000007906 compression Methods 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 230000008859 change Effects 0.000 claims abstract description 40
- 239000012782 phase change material Substances 0.000 claims description 28
- 230000009977 dual effect Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 231100000956 nontoxicity Toxicity 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 29
- 230000009471 action Effects 0.000 description 12
- 238000004146 energy storage Methods 0.000 description 11
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910001868 water Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- AZFNGPAYDKGCRB-XCPIVNJJSA-M [(1s,2s)-2-amino-1,2-diphenylethyl]-(4-methylphenyl)sulfonylazanide;chlororuthenium(1+);1-methyl-4-propan-2-ylbenzene Chemical compound [Ru+]Cl.CC(C)C1=CC=C(C)C=C1.C1=CC(C)=CC=C1S(=O)(=O)[N-][C@@H](C=1C=CC=CC=1)[C@@H](N)C1=CC=CC=C1 AZFNGPAYDKGCRB-XCPIVNJJSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004304 potassium nitrite Substances 0.000 description 1
- 235000010289 potassium nitrite Nutrition 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- 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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
-
- 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
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The double-stage compression expansion heat storage power generation system comprises a low-temperature heat storage power generation device, a first countercurrent heat exchanger and a high-temperature heat storage power generation device, wherein the low-temperature heat storage power generation device comprises a liquid storage tank, a low-temperature phase change heat reservoir, a first compressor, a first expander, a first heat storage system, a liquid pump, a throttle valve, a first power generator, a first circulating medium and connecting pipelines between the first heat storage system and the liquid pump; the high-temperature heat storage power generation device comprises a low-temperature liquid reservoir, a high-temperature phase change heat reservoir, a second heat storage system, a second expander, a second compressor, a second generator, a second circulating medium and a connecting pipeline between the two; the low-temperature heat storage power generation device and the high-temperature heat storage power generation device are used for simultaneously carrying out heat storage and power generation modes. The invention adopts two low-high temperature heat storage power generation systems which are complemented by freon and water vapor, and has the characteristics of no toxicity, no harm, green and clean performance and high working efficiency.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a two-stage compression expansion heat storage power generation system.
Background
With the start of green energy to gradually replace global power supply, large-scale energy storage is required all over the world, and new technologies such as novel carbon dioxide energy storage, compressed air energy storage, hydrogen energy storage and the like are endlessly layered. The compressed air in the new technology energy storage has large energy storage capacity, the single machine capacity can reach more than hundred megawatts, and the energy storage is inferior to the pumped storage, but the compressed air stored energy can be heated to cause energy loss in the conversion process, the energy utilization efficiency is low, commercialization is not realized until now, and the limit of geographical conditions is large. Aiming at the technical and application bottleneck problems of the compressed air energy storage system, a carbon dioxide energy storage mode is provided, and compared with air, carbon dioxide has some unique advantages as a medium; but its cost is high, the main equipment is still in the research stage, and a lot of research and development is needed to make it more viable. The pain point of hydrogen energy storage is that many factors such as high hydrogen cost, high power station manufacturing cost, low energy conversion efficiency, low technical maturity and long whole flow of hydrogen production, hydrogen storage, hydrogen transportation and power generation bring great challenges to the application and popularization of hydrogen energy storage power generation.
The invention adopts a multistage form, utilizes low-boiling point organic medium at a low temperature section, adopts steam at a high temperature end, reduces system cost and improves power generation efficiency.
Disclosure of Invention
In order to find a heat storage power generation system with low cost and high efficiency, the invention provides a two-stage compression expansion heat storage power generation system, which utilizes a low-boiling point organic medium at a low-temperature section, adopts a low-temperature and high-temperature heat transfer medium represented by steam at a high-temperature end, and realizes reversible circulation of heat storage power generation by mutual complementation of two circulation mediums through a countercurrent heat exchanger, wherein the cost is lower, and the system is easy to commercialize, and is specifically described as follows:
a two-stage compression expansion heat storage power generation system comprises a low-temperature heat storage power generation device, a first countercurrent heat exchanger and a high-temperature heat storage power generation device;
the low-temperature heat storage power generation device comprises a liquid storage tank, a low-temperature phase change heat storage device, a first compressor, a first expander, a first heat storage system, a liquid pump, a throttle valve, a first generator, a first circulating medium and a connecting pipeline between the first compressor and the first expander; the low-temperature phase change heat reservoir is internally provided with a low-temperature phase change material, and a heat transfer pipeline is arranged around the low-temperature phase change material; the liquid storage tank is communicated with a heat transfer pipeline of the low-temperature phase change heat reservoir, and the first compressor and the first expander are connected in parallel between the heat transfer pipeline of the low-temperature phase change heat reservoir and a first circulating medium channel of the first countercurrent heat exchanger; the other end of the first circulating medium channel of the first countercurrent heat exchanger is communicated with a first heat storage system; the liquid pump and the throttle valve are connected in parallel between the first heat storage system and the liquid storage tank;
the high-temperature heat storage power generation device comprises a low-temperature liquid reservoir, a high-temperature phase change heat reservoir, a second heat storage system, a second expander, a second compressor, a second generator, a second circulating medium and a connecting pipeline between the two; the high-temperature phase change heat reservoir is internally provided with a high-temperature phase change material, and a heat transfer pipeline is arranged around the high-temperature phase change material; the low-temperature liquid reservoir is communicated with one end of a second circulating medium channel in the first countercurrent heat exchanger, the second compressor and the second expander are connected in parallel between the other end of the second circulating medium channel of the first countercurrent heat exchanger and the second heat storage system, the other end of the second heat storage system is communicated with one end of a heat transfer pipeline of the high-temperature phase-change heat reservoir, and the other end of the heat transfer pipeline of the high-temperature phase-change heat reservoir is communicated with the high-temperature liquid reservoir.
Further, the first heat storage system comprises a second countercurrent heat exchanger, a high-temperature heat reservoir of the first heat storage system, a low-temperature heat reservoir of the first heat storage system, a circulating pump of the first heat storage system, a four-way valve of the first heat storage system and a first heat storage medium; the high-temperature heat reservoir of the first heat storage system is directly communicated with one end of a first heat storage medium channel in the second countercurrent heat exchanger, and a four-way valve of the first heat storage system and a circulating pump of the first heat storage system are connected between the other end of the first heat storage medium channel in the second countercurrent heat exchanger and the low-temperature heat reservoir of the first heat storage system; one end of the first circulating medium channel in the second countercurrent heat exchanger is communicated with the first circulating medium channel in the first countercurrent heat exchanger, and the other end of the first circulating medium channel is respectively communicated with the liquid pump and the throttle valve.
Further, the second heat storage system comprises a low-temperature heat reservoir of the second heat storage system, a third countercurrent heat exchanger, a high-temperature heat reservoir of the second heat storage system, a circulating pump of the second heat storage system and a four-way valve of the second heat storage system; the high-temperature heat reservoir of the second heat storage system is directly communicated with one end of a second heat storage medium channel in the third countercurrent heat exchanger, and a four-way valve of the second heat storage system and a circulating pump of the second heat storage system are connected between the other end of the second heat storage medium channel in the third countercurrent heat exchanger and the low-temperature heat reservoir of the second heat storage system; one end of a second circulating medium channel in the third countercurrent heat exchanger is communicated with a heat transfer pipeline of the high-temperature phase change heat reservoir; the other end of the second circulating medium channel of the third countercurrent heat exchanger is respectively communicated with the second expander and the second compressor.
Further, the high-temperature heat storage power generation device also comprises a circulating pump and an electromagnetic valve; the circulating pump and the electromagnetic valve are connected in parallel between the high-temperature liquid reservoir and the high-temperature phase-change heat reservoir.
Further, the first expander is electrically connected with the first generator; the second expander is electrically connected to a second generator.
Further, the circulation temperature of the first circulation medium is smaller than the circulation temperature of the second circulation medium.
Compared with the existing heat storage power generation technology, the invention adopts a two-stage compression expansion heat storage power generation system, utilizes low-boiling point organic medium at a low temperature section, adopts low-temperature high-temperature heat transfer medium represented by steam at a high temperature end, and passes through a countercurrent heat exchanger between two stages, so that the two circulation mediums are mutually complemented, and meanwhile, the problem of negative pressure by only adopting steam as the heat transfer medium is solved, and the reversible circulation of heat storage power generation is realized; in addition, water and sulfur or nitrate can be selected respectively on the low-temperature phase change material and the high-temperature phase change material, so that the cost is slightly increased compared with that of a pure steam heat storage power generation system, but the working efficiency is increased more, and the method is extremely easy to commercialize.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first configuration of a dual stage compression expansion heat storage power generation system of the present invention.
Fig. 2 is a schematic diagram of the heat storage operation mode in fig. 1.
Fig. 3 is a schematic diagram of the power generation operation mode in fig. 1.
FIG. 4 is a schematic diagram of a second embodiment of the present invention with a dual stage compression expansion thermal storage power generation system.
In the figure: 1. a liquid storage tank; 2. a low temperature phase change heat reservoir; 31. a first expander; 32. a second expander; 41. a first compressor; 42. a second compressor; 5. A first counter-flow heat exchanger; 6. a second counter-flow heat exchanger; 7. a high temperature heat reservoir of the first heat storage system; 8. a low temperature heat reservoir of the first heat storage system; 9. a circulation pump of the first heat storage system; 10. a liquid pump; 11. a throttle valve; 121. a first generator; 122. a second generator; 13. a cryogenic reservoir; 14. a high temperature reservoir; 15. a high temperature phase change heat reservoir; 16. a low temperature heat reservoir of the second heat storage system; 17. a third counter-flow heat exchanger; 18. a high temperature heat reservoir of the second heat storage system; 19. a circulation pump of the second heat storage system; 201. a first one-way valve; 202. A second one-way valve; 203. a third one-way valve; 204. A fourth one-way valve; 205. a fifth check valve; 206. A sixth one-way valve; 211. a four-way valve of the first heat storage system; 212. a four-way valve of the second heat storage system; 213. a four-way valve of the third heat storage system; 22. a circulation pump; 23. an electromagnetic valve; 24. a fourth counter-flow heat exchanger; 25. a high temperature heat reservoir of the third heat storage system; 26. a low temperature heat reservoir of the third heat storage system; 27. and a circulating pump of the third heat storage system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below.
It will be apparent that the described embodiments are only some, but not all, embodiments of the invention.
All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims. In order that the embodiments may be more readily understood, various embodiments or methods of implementing the invention are provided below to illustrate the relevant devices, modules, functions of the invention.
Embodiment one
As shown in fig. 1, a two-stage compression expansion heat storage power generation system comprises a low-temperature heat storage power generation device, a first countercurrent heat exchanger 5 and a high-temperature heat storage power generation device;
the low-temperature heat storage power generation device comprises a liquid storage tank 1, a low-temperature phase change heat storage device 2, a first compressor 41, a first expander 31, a first heat storage system, a liquid pump 10, a throttle valve 11, a first generator 121, a first circulating medium and connecting pipelines between the first circulating medium and the first circulating medium; the low-temperature phase change heat reservoir 2 is internally provided with a low-temperature phase change material, and a heat transfer pipeline is arranged around the low-temperature phase change material; the liquid storage tank 1 is communicated with one end of a heat transfer pipeline of the low-temperature phase change heat reservoir 2, the other end of the heat transfer pipeline of the low-temperature phase change heat reservoir 2 is respectively communicated with a medium inlet of the first compressor 41 and a medium outlet of the first expander 31, and the medium inlet of the first expander 31 and the medium outlet of the first compressor 41 are both communicated with a first circulating medium channel in the first countercurrent heat exchanger 5; the first circulating medium channel in the first countercurrent heat exchanger 5 is communicated with a first heat storage system; the liquid pump 10 and the throttle valve 11 are connected in parallel between the first heat storage system and the liquid storage tank 1. The first expander 31 is electrically connected to the first generator 121.
The first heat storage system comprises a second countercurrent heat exchanger 6, a high-temperature heat reservoir 7 of the first heat storage system, a low-temperature heat reservoir 8 of the first heat storage system, a circulating pump 9 of the first heat storage system, a four-way valve 211 of the first heat storage system and a first heat storage medium; the high-temperature heat reservoir 7 of the first heat storage system is directly communicated with one end of a first heat storage medium channel in the second countercurrent heat exchanger 6, and a four-way valve 211 of the first heat storage system and a circulating pump 9 of the first heat storage system are connected between the other end of the first heat storage medium channel in the second countercurrent heat exchanger 6 and the low-temperature heat reservoir 8 of the first heat storage system; one end of the first circulating medium channel in the second countercurrent heat exchanger 6 is communicated with the first circulating medium channel in the first countercurrent heat exchanger 5, and the other end of the first circulating medium channel is respectively communicated with the liquid pump 10 and the throttle valve 11.
When the first heat storage system stores heat, under the action of the circulating pump 9 of the first heat storage system, the first heat storage medium in the low-temperature heat reservoir 8 of the first heat storage system enters the circulating pump 9 of the first heat storage system through the four-way valve 211 of the first heat storage system, and then is sent to the first heat storage medium channel of the second countercurrent heat exchanger 6 again through the four-way valve 211 of the first heat storage system, the first heat storage medium absorbs the heat of the first circulating medium of the other channel in the second countercurrent heat exchanger 6, the temperature of the first heat storage medium is increased, and the heated first heat storage medium is finally directly sent to the high-temperature heat reservoir 7 of the first heat storage system for storage.
When the first heat storage system releases heat, under the action of the circulating pump 9 of the first heat storage system, the first heat storage medium stored in the high-temperature heat reservoir 7 of the first heat storage system is sent into the first heat storage medium channel of the second countercurrent heat exchanger 6, the first heat storage medium exchanges heat with the first circulating medium of the other channel of the second countercurrent heat exchanger 6, the first heat storage medium releases heat, and the released first heat storage medium is stored in the low-temperature heat reservoir 8 of the first heat storage system through the four-way valve 211 of the first heat storage system and the circulating pump 9 of the first heat storage system respectively.
The high-temperature heat storage power generation device comprises a low-temperature liquid storage 13, a high-temperature liquid storage 14, a high-temperature phase change heat storage 15, a second heat storage system, a second expansion machine 32, a second compressor 42, a second generator 122, a second circulating medium and connecting pipelines between the two; the high-temperature phase-change heat reservoir 15 is internally provided with a high-temperature phase-change material, and a heat transfer pipeline is arranged around the high-temperature phase-change material; the low-temperature liquid reservoir 13 is communicated with one end of a second circulating medium channel in the first countercurrent heat exchanger 5, the other end of the second circulating medium channel in the first countercurrent heat exchanger 5 is respectively communicated with a medium inlet of the second compressor 42 and a medium outlet of the second expander 32, the medium inlet of the second expander 32 and the medium outlet of the second compressor 42 are communicated with one end of a second heat storage system, the other end of the second heat storage system is communicated with one end of a heat transfer pipeline of the high-temperature phase-change heat reservoir 15, and the other end of the heat transfer pipeline of the high-temperature phase-change heat reservoir 15 is communicated with the high-temperature liquid reservoir 14. The second expander 32 is electrically connected to a second generator 122.
Referring to fig. 2, the high-temperature heat storage power generation device further includes a circulating pump 22 and an electromagnetic valve 23; the circulating pump 22 and the electromagnetic valve 23 are connected in parallel between the high-temperature liquid reservoir 14 and the high-temperature phase-change heat reservoir 15.
The second heat storage system comprises a low-temperature heat reservoir 16 of the second heat storage system, a third countercurrent heat exchanger 17, a high-temperature heat reservoir 18 of the second heat storage system, a circulating pump 19 of the second heat storage system and a four-way valve 212 of the second heat storage system; the high-temperature heat reservoir 18 of the second heat storage system is directly communicated with one end of a second heat storage medium channel in the third countercurrent heat exchanger 17, and a four-way valve 212 of the second heat storage system and a circulating pump 19 of the second heat storage system are connected between the other end of the second heat storage medium channel in the third countercurrent heat exchanger 17 and the low-temperature heat reservoir 16 of the second heat storage system; one end of a second circulating medium channel in the third countercurrent heat exchanger 17 is communicated with a heat transfer pipeline of the high-temperature phase change heat reservoir 15; the other end of the second circulation medium passage in the third counter-flow heat exchanger 17 is communicated with the second expander 32 and the second compressor 42, respectively.
When the second heat storage system stores heat, under the action of the circulating pump 19 of the second heat storage system, the second heat storage medium in the low-temperature heat reservoir 16 of the second heat storage system enters the circulating pump 19 of the second heat storage system through the four-way valve 212 of the second heat storage system, and then is sent to the second heat storage medium channel of the third countercurrent heat exchanger 17 through the four-way valve 212 of the second heat storage system again, the second heat storage medium absorbs the heat of the second circulating medium in the other channel of the third countercurrent heat exchanger 17, the temperature of the second heat storage medium is increased, and the heated second heat storage medium is finally directly sent to the high-temperature heat reservoir 18 of the second heat storage system for storage.
When the second heat storage system releases heat, under the action of the circulating pump 19 of the second heat storage system, the high-temperature second heat storage medium stored in the high-temperature heat reservoir 18 of the second heat storage system is sent to the second heat storage medium channel of the third countercurrent heat exchanger 17, the second heat storage medium exchanges heat with the second circulating medium of the other channel of the third countercurrent heat exchanger 17, the second heat storage medium releases heat, and the released second heat storage medium enters the low-temperature heat reservoir 16 of the second heat storage system through the four-way valve 212 of the second heat storage system and the circulating pump 19 of the second heat storage system respectively.
The first check valve 201 is installed in the branch of the first expander 31, and the second check valve 202 is installed in the branch of the first compressor 41.
The liquid pump branch is provided with a third one-way valve 203; the throttle valve 11 branch is provided with a fourth one-way valve 204.
The above-mentioned second expander 32 branch is fitted with a fifth one-way valve 205, and the second compressor 42 branch is fitted with a sixth one-way valve 206.
The two-stage compression expansion heat storage power generation system has two working modes, namely a heat storage working mode and a power generation working mode.
The heat storage working mode is as follows: referring to fig. 2, the low-temperature heat storage power generation device and the high-temperature heat storage power generation device enter a heat storage working mode at the same time; the low-temperature heat storage power generation device is characterized in that under the action of a first compressor 41, a first circulating medium in a liquid storage tank 1 is sent into a heat transfer pipeline of a low-temperature phase change heat reservoir 2, the first circulating medium exchanges isothermal heat with a low-temperature phase change material in the low-temperature phase change heat reservoir 2, the first circulating medium absorbs heat in the low-temperature phase change material to be gaseous, a gaseous first circulating steam medium enters the first compressor 41 and is compressed into a high-temperature high-pressure overheated gaseous first circulating medium, the high-temperature high-pressure overheated gaseous first circulating medium enters a first circulating medium channel of a first countercurrent heat exchanger 5, meanwhile, a second circulating medium in a low-temperature liquid storage tank 13 in the high-temperature heat storage power generation device enters a second circulating medium channel of the first countercurrent heat exchanger 5 under the action of a second compressor 42 and exchanges heat reversely with the high-temperature high-pressure overheated gaseous first circulating medium in the first circulating medium channel of the first countercurrent heat exchanger 5, the first circulating medium releases heat, and the second circulating medium absorbs heat and is vaporized; the high-temperature high-pressure first circulating medium after heat release is sent to the first circulating medium channel of the second countercurrent heat exchanger 6, meanwhile, under the action of the circulating pump 9 of the first heat storage system, the first heat storage medium in the low-temperature heat reservoir 8 of the first heat storage system is sent to the first heat storage medium channel of the second countercurrent heat exchanger 6, so that the first circulating medium and the first heat storage medium exchange heat reversely in the second countercurrent heat exchanger 6, the first heat storage medium absorbs the heat of the first circulating medium of the other channel in the second countercurrent heat exchanger 6, the temperature of the first heat storage medium rises, the heated first heat storage medium is finally directly sent to the high-temperature heat reservoir 7 of the first heat storage system for storage, the first circulating medium releases heat, the first circulating medium after heat release becomes the low-temperature liquid first circulating medium through the throttle valve 11, and finally is sent to the liquid storage tank 1 for the next round of circulation; in the high-temperature heat storage power generation device, gaseous second circulating medium coming out of a second circulating medium channel of the first countercurrent heat exchanger 5 directly enters the first compressor 41, is compressed into high-temperature high-pressure overheated gaseous second circulating medium, enters the third countercurrent heat exchanger 17, meanwhile, under the action of a circulating pump 19 of the second heat storage system, second heat storage medium in a low-temperature heat reservoir 16 of the second heat storage system is sent into a second heat storage medium channel of the third countercurrent heat exchanger 17 through a four-way valve 212 of the second heat storage system and the circulating pump 19 of the second heat storage system, and the second circulating medium and the second heat storage medium perform countercurrent heat exchange in the third countercurrent heat exchanger 17, the second heat storage medium absorbs the heat of the second circulating medium, the temperature of the second heat storage medium rises, the warmed second heat storage medium is finally directly sent to the high-temperature heat storage 18 of the second heat storage system to be stored, the second circulating medium enters the heat transfer pipeline of the high-temperature phase change heat storage 15 after releasing part of the heat of the third countercurrent heat exchanger 17, isothermal heat exchange is carried out on the second circulating medium and the high-temperature phase change material in the high-temperature phase change heat storage 15, the high-temperature phase change material absorbs the heat of the second circulating medium to generate phase change, the heat of the second circulating medium is stored in the high-temperature phase change heat storage 15 in a latent heat form, and meanwhile, the second circulating medium is changed into a liquid state to be sent to the high-temperature heat storage 14 to be utilized when power generation is carried out, so that the heat storage working mode is completed.
The power generation working mode is as follows: referring to fig. 3, the low-temperature heat-storage power generation device and the high-temperature heat-storage power generation device enter a power generation working mode at the same time; the low-temperature heat storage power generation device pumps a low-temperature liquid first circulating medium in the liquid storage tank 1 through the liquid pump 10, the low-temperature liquid first circulating medium is pressurized and then is sent to a first circulating medium channel of the second countercurrent heat exchanger 6, meanwhile, a circulating pump 9 of the first heat storage system pumps a high-temperature first heat storage medium stored in a high-temperature heat reservoir 7 of the first heat storage system and is sent to a first heat storage medium channel of the second countercurrent heat exchanger 6, the first heat storage medium and the first circulating medium conduct countercurrent heat exchange, the first heat storage medium releases heat, the first circulating medium absorbs heat, the released first heat storage medium is respectively stored in the low-temperature heat reservoir 8 of the first heat storage system through a four-way valve 211 of the first heat storage system and a circulating pump 9 of the first heat storage system, the first circulating medium after the first heat absorption enters the first circulating medium channel of the first countercurrent heat exchanger 5, meanwhile, the second circulating medium after acting also enters the second circulating medium channel of the first countercurrent heat exchanger 5, the first circulating medium and the second circulating medium reversely flow in the first countercurrent heat exchanger 5, the first circulating medium absorbs heat of the second circulating medium and becomes high-temperature and high-pressure, the first circulating medium becomes high-temperature heat energy, the first heat energy is directly enters the first expansion machine 31, and the first expansion machine is driven to generate heat energy, and the first expansion machine is directly, and the expansion machine is driven, and the heat energy is finally is converted and the heat energy is output; the first circulating medium after acting is discharged through the first expander 31, enters the low-temperature phase-change heat reservoir 2 to exchange heat with the low-temperature phase-change material, the low-temperature phase-change material absorbs heat of the first circulating medium to generate phase change, the phase change is stored in the low-temperature phase-change heat reservoir 2 in a latent heat form, the first circulating medium is changed into a low-temperature liquid first circulating medium after releasing heat, and finally enters the liquid storage tank 1, so that the power generation process of the low-temperature heat storage power generation device is completed; in the high-temperature heat storage power generation device, under the action of the circulating pump 22, a high-temperature high-pressure liquid second circulating medium in the high-temperature liquid storage 14 directly enters a heat transfer pipeline of the high-temperature phase change heat storage 15, the heat of a high-temperature phase change material in the high-temperature phase change heat storage 15 is absorbed, the high-temperature high-pressure vapor second circulating medium is changed into a high-temperature high-pressure vapor second circulating medium, the high-temperature high-pressure vapor second circulating medium enters a second circulating medium channel in the third countercurrent heat exchanger 17, meanwhile, under the action of the circulating pump 19 of the second heat storage system, the high-temperature second heat storage medium stored in the high-temperature heat storage 18 of the second heat storage system is sent into a second heat storage medium channel of the third countercurrent heat exchanger 17, the second heat storage medium exchanges heat with the high-temperature second circulating medium, the second heat storage medium releases heat, the released second heat storage medium enters the low-temperature heat storage 16 of the second heat storage system through the four-way valve 212 of the second heat storage system and the circulating pump 19 of the second heat storage system respectively, the second circulating medium absorbs heat and then directly enters the second expansion machine 32 to work, the second expansion machine 32 converts mechanical energy into electric energy to drive power, and finally generates electric energy, and converts the electric energy into electric energy to realize power generation and power conversion; the second circulation medium after acting is discharged through the second expander 32 and enters the second circulation medium channel of the first countercurrent heat exchanger 5, the first circulation medium and the second circulation medium reversely flow in the first countercurrent heat exchanger 5, the second circulation medium is liquefied by heat release, and finally enters the low-temperature liquid storage 13, so that the power generation process of the high-temperature heat storage power generation device is completed once.
In the low-temperature heat storage power generation device, the first circulating medium is a low-temperature circulating medium, a low-boiling point organic medium can be selected, freon is used as the optimal choice of the first circulating medium, and the working temperature is within 110 ℃. The phase change material in the low-temperature phase change heat reservoir 2 is a low-temperature solid-liquid phase change material, low-cost water is used as the low-temperature solid-liquid phase change material to be optimally selected, and the phase low-temperature phase change material is subjected to isothermal heat release in a heat storage working mode, so that the phase low-temperature phase change material is changed from a liquid state to a solid state; in the power generation working mode, the low-temperature phase change material absorbs isothermal heat from solid state to liquid state. The first heat storage medium in the first heat storage system preferably selects liquid water as the heat storage medium.
In the high-temperature heat storage power generation device, the second circulating medium is a high-temperature circulating medium, steam is used as the optimal choice of the second circulating medium, and the circulating working temperature is between 110 ℃ and 300 ℃; the phase change material in the high-temperature phase change heat reservoir 15 is a high-temperature solid-liquid phase change material, nitrate is used as the optimal choice of the high-temperature solid-liquid phase change material, such as sodium nitrate, potassium nitrate, sodium nitrite, potassium nitrite or binary salts of nitrate, and the like, and the high-temperature phase change material absorbs isothermal heat when in a heat storage working mode, and is changed from solid state to liquid state; in the power generation working mode, the high-temperature phase change material releases heat isothermally, and the liquid state is changed into the solid state. And the second heat storage medium in the second heat storage system preferentially selects molten salt as the heat storage medium.
Second embodiment
Referring to fig. 4, compared with fig. 1 in the first embodiment, the low-temperature heat storage power generation device of the two-stage compression expansion heat storage power generation system of the present invention further includes a third heat storage system; the third heat storage system comprises a fourth countercurrent heat exchanger 24, a high-temperature heat reservoir 25 of the third heat storage system, a low-temperature heat reservoir 26 of the third heat storage system, a circulating pump 27 of the third heat storage system, a four-way valve 213 of the third heat storage system, a third heat storage medium and connecting pipelines between the third heat storage medium and the third heat storage medium; the high-temperature heat reservoir 25 of the third heat storage system is directly communicated with one end of a third heat storage medium channel in the fourth countercurrent heat exchanger 24, and a four-way valve 213 of the third heat storage system and a circulating pump 27 of the third heat storage system are connected between the other end of the fourth heat storage medium channel in the fourth countercurrent heat exchanger 24 and the low-temperature heat reservoir 26 of the third heat storage system; one end of the first circulating medium passage in the fourth counter flow heat exchanger 24 is communicated with the first circulating medium passage in the first counter flow heat exchanger 5, and the other end thereof is communicated with the outlet of the first compressor 41 and the inlet of the first expander 31, respectively.
When the third heat storage system stores heat, under the action of the circulating pump 27 of the third heat storage system, the third heat storage medium in the low-temperature heat reservoir 26 of the third heat storage system enters the circulating pump 27 of the third heat storage system through the four-way valve 213 of the third heat storage system, and then is sent to the third heat storage medium channel of the fourth counter-current heat exchanger 24 again through the four-way valve 214 of the third heat storage system, the third heat storage medium absorbs the heat of the overheat saturated first circulating medium of the other channel in the fourth counter-current heat exchanger 24, the temperature of the third heat storage medium rises, and the heated third heat storage medium is finally directly sent to the high-temperature heat reservoir 25 of the third heat storage system for storage.
When the third heat storage system releases heat, the third heat storage medium stored in the high temperature heat storage 25 of the third heat storage system is sent to the third heat storage medium channel of the fourth counter-flow heat exchanger 24 under the action of the circulating pump 27 of the third heat storage system, the third heat storage medium exchanges heat with the first circulating medium of high temperature and high pressure in the other channel of the fourth counter-flow heat exchanger 24, the third heat storage medium releases heat, and the third heat storage medium after releasing heat is stored in the low temperature heat storage 26 of the third heat storage system through the four-way valve 213 of the third heat storage system and the circulating pump 27 of the third heat storage system, respectively; at the same time, the high-temperature high-pressure first circulating medium coming out of the first circulating medium channel of the fourth countercurrent heat exchanger 24 absorbs the high-temperature high-pressure first circulating medium which is changed into overheated by the third heat storage medium and is sent into the first expander 31 to do work; the other components shown in fig. 4 are installed and operated in the same manner as in the first embodiment.
Claims (6)
1. The two-stage compression expansion heat storage power generation system is characterized by comprising a low-temperature heat storage power generation device, a first countercurrent heat exchanger and a high-temperature heat storage power generation device;
the low-temperature heat storage power generation device comprises a liquid storage tank, a low-temperature phase change heat storage device, a first compressor, a first expander, a first heat storage system, a liquid pump, a throttle valve, a first generator, a first circulating medium and a connecting pipeline between the first compressor and the first expander; the low-temperature phase change heat reservoir is internally provided with a low-temperature phase change material, and a heat transfer pipeline is arranged around the low-temperature phase change material; the liquid storage tank is communicated with a heat transfer pipeline of the low-temperature phase change heat reservoir, and the first compressor and the first expander are connected in parallel between the heat transfer pipeline of the low-temperature phase change heat reservoir and a first circulating medium channel of the first countercurrent heat exchanger; the other end of the first circulating medium channel of the first countercurrent heat exchanger is communicated with a first heat storage system; the liquid pump and the throttle valve are connected in parallel between the first heat storage system and the liquid storage tank;
the high-temperature heat storage power generation device comprises a low-temperature liquid reservoir, a high-temperature phase change heat reservoir, a second heat storage system, a second expander, a second compressor, a second generator, a second circulating medium and a connecting pipeline between the two; the high-temperature phase change heat reservoir is internally provided with a high-temperature phase change material, and a heat transfer pipeline is arranged around the high-temperature phase change material; the low-temperature liquid reservoir is communicated with one end of a second circulating medium channel in the first countercurrent heat exchanger, the second compressor and the second expander are connected in parallel between the other end of the second circulating medium channel of the first countercurrent heat exchanger and the second heat storage system, the other end of the second heat storage system is communicated with one end of a heat transfer pipeline of the high-temperature phase-change heat reservoir, and the other end of the heat transfer pipeline of the high-temperature phase-change heat reservoir is communicated with the high-temperature liquid reservoir.
2. The two-stage compression expansion heat storage power generation system according to claim 1, wherein the first heat storage system comprises a second countercurrent heat exchanger, a high temperature heat reservoir of the first heat storage system, a low temperature heat reservoir of the first heat storage system, a circulating pump of the first heat storage system, a four-way valve of the first heat storage system and a first heat storage medium; the high-temperature heat reservoir of the first heat storage system is directly communicated with one end of a first heat storage medium channel in the second countercurrent heat exchanger, and a four-way valve of the first heat storage system and a circulating pump of the first heat storage system are connected between the other end of the first heat storage medium channel in the second countercurrent heat exchanger and the low-temperature heat reservoir of the first heat storage system; one end of the first circulating medium channel in the second countercurrent heat exchanger is communicated with the first circulating medium channel in the first countercurrent heat exchanger, and the other end of the first circulating medium channel is respectively communicated with the liquid pump and the throttle valve.
3. The two-stage compression expansion heat storage power generation system according to claim 1, wherein the second heat storage system comprises a low-temperature heat reservoir of the second heat storage system, a third countercurrent heat exchanger, a high-temperature heat reservoir of the second heat storage system, a circulating pump of the second heat storage system and a four-way valve of the second heat storage system; the high-temperature heat reservoir of the second heat storage system is directly communicated with one end of a second heat storage medium channel in the third countercurrent heat exchanger, and a four-way valve of the second heat storage system and a circulating pump of the second heat storage system are connected between the other end of the second heat storage medium channel in the third countercurrent heat exchanger and the low-temperature heat reservoir of the second heat storage system; one end of a second circulating medium channel in the third countercurrent heat exchanger is communicated with a heat transfer pipeline of the high-temperature phase change heat reservoir; the other end of the second circulating medium channel of the third countercurrent heat exchanger is respectively communicated with the second expander and the second compressor.
4. The two-stage compression expansion heat storage power generation system according to claim 1, wherein the high-temperature heat storage power generation device further comprises a circulating pump and an electromagnetic valve; the circulating pump and the electromagnetic valve are connected in parallel between the high-temperature liquid reservoir and the high-temperature phase-change heat reservoir.
5. The dual stage compression expansion heat storage power generation system of claim 1 wherein said first expander is electrically connected to a first generator; the second expander is electrically connected to a second generator.
6. The dual stage compression expansion heat storage power generation system of claim 1 wherein the first circulating medium has a circulating temperature less than the circulating temperature of the second circulating medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311199853.8A CN117108368A (en) | 2023-09-15 | 2023-09-15 | Double-stage compression expansion heat storage power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311199853.8A CN117108368A (en) | 2023-09-15 | 2023-09-15 | Double-stage compression expansion heat storage power generation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117108368A true CN117108368A (en) | 2023-11-24 |
Family
ID=88803874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311199853.8A Pending CN117108368A (en) | 2023-09-15 | 2023-09-15 | Double-stage compression expansion heat storage power generation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117108368A (en) |
-
2023
- 2023-09-15 CN CN202311199853.8A patent/CN117108368A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108533476B (en) | Heat pump supercritical air energy storage system | |
| CN102758690B (en) | Efficient high-pressure liquid air energy storage/release system | |
| CN102758748B (en) | High-pressure liquid air energy storage/release system | |
| CN112325497A (en) | Liquefied carbon dioxide energy storage system and application thereof | |
| CN114198170B (en) | Carbon dioxide energy storage system based on double heat storage loops and working method thereof | |
| CN112554984B (en) | Constant-pressure water-pumping compressed air energy storage system with heat storage function and operation method | |
| CN105179033A (en) | System for storing electric energy by means of low-temperature cold energy and operating method of system | |
| CN105736056B (en) | Liquid air energy storage system | |
| CN202811079U (en) | High-efficiency and high-pressure liquid air energy storage/ release system | |
| CN202811238U (en) | High-pressure liquid-state air energy storage/release system | |
| CN106677988B (en) | Wind-solar energy storage system | |
| CN220849779U (en) | Double-stage compression expansion heat storage power generation system | |
| CN115111804B (en) | Combined cooling heating and power system | |
| CN117108368A (en) | Double-stage compression expansion heat storage power generation system | |
| CN213540514U (en) | Liquid air energy storage system with self-absorption of compression heat | |
| CN111219216B (en) | Heat pump energy storage system and method capable of utilizing external heat source and cold source | |
| CN114484933A (en) | Carbon dioxide transcritical electricity storage coupling solar heat storage and carbon dioxide storage circulating system device and system method | |
| CN115930475A (en) | Heat pump energy storage system of combined heat and power supply | |
| CN112112694A (en) | Liquid air energy storage system and method for self-absorption of compression heat | |
| CN220567210U (en) | Steam medium phase-change heat storage power generation system | |
| CN220979587U (en) | Gas heat supplementing and heat storing power generation system | |
| CN112343677A (en) | Energy storage system based on high-low temperature heat storage and reverse organic Rankine cycle electricity storage | |
| CN221423275U (en) | Photo-thermal heat supplementing and storing power generation system | |
| CN220487684U (en) | Steam medium frequency conversion heat storage power generation system | |
| CN220857691U (en) | Thermal battery system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |