CN116647053A - Constant-pressure energy storage system - Google Patents
Constant-pressure energy storage system Download PDFInfo
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- CN116647053A CN116647053A CN202310600525.8A CN202310600525A CN116647053A CN 116647053 A CN116647053 A CN 116647053A CN 202310600525 A CN202310600525 A CN 202310600525A CN 116647053 A CN116647053 A CN 116647053A
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- gas storage
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- 238000004146 energy storage Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 89
- 238000007789 sealing Methods 0.000 claims abstract description 45
- 238000010248 power generation Methods 0.000 claims abstract description 22
- 230000006835 compression Effects 0.000 claims abstract description 16
- 238000007906 compression Methods 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 5
- 238000013461 design Methods 0.000 claims description 12
- 238000009933 burial Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 125000004122 cyclic group Chemical group 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000012983 electrochemical energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/006—Systems for storing electric energy in the form of pneumatic energy, e.g. compressed air energy storage [CAES]
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/003—Systems for storing electric energy in the form of hydraulic energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The application discloses a constant-pressure type energy storage system, belongs to the technical field of energy storage and power generation, and can solve the problems that the internal pressure of an existing energy storage power station gas storage is not constant, repeated cyclic loading is not beneficial to keeping stable operation of air compression equipment, power generation equipment and the gas storage, the safety performance is poor, and effective overhaul working conditions cannot be provided. The system comprises: the gas storage is internally provided with a sealing piston which divides the inner cavity of the gas storage into a first cavity and a second cavity, and the sealing piston can move in the inner cavity of the gas storage; the storage reservoir is arranged on the upper side of the air storage and is communicated with the first chamber through a communication water pipe; the air compression equipment and the power generation equipment are arranged on the upper side of the air storage and are communicated with the second cavity through the air transmission pipeline; the air compression device is used for providing compressed air for the second chamber, and the power generation device is used for generating power by using the compressed air output by the second chamber. The application is used for the energy storage power station.
Description
Technical Field
The application relates to a constant-pressure energy storage system, and belongs to the technical field of energy storage and power generation.
Background
The technology of electrochemical energy storage and compressed air energy storage is the most mature in the novel energy storage, but the electrochemical energy storage has the defects of high manufacturing cost, short service life, high potential safety hazard and the like. Compared with the prior art, the compressed air energy storage has the advantages of high safety, large energy storage scale, long discharge time, long service life, wide comprehensive utilization range of heat, cold and electricity and the like.
The gas storage is used as one of key parts of a compressed air energy storage power station, and currently, the gas storage mainly comprises a variable pressure type gas storage and a constant pressure type gas storage. The internal pressure of the variable-pressure gas storage is not constant, repeated cyclic loading is performed, and stable operation of air compression equipment, power generation equipment and the gas storage is not facilitated; at present, the technology of a compressed air energy storage power station for providing constant pressure for a gas storage by using water head pressure cannot effectively isolate pressure water from the gas storage, has potential safety hazards, and cannot provide effective overhaul working conditions.
Disclosure of Invention
The application provides a constant-pressure energy storage system, which can solve the problems that the internal pressure of an existing compressed air energy storage power station gas storage warehouse is not constant, repeated cyclic loading is not beneficial to keeping the stable operation of air compression equipment, power generation equipment and the gas storage warehouse, the safety performance is poor and the effective overhaul working condition cannot be provided.
The application provides a constant voltage energy storage system, comprising:
the gas storage device comprises a gas storage, wherein a sealing piston is arranged in the gas storage, the sealing piston divides an inner cavity of the gas storage into a first cavity and a second cavity, and the sealing piston can move in the inner cavity of the gas storage;
the storage reservoir is arranged on the upper side of the air storage and is communicated with the first chamber through a communication water pipe;
the air compression equipment and the power generation equipment are arranged on the upper side of the air storage and are communicated with the second chamber through an air pipeline; the air compression device is used for providing compressed air for the second chamber, and the power generation device is used for generating power by using the compressed air output by the second chamber.
Optionally, a sealing layer is arranged on the inner wall of the gas storage, and the sealing piston is in sealing connection with the sealing layer.
Optionally, the gas storage is a horizontal tunnel with a circular section.
Optionally, the diameter of the communicating water pipe is less than or equal to half of the diameter of the gas storage.
Optionally, the top elevation of the communicating water pipe is determined according to the design normal water storage level of the water storage reservoir and the limit water level difference of the water storage reservoir.
Optionally, the limit water level difference of the gas storage is determined according to the volume of the communicating water pipe, the volume of the gas storage, the water surface area of the normal water storage level and the water surface area when the water storage level is the top of the communicating water pipe.
Optionally, the burial depth of the gas storage is determined according to the top elevation of the communicating water pipe and the design pressure value in the gas storage.
Optionally, the burial depth of the gas storage is the difference between the top elevation of the communicating water pipe and the set water head difference;
the set water head difference is the ratio of the designed pressure value in the gas storage and the volume weight of water.
Optionally, the sealing piston and the sealing layer are both made of rubber materials.
Optionally, the top elevation of the communicating water pipe can be calculated by a first formula;
the first formula is:
wherein H is L The height (m) of the top of the communicating water pipe; h s Designing a normal water storage level (m) for the water storage reservoir; r is the radius (m) of the communicated water pipe; l (L) L The length (m) of the communicating water pipe; r is the radius (m) of the gas storage; l (L) C Is the gas storage length (m); a is that L1 Is the water surface area of the normal water storage level (square meter); a is that L2 The water storage level is the water surface area (square meter) when the water storage level is communicated with the top of the vessel.
The application has the beneficial effects that:
according to the constant-pressure energy storage system provided by the application, the water head difference between the gas storage and the reservoir is controlled according to the air pressure required by design, so that the constant-pressure state in the gas storage can be effectively provided; and the sealing piston can effectively isolate pressure supply measurement and gas storage measurement, thereby providing an efficient operation mode. Compared with the existing variable-pressure type gas storage, the constant-pressure type gas storage of the compressed air energy storage power station does not need repeated cyclic loading in the operation life cycle except the overhaul working condition, and the constant-pressure state is kept in the gas storage all the time, so that the stability of chamber stress and air compression equipment and power generation equipment is facilitated, and the manufacturing cost is greatly reduced; the constant-pressure energy storage system can provide effective overhaul working conditions, and can greatly improve the working efficiency of the gas storage, the communicated water pipe and the gas transmission pipeline; in addition, the constant-pressure energy storage system can be built together with a pumped storage power station, a hydropower station or a reservoir, so that the manufacturing cost is further reduced.
Drawings
FIG. 1 is a schematic diagram of a constant voltage energy storage system according to an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of a gas reservoir according to an embodiment of the present application;
FIG. 3 is a schematic cross-sectional view of a gas storage according to an embodiment of the present application.
List of parts and reference numerals:
11. a gas storage; 12. a sealing piston; 13. a reservoir; 14. a communicating water pipe; 15. an air compression device; 16. a power generation device; 17. a gas line; 18. and (3) a sealing layer.
Detailed Description
The present application is described in detail below with reference to examples, but the present application is not limited to these examples.
An embodiment of the present application provides a constant voltage energy storage system, as shown in fig. 1, the system includes:
the gas storage 11 is provided with a sealing piston 12 therein, the sealing piston 12 divides the inner cavity of the gas storage 11 into a first cavity and a second cavity, and the sealing piston 12 is movable in the inner cavity of the gas storage 11.
The reservoir 13 is arranged on the upper side of the gas storage 11 and is communicated with the first chamber through a communicating water pipe 14.
The air compression equipment 15 and the power generation equipment 16 are arranged on the upper side of the air storage 11 and are communicated with the second chamber through the air pipeline 17; the air pressure device 15 is used for supplying compressed air to the second chamber, and the power generation device 16 is used for generating power by using the compressed air output by the second chamber.
Referring to fig. 1, one side of the gas storage 11 is connected with the water storage reservoir 13 through a small-diameter water communication pipe 14, and the other side of the gas storage 11 is connected with the air compression device 15 and the power generation device 16 through a gas transmission pipeline 17. The elevation of the reservoir 13 is greater than the elevation of the reservoir 11. Specifically, the diameter of the communicating water pipe 14 may be set to be less than or equal to half the diameter of the gas storage 11.
In practical application, the gas storage 11 is a horizontal tunnel with a circular cross section, and a sealing piston 12 is arranged in the horizontal tunnel.
When peak regulation and energy storage are carried out, the air compression device 15 is controlled to compress air into a second cavity of the air storage 11 through the air transmission pipeline 17, and the air storage 11 stores air and energy through the constant-pressure pushing sealing piston 12; when generating electricity, the air valve in the power generation equipment 16 is controlled, the air storage 11 pushes the sealing piston 12 through constant water pressure in the first chamber, and constant pressure air in the air storage 11 is discharged to the power generation equipment 16 for generating electricity.
Referring to fig. 2 and 3, a sealing layer 18 is provided on an inner wall of the gas storage 11, and the sealing piston 12 is hermetically connected to the sealing layer 18.
The surface of the sealing layer 18 of the gas storage 11 should have certain smoothness so as to meet the smoothness of the sealing piston 12 in the process of energy storage and power generation; the sealing layer 18 sealing the piston 12 and the gas reservoir 11 should have a certain compressive strength and sealing properties, and the connection with the gas reservoir 11 should also have sealing properties. The sealing piston 12 and the sealing layer 18 of the gas storage 11 have strength required to meet the load design requirements of the gas storage 11.
The types of materials of the seal piston 12 and the seal layer 18 are not limited to deformation-resistant, wear-resistant, and high-temperature-resistant materials such as polymer materials. In practice, rubber materials may be used for the sealing piston 12 and the sealing layer 18.
In the embodiment of the application, the height of the top of the communicating water pipe 14, the burial depth of the gas storage 11, the pressure value in the gas storage 11 and the specific section size and length of the gas storage 11 can be determined through design calculation; specifically, the height of the top of the water communication pipe 14 is determined according to the design normal water level of the water storage reservoir 13 and the limit water level difference of the water storage reservoir 11. The limit water level difference of the air storage 11 is determined according to the volume of the communicating water pipe 14, the volume of the air storage 11, the water surface area of the normal water storage level and the water surface area when the water storage level is the top of the communicating water pipe 14.
Specifically, the top elevation of the communicating pipe 14 can be calculated by a first formula;
the first formula is:
wherein H is L A top elevation (m) for communicating with the water pipe 14; h s Designing a normal water level (m) for the water reservoir 13; r is the radius (m) of the communicating tube 14; l (L) L A length (m) of the communicating water pipe 14; r is the radius (m) of the gas storage 11; l (L) C Length (m) of the gas storage 11; a is that L1 Is the water surface area of the normal water storage level (square meter); a is that L2 The water storage level is the water surface area (square meter) when the water storage level is communicated with the top of the vessel.
The burial depth of the gas storage 11 can be determined according to the top elevation of the communicating water pipe 14 and the design pressure value in the gas storage 11.
Specifically, the burial depth of the air reservoir 11 can be calculated by the second formula.
The second formula is:
wherein: h C An axis elevation (m) of the air reservoir 11; h L A top elevation (m) for communicating with the water pipe 14; p is a design pressure value (kPa) in the gas storage 11; gamma ray w Is the volume weight of water (kN/m) 3 )。
The design pressure value in the gas storage 11 and the specific size of the gas storage 11 can be determined according to the power generation requirement.
When the gas storage 11 needs to be overhauled, the water level of the gas storage 13 is reduced below the pipe orifice at the top of the communicating water pipe 14, then the communicating water pipe 14 and the water at the water side of the sealing piston 12 in the gas storage 11 are discharged, meanwhile, the pressure at the two sides of the sealing piston 12 in the gas storage 11 is kept equal and moved to a proper position by controlling the power generation equipment 16 and the air compression equipment 15, and the corresponding overhauling can be carried out when the pressure at the two sides of the sealing piston 12 is reduced to the atmospheric pressure.
According to the constant-pressure energy storage system provided by the application, the water head difference between the gas storage 11 and the reservoir is controlled according to the air pressure required by design, so that the constant-pressure state in the gas storage 11 can be effectively provided; and the sealing piston 12 can effectively isolate the pressure supply measurement and the gas storage measurement, thereby providing an efficient operation mode. Compared with the existing variable-pressure type gas storage, the constant-pressure type gas storage 11 of the compressed air energy storage power station does not need repeated cyclic loading in the operation life cycle except the overhaul working condition, and the constant-pressure state is kept in the gas storage 11 all the time, so that the stability of the chamber stress and the air compression equipment 15 and the power generation equipment 16 is facilitated, and the manufacturing cost is greatly reduced; the constant-pressure energy storage system can provide effective overhaul working conditions, and can greatly improve the working efficiency of the gas storage 11, the communicating water pipe 14 and the gas transmission pipeline 17; in addition, the constant-pressure energy storage system can be built together with a pumped storage power station, a hydropower station or a reservoir, so that the manufacturing cost is further reduced.
While the application has been described in terms of preferred embodiments, it will be understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the application, and it is intended that the application is not limited to the specific embodiments disclosed.
Claims (9)
1. A constant voltage energy storage system, the system comprising:
the gas storage device comprises a gas storage, wherein a sealing piston is arranged in the gas storage, the sealing piston divides an inner cavity of the gas storage into a first cavity and a second cavity, and the sealing piston can move in the inner cavity of the gas storage;
the storage reservoir is arranged on the upper side of the air storage and is communicated with the first chamber through a communication water pipe;
the air compression equipment and the power generation equipment are arranged on the upper side of the air storage and are communicated with the second chamber through an air pipeline; the air compression device is used for providing compressed air for the second chamber, and the power generation device is used for generating power by using the compressed air output by the second chamber.
2. The constant pressure energy storage system as claimed in claim 1, wherein a sealing layer is provided on an inner wall of the gas storage, and the sealing piston is hermetically connected with the sealing layer.
3. The constant pressure energy storage system of claim 1, wherein said gas reservoir is a circular cross-section horizontal tunnel.
4. The constant pressure energy storage system of claim 1, wherein the diameter of the communicating water pipe is less than or equal to half the diameter of the gas reservoir.
5. The constant pressure energy storage system of claim 1, wherein the elevation of the top of the communicating water pipe is determined based on the reservoir design normal water level and the reservoir limit water head.
6. The constant pressure energy storage system of claim 5, wherein the reservoir limit water head is determined based on the connected water pipe volume, reservoir volume, normal water level water surface area, and water surface area when the water level is the top of the connected water pipe.
7. A constant pressure energy storage system as claimed in any one of claims 1 to 6 wherein the depth of burial of said reservoir is determined in dependence upon the elevation of the top of said communicating water pipe and the design pressure value within said reservoir.
8. The constant pressure energy storage system of claim 7, wherein the depth of burial of the reservoir is the difference between the elevation of the top of the communicating water pipe and a set head difference;
the set water head difference is the ratio of the designed pressure value in the gas storage and the volume weight of water.
9. The constant pressure energy storage system of claim 2, wherein said sealing piston and said sealing layer are both rubber materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310600525.8A CN116647053A (en) | 2023-05-25 | 2023-05-25 | Constant-pressure energy storage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310600525.8A CN116647053A (en) | 2023-05-25 | 2023-05-25 | Constant-pressure energy storage system |
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| CN116647053A true CN116647053A (en) | 2023-08-25 |
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| CN202310600525.8A Pending CN116647053A (en) | 2023-05-25 | 2023-05-25 | Constant-pressure energy storage system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117569273A (en) * | 2024-01-15 | 2024-02-20 | 中国电建集团西北勘测设计研究院有限公司 | Air compression energy storage and water pumping energy storage combined energy storage device |
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2023
- 2023-05-25 CN CN202310600525.8A patent/CN116647053A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117569273A (en) * | 2024-01-15 | 2024-02-20 | 中国电建集团西北勘测设计研究院有限公司 | Air compression energy storage and water pumping energy storage combined energy storage device |
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