CN114934869A - Low-speed isothermal compression combined energy storage system and method - Google Patents
Low-speed isothermal compression combined energy storage system and method Download PDFInfo
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- CN114934869A CN114934869A CN202210552094.8A CN202210552094A CN114934869A CN 114934869 A CN114934869 A CN 114934869A CN 202210552094 A CN202210552094 A CN 202210552094A CN 114934869 A CN114934869 A CN 114934869A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/02—Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/42—Storage of energy
- F05B2260/422—Storage of energy in the form of potential energy, e.g. pressurized or pumped fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a low-speed isothermal compression combined energy storage system and a method, wherein the system comprises a high-pressure storage tank group, a high-pressure water pump, a hydroelectric generator and a water tank; the high-pressure storage tank group comprises a plurality of high-pressure storage tanks connected in parallel, high-pressure air and high-pressure water are filled in the tanks of the high-pressure storage tanks to serve as working media, and inner heat dissipation fins and outer heat dissipation fins which are in heat conduction communication are arranged inside and outside the tanks of the high-pressure storage tanks respectively; the outlet of the water tank is connected with a water injection port at the bottom of the high-pressure storage tank group through a high-pressure water pump; the inlet of the water tank is connected with the bottom water outlet of the high-pressure storage tank group through the hydroelectric generator. The isothermal expansion device has the advantages that the heat exchange structure with the environment is strengthened through the inner heat dissipation fins and the outer heat dissipation fins which are communicated in a heat conduction mode, water is pressurized through the high-pressure pump, isothermal compression is achieved by slowly compressing air through lifting of the water level in the high-pressure storage tank with the fixed volume, the hydraulic prime motor is driven to drive the generator to complete energy storage and release through storing a large amount of high-pressure water and slowly releasing the high-pressure water, and isothermal expansion is achieved.
Description
Technical Field
The invention relates to a compressed air energy storage system and a method, in particular to a low-speed isothermal compression combined energy storage system and a method.
Background
Pumped storage is an energy storage system which is earlier utilized and adopted by human beings, has the characteristics of simple system and high efficiency, but needs to utilize the preconditions of natural topography or established hydropower stations and the like. Compressed air energy storage is a type of energy storage mode with good development prospect at present, especially, a mode of storing gas by using a high-pressure gas tank is adopted, the limitation of utilizing the geographic conditions of natural rock caverns or mine caverns and the like is avoided, the compressed air energy storage has wider application prospect, but most systems are in an adiabatic or partial adiabatic compression process, heat exchange and heat storage equipment needs to be configured to improve the system efficiency, and a technical scheme of a near-isothermal process is adopted, the compressed air energy storage is realized by methods of water spraying or foam and the like, so that the whole system is relatively complex, and a large amount of cooling circulation media are needed. Although the two energy storage systems are both put into use by mature industrial systems, the defects of the two energy storage systems still exist, natural rock caverns or mine caverns need to be subjected to leakage prevention treatment and are far away from the electricity utilization demand ends, the energy supply setting is greatly limited by the energy storage region and demand conditions, the existing high-pressure gas storage tank is subjected to the influences of equipment complexity and operation maintenance, and the large-scale application is limited to a certain extent.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-speed isothermal compression combined energy storage system and method, which are reasonable in design, simple in structure, small in heat loss and extremely high in conversion efficiency due to isothermal compression and expansion.
The invention is realized by the following technical scheme:
a low-speed isothermal compression combined energy storage system comprises a high-pressure storage tank group, a high-pressure water pump, a hydroelectric generator and a water tank;
the high-pressure storage tank group comprises a plurality of high-pressure storage tanks connected in parallel, high-pressure air and high-pressure water are filled in the high-pressure storage tanks to serve as working media, and inner heat dissipation fins and outer heat dissipation fins which are in heat conduction communication are arranged inside and outside the high-pressure storage tanks respectively;
the outlet of the water tank is connected with a water injection port at the bottom of the high-pressure storage tank group through a high-pressure water pump;
the inlet of the water tank is connected with a water outlet at the bottom of the high-pressure storage tank group through a hydroelectric generator.
Optionally, the inner heat dissipation fins are arranged at the top end inside the high-pressure storage tank, and the outer heat dissipation fins are arranged at the top end and the upper half part inside the high-pressure storage tank.
Optionally, the system further comprises a storage tank factory building, wherein the top of the storage tank factory building is provided with an exhaust fan, and the lower part of the storage tank factory building is provided with an air inlet; the high-pressure storage tank group is arranged in the storage tank plant.
Optionally, a water injection valve is arranged between the high-pressure water pump and a water injection port at the bottom of the high-pressure storage tank group; and a drain valve is arranged at a drain outlet at the bottom of the hydroelectric generator and the high-pressure storage tank group.
Optionally, the water injection port and the water discharge port at the bottom of the high-pressure storage tank group are shared and are respectively connected with the outlet of the high-pressure water pump and the inlet of the hydroelectric generator through a tee.
A low-speed isothermal compression combined energy storage method is based on the system in any one of the above items, and comprises,
low-speed isothermal compression energy storage, namely pressurizing water in a water tank by a high-pressure water pump, injecting the water into a high-pressure storage tank according to injection flow, allowing the high-pressure water to enter a high-pressure storage tank group, increasing the liquid level, rapidly exchanging heat between the tank body and the external environment through inner heat dissipation fins and outer heat dissipation fins which are in heat conduction communication, compressing air through an approximate isothermal process, and stopping the high-pressure water pump when the air is compressed to a rated working pressure to finish the low-speed isothermal compression energy storage; the ratio of the injection flow to the maximum design capacity of the high-pressure storage tank group is less than 5;
the high-pressure water in the high-pressure storage tank group is continuously discharged according to the discharge flow through the expansion of compressed air, and the pressure energy of the high-pressure water is utilized to push a hydroelectric generator to work to output mechanical energy or drive the generator to output electric energy; the compressed air absorbs heat from the environment through the inner radiating fins and the outer radiating fins which are in heat conduction communication in the expansion work applying process until water in the high-pressure storage tank group is completely discharged, the lowest working pressure of the system is reached, and low-speed isothermal compression energy release is completed;
the discharge flow rate of the low-speed isothermal compression energy release is equal to the injection flow rate of the low-speed isothermal compression energy storage.
Optionally, an initialization step is further included,
filling the water tank with pure water not lower than the maximum design capacity of the high-pressure storage tank group;
and (4) filling air with certain pressure into the high-pressure storage tank group to serve as the lowest working pressure of the system.
Optionally, when the ratio of the injection flow to the maximum design capacity of the high-pressure storage tank set is not less than 5, starting the exhaust fan, and keeping the near-isothermal compression and expansion process through forced ventilation.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, the heat exchange structure with the environment is strengthened through the inner heat dissipation fins and the outer heat dissipation fins which are in heat conduction communication, water is pressurized by the high-pressure pump, isothermal compression is realized by slowly compressing air through the lifting of the water level in the high-pressure storage tank with a fixed volume, energy is jointly stored through water pressure and compressed high-pressure gas, and a hydraulic prime motor is driven to complete energy storage and release through storing a large amount of high-pressure water and slowly releasing the high-pressure water, so that the whole compression and expansion are carried out under the isothermal condition, the heat loss in the isothermal compression and expansion process is ensured to be extremely small, additional spraying, heat exchange and heat storage equipment is not needed, the flexible and convenient construction can be carried out, the system principle is simple, the operation is stable, reliable and controllable, and the energy storage and release conversion efficiency is very high.
Furthermore, the inner heat radiating fins which are communicated in a heat conduction mode are arranged at the top, and the outer heat radiating fins are arranged at the top and the upper portion, so that the inner heat radiating fins are arranged corresponding to the storage space of the air in the high-pressure storage tank, the heat conduction of the inner heat radiating fins to the air is concentrated, the heat conduction of the environment is guaranteed by the large-range fins on the outer portion, the heat exchange between the air in the high-pressure storage tank and the external environment is achieved, and the isothermal process is better guaranteed.
Furthermore, the storage tank factory building ensures that the rapid charging and the rapid discharging are carried out again under the conditions of ensuring the safety of equipment and facilitating the maintenance, and can forcibly promote the heat exchange under special conditions to ensure the isothermal process.
Drawings
FIG. 1 is a schematic diagram of the system in an embodiment of the present invention.
In the figure: 1 is a high-pressure storage tank group, 2 is a high-pressure water pump, 3 is a hydroelectric generator, 4 is a water tank, 5 is a water injection valve, 6 is a drain valve, 7 is a pipeline, 8 is a storage tank factory building, 9 is an exhaust fan, 9 is an air inlet, 10 is an air inlet, 11 is an outer radiating fin, and 12 is an inner radiating fin.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention discloses a low-speed isothermal compression combined energy storage system, which comprises a high-pressure storage tank group 1, a high-pressure water pump 2, a hydroelectric generator 3, a water tank 4, a water injection valve 5, a water discharge valve 6, a pipeline 7 and a storage tank factory building 8 as shown in figure 1, wherein the storage tank factory building is provided with an exhaust fan 9 and an air inlet 10. The high-pressure storage tank is characterized in that a tank body of the high-pressure storage tank is provided with outer radiating fins 11 and inner radiating fins 12, a water tank 4 is connected with an inlet of a high-pressure water pump 2, an outlet of the high-pressure water pump 2 is connected with a water injection valve 5, the other end of the water injection valve 5 is connected with the bottom of a high-pressure storage tank set 1, one end of a drain valve 6 is connected with the bottom of the high-pressure storage tank set 1, the other end of the drain valve is connected with an inlet of a hydroelectric generator 3, an outlet of the hydroelectric generator 3 is connected with the water tank 4, and all devices are communicated through a pipeline 7.
The high-pressure storage tank group 1 is composed of a plurality of parallel-connected fixed-volume tank bodies capable of bearing pressure, high-pressure storage of large capacity can be achieved, the tank bodies are made of materials which are preferably made of metal according to designed working pressure, and the tank bodies can be made of steel, aluminum, glass fiber reinforced plastic or other materials. The tank may contain both water and air. The tank body is provided with outer radiating fins 11 and inner radiating fins 12 for strengthening heat exchange between the inside and the outside, so that the substances in the tank body can exchange heat with the environment quickly and keep a relatively close temperature. The inner radiating fins 12 are arranged at the top end inside the high-pressure storage tank, the outer radiating fins 11 are arranged at the top end and the upper half part inside the high-pressure storage tank, and the arrangement area of the outer radiating fins is more than that of the inner radiating fins 12. When the tank body of the high-pressure storage tank is made of metal, the outer radiating fins 11 and the inner radiating fins 12 are directly connected with the tank body; when the tank body of the high-pressure storage tank is made of a non-metal material, the outer radiating fins 11 and the inner radiating fins 12 are in heat conduction communication through a metal supporting layer arranged in the tank body of the high-pressure storage tank, and the heat exchange effect is guaranteed.
The high-pressure water pump 2 is driven by electric energy or mechanical energy, water in the water tank 4 is pressurized and then injected from the bottom of the high-pressure storage tank group 1, and the high-pressure water pump stops when the interface of the water and the air is isolated and the air in the tank is compressed to reach the rated working pressure. The ratio of the injection flow to the maximum design capacity of the high-pressure storage tank group 1 is less than 5; that is, the ratio of the total volume flow (liter/hr) of the high-pressure water entering the high-pressure storage tank group 1 to the maximum designed water volume (liter) of the high-pressure storage tank group 1 is small enough, preferably lower than 5, which means that the energy storage system needs at least 5 hours to store water, and the balance between the air temperature and the ambient temperature is realized by the slow compression process at a low speed to realize the compression process approaching isothermal.
The water tank 4 is a water storage tank body with normal pressure, and the volume of the water storage tank body needs to be slightly larger than the maximum design capacity of the high-pressure storage tank set 1 so as to provide enough water consumption.
The hydroelectric generator 3 is a device for efficiently converting the pressure energy of high-pressure water into mechanical energy, and realizes the output of mechanical work or electric work by continuously applying work through the high-pressure water when the system releases energy, the flow of water outlet is also controlled in the energy release process, the water outlet quantity is consistent with the water injection quantity, air is slowly expanded at a low speed, and an approximate isothermal process is realized.
The water injection valve 5 and the drain valve 6 play roles in turning off and conducting water flow when the system performs energy storage and energy release operation processes. The pipeline 7 is a pipeline connected among all the devices of the system.
The storage tank factory building 8 is the building that holds high-pressure storage tank group 1, and its effect is for providing basic sheltering from and the protection for high-pressure storage tank, and storage tank factory building 8 has the exhaust fan 9 at top and the air intake 10 of lower part simultaneously, carries out natural draft or forced draft for high-pressure storage tank, improves energy storage system's efficiency and energy storage, the energy release rate of energy storage system when improving special demand. For example, when a fast charge and discharge is required for peak shaving.
The system adopts a near-isothermal process of energy storage and release processes, which is realized by utilizing a reinforced heat exchange structure of a tank body and a ventilation structure of a factory building to release and absorb heat to the environment through a low-speed and slow compression and expansion process. It may have a plurality of high pressure storage tank sets 1, a plurality of high pressure water pumps 2 and a plurality of hydroelectric generators 3 to increase the scale of the system or to achieve a flexible mode of operation. The working medium is not limited to water and air, but other liquid and gaseous medium combinations, such as oil and nitrogen, can be used.
When the system works, the high-pressure storage tank group 1 of the high-efficiency heat exchange low-speed isothermal compressed air energy storage system has relatively large volume to accommodate a large amount of high-pressure water and compressed air so as to realize slow compression of the air (the whole compression process is more than 5 hours), and the energy storage capacity of the system is determined by the volume of the high-pressure storage tank group 1. The high-pressure storage tank group 1 has strong heat conduction capability with the outer heat radiating fins 11 and the inner heat radiating fins 12 for heat exchange enhancement, so that the materials in the tank can exchange heat with the environment quickly.
The high-pressure storage tank group 1 can simultaneously contain water and air, the high-pressure water and the air are jointly used as energy storage media, the water needs to be filled into or discharged from the high-pressure storage tank group 1 during system operation, the air is always reserved in the high-pressure storage tank group 1, and the water does not need to be supplemented under normal working conditions.
The invention utilizes high-pressure water and compressed air to store and release electric energy or mechanical energy together, and utilizes water to slowly store energy and air to expand isothermally to push the high-pressure water to release energy under a high-efficiency heat exchange structure; specifically, through utilizing to the environment high-efficient heat release and heat absorption for the high pressure water slowly compresses air in the jar body and realizes the isothermal compression process, convert electric energy or mechanical energy into the pressure energy of water and air, and utilize the air inflation process volume increase to promote high pressure water drive hydroelectric generator and release the process of pressure energy for electric energy or mechanical energy, realized system energy storage and energy release process, thereby on the basis of having combined the advantage of two kinds of energy storage methods now, and improve the process of air compression, formed a simple, efficient and united energy storage system.
The invention relates to an operation method of a low-speed isothermal compression combined energy storage system, which comprises the following steps of:
before the system works, the water tank 4 is filled with water or pure water which is not lower than the maximum design capacity of the high-pressure storage tank group 1 and is strictly filtered, the water injection valve 5 and the drain valve 6 are closed, air with certain pressure is filled in the high-pressure storage tank group 1 to serve as the lowest pressure of the system work and serve as the initial pressure, and the system can be set according to equipment and requirements, so that the working requirements of the equipment are met.
During low-speed isothermal compression energy storage, water injection valve 5 is open mode, and drain valve 6 closes, and high pressure water pump 2 injects high-pressure storage tank 1 into after with the water pressurization in water tank 4, and along with high pressure water gets into high-pressure storage tank group 1, the liquid level slowly risees, because the jar body can heat transfer fast with external environment, the air is compressed through approximate isothermal process. When the air is compressed to the rated working pressure of the system, the water injection valve 5 is closed, the high-pressure water pump 2 is stopped to finish the low-speed isothermal compression energy storage process;
when the low-speed isothermal compression energy release is carried out, the drain valve 6 is opened, high-pressure water in the high-pressure storage tank set 1 is discharged, the hydraulic generator 3 is pushed to work by utilizing the pressure energy of the high-pressure water, mechanical energy is output or the generator is driven to output electric energy, the high-pressure water in the high-pressure storage tank set 1 is continuously discharged and does work through expansion of compressed air, the air absorbs heat from the environment through a high-efficiency heat exchange structure in the expansion process until the water in the high-pressure storage tank set 1 is completely discharged, the low-speed isothermal compression energy release process is completed, and at the moment, the air in the high-pressure storage tank set 1 is not reduced and still maintains the lowest working pressure of the system.
In the operation process of the system, when the deviation between the temperature in the high-pressure storage tank and the ambient temperature is large or emergency rapid energy storage and release are needed, the exhaust fan 9 can be started, the near-isothermal compression and expansion process is kept through forced ventilation, and the efficiency of the system is improved.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A low-speed isothermal compression combined energy storage system is characterized by comprising a high-pressure storage tank group (1), a high-pressure water pump (2), a hydroelectric generator (3) and a water tank (4);
the high-pressure storage tank group (1) comprises a plurality of high-pressure storage tanks connected in parallel, high-pressure air and high-pressure water are filled in the high-pressure storage tanks to serve as working media, and inner heat dissipation fins (12) and outer heat dissipation fins (11) which are in heat conduction communication are arranged inside and outside the high-pressure storage tanks respectively;
the outlet of the water tank (4) is connected with a water injection port at the bottom of the high-pressure storage tank group (1) through a high-pressure water pump (2);
the inlet of the water tank (4) is connected with the bottom water outlet of the high-pressure storage tank group (1) through the hydroelectric generator (3).
2. A low speed isothermal compression combined energy storage system according to claim 1, characterized in that said inner fins (12) are arranged at the top end inside the high pressure tank, and said outer fins (11) are arranged at the top end and upper half inside the high pressure tank.
3. The low-speed isothermal compression combined energy storage system according to claim 1, further comprising a storage tank factory building (8), wherein the top of the storage tank factory building (8) is provided with an exhaust fan (8), and the lower part of the storage tank factory building (8) is provided with an air inlet (10); the high-pressure storage tank group (1) is arranged in a storage tank factory building (8).
4. The low-speed isothermal compression combined energy storage system according to claim 1, wherein a water injection valve (5) is arranged between the high-pressure water pump (2) and a water injection port at the bottom of the high-pressure storage tank group (1); and drain valves (5) are arranged at the bottom water outlets of the hydroelectric generator (3) and the high-pressure storage tank group (1).
5. The low-speed isothermal compression combined energy storage system according to claim 1 or 4, characterized in that a water injection port and a water discharge port at the bottom of the high-pressure storage tank group (1) are shared and are respectively connected with the outlet of the high-pressure water pump (2) and the inlet of the hydroelectric generator (3) through a tee joint.
6. A low-speed isothermal compression combined energy storage method is characterized in that the system based on any one of claims 1-5 comprises,
low-speed isothermal compression energy storage, water in a water tank (4) is pressurized through a high-pressure water pump (2) and then is injected into a high-pressure storage tank (1) according to the injection flow, the water enters the high-pressure storage tank set (1) along with high-pressure water, the liquid level rises, the tank body and the external environment perform rapid heat exchange through an inner heat dissipation fin (12) and an outer heat dissipation fin (11) which are in heat conduction communication, air is compressed through an approximate isothermal process, and when the air is compressed to a rated working pressure, the high-pressure water pump (2) is stopped to finish the low-speed isothermal compression energy storage; the ratio of the injection flow to the maximum design capacity of the high-pressure storage tank group (1) is less than 5;
the low-speed isothermal compression energy release is realized, high-pressure water in the high-pressure storage tank group (1) is continuously discharged according to the discharge flow through the expansion of compressed air, and the pressure energy of the high-pressure water is utilized to push a hydroelectric generator (3) to work to output mechanical energy or drive the generator to output electric energy; the compressed air absorbs heat from the environment through the inner radiating fins (12) and the outer radiating fins (11) which are communicated in a heat conduction way in the expansion work applying process until the water in the high-pressure storage tank set (1) is completely discharged, the lowest working pressure of the system is reached, and the low-speed isothermal compression energy release is completed;
the discharge flow rate during the low-speed isothermal compression energy release is equal to the injection flow rate of the low-speed isothermal compression energy storage.
7. The low-speed isothermal compression combined energy storage method according to claim 6, further comprising the following initialization steps,
filling the water tank (4) with pure water not lower than the maximum design capacity of the high-pressure storage tank group (1);
air with certain pressure is filled in the high-pressure storage tank group (1) to serve as the lowest working pressure of the system.
8. A low-speed isothermal compression combined energy storage method according to claim 6, characterized in that when the ratio of the injection flow rate to the maximum design capacity of the high-pressure storage tank group (1) is not less than 5, the exhaust fan (9) is started to maintain the near isothermal compression and expansion process by forced ventilation.
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| CN110259625A (en) * | 2019-05-31 | 2019-09-20 | 西安交通大学 | A kind of draw water compressed air energy-storage system and method using underground reservoir |
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- 2022-05-20 CN CN202210552094.8A patent/CN114934869A/en active Pending
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| CN108425784A (en) * | 2018-03-26 | 2018-08-21 | 华南理工大学 | A kind of water pumping compressed air energy-storage and its operation method |
| CN108571415A (en) * | 2018-04-03 | 2018-09-25 | 西安交通大学 | A kind of high pressure thermal insulation gas storage water pumping compressed air energy-storage |
| CN108930627A (en) * | 2018-07-06 | 2018-12-04 | 西安交通大学 | A kind of level pressure is drawn water compressed gas energy-storage system and energy storage method |
| CN110259625A (en) * | 2019-05-31 | 2019-09-20 | 西安交通大学 | A kind of draw water compressed air energy-storage system and method using underground reservoir |
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