CN114183681B - Gas storage system and method - Google Patents

Gas storage system and method Download PDF

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Publication number
CN114183681B
CN114183681B CN202111517519.3A CN202111517519A CN114183681B CN 114183681 B CN114183681 B CN 114183681B CN 202111517519 A CN202111517519 A CN 202111517519A CN 114183681 B CN114183681 B CN 114183681B
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medium
air
gas
storage
assembly
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CN114183681A (en
Inventor
张学锋
郑开云
池捷成
舒梦影
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Xeca Shanghai Energy Technology Co ltd
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Xeca Shanghai Energy Technology Co ltd
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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
    • 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
    • F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
    • 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
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • 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
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • 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
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses a gas storage system and a method, wherein the gas storage system comprises a gas storage and a gas bag, the gas bag is arranged in the gas storage, the gas bag is suitable for storing compressed air, the gas bag has a first working condition and a second working condition, the gas bag is inflated to store the compressed air in the first working condition, the gas bag is contracted to discharge the compressed air in the second working condition, or the gas bag is suitable for storing the compressed air between the gas bag and the gas storage, the gas bag has a third working condition and a fourth working condition, the gas bag is contracted to store the compressed air in the third working condition, and the gas bag is inflated to discharge the compressed air in the fourth working condition. The gas storage system has the advantages of high utilization rate of the gas storage volume, constant-pressure operation, low cost and the like.

Description

Gas storage system and method
Technical Field
The invention relates to the field of compressed air energy storage, in particular to a gas storage system and a method.
Background
The compressed air energy storage technology is an electric power energy storage system capable of realizing high-capacity and long-time electric energy storage, and the redundant electric power is stored in a mode that the first compressor compresses normal-pressure air to high pressure and stores the air, so that the high-pressure air is released and expanded to do work to generate electricity when electricity is needed. An oversized-volume air reservoir is required to be configured in the compressed air energy storage device to store compressed air
In the related art, the utilization rate of the gas storage is low, and the investment cost is high.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
in the related art, the air storage adopts a variable pressure operation mode with a fixed volume, the air pressure at the bottom of the air storage is 7MPa, when the energy is stored, the air is filled into the air storage until the pressure reaches 10MPa, and when the energy is released, the air is discharged from the air storage until the pressure returns to 7 MPa. That is, only 30% of the total gas amount after the gas storage is filled is used for power generation, and the utilization rate of the gas storage volume is low. In addition, because the investment of the gas storage is large, particularly the cost of the ground pipeline gas storage is high, the effective utilization of the volume of the gas storage has a great influence on the economical efficiency of the energy storage power station. On the other hand, in the pressure-variable operation mode of the gas storage, the compressor is always in a variable working condition operation state in the gas charging process, compressed air in the gas discharging process is throttled and reduced to a specified pressure and then enters the expander, the system operation working condition is poor, the energy storage efficiency is far lower than that in the constant-pressure operation working condition, and the operation benefit of the energy storage power station is adversely affected.
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides the gas storage system with high energy storage efficiency and low cost.
The embodiment of the invention provides a gas storage method which is simple and convenient to operate.
The gas storage system of the embodiment of the invention comprises: a gas storage; the air bag is arranged in the air storage, and compressed air is suitable for being stored in the air bag; the medium is arranged between the gas storage and the gas bag, the gas bag has a first working condition and a second working condition, the first working condition is that the medium is contracted in liquefied volume or the medium is discharged out of the gas storage so as to expand the gas bag and charge the compressed air, and the second working condition is that the medium is expanded in gasified volume or the medium is refilled into the gas storage so as to contract the gas bag and release the compressed air.
According to the air storage system provided by the embodiment of the invention, the air storage and the air bags are arranged, compressed air is stored in the air bags, so that the volume utilization rate of the air storage system is improved, the engineering cost of the air storage system is reduced, and the large-scale commercial application of the compressed air energy storage power station is facilitated.
In some embodiments, the gas storage system further comprises a heat exchange assembly provided on at least one of an inner circumferential surface of the gas storage or an outer circumferential surface of the gas storage, the heat exchange assembly cooling the medium to liquefy the medium to cause the airbag to contract in the first operating mode, and the heat exchange assembly heating the medium to gasify the medium to cause the airbag to expand in the second operating mode.
In some embodiments, the heat exchange assembly is a heat exchange sleeve that may be sleeved on an outer peripheral side of the gas reservoir and/or the heat exchange sleeve may be sleeved on an inner peripheral side of the gas reservoir.
In some embodiments, the heat exchange assembly is a plurality of heat exchange tubes, the heat exchange tubes extend along the length direction of the gas storage, one part of the plurality of heat exchange tubes is arranged at the top of the gas storage, and the other part of the plurality of heat exchange tubes is arranged at the bottom of the gas storage.
In some embodiments, the gas storage system further comprises a medium reservoir, a gas extraction assembly, a heating assembly, a refrigeration assembly and a power source, wherein the gas extraction assembly is respectively communicated with the gas reservoir and the refrigeration assembly so that the medium is liquefied by the refrigeration assembly and stored in the medium reservoir, the power source is respectively communicated with the heating assembly and the medium reservoir so that the medium in the medium reservoir flows into the heating assembly by the power source, and the heating assembly is respectively communicated with the medium reservoir and the gas reservoir so that the gasified medium flows into the gas reservoir and the medium reservoir.
The gas storage system of the embodiment of the invention comprises: a gas storage; the air bag is arranged in the air storage, and compressed air is suitable for being stored between the air storage and the air bag; the medium is arranged on the air bag, the air bag is provided with a third working condition and a fourth working condition, in the third working condition, the medium is contracted in liquefied volume or is discharged out of the air bag, so that the air bag is contracted to enable compressed air to be filled between the air storage and the air bag, and in the fourth working condition, the medium is expanded in gasified volume or is refilled into the air bag, so that the air bag is expanded to enable the compressed air to be released between the air storage and the air bag.
According to the air storage system provided by the embodiment of the invention, the air storage and the air bags are arranged, compressed air is stored between the air bags and the air storage, the volume utilization rate of the air storage system is improved, the engineering cost of the air storage system is reduced, and the large-scale commercial application of the compressed air energy storage power station is facilitated.
In some embodiments, the gas storage system further comprises a heat exchange assembly provided on at least one of an inner peripheral surface of the gas bladder or an outer peripheral surface of the gas bladder, the heat exchange assembly cooling the medium to liquefy the medium to cause the gas bladder to contract in the third operating mode, and the heat exchange assembly heating the medium to gasify the medium to cause the gas bladder to expand in the fourth operating mode.
In some embodiments, the heat exchange assembly is a plurality of heat exchange tubes, the heat exchange tubes extend along the length direction of the air reservoir, one part of the plurality of heat exchange tubes is arranged at the top of the air bag, and the other part of the plurality of heat exchange tubes is arranged at the bottom of the air bag.
In some embodiments, the gas storage system further comprises a medium reservoir, a gas extraction assembly, a heating assembly, a refrigeration assembly, and a power source, wherein the gas extraction assembly is respectively communicated with the gas bag and the refrigeration assembly so that the medium is liquefied by the refrigeration assembly and stored in the medium reservoir, the power source is respectively communicated with the heating assembly and the medium reservoir so that the medium in the medium reservoir flows into the heating assembly by the power source, and the heating assembly is respectively communicated with the medium reservoir and the gas bag so that the gasified medium flows into the gas bag and the medium reservoir.
In some embodiments, the air extraction assembly is any one of a fan and a first compressor, the heating assembly is any one of a heater and a regenerator, the refrigeration assembly is any one of a first cooler and a regenerator, and the power source is a medium pump.
In some embodiments, the air extraction assembly is a first compressor, and the air storage system further includes a first expansion valve in communication with the refrigeration assembly and the media store, respectively, such that the media flowing from the refrigeration assembly flows into the media store through the first expansion valve.
In some embodiments, the air extraction assembly is a fan, the heating assembly and the cooling assembly are both cold accumulators, the power source is a second compressor, and the air storage system further includes a second expansion valve in communication with the medium reservoir and the second compressor, respectively, such that the medium flowing from the medium reservoir flows into the second compressor through the second expansion valve.
In some embodiments, the air extraction assembly is a third compressor, the refrigeration assembly is a second cooler, the heating assembly comprises a first heat accumulator and a gas expander, the power source is a medium pump, the air storage system further comprises a liquid expander and a second heat accumulator, the first heat accumulator comprises a first channel and a second channel which are independent and can perform heat exchange, the first channel is respectively communicated with the air extraction assembly and the refrigeration assembly so as to store and absorb heat of the medium flowing out of the air extraction assembly and convey the medium to the refrigeration assembly, the second channel is respectively connected with the power source and the gas expander so as to gasify the medium flowing out of the power source and convey the medium into the gas expander, one end of the second heat accumulator is communicated with the gas expander so as to store and absorb heat from the gas expander, and the other end of the second heat accumulator is respectively communicated with the air storage reservoir or the air bag so as to flow into the medium or the air bag.
The gas storage method of the embodiment of the invention adopts the gas storage system of any one of the above embodiments, and comprises the following steps: s1: storing compressed air in an air bag, and storing a medium between an air storage and the air bag; s2: liquefying the medium while the compressed air assembly stores energy to expand the bladder so as to store the compressed air, during which the pressure within the bladder is maintained constant so as to maintain the compressed air pressure constant; s3: the medium is gasified upon release of energy from the compressed air assembly to compress the bladder such that the compressed air is expelled, during which the pressure within the bladder is maintained constant to maintain the compressed air pressure constant.
In some embodiments, the medium may be drawn from between the reservoir and the bladder and stored in liquefied form when the compressed air assembly stores energy, and gasified and re-introduced between the reservoir and the bladder when the compressed air assembly releases energy.
The gas storage method of the embodiment of the invention adopts the gas storage system of any one of the above embodiments, and comprises the following steps: s1: storing compressed air between an air bag and an air reservoir, a medium being stored within the air bag; s2: liquefying the medium when the compressed air assembly stores energy to compress the air bag so as to store the compressed air between the air storage and the air bag, and keeping the pressure between the air storage and the air bag constant so as to keep the pressure of the compressed air constant; s3: and gasifying the medium when the compressed air assembly releases energy to expand the air bag so as to discharge the compressed air between the air storage and the air bag, and keeping the pressure between the air storage and the air bag constant so as to keep the pressure of the compressed air constant.
In some embodiments, the medium may be withdrawn from the bladder and stored in liquefied form when the compressed air assembly stores energy, and gasified and re-introduced into the bladder when the compressed air assembly releases energy.
In some embodiments, when the compressed air component stores energy, the medium converts electric energy into pressure potential energy of the medium and heat of the medium in a compression mode of the third compressor so as to realize additional energy storage, when the compressed air component releases energy, the medium generates electricity through the gas expander so as to convert the pressure potential energy of the medium and the heat of the medium into electric energy so as to realize additional energy release, and the heat in the medium can be collected through the first heat accumulator or the second heat accumulator.
Drawings
Fig. 1 is a schematic configuration view of a gas storage system according to a first embodiment of the present invention.
Fig. 2 is a schematic view of the structure of medium gasification of a gas storage system according to a second embodiment of the present invention.
Fig. 3 is a schematic diagram of the structure of the medium liquefaction of the gas storage system of the second embodiment of the present invention.
Fig. 4 is a schematic diagram of the structure of the medium liquefaction of the gas storage system of the third embodiment of the present invention.
Fig. 5 is a schematic view of the structure of medium gasification of a gas storage system according to a third embodiment of the present invention.
Fig. 6 is a schematic diagram of the structure of the medium liquefaction of the gas storage system of the fourth embodiment of the present invention.
Fig. 7 is a schematic view of the structure of medium gasification of a gas storage system according to a fourth embodiment of the present invention.
Fig. 8 is a schematic diagram of the structure of medium liquefaction of a gas storage system according to a fifth embodiment of the present invention.
Fig. 9 is a schematic view showing the structure of medium gasification of a gas storage system according to a fifth embodiment of the present invention.
Fig. 10 is a schematic view of the structure of medium liquefaction of a gas storage system according to a sixth embodiment of the present invention.
Fig. 11 is a schematic view showing the structure of medium gasification of a gas storage system according to a sixth embodiment of the present invention.
Reference numerals:
a gas storage system 100;
a gas storage 1; an air bag 2; a heat exchange assembly 3; a heat exchange jacket 31; a heat exchange tube 32;
a media store 4;
an air extraction assembly 5; a blower 51; a first compressor 52; a second compressor 53; a third compressor 54;
a heating assembly 6; a heater 61;
a refrigeration assembly 7; a first cooler 71; a regenerator 72; a first flow path 721; a second flow path 722; a second cooler 73; a third cooler 74;
a medium pump 8;
a first expansion valve 9; a second expansion valve 10; a first regenerator 101; a first channel 1011; a second channel 1012; a second regenerator 102; a third passage 1021; a fourth channel 1022; a gas expander 103; a liquid expander 104.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A gas storage system 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 11.
As shown in fig. 1 and 4 to 11, the gas storage system 100 of the embodiment of the present invention includes a gas storage 1, a gas bag 2, and a medium.
The air bag 2 is provided in the air reservoir 1, and the air bag 2 is adapted to store compressed air therein.
The medium is arranged between the gas reservoir 1 and the gas bladder 2, and the gas bladder 2 has a first condition in which the medium liquefies and contracts in volume or the medium is discharged from the gas reservoir 1 so that the gas bladder 2 expands and fills with compressed air, and a second condition in which the medium evaporates and expands in volume or the medium is refilled into the gas reservoir 1 so that the gas bladder 2 contracts and releases compressed air. Specifically, the air storage 1 may be a pipeline air storage, or an underground cave air storage, the air bag 2 is a flexible air bag and is arranged in the air storage 1, the air bag 2 is in a first working condition when the compressed air component stores energy, so that compressed air is stored in the air bag 2 through expansion of the air bag 2, and the air bag 2 is in a second working condition when the compressed air component releases energy, so that the compressed air is discharged out of the air bag 2 through contraction of the air bag 2.
According to the gas storage system 100 provided by the embodiment of the invention, the gas storage 1 and the air bag 2 are arranged, and when the compressed air component releases energy, the compressed air is completely discharged from the air bag 2 through the contraction of the air bag 2, so that the volume utilization rate of the gas storage system 100 is improved, and the pressure in the air bag 2 is ensured to be unchanged.
In some embodiments, the gas storage system 100 further includes a heat exchange assembly 3, where the heat exchange assembly 3 is disposed on at least one of an inner circumferential surface of the gas storage 1 or an outer circumferential surface of the gas storage 1, and in a first condition, the heat exchange assembly 3 cools the medium to liquefy the medium so as to shrink the gas bag 2, and in a second condition, the heat exchange assembly 3 heats the medium so as to gasify the medium so as to expand the gas bag 2. Specifically, the medium may be carbon dioxide, the working pressure is 7MPa, the gas-liquid phase transition temperature of the medium is 28.7 ℃, as the gas-liquid transition process of the medium under the working pressure can generate density change of more than three times, correspondingly, the volume of the air bag 2 is changed by more than three times, when the compressed air component stores energy, the medium is in a gas state, the heat exchange component 3 is filled with low-temperature heat exchange medium, the low-temperature heat exchange medium exchanges heat with the medium through the heat exchange component 3 to liquefy the medium so as to expand the air bag 2, thereby storing compressed air, when the compressed air component releases energy, the heat exchange component 3 is filled with high-temperature heat exchange medium, and the high-temperature heat exchange medium exchanges heat with the medium through the heat exchange component 3 so as to gasify the medium, thereby contracting the air bag 2, and discharging the compressed air in the air bag 2
It will be appreciated that: operating pressure = pressure in reservoir 1 = pressure in bladder 2 = pressure in medium reservoir 4.
In some embodiments, the heat exchange assembly 3 is a heat exchange jacket 31, and the heat exchange jacket 31 may be sleeved on the outer circumferential side of the gas storage 1, and/or the heat exchange jacket 31 may be provided on the inner circumferential side of the gas storage 1. Specifically, as shown in fig. 1, the heat exchange jacket 31 may be provided according to actual conditions, for example: the heat exchange sleeve 31 may be sleeved on the outer circumferential side of the gas storage 1, or the heat exchange sleeve 31 is installed on the inner circumferential surface of the gas storage 1 and located between the gas storage 1 and the air bag 2, or two heat exchange sleeves 31 are provided, one heat exchange sleeve 31 is sleeved on the outer circumferential side of the gas storage 1, and the other heat exchange sleeve 31 is provided on the inner circumferential surface of the gas storage 1.
Because of the density difference, when the compressed air assembly stores energy, the gaseous medium is located at the upper portion of the air bag 2, when the compressed air assembly releases energy, the liquid medium is located at the lower portion of the air bag 2, so in some embodiments, the heat exchange sleeve 31 has at least one first port and at least one second port, the at least one first port is located at the upper end of the heat exchange sleeve 31, the at least one second port is located at the lower end of the heat exchange sleeve 31, when the compressed air assembly stores energy, the low-temperature heat exchange medium flows into the heat exchange sleeve 31 through the first port and flows out of the heat exchange sleeve 31 through the second port after heat exchange, and when the compressed air assembly releases energy, the high-temperature heat exchange medium flows into the heat exchange sleeve 31 through the second port and flows out of the heat exchange sleeve 31 through the first port after heat exchange, thereby improving the heat exchange efficiency of the heat exchange sleeve 31.
In some embodiments, the heat exchange assembly 3 is a plurality of heat exchange tubes 32, the heat exchange tubes 32 extend along the length direction (left-right direction as shown in fig. 2) of the gas storage 1, one part of the plurality of heat exchange tubes 32 is disposed at the top of the gas storage 1, and another part of the plurality of heat exchange tubes 32 is disposed at the bottom of the gas storage 1. Specifically, the heat exchange tube 32 extends along the left-right direction, a part of the heat exchange tube 32 is arranged at the top of the air storage 1, another part of the heat exchange tube 32 is arranged at the bottom of the air storage 1, the plurality of heat exchange tubes 32 are connected in parallel, two ends of the heat exchange tube 32 are collected, one end of the heat exchange tube 32 arranged at the top of the air storage 1 is collected at the third port, one end of the heat exchange tube 32 arranged at the bottom of the air storage 1 is collected at the fourth port, when the compressed air component stores energy, a low-temperature heat exchange medium flows into the heat exchange tube 32 through the third port and flows out of the heat exchange tube 32 after heat exchange, and when the compressed air component releases energy, a high-temperature heat exchange medium flows into the heat exchange tube 32 through the fourth port and flows out of the heat exchange tube 32 after heat exchange, so that the heat exchange efficiency of the heat exchange tube 32 is improved, and the arrangement of the heat exchange tube 32 is more reasonable.
In some embodiments, gas storage system 100 further comprises a media reservoir 4, a gas extraction assembly 5, a heating assembly 6, a refrigeration assembly 7, and a power source.
The air extraction assembly 5 is respectively communicated with the air storage 1 and the refrigeration assembly 7 so that the medium is liquefied through the refrigeration assembly 7 and stored in the medium storage 4, the power source is respectively communicated with the heating assembly 6 and the medium storage 4 so that the medium in the medium storage 4 flows into the heating assembly 6 through the power source, and the heating assembly 6 is respectively communicated with the medium storage 4 and the air storage 1 so that the gasified medium flows into the air storage 1 and the medium storage 4.
Specifically, as shown in fig. 4-11, the medium is carbon dioxide, the inlet of the air extraction assembly 5 is communicated with the air storage 1, the outlet of the air extraction assembly 5 is communicated with the inlet of the refrigeration assembly 7, the outlet of the refrigeration assembly 7 is communicated with the top of the medium storage 4, the bottom of the medium storage 4 is communicated with the inlet of the power source, the inlet of the outlet heating assembly 6 of the power source is communicated with the air storage 1 and the top of the medium storage 4, when the compressed air assembly stores energy, the medium is extracted from the air storage 1 and the medium storage 4 through the air extraction assembly 5 and is sent into the refrigeration assembly 7 to be liquefied and stored in the medium storage 4, when the compressed air assembly releases energy, the liquefied medium is pumped into the heating assembly 6 through the power source, and is sent into the air storage 1 and the air bag 2 after being gasified through the heating assembly 6, so that the compressed air is discharged.
As shown in fig. 2 and 3, the gas storage system 100 of the embodiment of the present invention includes a gas storage 1, a gas bag 2, and a medium.
The air reservoir 1 and the bladder 2 are adapted to store compressed air therebetween.
The medium is provided in the air bag 2, and the air bag 2 has a third condition in which the medium liquefied volume contracts or the medium is discharged out of the air bag 2 so that the air bag 2 contracts to charge the compressed air between the air storage 1 and the air bag 2, and a fourth condition in which the medium gasified volume expands or the medium is refilled into the air bag 2 so that the air bag 2 expands to release the compressed air between the air storage 1 and the air bag 2. Specifically, the air storage 1 may be a pipeline air storage, or an underground cave air storage, the air bag 2 is a flexible air bag and is arranged in the air storage 1, the air bag 2 is in a third working condition when the compressed air component stores energy, so that compressed air is stored between the air storage 1 and the air bag 2 through shrinkage of the air bag 2, and the air bag 2 is in a fourth working condition when the compressed air component releases energy, so that the compressed air is discharged between the air storage 1 and the air bag 2 through expansion of the air bag 2.
According to the gas storage system 100 provided by the embodiment of the invention, the gas storage 1 and the gas bag 2 are arranged, and when the compressed air component releases energy, the compressed air is completely discharged from the space between the gas bag 2 and the gas storage 1 through the expansion of the gas bag 2, so that the volume utilization rate of the gas storage system 100 is improved, and the pressure in the space between the gas storage 1 and the gas bag 2 is ensured to be unchanged.
In some embodiments, the gas storage system 100 further includes a heat exchange assembly 3, where the heat exchange assembly 3 is disposed on at least one of an inner circumferential surface of the gas bag 2 or an outer circumferential surface of the gas bag 2, and in a third operating condition, the heat exchange assembly 3 cools the medium to liquefy the medium so as to shrink the gas bag 2, and in a fourth operating condition, the heat exchange assembly 3 heats the medium so as to gasify the medium so as to expand the gas bag 2.
Specifically, the medium may be carbon dioxide, the working pressure is 7MPa, the gas-liquid phase transition temperature of the medium is 28.7 ℃, as the gas-liquid transition process of the medium under the working pressure can generate density change of more than three times, correspondingly, the volume of the air bag 2 is changed by more than three times, when the compressed air component stores energy, the medium is in a gas state, the heat exchange component 3 is filled with low-temperature heat exchange medium, the low-temperature cooling medium exchanges heat with the medium through the heat exchange component 3 to liquefy the medium so as to enable the air bag 2 to shrink, thereby compressed air is stored between the air bag 2 and the air storage 1, when the compressed air component releases energy, the high-temperature heat exchange medium is filled into the heat exchange component 3 to exchange heat with the medium, so that the air bag 2 is inflated through the heat exchange component 3 to gasify the medium, and compressed air between the air bag 2 and the air storage 1 is discharged.
In some embodiments, the heat exchange assembly 3 is a plurality of heat exchange tubes 32, the heat exchange tubes 32 extend along the length direction of the air reservoir 1, one part of the plurality of heat exchange tubes 32 is disposed at the top of the air bag 2, and another part of the plurality of heat exchange tubes 32 is disposed at the bottom of the air bag 2. Specifically, the heat exchange tube 32 extends along the left-right direction, a part of the heat exchange tube 32 is arranged at the top of the air storage 1, another part of the heat exchange tube 32 is arranged at the bottom of the air storage 1, the plurality of heat exchange tubes 32 are connected in parallel, two ends of the heat exchange tube 32 are collected, one end of the heat exchange tube 32 arranged at the top of the air storage 1 is collected at the third port, one end of the heat exchange tube 32 arranged at the bottom of the air storage 1 is collected at the fourth port, when the compressed air component stores energy, a low-temperature heat exchange medium flows into the heat exchange tube 32 through the third port and flows out of the heat exchange tube 32 after heat exchange, and when the compressed air component releases energy, a high-temperature heat exchange medium flows into the heat exchange tube 32 through the fourth port and flows out of the heat exchange tube 32 after heat exchange, so that the heat exchange efficiency of the heat exchange tube 32 is improved, and the arrangement of the heat exchange tube 32 is more reasonable.
In some embodiments, gas storage system 100 further comprises a media reservoir 4, a gas extraction assembly 5, a heating assembly 6, a refrigeration assembly 7, and a power source.
The air extraction assembly 5 is respectively communicated with the air bag 2 and the refrigeration assembly 7 so that the medium is liquefied by the refrigeration assembly 7 and stored in the medium reservoir 4, the power source is respectively communicated with the heating assembly 6 and the medium reservoir 4 so that the medium in the medium reservoir 4 flows into the heating assembly 6 by the power source, and the heating assembly 6 is respectively communicated with the medium reservoir 4 and the air bag 2 so that the gasified medium flows into the air bag 2 and the medium reservoir 4. Specifically, the medium is carbon dioxide, the inlet of the air extraction assembly 5 is communicated with the air bag 2, the outlet of the air extraction assembly 5 is communicated with the inlet of the refrigerating assembly 7, the outlet of the refrigerating assembly 7 is communicated with the bottom of the medium reservoir 4, the bottom of the medium reservoir 4 is communicated with the inlet of the power source, the inlet of the outlet heating assembly 6 of the power source is communicated with the top of the medium reservoir 4 and the air bag 2, when the compressed air assembly stores energy, the medium is extracted from the air bag 2 and the medium reservoir 4 through the air extraction assembly 5 and is fed into the refrigerating assembly 7 to be liquefied and stored in the medium reservoir 4, when the compressed air assembly releases energy, the liquefied medium is pumped into the heating assembly 6 through the power source, and is gasified through the heating assembly 6 and then is fed into the medium reservoir 4 and the air bag 2, so that the compressed air is discharged.
In some embodiments, the extraction assembly 5 is any one of the fan 51 and the first compressor 52, the heating assembly 6 is any one of the heater 61 and the regenerator 72, the refrigeration assembly 7 is any one of the first cooler 71 and the regenerator 72, and the power source is the medium pump 8. Specifically, the air extraction assembly 5, the heating assembly 6, the refrigeration assembly 7 and the power source can be selected according to actual situations, or for example: the suction assembly 5 is a circulation fan 51, the heating assembly 6 is a heater 61, the refrigeration assembly 7 is a first cooler 71, or for example: the air extraction component 5 is a circulating fan 51, and the heating component 6 and the refrigerating component 7 are cold accumulators 72. Or for example: the suction unit 5 is a first compressor 52, the heating unit 6 is a heater 61, and the cooling unit 7 is a first cooler 71. Or for example: the extraction assembly 5 is a first compressor 52, and the heating assembly 6 and the cooling assembly 7 are cold accumulators 72.
In some embodiments, the suction assembly 5 is a first compressor 52, and since the first compressor 52 increases the pressure of the medium, in order to ensure pressure equalization of the medium reservoir 4, the gas storage system 100 further comprises in some embodiments a first expansion valve 9, the first expansion valve 9 being in communication with the refrigeration assembly 7 and the medium reservoir 4, respectively, such that medium flowing from the refrigeration assembly 7 flows into the medium reservoir 4 through the first expansion valve 9. Specifically, as shown in fig. 8 and 9, the inlet of the first expansion valve 9 is communicated with the outlet of the refrigeration assembly 7, and the outlet of the first expansion valve 9 is communicated with the bottom of the medium reservoir 4, so that the liquefied medium is decompressed, and the pressure balance in the gas storage system 100 is ensured.
In some embodiments, the air extraction assembly 5 is a fan 51, the heating assembly 6 and the cooling assembly 7 are both cold reservoirs 72, and the air storage system 100 further includes a second expansion valve 10, the second expansion valve 10 being in communication with the media reservoir 4 and the second compressor 53, respectively, such that media flowing from the media reservoir 4 flows into the second compressor 53 through the second expansion valve 10.
Specifically, as shown in fig. 6 and 7, the pumping assembly 5 is a circulating fan 51, the regenerator 72 has a first flow path 721 and a second flow path 722 which are independent and can perform heat exchange, the inlet of the circulating fan 51 is communicated with the outlet of the air bag 2 or the outlet of the air storage 1, two ends of the first flow path 721 are respectively communicated with the outlet of the circulating fan 51 and the bottom of the medium storage 4, the inlet of the second expansion valve 10 is communicated with the bottom of the medium storage 4, two ends of the second flow path 722 are respectively communicated with the outlet of the second expansion valve 10 and the inlet of the second compressor 53, the outlet of the second compressor 53 is communicated with the top of the air storage 1, when the compressed air assembly stores energy, the working pressure is 3.8MPa, the gas-liquid phase temperature of the medium is 3.3 ℃, the medium is pumped out through the circulating fan 51 and fed into the first flow path 721 to absorb cold energy from the regenerator 72 and liquefy, when the compressed air assembly releases energy, the medium is depressurized through the second expansion valve 10 to 3.3MPa, the gas-liquid temperature of the medium is-2.0 ℃ and the medium releases the cold energy and is stored in the regenerator 2, the phase change of the regenerator 72 is liquefied, and the cold energy is obtained from the regenerator 72. When the energy storage and release circulation operation is performed, the volume of the gas storage 1 is fully utilized.
In some embodiments, the air extraction assembly 5 is the third compressor 54, the refrigeration assembly 7 is the second cooler 73, the heating assembly 6 comprises a first heat accumulator 101 and a gas expander 103, the gas storage system 100 further comprises a liquid expander 104 and a second heat accumulator 102, the first heat accumulator 101 comprises a first channel 1011 and a second channel 1012 which are mutually independent and can perform heat exchange, the first channel 1011 is respectively communicated with the air extraction assembly 5 and the refrigeration assembly 7 so as to store and absorb heat of the medium flowing out of the air extraction assembly 5 and convey the medium to the refrigeration assembly 7, the second channel 1012 is respectively connected with the medium pump 8 and the gas expander 103 so as to gasify the medium flowing out of the medium pump 8 and convey the medium into the gas expander 103, one end of the second heat accumulator 102 is communicated with the gas expander 103 so as to store and absorb heat of the medium outputted from the gas expander 103, and the other end of the second heat accumulator 102 is respectively communicated with the medium reservoir 4 and the gas reservoir 1 or the gas bag 2 so as to flow the medium into the medium 4 and the gas reservoir 1 or the gas bag 2.
Specifically, as shown in fig. 10 and 11, the inlet of the third compressor 54 is communicated with the airbag 2 or the gas storage 1, the first channel 1011 is respectively communicated with the outlet of the third compressor 54 and the inlet of the second cooler 73, the outlet of the second cooler 73 is communicated with the inlet of the liquid expander 104, the outlet of the liquid expander 104 is communicated with the bottom of the medium reservoir 4, the bottom of the medium reservoir 4 is communicated with the inlet of the medium pump 8, the two ends of the second channel 1012 are respectively communicated with the outlet of the medium pump 8 and the inlet of the gas expander 103, the outlet of the gas expander 103 is connected with the inlet of the second heat accumulator 102, and the outlet of the second heat accumulator 102 is respectively communicated with the gas storage 1 or the airbag 2.
When the compressed air component stores energy, the third compressor 54 is used for pumping out and pressurizing the medium, the first heat accumulator 101 is used for releasing heat in the medium and storing the heat in the first heat accumulator 101, the second cooler 73 is used for liquefying the medium, the liquid expander 104 is used for expanding and acting, the medium is conveyed and stored in the medium storage 4, when the compressed air component releases energy, the liquefied medium is pumped into the first heat accumulator 101 through the medium pump 8, gasified by the first heat accumulator 101 and then sent into the gas expander 103 to act, the second heat accumulator 102 is used for absorbing residual heat in the medium and storing the residual heat in the second heat accumulator 102, the medium is divided into two parts, one part enters the medium storage 4, and the other part enters the gas storage 1 or the air bag 2, so that the compressed air is discharged.
In some embodiments, as shown in fig. 10 and 11, the second heat accumulator 102 includes a third channel 1021 and a fourth channel 1022 which are independent from each other and can perform heat exchange, an inlet of the third channel 1021 is respectively communicated with an outlet of a top end of the medium reservoir 4 and an outlet of the gas reservoir 1 or an outlet of the air bag 2, an outlet of the third channel 1021 is connected with an inlet of the third compressor 54, so that non-liquefied medium in the medium reservoir 4 is mixed with medium pumped out by the gas reservoir 1 or the air bag 2, and after the medium is heated in the third channel, the medium is compressed by the third compressor 54, an inlet of the fourth channel 1022 is communicated with an outlet of the gas expander 103, and an outlet of the fourth channel 1022 is respectively communicated with the gas reservoir 1 and the medium reservoir 4, so as to absorb waste heat of the medium flowing out from the gas expander 103 and store the waste heat in the second heat accumulator 102, and the second heat accumulator 102 divides the medium into two paths, and respectively enters the gas reservoir 1 and the medium reservoir 4, so that compressed air is discharged.
In some embodiments, the medium may be carbon dioxide, ethane, nitrous oxide, R41 refrigerant, or a mixture thereof.
A specific example of a gas storage system 100 of the present invention will be described with reference to fig. 2 and 3;
the gas storage system 100 includes a gas bladder 2, a gas storage 1, and a plurality of heat exchange pipes 32.
The gasbag 2 is established in gas storage 1, the pipeline that heat exchange tube 32 extends along left and right directions, a plurality of pipe heat pipes link each other, a plurality of heat exchange tube 32's partly are established at the up end of gasbag 2, the heat exchange tube 32 of gasbag 2 up end has the third mouth, another part of a plurality of heat exchange tube 32 is established at the lower terminal surface of gasbag 2, compressed air can be stored between gas storage 1 and gasbag 2, medium storage is in gasbag 2, the heat exchange tube 32 of gasbag 2 lower terminal surface has the fourth mouth, medium selection carbon dioxide and storage are in gasbag 2. The operating pressure of the gas storage system 100 was 7MPa and the gas-liquid phase transition temperature of the medium was 28.7 ℃.
When the compressed air component stores energy, the low-temperature heat exchange medium flows into the heat exchange tube 32 through the third port and flows out of the heat exchange tube 32 from the fourth port after heat exchange, so that heat exchange is carried out between the low-temperature heat exchange medium and the medium, the medium is liquefied, so that the air bag 2 contracts to enable the air storage 1 to store compressed air, when the compressed air component releases energy, the high-temperature heat exchange medium flows into the heat exchange tube 32 through the fourth port and flows out of the heat exchange tube 32 from the third port after heat exchange, so that heat exchange is carried out between the high-temperature heat exchange medium and the medium, and the air bag 2 expands by gasifying the medium, so that the compressed air is discharged from the air storage 1.
A specific example of a gas storage system 100 of the present invention is described below with reference to fig. 1.
The gas storage system 100 includes a gas bladder 2, a gas storage 1, and a heat exchange jacket 31.
The gasbag 2 is arranged in the gas storage 1, the heat exchange sleeve 31 can be sleeved on the outer peripheral side of the gas storage 1, the heat exchange sleeve 31 is provided with at least one first port and at least one second port, the at least one first port is positioned at the upper end of the heat exchange sleeve 31, the at least one second port is positioned at the lower end of the heat exchange sleeve 31, compressed air can be stored in the gasbag 2, a medium is carbon dioxide and is stored between the gasbag 2 and the gas storage 1, the working pressure of the gas storage system 100 is 7MPa, and the gas-liquid phase transition temperature of the medium is 28.7 ℃.
When the compressed air component stores energy, the low-temperature heat exchange medium flows into the heat exchange sleeve 31 through the first port and flows out of the heat exchange sleeve 31 from the second port after heat exchange, so that the low-temperature heat exchange medium exchanges heat with the medium, the medium is liquefied so that the air bag 2 expands to store compressed air, when the compressed air component releases energy, the high-temperature heat exchange medium flows into the heat exchange sleeve 31 through the second port and flows out of the heat exchange sleeve 31 from the first port after heat exchange, so that the high-temperature heat exchange medium exchanges heat with the medium, and the air bag 2 contracts to discharge the compressed air by medium gasification.
A specific example of a gas storage system 100 according to the present invention will be described with reference to fig. 4 and 5.
The gas storage system 100 includes a gas bladder 2, a gas storage 1, a circulation fan 51, a heater 61, a medium pump 8, a first cooler 71, and a medium reservoir 4.
The air bag 2 is arranged in the air storage 1, the compressed air is stored in the air bag 2, the medium is carbon dioxide and is stored between the air storage 1 and the air bag 2, the inlet of the circulating fan 51 is communicated with the air storage 1, the outlet of the circulating fan 51 is communicated with the inlet of the first cooler 71, the outlet of the first cooler 71 is communicated with the bottom of the medium storage 4, the bottom of the medium storage 4 is communicated with the inlet of the medium pump 8, the outlet of the medium pump 8 is communicated with the inlet of the heater 61, the outlet of the heater 61 is respectively communicated with the medium storage 4 and the air storage 1, the working pressure of the air storage system 100 is 7MPa, and the gas-liquid phase transition temperature of the medium is 28.7 ℃.
When the compressed air component stores energy, the gaseous medium in the air storage 1 and the medium reservoir 4 is pumped out by the circulating fan 51, cooled and liquefied by the first cooler 71, and the liquid medium is input into the medium reservoir 4, and at the same time, the air bag 2 is filled with compressed air with constant pressure until the air reaches the specified air quantity. When the compressed air component releases energy, the air bag 2 is filled with compressed air, the medium in the medium reservoir 4 is pumped out by the medium pump 8, heated and gasified by the heater 61, and then enters the medium reservoir 4 and the air reservoir 1 respectively, and meanwhile, the air bag 2 is discharged with constant pressure of compressed air until the air bag is emptied.
A specific example of a gas storage system 100 of the present invention will be described with reference to fig. 6 and 7.
The gas storage system 100 includes a gas bladder 2, a gas storage 1, a circulation fan 51, a second compressor 53, a second expansion valve 10, a regenerator 72, and a medium reservoir 4.
The air bag 2 is arranged in the air storage 1, the compressed air is stored in the air bag 2, the medium is carbon dioxide and is stored between the air storage 1 and the air bag 2, the inlet of the circulating fan 51 is communicated with the air storage 1, the outlet of the circulating fan 51 is communicated with the inlet of the first flow path 721 of the regenerator 72, the outlet of the first flow path 721 of the regenerator 72 is communicated with the bottom of the medium storage 4, the bottom of the medium storage 4 is communicated with the inlet of the second expansion valve 10, the outlet of the second expansion valve 10 is communicated with the inlet of the second flow path 722 of the regenerator 72, the outlet of the second flow path 722 of the regenerator 72 is communicated with the inlet of the second compressor 53, and the outlet of the second compressor 53 is communicated with the medium storage 4 and the air storage 1.
When the compressed air component stores energy, the working pressure of the air storage system 100 is 3.8MPa, the gas-liquid phase transition temperature of the medium is 3.3 ℃, gaseous medium in the air storage 1 and the medium storage 4 is pumped out by the circulating fan 51, the cold in the cold storage 72 is liquefied and absorbed by the cold storage 72, the liquid medium is input into the medium storage 4, meanwhile, the air bag 2 is filled with compressed air with constant pressure until the air quantity reaches the specified air quantity, when the compressed air component releases energy, the pressure of the medium is reduced to 3.3MPa after the pressure of the compressed air component is reduced by the second expansion valve 10, the corresponding gas-liquid phase transition temperature is-2.0 ℃, the air bag 2 is filled with compressed air, the medium in the medium storage 4 is decompressed by the second expansion valve 10, then the cold storage 72 releases the cold and gasifies, and is pressurized to the specified pressure by the second compressor 53, and then the two streams enter the medium storage 4 and the air storage 1 respectively, and meanwhile, the compressed air with constant pressure is discharged from the air bag 2 until the air is exhausted.
A specific example of a gas storage system 100 of the present invention will be described with reference to fig. 8 and 9.
The gas storage system 100 includes a gas bladder 2, a gas storage 1, a third cooler 74, a first compressor 52, a first expansion valve 9, a medium pump 8, a regenerator 72, and a medium reservoir 4.
The air bag 2 is arranged in the air storage 1, the compressed air is used for storing the air bag 2, the medium is carbon dioxide and is stored between the air storage 1 and the air bag 2, the inlet of the first compressor 52 is communicated with the outlet of the air storage 1, the outlet of the first compressor 52 is communicated with the inlet of the third cooler 74, the outlet of the third cooler 74 is communicated with the inlet of the first flow path 721 of the cold accumulator 72, the outlet of the first flow path 721 of the cold accumulator 72 is communicated with the inlet of the first expansion valve 9, the outlet of the first expansion valve 9 is communicated with the inlet of the medium reservoir 4, the bottom of the medium reservoir 4 is communicated with the inlet of the medium pump 8, the outlet of the medium pump 8 is communicated with the inlet of the second flow path 722 of the cold accumulator 72, the outlet of the second flow path 722 of the cold accumulator 72 is respectively communicated with the air bag 2 and the top of the medium reservoir 4, the working pressure of the air storage system 100 is 3.3MPa, and the gas-liquid phase transition temperature of the medium is-2.0 ℃.
When the compressed air component stores energy, the gaseous medium in the air storage 1 and the medium reservoir 4 is pumped out by the first compressor 52, cooled by the third cooler 74, liquefied by the cold accumulator 72 and absorbed the cold in the cold accumulator 72, and the liquid medium is decompressed by the first expansion valve 9 and then is input into the medium reservoir 4, and meanwhile, the air bag 2 is filled with compressed air with constant pressure until the air quantity reaches the specified air quantity. When the compressed air component releases energy, the air bag 2 is filled with compressed air, the medium in the medium reservoir 4 is pumped out by the medium pump 8, the medium releases cold energy through the cold accumulator 72 and is gasified, and two streams of the medium are respectively fed into the medium reservoir 4 and the air reservoir 1, and meanwhile, the air bag 2 is discharged with the compressed air with constant pressure until the air bag is emptied.
A specific example of a gas storage system 100 of the present invention will be described with reference to fig. 10 and 11.
The gas storage system 100 includes a gas bladder 2, a gas storage 1, a third compressor 54, a second cooler 73, a first heat accumulator 101, a medium reservoir 4, a gas expander 103, a medium pump 8, a liquid expander 104, and a second heat accumulator 102.
The air bag 2 is arranged in the air storage 1, the compressed air is stored in the air bag 2, the medium is carbon dioxide and is stored between the air storage 1 and the air bag 2, the inlet of the third channel 1021 of the second heat accumulator 102 is respectively communicated with the top of the medium storage 4 and the air storage 1, the outlet of the third channel 1021 of the second heat accumulator 102 is connected with the inlet of the first channel 1011 of the first heat accumulator 101, the outlet of the first channel 1011 of the first heat accumulator 101 is communicated with the inlet of the second cooler 73, the outlet of the second cooler 73 is communicated with the inlet of the liquid expander 104, the outlet of the liquid expander 104 is communicated with the bottom of the medium storage 4, the outlet of the medium storage 4 is communicated with the inlet of the medium pump, the outlet of the medium pump is communicated with the inlet of the second channel 1012 of the first heat accumulator 101, the outlet of the second channel 1012 of the first heat accumulator 101 is communicated with the inlet of the gas expander 103, the outlet of the gas expander 103 is communicated with the inlet of the first channel 1022 of the second heat accumulator 101, the outlet of the fourth channel 1022 of the second heat accumulator 102 is respectively communicated with the medium storage 4 and the medium storage 1. The operating pressure of the gas storage system 100 is 6MPa.
When the compressed air component stores energy, the medium which is not liquefied in the medium reservoir 4 and is discharged from the air reservoir 1 is heated by the second heat accumulator 102 after being mixed, the medium is pressurized by the third compressor 54, the heat is released by the first heat accumulator 101, the high-temperature heat is stored in the first heat accumulator 101, the medium is cooled to be liquid by the second cooler 73, the liquid medium is expanded by the liquid expander 104 to do work and is depressurized and cooled, the liquid medium is filled into the medium reservoir 4, and meanwhile, the air bag 2 is filled with compressed air with constant pressure until the constant-pressure air reaches the specified air quantity. When the compressed air component releases energy, the air bag 2 is filled with compressed air, the medium in the medium reservoir 4 is raised to high pressure by the medium pump 8, the medium absorbs heat to gasify and raise to high temperature by the first heat accumulator 101, the medium expands and works by the gas expander 103, the medium releases waste heat by the second heat accumulator 102 and is stored in the second heat accumulator 102, and two streams of the medium are respectively fed into the medium reservoir 4 and the air storage 1, and meanwhile, the air bag 2 discharges the compressed air with constant pressure until the compressed air is emptied.
In summary, the medium in the gas storage system 100 may be stored in the gas storage system 100 all the time, so that the airbag 2 expands or contracts by the change of the gas-liquid of the medium, thereby storing or discharging the compressed air, or the medium periodically enters and exits the gas storage 1 or the airbag 2, so that the airbag 2 expands or contracts, thereby storing or discharging the compressed air.
It should be understood that the change of the air bag 2 in the air storage system 100 according to the embodiment of the present invention is not limited thereto, and the air bag 2 may be contracted or expanded by a mechanical structure, for example, two clamping plates are provided, one clamping plate is provided at one end of the air bag 2, and the other clamping plate is provided at the other end of the air bag 2, so that the air bag 2 is contracted or expanded by the opposite or opposite movement of the clamping plates.
The gas storage method according to the embodiment of the present invention, which adopts the gas storage system 100 according to any one of the embodiments, includes the steps of:
s1: compressed air is stored in the airbag 2, and a medium is stored between the air reservoir 1 and the airbag 2.
S2: upon storage of the compressed air assembly, the medium is liquefied to expand the bladder 2 so that the compressed air is stored, during which the pressure within the bladder 2 is kept constant in order to keep the compressed air pressure constant. Specifically, the medium is stored between the air reservoir 1 and the air bag 2, and when the stored energy is stored, the medium is changed from a gaseous state to a liquid state, thereby freeing up the storage space required for the compressed air to be filled, so that the air bag 2 is inflated to store the compressed air.
S3: upon release of the compressed air assembly, the medium is gasified to compress the bladder 2 such that the compressed air is expelled, during which the pressure within the bladder 2 is maintained constant in order to maintain the compressed air pressure constant. Specifically, when the energy is released, the air bag 2 is contracted in volume, and the medium is changed from a liquid state to a gas state, so that the space generated by the discharge of the compressed air is filled.
According to the air storage method provided by the embodiment of the invention, through the steps S1, S2 and S3, compressed air can be stored in the air bag 2, and when the compressed air component releases energy, the compressed air in the air bag 2 can be discharged out of the air bag 2, so that the volume utilization rate of the air storage system 100 is improved.
In some embodiments, medium may be drawn from between the reservoir 1 and the bladder 2 and stored in liquefied form when the compressed air assembly is charged, and gasified and re-introduced between the reservoir 1 and the bladder 2 when the compressed air assembly is discharged. Specifically, during energy storage, compressed air is filled into the air bag 2, and meanwhile, the medium is discharged between the air bag 2 and the air storage 1, so that a storage space required by filling of the compressed air is vacated, and the compressed air is converted from a gaseous state to a liquid state, so that the storage medium is convenient, and during energy release, the compressed air is discharged out of the air bag 2, the medium is converted from the liquid state to the gaseous state, and the gaseous medium is filled between the air storage 1 and the air bag 2, so that the space generated by discharging of the compressed air is filled.
The gas storage method according to the embodiment of the present invention, using the gas storage system 100 according to any one of the above embodiments, includes the following steps:
s1: compressed air is stored between the airbag 2 and the air reservoir 1, and a medium is stored in the airbag 2.
S2: when the compressed air assembly stores energy, the medium is liquefied to compress the air bag 2 so that compressed air is stored between the air storage 1 and the air bag 2, and the pressure between the air storage 1 and the air bag 2 is kept constant, so that the pressure of the compressed air is kept constant. Specifically, the medium is stored in the air bag 2, and when the energy is stored, the medium is changed from a gas state to a liquid state, so that the air bag 2 is contracted, and the compressed air is emptied into a required storage space.
S3: upon release of the compressed air assembly, the medium is gasified to expand the air bag 2 so that compressed air is discharged between the air reservoir 1 and the air bag 2, and the pressure between the air reservoir 1 and the air bag 2 is kept constant so as to keep the pressure of the compressed air constant. Specifically, when the energy is released, the medium is changed from a liquid state to a gas state, and the air bag 2 is inflated in volume, so that the space generated by the discharge of the compressed air is filled.
According to the air storage method provided by the embodiment of the invention, through the steps S1, S2 and S3, compressed air can be stored between the air bag 2 and the air storage 1, and when the compressed air assembly releases energy, the compressed air between the air bag 2 and the air storage 1 can be discharged out of the air bag 2, so that the volume utilization rate of the air storage system 100 is improved.
In some embodiments, the medium may be pumped from the bladder 2 and stored in liquefied form when the compressed air assembly stores energy, and gasified and re-introduced into the bladder 2 when the compressed air assembly releases energy. Specifically, during energy storage, compressed air is filled between the air bag 2 and the air storage 1, and meanwhile, the medium is discharged out of the air bag 2, so that a storage space required by filling the compressed air is vacated, and the compressed air is converted from a gaseous state to a liquid state, so that the storage medium is convenient, and during energy release, the compressed air is discharged between the air bag 2 and the air storage 1, the medium is converted from the liquid state to the gaseous state, and the gaseous medium is filled into the air bag 2, so that the space generated by discharging the compressed air is filled.
In some embodiments, heat in the medium may be collected by the first heat accumulator 101 or the second heat accumulator 102, the medium may store energy by compression by the third compressor 54, and the medium may release energy by power generation by the gas expander 103. Specifically, the gaseous medium discharged from the gas storage 1 or the gas bag 2 is heated by the second heat accumulator 102, compressed by the third compressor 54, released by the first heat accumulator 101 and stored, liquefied, pressurized by the medium pump 8, heated and gasified by the first heat accumulator 101, expanded by the gas expander 103, released by the second heat accumulator 102 and stored. Through the above process, when the compressed air component stores energy, the medium converts electric energy into pressure potential energy of the medium and heat of the medium in a compression mode of the third compressor 54, so that additional energy storage is achieved, and when the compressed air component releases energy, the medium generates electricity through the gas expander 103, so that the pressure potential energy of the medium and the heat of the medium are converted into electric energy, so that additional energy release is achieved.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (12)

1. A gas storage system, comprising:
A gas storage;
the air bag is arranged in the air storage, and compressed air is suitable for being stored in the air bag;
a medium disposed between the gas reservoir and the gas bladder, the gas bladder having a first condition in which the medium liquefies to expand and charge the compressed air by contracting the volume or the medium is discharged from the gas reservoir, and a second condition in which the medium evaporates to expand or the medium is refilled into the gas reservoir by contracting the gas bladder and releasing the compressed air;
the medium storage device comprises a medium storage, an air extraction assembly, a heating assembly, a refrigerating assembly and a power source, wherein the air extraction assembly is respectively communicated with the air storage and the refrigerating assembly so that the medium is liquefied by the refrigerating assembly and stored in the medium storage, the power source is respectively communicated with the heating assembly and the medium storage so that the medium in the medium storage flows into the heating assembly by the power source, and the heating assembly is respectively communicated with the medium storage and the air storage so that the gasified medium flows into the air storage and the medium storage;
The air extraction assembly is a third compressor, the refrigeration assembly is a second cooler, the heating assembly comprises a first heat accumulator and a gas expander, the power source is a medium pump, the air storage system further comprises a liquid expander and a second heat accumulator, the first heat accumulator comprises a first channel and a second channel which are independent of each other and conduct heat exchange, the first channel is respectively communicated with the air extraction assembly and the refrigeration assembly so as to store and absorb heat of the medium flowing out of the air extraction assembly and convey the medium to the refrigeration assembly, the second channel is respectively connected with the power source and the gas expander so as to gasify the medium flowing out of the power source and convey the medium into the gas expander, one end of the second heat accumulator is communicated with the gas expander so as to store and absorb heat from the gas expander, and the other end of the second heat accumulator is respectively communicated with the air storage or the air bag so as to flow the medium into the air storage or the air bag.
2. The gas storage system of claim 1, further comprising a heat exchange assembly disposed on at least one of an inner circumferential surface of the gas storage or an outer circumferential surface of the gas storage, wherein in the first condition the heat exchange assembly cools the medium to liquefy the medium to cause the bladder to contract, and in the second condition the heat exchange assembly heats the medium to gasify the medium to cause the bladder to expand.
3. The gas storage system according to claim 2, wherein the heat exchange assembly is a heat exchange sleeve, the heat exchange sleeve is sleeved on an outer peripheral side of the gas storage, and/or the heat exchange sleeve is sleeved on an inner peripheral side of the gas storage.
4. The gas storage system as claimed in claim 2, wherein the heat exchange assembly is a plurality of heat exchange pipes extending in a length direction of the gas storage, one part of the plurality of heat exchange pipes is disposed at a top of the gas storage, and the other part of the plurality of heat exchange pipes is disposed at a bottom of the gas storage.
5. A gas storage system, comprising:
a gas storage;
the air bag is arranged in the air storage, and compressed air is suitable for being stored between the air storage and the air bag;
a medium disposed within said bladder, said bladder having a third condition in which said medium liquefies and contracts or said medium is expelled from said bladder such that said bladder contracts to charge said compressed air between said reservoir and said bladder, and a fourth condition in which said medium evaporates and expands or said medium is refilled into said bladder such that said bladder expands to release said compressed air between said reservoir and said bladder;
The medium storage device comprises a medium storage, an air extraction assembly, a heating assembly, a refrigerating assembly and a power source, wherein the air extraction assembly is respectively communicated with the air bag and the refrigerating assembly so that the medium is liquefied by the refrigerating assembly and stored in the medium storage, the power source is respectively communicated with the heating assembly and the medium storage so that the medium in the medium storage flows into the heating assembly by the power source, and the heating assembly is respectively communicated with the medium storage and the air bag so that the gasified medium flows into the air bag and the medium storage;
the air extraction assembly is a third compressor, the refrigeration assembly is a second cooler, the heating assembly comprises a first heat accumulator and a gas expander, the power source is a medium pump, the air storage system further comprises a liquid expander and a second heat accumulator, the first heat accumulator comprises a first channel and a second channel which are independent of each other and conduct heat exchange, the first channel is respectively communicated with the air extraction assembly and the refrigeration assembly so as to store and absorb heat of the medium flowing out of the air extraction assembly and convey the medium to the refrigeration assembly, the second channel is respectively connected with the power source and the gas expander so as to gasify the medium flowing out of the power source and convey the medium into the gas expander, one end of the second heat accumulator is communicated with the gas expander so as to store and absorb heat from the gas expander, and the other end of the second heat accumulator is respectively communicated with the air storage or the air bag so as to flow the medium into the air storage or the air bag.
6. The gas storage system according to claim 5, further comprising a heat exchange assembly provided on at least one of an inner peripheral surface of the gas bag or an outer peripheral surface of the gas bag, wherein in the third condition, the heat exchange assembly cools the medium to liquefy the medium to cause the gas bag to contract, and in the fourth condition, the heat exchange assembly heats the medium to gasify the medium to cause the gas bag to expand.
7. The gas storage system as claimed in claim 6, wherein the heat exchange assembly is a plurality of heat exchange pipes extending in a length direction of the gas storage, one part of the plurality of heat exchange pipes is provided at a top of the gas cell, and the other part of the plurality of heat exchange pipes is provided at a bottom of the gas cell.
8. A gas storage method, characterized in that a gas storage system according to any one of the preceding claims 1-4 is used, said gas storage method comprising the steps of:
s1: storing compressed air in an air bag, and storing a medium between an air storage and the air bag;
s2: liquefying the medium while the compressed air assembly stores energy to expand the bladder so as to store the compressed air, during which the pressure within the bladder is maintained constant so as to maintain the compressed air pressure constant;
S3: the medium is gasified upon release of energy from the compressed air assembly to compress the bladder such that the compressed air is expelled, during which the pressure within the bladder is maintained constant to maintain the compressed air pressure constant.
9. The method of storing gas according to claim 8, wherein the medium is pumped out from between the gas reservoir and the gas bladder and stored in liquefied form when the compressed air assembly stores energy, and wherein the medium is gasified and re-introduced between the gas reservoir and the gas bladder when the compressed air assembly releases energy.
10. A gas storage method, characterized in that a gas storage system according to any one of the preceding claims 5-7 is used, said gas storage method comprising the steps of:
s1: storing compressed air between an air bag and an air reservoir, a medium being stored within the air bag;
s2: liquefying the medium when the compressed air assembly stores energy to compress the air bag so as to store the compressed air between the air storage and the air bag, and keeping the pressure between the air storage and the air bag constant so as to keep the pressure of the compressed air constant;
s3: and gasifying the medium when the compressed air assembly releases energy to expand the air bag so as to discharge the compressed air between the air storage and the air bag, and keeping the pressure between the air storage and the air bag constant so as to keep the pressure of the compressed air constant.
11. The method of storing gas according to claim 10 wherein said medium is withdrawn from said bladder and stored in liquefied form when said compressed air assembly is stored energy, and wherein said medium is gasified and re-introduced into said bladder when said compressed air assembly is released.
12. A method of storing gas according to claim 8 or claim 10 wherein, when the compressed air assembly stores energy, the medium converts electrical energy into pressure potential energy of the medium and heat of the medium by compression by a third compressor to effect additional energy storage, when the compressed air assembly releases energy, the medium generates electricity by a gas expander to convert pressure potential energy of the medium and heat of the medium into electrical energy to effect additional energy release, and heat in the medium is collected by the first or second heat storage.
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