CN114718686B - Low-pressure-difference sealed gravity compressed air energy storage system and method - Google Patents
Low-pressure-difference sealed gravity compressed air energy storage system and method Download PDFInfo
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- CN114718686B CN114718686B CN202210641719.8A CN202210641719A CN114718686B CN 114718686 B CN114718686 B CN 114718686B CN 202210641719 A CN202210641719 A CN 202210641719A CN 114718686 B CN114718686 B CN 114718686B
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- plunger
- compressed air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- 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
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G3/00—Other motors, e.g. gravity or inertia motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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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
Abstract
The application provides a low-pressure-difference sealed gravity compressed air energy storage system and a method, wherein the energy storage system comprises a vertical shaft and a sealing film, a gravity plunger is movably inserted into the vertical shaft, and a gap is reserved between the vertical shaft and the gravity plunger; the seal membrane is located in the clearance, the seal membrane with the shaft with sealing connection between the gravity plunger makes the gravity plunger the seal membrane with the shaft is located enclose into the gas storage chamber between the space of seal membrane below for save compressed air, the seal membrane the gravity plunger with the shaft is located enclose between the space of seal membrane top and become the regulation chamber, it has pressure fluid to let in the regulation chamber, pressure fluid is right the inside and outside pressure differential of seal membrane can be reduced to the pressure effect of pressure fluid to the seal membrane through injecting pressure fluid in the regulation chamber of seal membrane top, thereby reduces the seal membrane stress, improves the seal membrane life-span, reduces the seal membrane cost.
Description
Technical Field
The application relates to the technical field of electric energy storage, in particular to a low-pressure-difference sealed gravity compressed air energy storage system and method.
Background
The air storage chamber core of gravity compressed air energy storage is the air storage chamber seal membrane, and among the current engineering scheme, uses cartridge type seal membrane one side to connect at the shaft wall, and the opposite side anchor forms arch seal structure on the pouring weight. At this time, the outside of the sealing film is at normal atmospheric pressure, and the inside of the sealing film is at high pressure, so that the sealing film is subjected to high-strength tensile stress, and the service life of the sealing film is shortened.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the purpose of the application is to provide a low-pressure-difference sealed gravity compressed air energy storage system, pressure liquid is injected into a regulating cavity above a sealing film, the pressure of the pressure liquid on the sealing film can reduce the pressure difference between the inside and the outside of the sealing film, so that the stress of the sealing film is reduced, the service life of the sealing film is prolonged, and the cost of the sealing film is reduced.
In order to achieve the above object, the present application provides a low-pressure-difference sealed gravity compressed air energy storage system, including:
the device comprises a vertical shaft, a gravity plunger piston is movably inserted in the vertical shaft, and a gap is reserved between the vertical shaft and the gravity plunger piston;
the sealing membrane is located in the gap, the sealing membrane is connected with the vertical shaft and the gravity plunger in a sealing mode, so that a gas storage cavity is formed by the gravity plunger, the sealing membrane and the space, below the sealing membrane, of the vertical shaft in a surrounding mode, the gas storage cavity is used for storing compressed air, an adjusting cavity is formed by the sealing membrane, the gravity plunger and the space, above the sealing membrane, of the vertical shaft in a surrounding mode, pressure liquid is introduced into the adjusting cavity, and the pressure liquid has downward pressure on the sealing membrane.
Further, the sealing diaphragm sealing device further comprises a pressure liquid storage device, and the pressure liquid storage device is connected with the adjusting cavity, so that when the pressure of compressed air in the air storage cavity is increased, pressure liquid is introduced into the adjusting cavity through the pressure liquid storage device to reduce the pressure difference of the sealing diaphragm.
Furthermore, the sealing film is of a cylindrical structure and comprises a plurality of supporting ribs, the supporting ribs surround the periphery of the cylindrical structure, and two adjacent supporting ribs are connected through the elastic sealing film so as to form the cylindrical structure through the supporting ribs and the elastic sealing film;
the top end of the sealing membrane is bent inwards to form an inner ring and an outer ring, the inner ring is connected with the top end of the outer ring, the bottom end of the inner ring is connected to the outer wall of the gravity plunger in a sealing mode, and the bottom end of the outer ring is connected to the inner wall of the vertical shaft.
Further, the outer diameter of the outer ring is the same as the inner diameter of the shaft, so that the support ribs and the elastic sealing membrane of the outer ring are connected with the inner wall of the shaft;
and the supporting ribs of the inner ring are connected with the outer wall of the gravity plunger.
Further, a locking assembly is arranged at the top end of the gravity plunger, so that the gravity plunger moving downwards is supported on the ground at the top of the vertical shaft through the locking assembly, and a certain space is reserved in the air storage cavity when the gravity plunger is at the lowest limit position;
and an overground gravity component is arranged at the top of the gravity plunger, and is positioned outside the vertical shaft.
Furthermore, the overground gravity assembly comprises a supporting platform and a plurality of gravity block groups arranged on the supporting platform, the supporting platform is fixed to the top of the gravity plunger, and the gravity block groups are distributed on the periphery of the gravity plunger at equal angles so as to apply downward acting force to the gravity plunger through the supporting platform and the gravity block groups.
Furthermore, the device also comprises a plurality of first guide rails, wherein the first guide rails are distributed on the periphery side of the support table;
supporting bench week side be provided with first guide assembly of first guide rail complex is in order to pass through first guide rail is right supporting bench with the gravity plunger carries on spacingly.
Further, the gravity block group comprises a plurality of overground gravity blocks which are arranged in a superposed manner;
the supporting platform is provided with a plurality of second guide rails on the periphery of the gravity block groups, the plurality of overground gravity blocks are connected, and a second guide assembly matched with the second guide rails is arranged on the outer wall of the overground gravity block at the topmost end, so that the plurality of overground gravity blocks on each gravity block group are limited through the second guide rails.
Further, the gravity plunger comprises a pressure bearing cylinder and a plurality of filling gravity blocks which are filled in the pressure bearing cylinder and are arranged in a stacked mode;
the locking assembly is arranged at the top end of the pressure bearing cylinder;
the bearing cylinder is characterized in that a plurality of positioning guide grooves in the axial direction are formed in the inner wall of the bearing cylinder, and positioning blocks matched with the positioning guide grooves are arranged on the outer wall of the filling gravity block, so that the gravity center of the filling gravity block is positioned on the axis of the bearing cylinder through the limiting effect of the positioning guide grooves.
A low-pressure-difference sealed gravity compressed air energy storage method comprises the following steps:
sealing a sealing film between a gravity plunger and a vertical shaft, so that a gas storage cavity is enclosed among spaces of the gravity plunger, the sealing film and the vertical shaft below the sealing film, and an adjusting cavity is enclosed among the spaces of the sealing film, the gravity plunger and the vertical shaft above the sealing film;
when energy is stored, the motor drives the air compressor unit to do work, compressed air obtained by doing work is introduced into the air storage cavity, the air pressure in the air storage cavity is gradually increased, meanwhile, pressure liquid is introduced into the adjusting cavity, the amount of the introduced pressure liquid is increased while the pressure in the air storage cavity is increased, the internal and external pressure difference of the sealing film is kept, and when the pressure in the air storage cavity is increased to a target pressure, the gravity plunger is pushed to move upwards to a highest limit position to stop;
when the energy is released, the high-pressure air in the air storage cavity applies work to the air expansion unit to drive the motor to generate electricity, the gravity plunger moves downwards, the air storage amount in the air storage cavity is reduced, the gravity plunger starts to descend, when the gravity plunger descends to the lowest point, the air pressure in the air storage cavity starts to be reduced, and meanwhile, the pressure liquid is controlled to be discharged.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a low-pressure-difference sealed gravity compressed air energy storage system according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a low differential pressure sealed gravity compressed air energy storage system according to another embodiment of the present application;
FIG. 3 is a schematic structural view of a sealing film according to another embodiment of the present application;
FIG. 4 is a schematic structural diagram of a low differential pressure sealed gravity compressed air energy storage system according to another embodiment of the present application;
FIG. 5 is a schematic structural diagram of a low differential pressure sealed gravity compressed air energy storage system according to another embodiment of the present application;
FIG. 6 is a partial schematic structural view of FIG. 5 of the present application;
FIG. 7 is a schematic structural diagram of a low differential pressure sealed gravity compressed air energy storage system according to another embodiment of the present application;
in the figure: 1. a shaft; 2. a gravity plunger; 201. a locking assembly; 202. a pressure-bearing cylinder; 203. filling a gravity block; 204. positioning the guide groove; 205. a support ring; 3. a sealing film; 301. supporting ribs; 302. an elastic sealing film; 4. a gas storage cavity; 5. an adjustment chamber; 501. a pressure fluid; 6. a pressure fluid storage device; 601. a liquid inlet pipeline; 602. a liquid feeding pump; 603. a liquid outlet pipeline; 604. a liquid discharge pump; 7. an above-ground gravity assembly; 701. a support table; 702. a gravity block set; 703. an above-ground gravity block; 8. a first guide rail; 9. a second guide rail; 10. an air compressor unit; 11. an air expander assembly.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the application include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Fig. 1 is a schematic structural diagram of a low-pressure-difference sealed gravity compressed air energy storage system according to an embodiment of the present application.
Referring to fig. 1, a low-pressure-difference sealed gravity compressed air energy storage system comprises a vertical shaft 1, a gravity plunger 2 is movably inserted in the vertical shaft 1, a gap is formed between the vertical shaft 1 and the gravity plunger 2, a sealing film 3 is arranged in the gap, the sealing film 3 is hermetically connected with the vertical shaft 1 and the gravity plunger 2, so that a gas storage cavity 4 is defined by the gravity plunger 2, the sealing film 3 and a space of the vertical shaft 1 below the sealing film 3, the gas storage cavity 4 is used for storing compressed air, an adjusting cavity 5 is defined by the sealing film 3, the gravity plunger 2 and a space of the vertical shaft 1 above the sealing film 3, a pressure liquid 501 is introduced into the adjusting cavity 5, the pressure liquid 501 has downward pressure on the sealing film 3, the compressed air in the gas storage cavity 4 has larger pressure on the sealing film 3, the pressure difference between the upper part and the lower part of the sealing film 3 can be reduced by the downward acting force of the pressure liquid 501, and further the tensile stress is reduced, thereby reducing the cost of the composite material and prolonging the service life of the sealing material of the gas storage cavity 4.
As shown in fig. 2, in some embodiments, the sealing device further comprises a pressure liquid storage device 6, the pressure liquid storage device 6 is connected to the adjustment chamber 5, so that when the pressure of the compressed air in the air storage chamber 4 is increased, a pressure liquid 501 is introduced into the adjustment chamber 5 through the pressure liquid storage device to reduce the pressure difference of the sealing membrane 3, wherein a liquid inlet pipe 601 is connected to the bottom of the pressure liquid storage device 6, one end of the liquid inlet pipe 601 is connected to the shaft 1 and is communicated with the adjustment chamber 5, a liquid inlet valve and a liquid feeding pump 602 are arranged on the liquid inlet pipe 601, a liquid outlet pipe 603 is connected to the top of the pressure liquid storage device 6, one end of the liquid outlet pipe 603 is connected to the shaft 1, the liquid outlet pipe 603 is communicated with the adjustment chamber 5, a liquid inlet of the liquid outlet pipe 603 is arranged close to the sealing membrane 3, so that the pressure liquid 501 above the sealing membrane 3 can conveniently enter the liquid outlet pipe 603, and a liquid outlet valve and a liquid discharge pump 604 are arranged on the liquid outlet pipe 603, make and let in compressed air in the gas storage chamber 4, to the ascending pressure increase of sealing membrane 3 when causing pressure increase in the gas storage chamber 4, through letting in pressure liquid 501 in adjusting the chamber 5, pressure liquid 501 is to the decurrent pressure of sealing membrane 3, and then can effectual reduction the upper and lower pressure difference that sealing membrane 3 received.
Referring to fig. 3, in some embodiments, the sealing membrane 3 is a tubular structure, the sealing membrane 3 includes a plurality of support ribs 301, the plurality of support ribs 301 surround the periphery of the tubular structure, two adjacent support ribs 301 are connected by an elastic sealing membrane 302 to form the tubular structure by the plurality of support ribs 301 and the elastic sealing membrane 302, the tensile strength of the sealing membrane in the longitudinal direction can be improved by the support ribs 301, and when the air storage chamber 4 is inflated at constant pressure, the elastic region of the elastic sealing membrane 302 of the sealing membrane 3 bulges to the low pressure side to be attached to the wall surface of the shaft 1 and the gravity plunger 2 to provide reverse supporting force to reduce the circumferential tensile force of the sealing membrane, in addition, when the gravity plunger 2 moves to different heights, the bending position of the sealing membrane 3 causes the self-extrusion deformation of the sealing membrane 3, which reduces the service life of the sealing membrane 3 and needs to improve the performance of the material of the sealing membrane 3, and then can increase cost, can provide the inside deformation allowance of seal membrane 3 through the setting of seal membrane 3 between two adjacent brace rods 301, reduce the 3 internal stress of seal membrane that deformation produced, improve 3 life of seal membrane, reduce 3 material cost of seal membrane.
In addition, the top end of the sealing membrane 3 is bent inwards to form an inner ring and an outer ring, the inner ring is connected with the top end of the outer ring, the bottom end of the inner ring is hermetically connected to the outer wall of the gravity plunger 2, the bottom end of the outer ring is connected to the inner wall of the shaft 1, the outer diameter of the outer ring is the same as the inner diameter of the shaft 1, so that the supporting rib 301 and the elastic sealing membrane 302 of the outer ring are connected with the inner wall of the shaft 1, the supporting rib 301 of the inner ring is connected with the outer wall of the gravity plunger 2, when the air storage cavity 4 is inflated, the elastic sealing membrane 302 bulges towards the low-pressure side under the action of pressure, and further the elastic sealing membrane 302 can be connected with the outer wall of the gravity plunger 2. Simultaneously, when the seal membrane 3 bends and forms inner ring and outer loop, the inner ring week side after rolling over forms the fold, extrudees each other between the fold, can produce self extrusion deformation, produces internal stress, influences the life of seal membrane 3, through setting up brace rod 301, through the fixed of brace rod 301 for elasticity seal membrane 302 fold is protruding back, and the interval through brace rod 301 can not produce extrusion and internal stress between two adjacent fold archs, thereby reduces the 3 material cost of seal membrane.
As shown in fig. 4, in some embodiments, the top end of the gravity plunger 2 is provided with a locking assembly 201 to support the downward-moving gravity plunger 2 on the ground at the top of the shaft 1 through the locking assembly 201, so that when the gravity plunger 2 is at the lowest limit position, there is a certain space in the air storage chamber 4, and the compressed air contained in the air storage chamber 4 has enough pressure to jack up the gravity plunger 2 in the initial stage, thereby realizing the start of the gravity plunger 2.
In addition, the overground gravity component 7 can be arranged at the top of the gravity plunger 2, namely, the gravity part is divided into two parts, the gravity plunger 2 arranged underground and the overground gravity component 7 arranged on the ground can provide gravity, so that more energy can be stored, and the overground gravity component 7 is directly arranged outside the vertical shaft 1, so that when large energy storage is realized, all gravity parts do not need to be concentrated in the vertical shaft 1, the height of the vertical shaft 1 can be reduced, and the excavation engineering quantity and the engineering difficulty of the vertical shaft 1 are greatly reduced.
As shown in fig. 5 and 6, in some embodiments, the above-ground gravity assembly 7 includes a support base 701 and a plurality of gravity block groups 702 disposed on the support base 701, the plurality of gravity block groups 702 are equiangularly distributed on the periphery of the gravity plunger 2, the support base 701 is disposed on the top of the gravity plunger 2 to apply a downward force to the gravity plunger 2 through the support base 701 and the plurality of gravity block groups 702, that is, when the plurality of identical gravity block groups 702 are equiangularly distributed on the periphery of the gravity plunger 2, since the gravity plunger 2 has a cylindrical structure, the axis of the cylindrical structure surrounded by the plurality of gravity block groups 702 coincides with the axis of the gravity plunger 2, and the center of gravity of the support base 701 is secured on the axis of the gravity plunger 2, so that the center of gravity of the entire above-ground gravity assembly 7 is on the axis of the gravity plunger 2, by dividing the above-ground gravity assembly 7 into the support base 701 and the plurality of gravity block groups 702 dispersedly disposed on the support base 701, the problems that when the overground gravity assembly 7 with certain gravity requirements is used, the plurality of gravity block groups 702 are directly applied to the upper side of the supporting table 701 in an upwards stacking mode, the stacking height is high, and the construction difficulty and risk are increased are solved.
In some embodiments, the multiple first guide rails 8 are further included, the multiple first guide rails 8 are distributed on the periphery of the support table 701, a first guide assembly matched with the first guide rails 8 is arranged on the periphery of the support table 701 to limit the support table 701 and the gravity plunger 2 through the first guide rails 8, so that the support table 701 and the gravity plunger 2 cannot incline in the up-and-down moving process, the number of the first guide rails 8 can be 4, the 4 first guide rails 8 are distributed on the periphery of the support table 701 at equal angles, a plurality of welltowers are arranged on the ground at the top of the shaft 1, and the first guide rails 8 are installed on the welltowers.
It should be noted that the structure of each gravity block set 702 may be varied.
As a possible structure, each gravity block group 702 may include a plurality of superposed above-ground gravity blocks 703, and the gravity block group 702 is configured as a plurality of superposed above-ground gravity blocks 703, so that the weight of each hoisting during the hoisting in the construction is reduced, and the hoisting construction is facilitated. A plurality of second guide rails 9 are arranged on the supporting table 701 and around the gravity block groups 702, a plurality of pylons are arranged on each gravity block group 702 on the supporting table 701, the plurality of above-ground gravity blocks 703 are connected with each other, a second guide assembly matched with the second guide rails 9 is arranged on the outer wall of the above-ground gravity block 703 at the topmost end, so that the plurality of above-ground gravity blocks 703 on each gravity block group 702 are limited by the second guide rails 9, the gravity centers of the plurality of above-ground gravity blocks 703 are concentrated on the cylindrical axis surrounded by the plurality of second guide rails 9 after being installed, the gravity centers of the plurality of gravity block groups 702 can be controlled to be uniformly distributed on the periphery of the gravity plunger 2, the periphery of the gravity plunger 2 is uniformly stressed, namely, the plurality of above-ground gravity blocks 703 can be tightened by bolts, the horizontal level between the blocks needs to be adjusted, and then a second guide assembly is installed on the side wall of the one above-ground gravity block 703 at the topmost layer, so that the weight block set 702 does not shift during up and down movement, wherein the first and second guide assemblies may be configured as roller ears.
As shown in fig. 7, in some embodiments, the gravity plunger 2 includes a pressure-bearing cylinder 202 and a plurality of stacked gravity-filled blocks 203 filled in the pressure-bearing cylinder 202, the locking assembly 201 is disposed at the top end of the pressure-bearing cylinder 202, the locking assembly 201 may be a flange for locking, the outer diameter of the flange for locking is greater than the inner diameter of the pressure-bearing cylinder 202, a plurality of positioning guide grooves 204 are disposed on the inner wall of the pressure-bearing cylinder 202 along the axial direction, and a positioning block is disposed on the outer wall of the gravity-filled block 203 and cooperates with the positioning guide grooves 204 to make the centers of gravity of the plurality of gravity-filled blocks 203 on the axis of the pressure-bearing cylinder 202 by the limiting effect of the positioning guide grooves 204, so as to prevent the gravity-filled blocks 203 from shifting centers during the up and down movement of the gravity plunger 2, which results in the center shifting of the entire gravity plunger 2.
In detail, the bearing cylinder 202 can be the tubular structure that the steel sheet encloses, the surface is more smooth, in addition, the steel lining also can be fixed to the inner wall of shaft 1, seal membrane 3 is connected on steel lining inner wall and bearing cylinder 202 outer wall, can ensure the shaft inner wall to be smooth wall through setting up the steel lining, and then when realizing that seal membrane 3 fixes on the steel lining and on bearing cylinder 202, can improve sealing performance, in addition with bearing cylinder 202 inside be hollow structure, weight reduction, be convenient for hoist and mount, hoist and mount to block the back through locking Assembly 201 in the shaft 1, then to bearing cylinder 202 in the piecemeal hoist and mount a plurality of gravity blocks 203 of packing, through the piece hoist and mount, the weight of the gravity block 203 of packing of hoist at every turn has been reduced, can reduce the hoist and mount degree of difficulty. In addition, because energy storage pressure is great in the gas storage chamber 4, and the gravity piece generally all is with concrete preparation, the condition that can appear leaking gas under the highly-compressed air effect through setting up the barrel 202 cladding of bearing outside at a plurality of gravity pieces of packing 203, can improve the gas tightness, prevents to leak gas, and then guarantees the sealing characteristic of gas storage chamber 4, can bear higher pressure, the energy density of lift system energy storage.
In addition, it should be noted that, a plurality of support rings 205 may be provided on the inner wall of the pressure-bearing cylinder 202 along the axial direction, the plurality of support rings 205 are provided coaxially with the pressure-bearing cylinder 202, and since the pressure-bearing cylinder 202 has a cylindrical hollow structure, the performance strength of the pressure-bearing cylinder 202 can be improved by the action of the plurality of support rings 205, and then the positioning guide grooves 204 may be provided on the support rings 205.
In some embodiments, the energy storage device further comprises an air compressor unit 10 and an air expander unit 11, the air compressor unit 10 and the air expander unit 11 are both connected with the air storage cavity 4, surplus electric power drives the air compressor unit 10 to do work on gas through a motor, the obtained compressed air is introduced into the air storage cavity 4, the pressure bearing cylinder 202 is driven to move upwards through the compressed air pressure, energy storage is achieved, and when energy is released, the compressed air in the air storage cavity 4 is introduced into the air expander unit 11 to do work and is converted into electric energy.
A low-pressure-difference sealed gravity compressed air energy storage method comprises the following steps:
a sealing film 3 is hermetically arranged between the gravity plunger 2 and the vertical shaft 1, so that a gas storage cavity 4 is defined among spaces of the gravity plunger 2, the sealing film 3 and the vertical shaft 1 below the sealing film 3, and an adjusting cavity 5 is defined among spaces of the sealing film 3, the gravity plunger 2 and the vertical shaft 1 above the sealing film 3;
during energy storage, the air compressor unit 10 is driven by the motor to do work, compressed air obtained by the work is introduced into the air storage cavity 4, the air pressure in the air storage cavity 4 is gradually increased, meanwhile, the pressure liquid 501 is introduced into the adjusting cavity 5, the amount of the introduced pressure liquid 501 is increased while the pressure in the air storage cavity 4 is increased, the internal and external pressure difference of the sealing film 3 is kept, and when the pressure in the air storage cavity 4 is increased to a target pressure, the gravity plunger 2 is pushed to move upwards to a highest limit position to stop;
when energy is released, high-pressure air in the air storage cavity 4 applies work to the air expansion unit 11 to drive the motor to generate electricity, the gravity plunger 2 moves downwards, the air storage amount in the air storage cavity 4 is reduced, the gravity plunger 2 begins to descend, when the gravity plunger 2 descends to the lowest point, the air pressure in the air storage cavity 4 begins to be reduced, the liquid discharge pump 604 is opened, pressure liquid 501 is controlled to be discharged, the liquid level of the pressure liquid 501 is reduced, and when the air pressure in the air storage cavity 4 is reduced to normal pressure, the internal and external pressure difference of the sealing film 3 is kept fixed.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means 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 application. In this specification, the schematic representations of the terms used above do not necessarily refer 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.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (9)
1. A low differential pressure sealed gravity compressed air energy storage system, comprising:
the device comprises a vertical shaft, a gravity plunger piston is movably inserted in the vertical shaft, and a gap is reserved between the vertical shaft and the gravity plunger piston;
the sealing membrane is positioned in the gap and is in sealing connection with the vertical shaft and the gravity plunger, so that a gas storage cavity is formed by the gravity plunger, the sealing membrane and a space of the vertical shaft below the sealing membrane in a surrounding manner, the gas storage cavity is used for storing compressed air, an adjusting cavity is formed by the sealing membrane, the gravity plunger and a space of the vertical shaft above the sealing membrane in a surrounding manner, pressure liquid is introduced into the adjusting cavity, and the pressure liquid has downward pressure on the sealing membrane; the sealing film is of a cylindrical structure and comprises a plurality of supporting ribs, the supporting ribs surround the periphery of the cylindrical structure, and two adjacent supporting ribs are connected through an elastic sealing film so as to form the cylindrical structure through the supporting ribs and the elastic sealing film; the top end of the sealing membrane is bent inwards to form an inner ring and an outer ring, the inner ring is connected with the top end of the outer ring, the bottom end of the inner ring is connected to the outer wall of the gravity plunger in a sealing mode, and the bottom end of the outer ring is connected to the inner wall of the vertical shaft.
2. The low differential pressure sealed gravity compressed air energy storage system according to claim 1, further comprising a pressure fluid storage device connected to said regulated chamber such that when the pressure of the compressed air in said air storage chamber increases, pressure fluid is introduced into said regulated chamber through said pressure fluid storage device to reduce the differential pressure of said sealing diaphragm.
3. The low differential pressure sealed gravity compressed air energy storage system of claim 1, wherein the outer diameter of said outer ring is the same as the inner diameter of said shaft such that the support ribs and the elastic sealing membrane of said outer ring are in contact with the inner wall of said shaft;
and the supporting ribs of the inner ring are connected with the outer wall of the gravity plunger.
4. A low differential pressure sealed gravity compressed air energy storage system according to claim 1 wherein the top end of said gravity plunger is provided with a locking assembly to support said gravity plunger moving downwardly on the ground at the top of said shaft by said locking assembly such that there is space in said air reservoir when said gravity plunger is at a bottom most limit;
and an overground gravity component is arranged at the top of the gravity plunger and is positioned outside the vertical shaft.
5. The low differential pressure sealed gravity compressed air energy storage system of claim 4, wherein said above-ground gravity assembly comprises a support platform and a plurality of gravity block sets disposed on said support platform, said support platform being affixed to the top of said gravity plunger, said plurality of gravity block sets being equiangularly distributed around the periphery of said gravity plunger.
6. The low differential pressure sealed gravity compressed air energy storage system of claim 5, further comprising a plurality of first guide rails, said plurality of first guide rails being distributed around said support table;
supporting bench week side be provided with first guide assembly of first guide rail complex is in order to pass through first guide rail is right supporting bench with the gravity plunger carries on spacingly.
7. The low differential pressure sealed gravity compressed air energy storage system of claim 6, wherein the gravity block set comprises a plurality of above-ground gravity blocks arranged in a stacked arrangement;
the supporting platform is provided with a plurality of second guide rails on the periphery of the gravity block groups, the plurality of overground gravity blocks are connected, and a second guide assembly matched with the second guide rails is arranged on the outer wall of the overground gravity block at the topmost end, so that the plurality of overground gravity blocks on each gravity block group are limited through the second guide rails.
8. The low differential pressure sealed gravity compressed air energy storage system of claim 4, wherein the gravity plunger comprises a pressure bearing cylinder and a plurality of stacked gravity-filled blocks filled in the pressure bearing cylinder;
the locking assembly is arranged at the top end of the pressure bearing cylinder;
the bearing cylinder is characterized in that a plurality of positioning guide grooves in the axial direction are formed in the inner wall of the bearing cylinder, and positioning blocks matched with the positioning guide grooves are arranged on the outer wall of the filling gravity block, so that the gravity center of the filling gravity block is positioned on the axis of the bearing cylinder through the limiting effect of the positioning guide grooves.
9. An energy storage method based on the low-pressure-difference sealed gravity compressed air energy storage system of any one of claims 1 to 8, characterized by comprising the following steps:
the sealing membrane is hermetically arranged between the gravity plunger and the vertical shaft, so that a gas storage cavity is defined by the gravity plunger, the sealing membrane and a space of the vertical shaft below the sealing membrane, and an adjusting cavity is defined by the sealing membrane, the gravity plunger and a space of the vertical shaft above the sealing membrane;
when energy is stored, the motor drives the air compressor unit to do work, compressed air obtained by doing work is introduced into the air storage cavity, the air pressure in the air storage cavity is gradually increased, meanwhile, pressure liquid is introduced into the adjusting cavity, the amount of the introduced pressure liquid is increased while the pressure in the air storage cavity is increased, the internal and external pressure difference of the sealing film is kept, and when the pressure in the air storage cavity is increased to a target pressure, the gravity plunger is pushed to move upwards to a highest limit position to stop;
when the energy is released, the high-pressure air in the air storage cavity applies work to the air expansion unit to drive the motor to generate electricity, the gravity plunger moves downwards, the air storage amount in the air storage cavity is reduced, the gravity plunger starts to descend, when the gravity plunger descends to the lowest point, the air pressure in the air storage cavity starts to be reduced, and meanwhile, the pressure liquid is controlled to be discharged.
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| US11815071B1 (en) * | 2022-06-08 | 2023-11-14 | Xi'an Thermal Power Research Institute Co., Ltd | Gravity compressed air energy storage system |
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| CN116877220B (en) * | 2023-09-04 | 2023-11-07 | 九州绿能科技股份有限公司 | Liquid-pumping energy-storage power generation system and energy-storage power generation method |
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