CN114914917B - Gravity energy storage system and method - Google Patents
Gravity energy storage system and method Download PDFInfo
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- CN114914917B CN114914917B CN202210461544.2A CN202210461544A CN114914917B CN 114914917 B CN114914917 B CN 114914917B CN 202210461544 A CN202210461544 A CN 202210461544A CN 114914917 B CN114914917 B CN 114914917B
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- baffle door
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- 230000005484 gravity Effects 0.000 title claims abstract description 120
- 238000004146 energy storage Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000007789 sealing Methods 0.000 claims abstract description 210
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 166
- 238000005192 partition Methods 0.000 claims abstract description 125
- 238000004891 communication Methods 0.000 claims abstract description 45
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 description 12
- 238000010248 power generation Methods 0.000 description 9
- 238000007599 discharging Methods 0.000 description 4
- 238000005381 potential energy Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/003—Systems for storing electric energy in the form of hydraulic energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/006—Systems for storing electric energy in the form of pneumatic energy, e.g. compressed air energy storage [CAES]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2220/00—Application
- F05B2220/70—Application in combination with
- F05B2220/706—Application in combination with an electrical generator
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention discloses a gravity energy storage system and a method.A movable partition board is arranged in a water tank, a first sealing structure and a second sealing structure are arranged on the water tank, and a first deformable partition layer and a second deformable partition layer are respectively arranged in a first chamber and a second chamber; the first chamber and the second chamber are respectively provided with a first air discharge port and a second air discharge port at positions above the first separation layer and the second separation layer; the lower end of the water tank is respectively communicated with a first gravity vertical shaft and a second gravity vertical shaft through a first communication channel and a second communication channel, a first gravity pressing block and a second gravity pressing block are respectively arranged in the first gravity vertical shaft and the second gravity vertical shaft, and a first water turbine and a second water turbine are respectively arranged on the first communication channel and the second communication channel; the top of the water tank is sealed and communicated with a compressed air outlet of the air compression device, and a pressure balance structure is arranged on the movable partition plate. The invention can meet the requirements of high energy storage efficiency and wide application range of compressed air. The problems existing in the prior compressed air can be thoroughly solved, and the compressed air is combined with pumped storage, so that the energy storage system is efficient and stable.
Description
Technical Field
The invention belongs to the field of physical energy storage, and relates to a gravity energy storage system and a gravity energy storage method.
Background
The renewable energy power generation technologies such as wind energy and solar energy have the problems of intermittence and fluctuation, and with the increase of the installed proportion of wind energy and solar energy and the increase of the traditional power peak Gu Chazhi, partial areas are provided with 'abandoned wind' and 'abandoned light'. The effective method for solving the problem is to adopt an electric power energy storage system, and smooth the output of renewable energy power generation and peak clipping and valley filling by using the electric power energy storage system. The compressed air energy storage system is an energy storage system which converts electric energy into air pressure potential energy to be stored in the electricity consumption valley period and uses aerodynamic energy to push the expander to generate electricity in the electricity consumption peak period. The compressed air energy storage system can build a large-scale power station with the installed power of more than 100MW, which is inferior to a pumped storage power station, and has the advantages of long energy storage period, small unit energy storage investment, long service life and high efficiency. The traditional compressed air energy storage system uses rock caverns, abandoned salt caverns, abandoned mines and the like as gas storage devices, has high dependence on the geographic environment, and needs to consume fossil energy sources such as natural gas and the like in the power generation process. And the traditional compressed air energy storage system cannot store energy with different pressure levels during energy storage, and the stored energy is limited in the aspect of flexibility of use.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a gravity energy storage system and a gravity energy storage method, which can store energy at different pressure levels during energy storage, meet the energy consumption requirements at different pressure levels and have higher flexibility.
The technical scheme adopted by the invention is as follows:
The gravity energy storage system comprises a water tank, a first gravity vertical shaft, a second gravity vertical shaft, a movable partition plate and an air compression device, wherein the movable partition plate is arranged in the water tank, the side edge and the bottom of the movable partition plate are in sealing connection with the water tank and can relatively move, a driving mechanism for driving the movable partition plate to move is connected to the movable partition plate, a preset distance is reserved between the top of the movable partition plate and the top of the water tank, chambers positioned on two sides of the movable partition plate in the water tank are respectively a first chamber and a second chamber, and a first sealing structure capable of switching off the first sealing chamber and a second sealing structure capable of switching off the second chamber are respectively arranged on two sides of the upper end of the movable partition plate in the water tank; a deformable first separation layer and a deformable second separation layer for separating air and water interfaces are respectively arranged in the first chamber and the second chamber; the first chamber and the second chamber are respectively provided with a first air discharge port and a second air discharge port at positions above the first separation layer and the second separation layer;
The lower end of the water tank is respectively communicated with a first gravity vertical shaft and a second gravity vertical shaft through a first communication channel and a second communication channel, a first gravity pressing block and a second gravity pressing block are respectively arranged in the first gravity vertical shaft and the second gravity vertical shaft, and a first water turbine is arranged on the first communication channel; the second water turbine is arranged on the second communication channel;
The top of the water tank is sealed and communicated with a compressed air outlet of the air compression device, and a pressure balancing structure for balancing the water pressure between the first chamber and the second chamber is arranged on the movable partition plate.
Preferably, the pressure balancing structure comprises a pressure balancing sealing baffle door, a driving motor, a driving screw and a pressure balancing port arranged on the movable partition plate, wherein the pressure balancing port is positioned below the liquid level of the first chamber and the second chamber, and the pressure balancing port can be used for mutually communicating the first chamber and the second chamber; a containing cavity for placing a pressure balance sealing baffle door is arranged above the pressure balance opening in the movable partition, a driving motor is arranged at the top of the movable partition, a driving screw is arranged in the movable partition, the upper end of the driving screw is connected with an output shaft of the driving motor, the lower end of the driving screw is in threaded connection with the pressure balance sealing baffle door, and a threaded hole matched and connected with the driving screw is formed in the pressure balance sealing baffle door; the driving screw can drive the pressure balance sealing baffle door to move downwards along the accommodating cavity and balance the pressure.
Preferably, the outer edge of the movable partition plate is provided with a sealing ring, and the movable partition plate is in sealing connection with the water tank through the sealing ring.
Preferably, the driving mechanism of the movable partition plate adopts a screw-nut mechanism, the screw-nut mechanism comprises a screw and a nut which is matched and connected with the screw, the nut is fixedly connected with the water tank, one end of the screw is connected with a screw driving mechanism, and the other end of the screw extends into the water tank and is rotationally connected with the movable partition plate.
Preferably, the first sealing structure adopts a first telescopic sealing baffle door, the first telescopic sealing baffle door is arranged on the water tank, one end of the first telescopic sealing baffle door is connected with a first baffle door driving mechanism, one end of the first telescopic sealing baffle door can extend into the first cavity and is in sealing connection with the movable partition plate and the water tank, the upper end of the first cavity is sealed, and the first baffle door driving mechanism can drive the first telescopic sealing baffle door to extend into the first cavity or withdraw from the first cavity;
The second sealing structure adopts a second telescopic sealing baffle door, the second telescopic sealing baffle door is arranged on the water tank, one end of the second telescopic sealing baffle door is connected with a second baffle door driving mechanism, one end of the second telescopic sealing baffle door can extend into the second cavity and is in sealing connection with the movable partition plate and the water tank, the upper end of the second cavity is sealed, and the second baffle door driving mechanism can drive the second telescopic sealing baffle door to extend into the second cavity or withdraw from the second cavity.
Preferably, the movable partition plate is provided with a groove in which the first retractable sealing baffle door and the second retractable sealing baffle door are embedded, and the groove is provided with a sealing element capable of sealing between the first retractable sealing baffle door and the movable partition plate and a sealing element capable of sealing between the second retractable sealing baffle door and the movable partition plate.
Preferably, the first separation layer and the second separation layer are respectively flexible first deformable rubber film and second deformable rubber film, the edge of the first deformable rubber film is in sealing connection with the water tank and the movable partition plate, and the edge of the second deformable rubber film is in sealing connection with the water tank and the movable partition plate.
Preferably, the first air-sealing baffle door for switching off or switching on the first air-discharging opening is arranged at the first air-discharging opening, the second air-sealing baffle door for switching off or switching on the first air-discharging opening is arranged at the second air-discharging opening, a sealing ring is arranged at the outer edge of the movable partition plate, and the movable partition plate is in sealing connection with the water tank through the sealing ring.
Preferably, a third sealing structure for closing the first communication channel is arranged on the first communication channel; the second communication channel is provided with a fourth sealing structure for closing the second communication channel; the third sealing structure adopts a first sealing baffle door, and the fourth sealing structure adopts a second sealing baffle door.
Preferably, the first communicating channel and the second communicating channel have the same cross section, the first gravity vertical shaft and the second gravity vertical shaft are the same, and the first gravity pressing block and the second gravity pressing block are the same.
The invention also provides a gravity energy storage method which is carried out by adopting the gravity energy storage system disclosed by the invention and comprises the following steps of:
When the generated energy of the thermal power generating unit is excessive or the electric energy generated by new energy needs to be consumed:
Opening the pressure balance structure to balance the water pressure between the first chamber and the second chamber, adjusting the position of the movable partition plate in the water tank according to a preset pressure level to enable the first chamber and the second chamber to reach a preset flow area, and closing the pressure balance structure after the water pressure between the first chamber and the second chamber is balanced;
Opening the first sealing structure and the second sealing structure, and closing the first air discharge port and the second air discharge port; the air compression device is driven to work by the surplus generated energy of the thermal power generating unit or the electric energy generated by new energy, high-pressure air of the air compression device enters the upper part of the inner cavity of the water tank to compress the liquid level in the first cavity and the liquid level in the second cavity, water in the first cavity flows into the first gravity vertical shaft through the first communication channel and drives the first water turbine to work in the process, and the water entering the first gravity vertical shaft lifts the first gravity pressing block to ascend so as to store energy; the water in the second chamber flows into the second gravity vertical shaft through the second communication channel and drives the second water turbine to work in the process, and the water entering the second gravity vertical shaft lifts the second gravity pressing block to ascend so as to store energy; after the energy storage is finished, the first sealing structure and the second sealing structure are closed, so that the first cavity and the second cavity are sealed;
When grid demand peaks: and opening the first air discharge port and the second air discharge port, and sending high-pressure air of the first chamber and the second chamber out to generate electricity, wherein in the process, water drives the first water turbine and the second water turbine to work.
The invention has the following beneficial effects:
The gravity energy storage system combines the energy storage characteristics of compressed air and pumped storage, so that on one hand, the problems of low energy storage efficiency, dependence on geographical position and the like of the compressed air energy storage are thoroughly solved, on the other hand, the pumped storage is free from the limitation of the geographical position, and the advantage of high efficiency is fully utilized. In the energy storage process, the compressed air and the gravity pressing block are energy storage carriers for storing energy, and in the energy storage process, the hydraulic turbine is pushed to rotate to generate power through water side flow, so that the energy is efficiently utilized. When the energy release process, on one hand, the stored compressed air is sent out from the outside to supply for power generation and application, and in the conveying process, the air constant pressure can be ensured by depending on the pressure of the water side, so that the high efficiency of the air side energy transmission is improved, and on the other hand, the potential energy of the gravity pressing block is converted into the kinetic energy of water to drive the water turbine to rotate for power generation. When compressed air energy with different pressure grades is required to be supplied, the energy storage energy grading can be realized by moving the water tank partition plate, and the energy storage with multiple pressure grades can be realized.
Drawings
FIG. 1 is a schematic diagram of a gravity energy storage system of the present invention;
fig. 2 is a schematic structural view of a movable partition in an embodiment of the present invention.
The hydraulic system comprises a water tank 1, a first gravity vertical shaft 2, a first gravity pressing block 3, a second gravity vertical shaft 4, a second gravity pressing block 5, a first water turbine 6, a first sealing baffle door 7, a second water turbine 8, a second sealing baffle door 9, a movable baffle 10, a driving screw 11, a second deformable rubber film 12, a first deformable rubber film 13, a first air sealing baffle door 14, a first telescopic sealing baffle door 15, a second air sealing baffle door 16, a second telescopic sealing baffle door 17, a first communication channel 18, a second communication channel 19, a first air discharge port 20, a second air discharge port 21, a pressure balancing sealing baffle door 21, a pressure balancing port 22, a containing cavity 23, a driving motor 24 and a driving screw 25.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Referring to fig. 1, the gravity energy storage system of the invention comprises a water tank 1, a first gravity vertical shaft 2, a second gravity vertical shaft 4, a movable partition board 10 and an air compression device, wherein the movable partition board 10 is arranged in the water tank 1, the side edge and the bottom of the movable partition board 10 are in sealing connection with the water tank 1 and can move relatively, a driving mechanism for driving the movable partition board 10 to move is connected to the movable partition board 10, a preset distance is reserved between the top of the movable partition board 10 and the top of the water tank 1, chambers positioned at two sides of the movable partition board 10 in the water tank 1 are respectively a first chamber and a second chamber, and a first sealing structure capable of closing the first sealing chamber and a second sealing structure capable of closing the second chamber are respectively arranged at two sides of the upper end of the movable partition board 10 on the water tank 1; a deformable first separation layer and a deformable second separation layer for separating air and water interfaces are respectively arranged in the first chamber and the second chamber; the first chamber and the second chamber are respectively provided with a first air discharge port 20 and a second air discharge port 21 at positions above the first separation layer and the second separation layer; the lower end of the water tank 1 is respectively communicated with the first gravity vertical shaft 2 and the second gravity vertical shaft 4 through a first communication channel 18 and a second communication channel 19, a first gravity pressing block 3 and a second gravity pressing block 5 are respectively arranged in the first gravity vertical shaft 2 and the second gravity vertical shaft 4, and a first water turbine 6 is arranged on the first communication channel 18; the second water turbine 8 is arranged on the second communication channel 19; the top of the water tank 1 is sealed and communicated with a compressed air outlet of the air compression device, and a pressure balancing structure for balancing the water pressure between the first chamber and the second chamber is arranged on the movable partition plate 10.
The working principle and the working process of the gravity energy storage system are as follows:
When the generated energy of the thermal power generating unit is excessive or the electric energy generated by new energy needs to be consumed:
The pressure balance structure is opened, so that the water pressure between the first chamber and the second chamber is balanced, the position of the movable partition board 10 in the water tank 1 is regulated according to the preset pressure level (the movable partition board 10 can be moved left and right as shown in the figure 1), the first chamber and the second chamber reach the preset flow area, after the water pressure between the first chamber and the second chamber is balanced, the pressure balance structure is closed, and under the condition that the compressed air above the water tank 1 is the same, the resultant force born by the water in the first chamber and the resultant force born by the water in the second chamber are related to the flow area due to the different flow areas of the first chamber and the second chamber, and the larger the flow area is, the larger the resultant force is, so that the energy with different pressure levels can be stored in the first gravity shaft 2 and the second gravity shaft 4;
Opening the first sealing structure and the second sealing structure, and closing the first air discharge port 20 and the second air discharge port 21; the air compression device is driven to work by the surplus generated energy of the thermal power generating unit or the electric energy generated by new energy, high-pressure air of the air compression device enters the upper part of the inner cavity of the water tank 1 to compress the liquid level in the first cavity and the second cavity, and the first cavity and the second cavity are internally provided with a first separation layer and a second separation layer which can isolate the compressed air from water and prevent the air from being dissolved in the water; the water in the first chamber flows into the first gravity vertical shaft 2 through the first communication channel 18 and drives the first water turbine 6 to work in the process, so that power generation can be performed, and the water entering the first gravity vertical shaft 2 lifts the first gravity pressing block 2 to store energy; the water in the second chamber flows into the second gravity vertical shaft 4 through the second communication channel 19 and drives the second water turbine 8 to work in the process, so that power generation can be performed, and the water entering the second gravity vertical shaft 4 lifts the second gravity pressing block 4 to store energy; after the energy storage is finished, the first sealing structure and the second sealing structure are closed, so that the first cavity and the second cavity are sealed, and the energy is stored in the gravity energy storage system;
When grid demand peaks: the first air discharge port 20 and the second air discharge port 21 are opened, and the high-pressure air of the first chamber and the second chamber is sent out for power generation, and in the process, the water drives the first water turbine 6 and the second water turbine 8 to work. In the gravity energy storage system, the first water turbine 6 and the second water turbine 8 can do work outwards when energy is stored and released, so that the energy utilization rate is improved.
As a preferred embodiment of the present invention, as shown in fig. 2, the pressure balancing structure comprises a pressure balancing sealing baffle door 21, a driving motor 24, a driving screw 25 and a pressure balancing port 22 formed on the movable partition board 10, and in combination with fig. 1, the pressure balancing port 22 is located below the liquid level of the first chamber and the second chamber (i.e. the pressure balancing port 22 is located in the position of the middle part of the movable partition board 10, which is located at the lower end in fig. 2, which can ensure that the pressure balancing port 22 is located below the liquid level of the first chamber and the second chamber), and the pressure balancing port 22 can communicate the first chamber and the second chamber with each other; the movable partition plate 10 is internally provided with a containing cavity 22 for containing the pressure balance sealing baffle door 21 above the pressure balance opening 22, the pressure balance sealing baffle door 21 can move up and down in the containing cavity 22, the containing cavity 22 ensures that the pressure balance sealing baffle door 21 can avoid the pressure balance opening 22 after moving upwards, the pressure balance between the first cavity and the second cavity is ensured, the driving motor 24 is arranged at the top of the movable partition plate 10, the driving screw 25 is arranged in the movable partition plate 10, a center hole for containing the driving screw 25 is longitudinally formed in the movable partition plate 10, the upper end of the driving screw 25 is connected with an output shaft of the driving motor 24, the lower end of the driving screw 25 is in threaded connection with the pressure balance sealing baffle door 21, a threaded hole which is in matched connection with the driving screw 25 is formed in the pressure balance sealing baffle door 21, the threaded hole extends downwards from the top of the pressure balance sealing baffle door 21 by a distance, after the pressure balance sealing baffle door 21 moves upwards, the lower end of the driving screw 25 stretches into the inside of the pressure balance sealing baffle door 21, and the driving screw 25 is not displaced longitudinally; the driving screw 25 can drive the pressure balance sealing baffle door 21 to move downwards along the accommodating cavity 22 and seal the pressure balance opening 22, and after the pressure balance sealing baffle door 21 moves to the pressure balance opening 22, the pressure balance opening 22 can be completely sealed, so that the first chamber and the second chamber store energy according to respective pressure levels when the energy is stored. A sealing structure is arranged between the pressure balance sealing baffle door 21 and the pressure balance port 22, for example, a sealing structure such as a sealing ring, a sealing strip and the like is arranged on the pressure balance port 22 at the contact part of the pressure balance port 22 and the pressure balance sealing baffle door 21.
As a preferred embodiment of the present invention, the outer edge of the movable partition 10 is provided with a sealing ring, and the movable partition 10 is hermetically connected with the water tank 1 through the sealing ring. As shown in fig. 1, the structure is similar to a transverse piston structure, the movable partition plate 10 is equivalent to a piston, the water tank 1 is equivalent to a cylinder body, and the tightness between the movable partition plate 10 and the water tank 1 can be ensured, and the relative movement between the movable partition plate 10 and the water tank 1 can be ensured, so that the requirements of adjusting the flow areas of the first chamber and the second chamber and pure high-pressure energy in the invention can be met. The driving mechanism connected to the movable partition board 10 and used for driving the movable partition board 10 to move can enable the movable partition board 10 to move left and right according to requirements, meanwhile, the movable partition board 10 can be enabled to be stable at a preset position, and the stability of the position of the movable partition board 10 in the energy storage and release process is guaranteed. In addition, the upper edge of the movable partition board 10 can be arranged in a hollow structure of the movable partition board 10, the hollow structure can circulate air above the first chamber and the second chamber, and meanwhile, a support in the longitudinal direction (mainly downwards) is provided for the movable partition board 10, so that the sealing between the lower end of the movable partition board 10 and the bottom of the water tank 1 is prevented from being unreliable due to the fact that the pressure in the first chamber and the pressure in the second chamber are larger. As for the arrangement form of the movable partition 10, another embodiment may be adopted, as shown in fig. 1, in which the inner wall of the water tank 1 is provided as a concave section of the cavity in the front-rear direction of the movable partition 10 (i.e., the direction perpendicular to the paper surface in fig. 1), the width of the portion of the water tank 1 above the cavity in the front-rear direction of the movable partition 10 is smaller than the width of the movable partition 10 in the front-rear direction, so that a step is formed above the cavity and in front of the cavity, the upper end of the movable partition 10 is restrained by the step, and the sealing between the lower end of the movable partition 10 and the bottom of the water tank 1 is prevented from being unreliable due to the large pressure in the first chamber and the second chamber.
As a preferred embodiment of the present invention, the driving mechanism of the movable partition plate 10 adopts a screw-nut mechanism, the screw-nut mechanism comprises a screw and a nut which is in fit connection with the screw, the nut is fixedly connected with the water tank 1, one end of the screw is connected with the screw-driving mechanism, and the other end of the screw extends into the water tank 1 and is in rotational connection with the movable partition plate 10. The driving mechanism with the structure is relatively simple and convenient to operate, and particularly, as shown in fig. 1, when the driving mechanism is used, the screw rod is driven to rotate forwards and backwards by using the screw rod driving mechanism, so that the screw rod stretches into the water tank 1 or withdraws from the water tank 1, and the corresponding movable partition plate 10 moves rightwards or leftwards. More specifically, the lead screw nut mechanism should be arranged in consideration of the stability of the movable partition 10. As shown in fig. 1, rear screws are respectively arranged at the upper and lower positions of the liquid surface, and the two screws are vertically symmetrical with respect to the movable partition plate 10, so that the movable partition plate 10 is ensured to move left and right or not to be skewed due to water pressure, and the sealing failure between the movable partition plate 10 and the side wall of the water tank is prevented.
As a preferred embodiment of the present invention, the first sealing structure adopts a first retractable sealing baffle door 15, the first retractable sealing baffle door 15 is disposed on the water tank 1, one end of the first retractable sealing baffle door 15 is connected with a first baffle door driving mechanism, and one end of the first retractable sealing baffle door 15 can extend into the first chamber and be in sealing connection with the movable partition 10 and the water tank 1, so that the upper end of the first chamber is sealed, and the first baffle door driving mechanism can drive the first retractable sealing baffle door 15 to extend into or withdraw from the first chamber; the second sealing structure adopts a second telescopic sealing baffle door 17, the second telescopic sealing baffle door 17 is arranged on the water tank 1, one end of the second telescopic sealing baffle door 17 is connected with a second baffle door driving mechanism, one end of the second telescopic sealing baffle door 17 can extend into the second chamber and is in sealing connection with the movable partition 10 and the water tank 1, the upper end of the second chamber is sealed, and the second baffle door driving mechanism can drive the second telescopic sealing baffle door 17 to extend into the second chamber or withdraw from the second chamber. The first sealing structure and the second sealing structure are provided as a structure of a retractable sealing baffle door, on one hand, the sealing baffle door structure can bear larger pressure, so that the whole structure is stable, and the tightness is ensured, on the other hand, by taking fig. 1 as an example, the movable partition board 10 can move left and right, that is, the distances between the left and right sides of the movable partition board 10 and the left and right side walls of the water tank 1 are different, and the retractable sealing baffle door structure can adapt to the left and right movement of the movable partition board 10, so that the sealing of the first chamber and the second chamber can be ensured when the movable partition board 10 is at any position.
As a preferred embodiment of the present invention, the movable partition 10 is provided with grooves into which the first and second retractable sealing barrier doors 15 and 17 are fitted, and the grooves are provided with a seal capable of sealing between the first retractable sealing barrier door 15 and the movable partition 10, and a seal capable of sealing between the second retractable sealing barrier door 17 and the movable partition 10. In this embodiment, the groove and the sealing member are provided, firstly, the sealing requirement can be ensured, and secondly, the edges of the first retractable sealing baffle door 15 and the second retractable sealing baffle door 17 can be embedded into the groove, so that the sealing capability of the first retractable sealing baffle door 15 and the second retractable sealing baffle door 17 in high-pressure sealing is improved.
As a preferred embodiment of the present invention, the first and second separation layers are flexible first and second deformable rubber films 13 and 12, respectively, and the edge of the first deformable rubber film 13 is in sealing connection with the water tank 1 and the movable partition 10, and the edge of the second deformable rubber film 12 is in sealing connection with the water tank 1 and the movable partition 10. The first deformable rubber film 13 and the second deformable rubber film 12 can meet the requirement of isolating compressed air from water, and can be deformed by utilizing the elasticity thereof.
As a preferred embodiment of the present invention, a first air sealing barrier door 14 for turning off or on the first air discharge port 20 is provided at the first air discharge port 20, and a second air sealing barrier door 16 for turning off or on the first air discharge port 21 is provided at the second air discharge port 21.
As a preferred embodiment of the present invention, the first communication channel 18 is provided with a third sealing structure for closing the first communication channel 18; the second communication channel 19 is provided with a fourth sealing structure for closing the second communication channel 19; the third sealing structure adopts a first sealing baffle door 7, and the fourth sealing structure adopts a second sealing baffle door 9. The third sealing structure and the fourth sealing structure can be respectively used for maintaining the pressure of the first gravity vertical shaft 2 and the second gravity vertical shaft 4 after energy storage after closing, so that the stored pressure is prevented or slowed down to be leaked slowly. The third sealing structure and the fourth sealing structure are opened when the energy is released.
As a preferred embodiment of the present invention, the first communication channel 18 and the second communication channel 19 have the same cross section, the first gravity shaft 2 and the second gravity shaft 4 are the same, and the first gravity pressing block 3 and the second gravity pressing block 5 are the same.
Examples
As shown in fig. 1, following the above technical scheme, the gravity energy storage system of the present embodiment includes a water tank 1, a first gravity shaft 2, a first gravity pressing block 3, a second gravity shaft 4, a second gravity pressing block 5, a first water turbine 6, a first sealing barrier door 7, a second water turbine 8, a second sealing barrier door 9, a movable partition 10, a driving screw 11, a second deformable rubber film 12, a first deformable rubber film 13, a first air sealing barrier door 14, a first retractable sealing barrier door 15, a second air sealing barrier door 16, and a second retractable sealing barrier door 17. The lower end of the water tank 1 is respectively communicated with the first gravity vertical shaft 2 and the second gravity vertical shaft 4 through a first communication channel 18 and a second communication channel 19, and the first water turbine 6 and the first sealing baffle door 7 are arranged on the first communication channel 18; a second water turbine 8 and a second sealing baffle door 9 are arranged on the second communication channel 19; the first gravity pressing block 3 is arranged in the first gravity shaft 2, and the second gravity pressing block 5 is arranged in the second gravity shaft 4. The movable partition board 10 is arranged in the water tank 1, the movable partition board 10 is rotationally connected with two driving screws 11, the two driving screws 11 are respectively positioned at the upper and lower positions of the liquid level, and the movable partition board is driven to move left and right by virtue of the driving screws. The water tank 1 is divided into two sides by a movable partition 10, and a first deformable rubber film 13 and a second deformable rubber film 12 are respectively arranged on the water surfaces of the two sides, and the rubber films can be compressed, stretched and moved up and down to separate air medium from water. The chambers in the tank 1 above the movable partition 10 are in communication. The upper end of the movable partition plate 10 is provided with a first telescopic sealing baffle door 15 and a second telescopic sealing baffle door 17, and can automatically extend and shorten along with the isolation movement. The upper outlet of the water tank 1 is provided with two air outlets, and a first air sealing baffle door 14 and a second air sealing baffle door 16 are respectively arranged at the left air outlet and the right air outlet. The movable partition board 10 is provided with a pressure balance structure for balancing the water pressure between the first chamber and the second chamber, and as shown in fig. 2, the pressure balance structure comprises a pressure balance sealing baffle door 21, a driving motor 24, a driving screw 25 and a pressure balance port 22 arranged on the movable partition board 10, wherein the pressure balance port 22 is positioned at a position below the liquid level of the first chamber and the second chamber, and the pressure balance port 22 can mutually communicate the first chamber and the second chamber; a containing cavity 22 for placing a pressure balance sealing baffle door 21 is arranged above the pressure balance opening 22 in the movable partition plate 10, a driving motor 24 is arranged at the top of the movable partition plate 10, a driving screw 25 is arranged in the movable partition plate 10, the upper end of the driving screw 25 is connected with an output shaft of the driving motor 24, the lower end of the driving screw 25 is in threaded connection with the pressure balance sealing baffle door 21, and a threaded hole matched and connected with the driving screw 25 is formed in the pressure balance sealing baffle door 21; the driving screw 25 can drive the pressure balance seal barrier door 21 to move down along the accommodation chamber 22 and seal the pressure balance port 22.
The working method of the gravity energy storage system comprises the following steps:
When the generated energy of the thermal power generating unit is excessive or new energy electricity needs to be consumed, the pressure balance sealing baffle door 21 is moved upwards to balance the water pressure between the first chamber and the second chamber, then the pressure balance sealing baffle door 21 is moved downwards and the pressure balance opening 22 is sealed, and the starting system converts the electric energy into high-pressure air and sends the high-pressure air into the gravity energy storage system. First, a first telescopic sealing baffle door 15 and a second telescopic sealing baffle door 17 are opened, a first air sealing baffle door 14 and a second air sealing baffle door 16 are closed, a first sealing baffle door 7 and a second sealing baffle door 9 are opened, high-pressure air is fed above a water tank, the liquid level in the water tank is continuously and slowly compressed, water in the water tank continuously flows into a first gravity vertical shaft 2 and a second gravity vertical shaft 4 through a first water turbine and a second water turbine, and the process drives the first water turbine and the second water turbine to rotate for generating electricity. As the water volume increases, the water side lifts the first gravity pressing block 3 and the second gravity pressing block 5 slowly, stores the residual electric energy, closes the first retractable sealing baffle door 15, the second retractable sealing baffle door 17, the first sealing baffle door 7 and the second sealing baffle door 9, and seals all the energy in the system.
When the power grid demand is high, the first air sealing baffle door 14 and the second air sealing baffle door 16 are opened, high-pressure air is sent out to generate power, in the process, along with the continuous sending out of air, the liquid level in the water tank 1 continuously rises, the first gravity pressing block 3 and the second gravity pressing block 5 are slowly lowered, gravity pressing block potential energy is converted into kinetic energy of water, and the first water turbine and the second water turbine are pushed to rotate to generate power. The liquid level in the water tank continuously rises, and air above the water tank is continuously extruded to output constant-pressure air, so that stable power generation on the air side is ensured.
When the outside needs the compressed air of different pressure grades, firstly move the pressure balance seal baffle door 21 upwards, make the water pressure balance between first cavity and the second cavity, the movable baffle 10 is driven to move left and right by two driving screw rods 11, change the flow area of the cavity on the left side and the right side of the movable baffle 10, afterwards move the pressure balance seal baffle door 21 downwards and seal the pressure balance opening 22, thereby classifying the high-pressure air, ensuring that the energy stored on two sides is different, leading the gravity pressing blocks on two sides to have height deviation, the gravity pressing block with large stored energy is high, and the gravity pressing block with small stored energy is low.
According to the scheme, the compressed air energy storage device can meet the requirements of high energy storage efficiency and wide application range of compressed air. The problems existing in the prior compressed air can be thoroughly solved, and the compressed air is combined with pumped storage, so that the energy storage system is efficient and stable.
Claims (9)
1. The gravity energy storage system is characterized by comprising a water tank (1), a first gravity vertical shaft (2), a second gravity vertical shaft (4), a movable partition plate (10) and an air compression device, wherein the movable partition plate (10) is arranged in the water tank (1), the side edge and the bottom of the movable partition plate (10) are in sealing connection with the water tank (1) and can move relatively, a driving mechanism for driving the movable partition plate (10) to move is connected to the movable partition plate (10), a preset distance is reserved between the top of the movable partition plate (10) and the top of the water tank (1), chambers positioned on two sides of the movable partition plate (10) in the water tank (1) are respectively a first chamber and a second chamber, and a first sealing structure capable of closing the first sealing chamber and a second sealing structure capable of closing the second chamber are respectively arranged on two sides of the upper end of the movable partition plate (10); a deformable first separation layer and a deformable second separation layer for separating air and water interfaces are respectively arranged in the first chamber and the second chamber; the first chamber and the second chamber are respectively provided with a first air discharge port (20) and a second air discharge port (21) at positions above the first separation layer and the second separation layer;
The lower end of the water tank (1) is respectively communicated with the first gravity vertical shaft (2) and the second gravity vertical shaft (4) through a first communication channel (18) and a second communication channel (19), a first gravity pressing block (3) and a second gravity pressing block (5) are respectively arranged in the first gravity vertical shaft (2) and the second gravity vertical shaft (4), and a first water turbine (6) is arranged on the first communication channel (18); a second water turbine (8) is arranged on the second communication channel (19);
the top of the water tank (1) is sealed and communicated with a compressed air outlet of the air compression device, and a pressure balancing structure for balancing the water pressure between the first chamber and the second chamber is arranged on the movable partition plate (10);
The pressure balance structure comprises a pressure balance sealing baffle door (21), a driving motor (24), a driving screw (25) and a pressure balance opening (22) formed in the movable partition board (10), wherein the pressure balance opening (22) is positioned below the liquid level of the first chamber and the second chamber, and the pressure balance opening (22) can be used for mutually communicating the first chamber and the second chamber; a containing cavity (22) for placing a pressure balance sealing baffle door (21) is arranged above a pressure balance opening (22) in the movable partition plate (10), a driving motor (24) is arranged at the top of the movable partition plate (10), a driving screw (25) is arranged in the movable partition plate (10), the upper end of the driving screw (25) is connected with an output shaft of the driving motor (24), the lower end of the driving screw (25) is in threaded connection with the pressure balance sealing baffle door (21), and a threaded hole which is in matched connection with the driving screw (25) is formed in the pressure balance sealing baffle door (21); the driving screw (25) can drive the pressure balance sealing baffle door (21) to move downwards along the accommodating cavity (22) and seal the pressure balance opening (22).
2. A gravity energy storage system according to claim 1, characterized in that the driving mechanism of the movable partition (10) adopts a screw-nut mechanism, the screw-nut mechanism comprises a screw and a nut which is connected with the screw in a matching way, the nut is fixedly connected with the water tank (1), one end of the screw is connected with the screw driving mechanism, and the other end of the screw extends into the water tank (1) and is connected with the movable partition (10) in a rotating way.
3. The gravity energy storage system according to claim 1, wherein the first sealing structure adopts a first telescopic sealing baffle door (15), the first telescopic sealing baffle door (15) is arranged on the water tank (1), one end of the first telescopic sealing baffle door (15) is connected with a first baffle door driving mechanism, one end of the first telescopic sealing baffle door (15) can extend into the first chamber and is in sealing connection with the movable partition plate (10) and the water tank (1), so that the upper end of the first chamber is sealed, and the first baffle door driving mechanism can drive the first telescopic sealing baffle door (15) to extend into the first chamber or withdraw from the first chamber;
The second sealing structure adopts a second telescopic sealing baffle door (17), the second telescopic sealing baffle door (17) is arranged on the water tank (1), one end of the second telescopic sealing baffle door (17) is connected with a second baffle door driving mechanism, one end of the second telescopic sealing baffle door (17) can extend into the second cavity and is in sealing connection with the movable partition plate (10) and the water tank (1), the upper end of the second cavity is sealed, and the second baffle door driving mechanism can drive the second telescopic sealing baffle door (17) to extend into the second cavity or withdraw from the second cavity.
4. A gravity energy storage system according to claim 3, characterised in that the movable partition (10) is provided with grooves in which the first (15) and second (17) retractable sealing flaps are embedded, the grooves being provided with seals enabling sealing between the first (15) and movable partition (10) and seals enabling sealing between the second (17) and movable partition (10).
5. A gravity energy storage system according to claim 1, wherein the first and second separation layers are flexible first and second deformable rubber films (13, 12), respectively, and the edges of the first deformable rubber film (13) are in sealing connection with the water tank (1) and the movable partition (10), and the edges of the second deformable rubber film (12) are in sealing connection with the water tank (1) and the movable partition (10).
6. A gravity energy storage system according to claim 1, characterized in that the first air release opening (20) is provided with a first air sealing baffle door (14) for switching off or switching on the first air release opening (20), the second air release opening (21) is provided with a second air sealing baffle door (16) for switching off or switching on the first air release opening (21), the outer edge of the movable partition (10) is provided with a sealing ring, and the movable partition (10) is in sealing connection with the water tank (1) through the sealing ring.
7. A gravity energy storage system according to claim 1, wherein the first communication channel (18) is provided with a third sealing structure for closing the first communication channel (18); a fourth sealing structure for closing the second communication channel (19) is arranged on the second communication channel (19); the third sealing structure adopts a first sealing baffle door (7), and the fourth sealing structure adopts a second sealing baffle door (9).
8. A gravity energy storage system according to claim 1, characterised in that the first communication channel (18) and the second communication channel (19) are identical in cross section, the first gravity shaft (2) and the second gravity shaft (4) are identical, and the first gravity press block (3) and the second gravity press block (5) are identical.
9. A gravity energy storage method, which is characterized in that the gravity energy storage method is carried out by adopting the gravity energy storage system according to any one of claims 1 to 8, and comprises the following steps:
When the generated energy of the thermal power generating unit is excessive or the electric energy generated by new energy needs to be consumed:
opening the pressure balance structure to balance the water pressure between the first chamber and the second chamber, adjusting the position of the movable partition board (10) in the water tank (1) according to a preset pressure level to enable the first chamber and the second chamber to reach a preset flow area, and closing the pressure balance structure after the water pressure between the first chamber and the second chamber is balanced;
Opening the first sealing structure and the second sealing structure, and closing the first air discharge port (20) and the second air discharge port (21); the air compression device is driven to work by the surplus generated energy or the electric energy generated by new energy sources of the thermal power generating unit, high-pressure air of the air compression device enters the upper part of the inner cavity of the water tank (1), the liquid level in the first cavity and the liquid level in the second cavity are compressed, water in the first cavity flows into the first gravity vertical shaft (2) through the first communication channel (18) and drives the first water turbine (6) to work in the process, and the water entering the first gravity vertical shaft (2) lifts the first gravity pressing block (2) to store energy; the water in the second chamber flows into the second gravity vertical shaft (4) through the second communication channel (19) and drives the second water turbine (8) to work in the process, and the water entering the second gravity vertical shaft (4) lifts the second gravity pressing block (4) to store energy; after the energy storage is finished, the first sealing structure and the second sealing structure are closed, so that the first cavity and the second cavity are sealed;
When grid demand peaks: and opening the first air discharge port (20) and the second air discharge port (21) to send out high-pressure air of the first chamber and the second chamber to generate electricity, wherein in the process, water drives the first water turbine (6) and the second water turbine (8) to work.
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| CN202210461544.2A CN114914917B (en) | 2022-04-28 | 2022-04-28 | Gravity energy storage system and method |
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| CN202210461544.2A CN114914917B (en) | 2022-04-28 | 2022-04-28 | Gravity energy storage system and method |
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| WO2021143349A1 (en) * | 2020-01-14 | 2021-07-22 | 中国华能集团有限公司 | Gravity-compressed air energy storage system and working method therefor |
| CN113550803A (en) * | 2021-08-12 | 2021-10-26 | 西安热工研究院有限公司 | Air storage device and method for storing energy by gravity compressed air |
| CN214780438U (en) * | 2020-11-19 | 2021-11-19 | 中国华能集团有限公司 | Gravity type compressed air energy storage vertical shaft |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021143349A1 (en) * | 2020-01-14 | 2021-07-22 | 中国华能集团有限公司 | Gravity-compressed air energy storage system and working method therefor |
| CN214780438U (en) * | 2020-11-19 | 2021-11-19 | 中国华能集团有限公司 | Gravity type compressed air energy storage vertical shaft |
| CN113550803A (en) * | 2021-08-12 | 2021-10-26 | 西安热工研究院有限公司 | Air storage device and method for storing energy by gravity compressed air |
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