CN216811786U - Compressed air energy storage system - Google Patents
Compressed air energy storage system Download PDFInfo
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- CN216811786U CN216811786U CN202122637897.7U CN202122637897U CN216811786U CN 216811786 U CN216811786 U CN 216811786U CN 202122637897 U CN202122637897 U CN 202122637897U CN 216811786 U CN216811786 U CN 216811786U
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Abstract
The utility model belongs to the technical field of energy storage, and particularly discloses a compressed air energy storage system which comprises a water storage tank, an air storage tank and a compressed air energy storage unit, wherein the water storage tank is used for storing water, the air storage tank is connected with the water storage tank, the horizontal height of the highest point in the air storage tank is lower than the horizontal height of the lowest point in the water storage tank, the compressed air energy storage unit is connected with the air storage tank, the compressed air energy storage unit is used for generating compressed air and inputting the compressed air into the air storage tank, and the compressed air energy storage unit also generates electric energy by utilizing the compressed air exhausted from the air storage tank. The compressed air energy storage system can reduce the waste of compressed air and improve the utilization rate of the compressed air.
Description
Technical Field
The utility model relates to the technical field of energy storage, in particular to a compressed air energy storage system.
Background
Compressed air energy storage is a power energy storage system capable of realizing large-capacity and long-time electric energy storage, and the compressed air is compressed to high pressure by a compressor and stored to store redundant power, and the high-pressure air is released and expanded to do work and generate power when power is needed. Therefore, an air storage with an ultra-large volume is required to be configured in the compressed air energy storage device, the pressure of the air storage is improved for reducing the volume in the related art, however, the improvement of the pressure of the air storage causes the difficulty in building the air storage and the increase of the investment, and the difficulty in designing a compressor unit is too large.
SUMMERY OF THE UTILITY MODEL
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the air storage in the compressed air energy storage system in the related art is in a fixed volume form, the air storage runs in a certain upper limit pressure and lower limit pressure range, and when the pressure of the air storage reaches the lower limit pressure, the air cannot be continuously exhausted to push the expansion machine to do work. The inventor of the application finds that the gas storage base gas in the compressed air energy storage system in the related art reaches 60% -70% of gas amount, which causes great waste of the compressed gas.
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the utility model provides a compressed air energy storage system which can reduce the waste of compressed air and improve the utilization rate of the compressed air.
The compressed air energy storage system of the embodiment of the utility model comprises: the water storage tank is used for storing water; the gas storage is connected with the water storage tank, and the horizontal height of the highest point in the gas storage is lower than the horizontal height of the lowest point in the water storage tank; the compressed air energy storage unit is connected with the gas storage, is used for generating compressed gas and inputting the compressed gas into the gas storage, and generates electric energy by utilizing the compressed gas exhausted from the gas storage.
The compressed air energy storage system provided by the embodiment of the utility model can reduce the waste of compressed air and improve the utilization rate of the compressed air.
In some embodiments, the compressed air energy storage system further comprises a connecting pipe, one end of the connecting pipe is communicated with the water storage tank, and the other end of the connecting pipe is communicated with the air storage tank.
In some embodiments, a first outlet is provided at the lowest point of the bottom of the gas storage, the connecting pipe is provided at the first outlet, and the connecting pipe is communicated with the first outlet.
In some embodiments, the compressed air energy storage system further comprises a control valve, the connecting pipe has a water inlet end and a water outlet end in the extending direction of the connecting pipe, one end of the control valve is communicated with the air storage, the other end of the control valve is communicated with the water inlet end of the connecting pipe, and the water outlet end of the connecting pipe is communicated with the water storage tank.
In some embodiments, the compressed air energy storage unit comprises a compressor unit and a generator, the generator is connected with the compressor unit to drive the compressor unit to operate to generate compressed air, and the compressor unit is connected with the air storage to enable the compressed air to enter the air storage.
In some embodiments, the compressed air energy storage unit further comprises an expansion unit and a generator, one end of the expansion unit is connected with the air storage, the expansion unit is connected with the generator, and the expansion unit drives the generator to generate electric energy by using the compressed air exhausted from the air storage.
In some embodiments, a first inlet is provided at a highest point of a top of the gas storage reservoir, the first inlet being in communication with the compressor unit, and a second outlet being in communication with the expander unit.
In some embodiments, the horizontal height of the lowest point in the reservoir is A, the horizontal height of the highest point in the reservoir is B, and B +50m is greater than or equal to A and less than or equal to B +2500 m.
In some embodiments, the compressed air energy storage system has a installed capacity of C, and 1MW ≦ C ≦ 100 MW.
Drawings
Fig. 1 is a schematic structural view of a compressed air energy storage system according to an embodiment of the present invention.
Reference numerals:
the water storage tank 1 is provided with a water storage tank,
a gas reservoir 2, a first outlet 21, a first inlet 22, a second outlet 23,
the system comprises a connecting pipe 3, a compressor unit 4, an expander unit 5, a motor 6, a generator 7 and a control valve 8.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
The compressed air energy storage system comprises a water storage tank 1 and an air storage tank 2 compressed air energy storage unit.
The reservoir 1 is used for storing water.
It should be noted that the reservoir 1 may be built in a pumped storage power station or by using natural mountaintops and other high-level objects.
The gas storage reservoir 2 is connected with the water storage reservoir 1, and the level of the highest point in the gas storage reservoir 2 is lower than the level of the lowest point in the water storage reservoir 1.
It should be noted that the horizontal height refers to the difference of two horizontal levels, in this embodiment, the horizontal height of the highest point in the gas storage 2 refers to the horizontal level of the highest point in the gas storage 2, and the horizontal height of the lowest point in the water storage 1 refers to the horizontal level of the lowest point in the water storage 1. The gas storage 2 can be an artificial gas storage 2 arranged on the ground, and can also be a hole gas storage 2 arranged underground or in a mountain by using geological conditions on site.
Specifically, as shown in fig. 1, the highest point in the gas reservoir 2 is at a lower level than the lowest point in the water reservoir 1.
The compressed air energy storage unit is connected with the air storage 2, is used for generating compressed air and inputting the compressed air into the air storage 2, and can also generate electric energy by utilizing the compressed air exhausted from the air storage 2.
The compressed air energy storage system provided by the embodiment of the utility model is provided with the water storage tank 1 and the air storage tank 2, the water storage tank 1 is communicated with the air storage tank 2, the horizontal height of the water storage tank 1 is higher than the horizontal height of the air storage tank 2, when the air storage tank 2 exhausts outwards, the pressure in the air storage tank 2 is reduced, after the pressure in the air storage tank 2 is reduced, water in the water storage tank 1 enters the air storage tank 2, the air storage tank 2 is filled with water, and the air storage tank 2 continues to exhaust until the water is filled, so that all compressed air in the air storage tank 2 can be exhausted out of the air storage tank 2, the waste of the compressed air can be reduced, and the utilization rate of the compressed air is improved.
In some embodiments, the compressed air energy storage system further comprises a connecting pipe 3, one end of the connecting pipe 3 is communicated with the water reservoir 1, and the other end of the connecting pipe 3 is communicated with the air reservoir 2.
Specifically, as shown in fig. 1, the upper end of the connection pipe 3 is communicated with the water reservoir 1, and the lower end of the connection pipe 3 is communicated with the bottom of the gas storage 2.
In some embodiments, a first outlet 21 is provided at the lowest point of the bottom of the gas storage 2, the connection pipe 3 is provided at the first outlet 21, and the connection pipe 3 communicates with the first outlet 21.
Specifically, as shown in fig. 1, the first outlet 21 penetrates the inner and outer walls of the gas storage 2, and the first outlet 21 communicates with the lower end of the connection pipe 3. It should be noted that the lower end of the connecting pipe 3 may be connected to the gas storage 2 via a flange.
In some embodiments, the compressed air energy storage unit further comprises a compressor unit 4 and an electric motor 6, the electric motor 6 is connected with the compressor unit 4 to drive the compressor unit 4 to operate to generate compressed air, and the compressor unit 6 is connected with the air storage 2 to enable the compressed air to enter the air storage 2.
Specifically, as shown in fig. 1, the compressor unit 4 has an outlet pipe (not shown) having one end communicating with the compressor unit 4 and the other end communicating with the top of the gas storage 2.
The compressed air energy storage unit further comprises an expansion unit 5 and a generator 7, one end of the expansion unit 5 is connected with the gas storage 2, the expansion unit 5 is connected with the generator 7, and the expansion unit 5 drives the generator 7 to generate electric energy by utilizing compressed air exhausted from the gas storage 2.
It should be noted that, as shown in fig. 1, the expander set 5 has an air inlet pipe, one end of the air inlet pipe is communicated with the expander set 5, the other end of the air inlet pipe is communicated with the top of the air storage 2, the compressed air stored in the air storage 2 enters the expander set 5 through the air inlet pipe, the expander set 5 drives the generator 7 to do work by using the compressed air to generate electric energy, the compressed air in the air storage 2 enters the expander set 5, and the expander set 5 drives the generator 7 to operate to generate electric energy.
The compressed air energy storage system is provided with the compressor unit 4, the compressor unit 4 is used for utilizing electric energy to compress gas in the low-ebb period of the power grid load, the compressed gas is stored in the gas storage 2, the expansion unit 5 is arranged, the compressed gas in the gas storage 2 is released in the high-peak period of the power grid load, and the expansion unit 5 is pushed to generate electricity, so that the comprehensive utilization rate of energy is improved.
In some embodiments, a first inlet 22 and a second outlet 23 are provided at the highest point of the top of the gas storage 2, the first inlet 22 being in communication with the compressor unit 4 and the second outlet 23 being in communication with the expander unit 5.
Specifically, as shown in fig. 1, the first inlet 22 and the second outlet 23 both penetrate through the inner and outer walls of the gas storage 2, the first inlet 22 and the second outlet 23 are arranged at intervals, the first inlet 22 is communicated with the gas outlet pipe, and the second outlet 23 is communicated with the gas inlet pipe.
In some embodiments, the compressed air energy storage system further comprises a control valve 8, the connecting pipe 3 has a water inlet end and a water outlet end in the extending direction thereof, one end of the control valve 8 is communicated with the air storage 2, the other end of the control valve 8 is communicated with the water inlet end of the connecting pipe 3, and the water outlet end of the connecting pipe 3 is communicated with the water storage tank 1.
Specifically, as shown in fig. 1, the control valve 8 is connected to the gas storage 2, an inlet of the control valve 8 is communicated with the first outlet 21, and an outlet of the control valve 8 is communicated with the lower end of the connection pipe 3.
It should be noted that the control valve 8 may be an automatic valve, and may automatically control the communication or the closing of the gas storage 2 and the connecting pipe 3.
The compressed air energy storage system provided by the embodiment of the utility model is provided with the control valve 8, so that the communication or the closing of the air storage 2 and the water storage tank 1 can be controlled, and the automation degree of the compressed air energy storage system is improved.
In some embodiments, the lowest point in the water reservoir 1 is located at a horizontal height A, the highest point in the gas storage 2 is located at a horizontal height B, and B +50m is less than or equal to A and less than or equal to B +2500 m.
When the gas storage 2 is built on the ground, the horizontal height B of the highest point in the gas storage 2 is 0m, and the horizontal height a of the lowest point in the water reservoir 1 may be 50m, 80m, 90m, 120m, 150m, 200m, 400m, 800m, 900m, 1200m, 1500m, 2000m, and 2500 m. It will be appreciated that the level at which the lowest point in the reservoir 1 is located may be adjusted according to the location at which the reservoir 2 is located and the height of the pumped storage power station or natural mountaintops and other high objects.
In some embodiments, the compressed air energy storage system has a installed capacity of C, and 1MW C100 MW.
It should be noted that the installed capacity of the compressed air energy storage system may be 10MW, 20MW, 40MW, 50MW, 70MW, 80MW, 90MW, or 100 MW. It will be appreciated that the installed capacity of the compressed air energy storage system may be adjusted according to the power of the compressor unit 4 and the size of the construction site.
In some embodiments, the pressure within the reservoir 2 is P, and 0.5MPa P25 MPa.
The pressure P in the gas reservoir 2 may be 0.5MPa, 10MPa, 15MPa, 20MPa or 25 MPa.
The operation of a compressed air energy storage system according to an embodiment of the present invention will now be described with reference to figure 1.
1. The pressure of the gas storage 2 is equal to the hydrostatic pressure of the water storage pool 1
When energy is stored, the motor 6 drives the compressor unit 4 to operate, the compressor unit 4 generates compressed air, the compressed air enters the air storage 2 through the air outlet pipe, the air storage 2 is inflated, the inflation pressure is close to the water pressure in the connecting pipe 3, water stored in the air storage 2 is pumped into the water storage pool 1 by the compressed air, and after the water in the air storage 2 is exhausted, the compressor unit 4 stops operating, and the storage of the compressed air is completed.
When energy is released, the air storage 2 exhausts, compressed air enters the expansion unit 5 through the air inlet pipe, the expansion unit 5 drives the generator 7 to run and generate electricity by utilizing the compressed air, water in the water storage pool 1 enters the air storage 2 through the connecting pipe 3, the air storage 2 is filled with water, the air storage 2 continues to exhaust until the air storage 2 is filled with water, and the steps are repeated in a circulating mode to realize energy storage and utilization of the compressed air.
2. The pressure of the gas storage 2 is higher than the hydrostatic pressure of the water storage pool 1
When energy is stored, the motor 6 drives the compressor unit 4 to operate, the compressor unit 4 generates compressed air, the compressed air enters the air storage 2 through the air outlet pipe, the air storage 2 is inflated, the control valve 8 is opened, the inflation pressure is close to the water pressure in the connecting pipe 3, water stored in the air storage 2 is pumped into the water storage tank 1 by the compressed air, after water in the air storage 2 is exhausted, the control valve 8 is closed, the air storage 2 continues to be inflated, and when the pressure in the air storage 2 reaches the preset highest pressure, the compressor unit 4 stops operating, and the storage of the compressed air is completed.
When energy is released, the gas storage 2 exhausts, compressed gas enters the expansion unit 5 through the gas inlet pipe, the expansion unit 5 drives the generator 7 to run and generate electricity by utilizing the compressed gas, when the pressure of the gas storage 2 is reduced to be lower than the water pressure in the connecting pipe 3, the control valve 8 is opened, water in the water storage pool 1 enters the gas storage 2 through the connecting pipe 3, the gas storage 2 is filled with water, the gas storage 2 continues to exhaust until the gas storage 2 is filled with water, and the circulation is repeated, so that energy storage and utilization of the compressed air are realized.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
1. A compressed air energy storage system, comprising:
the water storage tank is used for storing water;
the gas storage is connected with the water storage tank, and the horizontal height of the highest point in the gas storage is lower than the horizontal height of the lowest point in the water storage tank;
the compressed air energy storage unit is connected with the gas storage, is used for generating compressed gas and inputting the compressed gas into the gas storage, and generates electric energy by utilizing the compressed gas exhausted from the gas storage;
one end of the connecting pipe is communicated with the reservoir, and the other end of the connecting pipe is communicated with the gas storage;
the connecting pipe is provided with a water inlet end and a water outlet end in the extending direction, one end of the control valve is communicated with the gas storage, the other end of the control valve is communicated with the water inlet end of the connecting pipe, and the water outlet end of the connecting pipe is communicated with the reservoir; when the energy is released, the pressure of the air storage when the air storage is exhausted is lower than the water pressure in the connecting pipe, the control valve is opened, and the water in the water storage enters the air storage to enable the air storage to be continuously exhausted until the air storage is full of water.
2. The compressed air energy storage system of claim 1, wherein a first outlet is provided at a lowest point of the bottom of the air storage, the connecting pipe is provided at the first outlet, and the connecting pipe is communicated with the first outlet.
3. The compressed air energy storage system of claim 1, wherein the compressed air energy storage unit comprises a compressor unit and a generator, the generator is connected with the compressor unit to drive the compressor unit to operate to generate compressed air, and the compressor unit is connected with the air storage to enable the compressed air to enter the air storage.
4. The compressed air energy storage system of claim 3, wherein the compressed air energy storage unit further comprises an expansion unit and a generator, one end of the expansion unit is connected with the air storage, the expansion unit is connected with the generator, and the expansion unit drives the generator to generate electric energy by using compressed air exhausted from the air storage.
5. A compressed air energy storage system according to claim 4 wherein the top of the air storage reservoir is provided at its highest point with a first inlet communicating with the compressor unit and a second outlet communicating with the expander unit.
6. The compressed air energy storage system of claim 1, wherein the lowest point in the reservoir is at a level a, the highest point in the reservoir is at a level B, and B +50m ≦ a ≦ B +2500 m.
7. A compressed air energy storage system according to any one of claims 1 to 6 wherein the installed capacity of the compressed air energy storage system is C and 1MW C100 MW.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115223436A (en) * | 2022-07-07 | 2022-10-21 | 西安热工研究院有限公司 | Experimental model device for simulating operation of gravity compressed air energy storage system |
| CN115559587A (en) * | 2022-10-31 | 2023-01-03 | 中国矿业大学 | Gas storage reservoir air plug structure with reasonable force flow arc line |
| CN115853587A (en) * | 2022-10-12 | 2023-03-28 | 中国矿业大学 | Multi-chamber combined compressed air energy storage system and method for abandoned mine |
| CN115898740A (en) * | 2022-11-11 | 2023-04-04 | 武汉大学 | Compressed air and hydroelectric power generation combined energy storage system for waste mine hole |
| CN115978439A (en) * | 2022-12-15 | 2023-04-18 | 中国电建集团西北勘测设计研究院有限公司 | High-pressure gas storage drainage system and method for compressed air energy storage |
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2021
- 2021-10-29 CN CN202122637897.7U patent/CN216811786U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115223436A (en) * | 2022-07-07 | 2022-10-21 | 西安热工研究院有限公司 | Experimental model device for simulating operation of gravity compressed air energy storage system |
| CN115223436B (en) * | 2022-07-07 | 2023-11-17 | 西安热工研究院有限公司 | Experimental model device for simulating operation of gravity compressed air energy storage system |
| CN115853587A (en) * | 2022-10-12 | 2023-03-28 | 中国矿业大学 | Multi-chamber combined compressed air energy storage system and method for abandoned mine |
| CN115559587A (en) * | 2022-10-31 | 2023-01-03 | 中国矿业大学 | Gas storage reservoir air plug structure with reasonable force flow arc line |
| CN115898740A (en) * | 2022-11-11 | 2023-04-04 | 武汉大学 | Compressed air and hydroelectric power generation combined energy storage system for waste mine hole |
| CN115978439A (en) * | 2022-12-15 | 2023-04-18 | 中国电建集团西北勘测设计研究院有限公司 | High-pressure gas storage drainage system and method for compressed air energy storage |
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