Isobaric Maintenance System and Control Method for Underwater Compressed Air Energy Storage Test

Abstract

This invention discloses an isobaric maintenance system and control method for underwater compressed air energy storage tests. The system includes: an indoor liquid storage device containing a liquid medium; an air storage device disposed inside the indoor liquid storage device; the air storage device includes an inflatable airbag and an exhaust airbag; and an air supply and exhaust device connected to the inflatable airbag and the exhaust airbag respectively, capable of controlling the inflatable airbag to inflate and simultaneously controlling the exhaust airbag to exhaust. The air supply and exhaust device can control the air intake of the inflatable airbag and the air exhaust of the exhaust airbag to be the same, so as to ensure that the liquid discharge volume of the air storage device remains constant. This invention has a simple structure, the test method is easy to implement, it can effectively improve the reliability of air storage device testing, and at the same time reduce the test cost.

Description

Technical Field

[0001] This invention relates to the field of energy storage device technology, and specifically to an isobaric maintenance system and control method for underwater compressed air energy storage tests. Background Technology

[0002] Underwater compressed air energy storage is an isobaric compressed air energy storage technology. Unlike conventional compressed air energy storage, which uses underground caves or rigid storage tanks on the ground, underwater compressed air energy storage places the storage device underwater. It utilizes the static pressure characteristics of water to achieve isobaric storage and release of compressed air. It has advantages such as high efficiency and flexible and variable energy storage scale, providing a brand-new idea and feasible technical solution for the large-scale and smooth output of marine renewable energy.

[0003] As a key component of isobaric compressed air energy storage systems, flexible gas storage devices are crucial for design and fabrication. Establishing a database of material properties for flexible gas storage devices, studying their structural and thermodynamic characteristics, and revealing their fatigue failure mechanisms are all essential. Conducting indoor testing of gas storage devices can significantly reduce research costs and improve efficiency. However, due to limited indoor space, the tank used to simulate a water environment cannot be infinitely large. The inflation and deflation process of the gas storage device causes changes in water level, leading to variations in the external water pressure environment, deviating from the design conditions, and affecting the accuracy of the test, especially in low-pressure tests.

[0004] To ensure a constant water level during the inflation and deflation of the gas storage device, a relatively easy existing method is to install an overflow port in the chamber. During inflation, the water discharged from the gas storage device overflows out of the chamber, while during deflation, water is continuously added to the chamber to maintain the water level and ensure a constant test environment pressure. However, this method requires constant drainage and replenishment, necessitating the addition of a circulating water pump and a water tank to avoid water waste, thus increasing test costs. Furthermore, this method struggles to match the water inflow rate with the gas storage device's deflation rate and can introduce water flow that can negatively impact the test results. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the existing method of setting an overflow port on the box, which increases the test cost and makes it difficult to ensure that the water inlet speed matches the exhaust speed of the gas storage device, thereby providing an isobaric maintenance system and control method for underwater gas storage test of compressed air energy storage.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The isobaric maintenance system for underwater compressed air energy storage tests includes:

[0008] An indoor liquid storage device containing a liquid medium;

[0009] A gas storage device is installed inside the indoor liquid storage device; the gas storage device includes an inflatable airbag and an exhaust airbag.

[0010] An air supply and exhaust device is connected to the inflatable airbag and the exhaust airbag respectively. The air supply and exhaust device controls the inflation action of the inflatable airbag and simultaneously controls the exhaust action of the exhaust airbag. The air supply and exhaust device also controls the air intake of the inflatable airbag and the air exhaust of the exhaust airbag to be the same, so as to ensure that the liquid discharge volume of the air storage device remains unchanged.

[0011] Optionally, the indoor liquid storage device includes a housing.

[0012] Optionally, the interior of the housing is provided with a partition that divides the housing into two independent housing units; the partition has a connection port that can connect the two independent housing units; the inflatable airbag and the deflatable airbag are respectively disposed inside one of the independent housing units.

[0013] Optionally, the enclosure is a visual enclosure made of transparent glass.

[0014] Optionally, the inflatable airbag and the deflated airbag are suspended by a hanging line on a crossbeam located above the housing.

[0015] Optionally, the air supply and exhaust device includes:

[0016] An air supply component is connected to the inflatable airbag and the deflated airbag respectively, and is capable of inflating the inflatable airbag and the deflated airbag;

[0017] A first gas supply pipe is connected to the gas supply assembly; a first valve, a second valve and a third valve are sequentially installed on the first gas supply pipe.

[0018] The second air supply pipe has one end connected to the middle of the first air supply pipe located between the first valve and the second valve, and the other end connected to the inflatable air bag; the second air supply pipe is sequentially provided with a fourth valve and a fifth valve.

[0019] The third gas supply pipe has one end connected to the middle of the first gas supply pipe located between the second valve and the third valve, and the other end connected to the exhaust air bag; a sixth valve is provided on the third gas supply pipe.

[0020] The fourth gas supply pipe has one end connected to the second gas supply pipe located between the fourth valve and the fifth valve, and the other end connected to the outside atmosphere; the end of the first gas supply pipe is connected to the middle of the fourth gas supply pipe; the fourth gas supply pipe is equipped with a seventh valve.

[0021] Optionally, a first flow meter for monitoring the gas flow rate on the first gas supply pipe is provided on the first gas supply pipe; and a second flow meter for monitoring the gas flow rate on the fourth gas supply pipe is provided on the fourth gas supply pipe.

[0022] Optionally, temperature detection components and pressure detection components are respectively provided on the second gas supply pipe, the third gas supply pipe, and the housing.

[0023] Optionally, a liquid supply component for supplying liquid into the box is provided on the upper part of the side wall of the box; and a drainage component for discharging the liquid medium inside the box is provided on the bottom wall of the box.

[0024] A method for maintaining pressure during underwater compressed air energy storage tests is provided. The method is based on the pressure maintenance system for underwater compressed air energy storage tests. The method involves controlling the inflation of the inflation bladder and the deflation of the deflation bladder through an air supply and exhaust device, ensuring that the air intake of the inflation bladder is the same as the air exhaust of the deflation bladder, so as to maintain the liquid discharge volume of the storage device and achieve the purpose of maintaining the liquid level height.

[0025] Optionally, the method specifically includes the following steps:

[0026] S1. Open the liquid supply assembly and close the drain assembly; supply liquid medium into the tank through the liquid supply assembly, so that the liquid medium submerges the highest point of the partition;

[0027] S2. Open the first valve, the second valve, the fifth valve, the sixth valve, and the seventh valve, and close the third valve and the fourth valve. Inflate the exhaust airbag through the air supply assembly and fill the exhaust airbag with gas. At this time, the exhaust airbag is in a full state, and the inflatable airbag is in a deflated state.

[0028] S3. Close the second and seventh valves, and open the third, sixth, fourth, and fifth valves. Control the exhaust volume of the exhaust bag by controlling the opening of the third valve, and control the inflation volume of the inflation bag by controlling the opening of the fourth valve, so that the values ​​displayed by the first and second flow meters are the same.

[0029] Furthermore, the pressure inside the tank is monitored in real time by a pressure detection component installed on the tank body to ensure that the water pressure inside the tank remains constant.

[0030] Optionally, a pressure holding test may be performed between step S2 and step S3.

[0031] The technical solution of this invention has the following advantages:

[0032] 1. The isobaric maintenance system for underwater compressed air storage tests provided by this invention controls the air intake and exhaust volume of the inflatable and exhaust airbags to be the same through an air supply and exhaust device. This ensures that the total drainage volume of the two airbags remains constant, thereby maintaining the liquid level in the storage device. Ultimately, this achieves a constant static pressure in the inflatable and exhaust airbags, enabling inflation / deflation tests, fatigue tests, etc. The isobaric maintenance system of this invention has a simple structure and the test method is easy to implement. It effectively improves the reliability of the storage device test while reducing test costs. Furthermore, this invention controls the liquid level in the indoor storage device by controlling the inflation and exhaust of the two airbags, avoiding the introduction of water into the indoor storage device and thus preventing any impact on the storage test results.

[0033] 2. The isobaric maintenance system for underwater compressed air energy storage testing provided by this invention divides the chamber into two independent chamber units by setting internal partitions. The total gas volume in the two chambers is maintained constant by controlling the simultaneous inflation and deflation or deflation and inflation of the airbags in the different chambers. Because the inflatable and deflated airbags in this invention are respectively located inside the two independent chamber units, there is no collision or interference between the two inflatable and deflated airbags, and they do not affect each other. Furthermore, since the two independent chamber units are interconnected, the overall liquid level inside the chamber changes synchronously.

[0034] 3. The isobaric maintenance system for underwater compressed air storage test provided by the present invention has an air supply and exhaust device that can realize the inflation action of the airbag and the airbag, and can also realize that the airbag is inflated while the airbag is venting. The air supply and exhaust device can conveniently control the inflation volume of the airbag to be the same as the air exhaust volume of the airbag.

[0035] 4. The isobaric maintenance system for underwater compressed air energy storage testing provided by this invention includes a first flow meter on the first air supply pipe and a second flow meter on the fourth air supply pipe. This allows test personnel to determine the inflation volume of the air bladder and the deflation volume of the air bladder by observing the values ​​of the first and second flow meters. Test personnel can then conveniently control the opening of the third and fourth valves based on the inflation and deflation volumes of the air bladder. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the isobaric maintenance system for underwater compressed air energy storage test of the present invention.

[0038] Figure 2 This is a partial structural schematic diagram of the isobaric maintenance system for underwater compressed air energy storage tests according to the present invention.

[0039] Figure label:

[0040] 1. Compressor; 2. Housing; 3. Inflatable airbag; 4. Exhaust airbag; 5. Partition; 6. Connection port; 7. Base support; 8. Crossbeam; 9. First air supply pipe; 10. Second air supply pipe; 11. Third air supply pipe; 12. Fourth air supply pipe; 13. First flow meter; 14. Second flow meter; 15. First valve; 16. Second valve; 17. Third valve; 18. Fourth valve; 19. Fifth valve; 20. Sixth valve; 21. Seventh valve; 22. Eighth valve; 23. Ninth valve; 24. First thermometer; 25. Second thermometer; 26. Third thermometer; 27. First pressure gauge; 28. Second pressure gauge; 29. ​​Third pressure gauge; 30. Liquid supply pipe; 31. Drain pipe; 32. Outer frame of the housing; 33. Support plate. Detailed Implementation

[0041] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Example 1

[0046] like Figures 1 to 2 The specific implementation of the isobaric maintenance system for the compressed air energy storage underwater gas storage test shown includes an indoor liquid storage device, a gas storage device, and a gas supply and exhaust device.

[0047] The indoor liquid storage device contains a liquid medium to simulate an underwater environment. A gas storage device is located inside the indoor liquid storage device. An air supply and exhaust device is connected to both an inflatable airbag and an exhaust airbag, controlling both the inflation and deflation of the airbags. The gas storage device includes an inflatable airbag 3 and an exhaust airbag 4, both located inside the indoor liquid storage device.

[0048] The above-mentioned isobaric maintenance system for underwater compressed air energy storage tests controls the air intake of the inflatable airbag 3 and the air exhaust of the exhaust airbag 4 to be the same through the air supply and exhaust device, so that the total drainage volume of the two airbags remains unchanged, thereby ensuring that the liquid discharge volume of the air storage device remains unchanged, thus achieving the purpose of maintaining the liquid level height. Ultimately, the static pressure of the inflatable airbag 3 and the exhaust airbag 4 remains unchanged, and inflation and deflation tests, fatigue tests, etc. can be carried out.

[0049] More specifically, the indoor liquid storage device includes a tank 2. A liquid supply assembly is installed on the upper side wall of the tank 2. A drain assembly is connected to the bottom wall of the tank 2. Before the test begins, liquid can be supplied into the tank 2 through the liquid supply assembly to simulate underwater conditions. After the test, the liquid medium inside the tank 2 can be drained through the drain assembly. When the next test is required, liquid can be re-introduced into the tank 2.

[0050] The liquid supply assembly includes a liquid supply pipe 30 and an eighth valve 22. The eighth valve 22 is installed on the liquid supply pipe. The liquid supply pipe 30 is connected to a liquid supply source, which can be a tap water source. The liquid supply pipe 30 is a tap water supply pipe.

[0051] The drainage assembly includes a drainage pipe 31 and a ninth valve 23. The ninth valve 23 is installed on the drainage pipe, which drains the liquid medium inside the tank 2 into the trench.

[0052] As an improved embodiment, the housing 2 of this invention is internally equipped with a partition 5, which divides the housing 2 into two independent housing units. The inflatable airbag and the deflate airbag are each housed within one independent housing unit. Furthermore, the partition 5 has a connection port 6 that connects the two independent housing units. Because the inflatable airbag and the deflate airbag are respectively housed within two independent housing units, there will be no collision or interference between them, and they will not affect each other. Moreover, since the two independent housing units are interconnected, the overall liquid level change within the housing 2 can be ensured to be synchronized.

[0053] To ensure that test personnel can better observe the internal conditions of chamber 2, this invention sets chamber 2 as a visual chamber enclosed by transparent glass. Furthermore, this invention can also use other materials besides glass; no limitations are imposed here.

[0054] like Figure 2 As shown, as an improved implementation, this embodiment provides an outer frame 32 for the outside of the box 2. The outer frame 32 is made of multiple steel pipes welded together to maintain the stability of the shape of the box 2 and to reinforce the box 2.

[0055] As an improved implementation, in this embodiment, the chamber 2 is mounted on a base support 7. The base support 7 has a certain height and serves to support the chamber 2, the gas storage device, and the gas supply and exhaust device. A support plate 33 is provided at the top of the base support 7 to facilitate the standing of the test personnel.

[0056] As an improved implementation, in this embodiment, the inflatable airbag and the deflated airbag are suspended on the crossbeam 8 located above the box 2 by means of a suspension line. By suspending the inflatable airbag and the deflated airbag, the position of the inflatable airbag and the deflated airbag inside the box 2 is more stable.

[0057] More specifically, the air supply and exhaust device includes an air supply assembly, a first air supply pipe 9, a second air supply pipe 10, a third air supply pipe 11, a fourth air supply pipe 12, a first valve 15, a second valve 16, a third valve 17, a fourth valve 18, a fifth valve 19, a sixth valve 20, a seventh valve 21, a first flow meter 13, and a second flow meter 14.

[0058] The air supply component is connected to both the inflation bladder and the deflation bladder, enabling it to inflate both bladders. The air supply component is compressor 1, which delivers compressed gas to provide a test gas source for the gas storage device.

[0059] The first gas supply pipe 9 is connected to the gas supply assembly. The first gas supply pipe 9 is equipped with a first valve 15, a second valve 16 and a third valve 17 in sequence.

[0060] One end of the second air supply pipe 10 is connected to the middle of the first air supply pipe 9 located between the first valve 15 and the second valve 16, and the other end of the second air supply pipe 10 is connected to the inflatable airbag. A fourth valve 18 and a fifth valve 19 are sequentially provided on the second air supply pipe 10.

[0061] One end of the third air supply pipe 11 is connected to the middle of the first air supply pipe 9, which is located between the second valve 16 and the third valve 17, and the other end of the third air supply pipe 11 is connected to the exhaust airbag. A sixth valve 20 is provided on the third air supply pipe 11.

[0062] One end of the fourth gas supply pipe 12 is connected to the second gas supply pipe 10, which is located between the fourth valve 18 and the fifth valve 19, and the other end of the fourth gas supply pipe 12 is connected to the outside atmosphere. The end of the first gas supply pipe 9 is connected to the middle of the fourth gas supply pipe 12. A seventh valve 21 is provided on the fourth gas supply pipe 12, and the connection between the fourth gas supply pipe 12 and the atmosphere is controlled by controlling the opening and closing of the seventh valve 21.

[0063] As an improved implementation, this embodiment includes a first flow meter 13 on the first gas supply pipe 9 for monitoring the gas flow rate on the first gas supply pipe 9; and a second flow meter 14 on the fourth gas supply pipe 12 for monitoring the gas flow rate on the fourth gas supply pipe 12. This allows the test personnel to determine the inflation volume of the inflatable airbag and the deflation volume of the deflation airbag by observing the values ​​of the first flow meter 13 and the second flow meter 14. The opening degrees of the third valve 17 and the fourth valve 18 are then controlled based on the inflation volume of the inflatable airbag and the deflation volume of the deflation airbag.

[0064] To facilitate the control of the opening degree of the third valve 17 and the fourth valve 18, this embodiment uses a controller to control the opening degree of the third valve 17 and the fourth valve 18. The controller can be a PLC controller or other types of controller. The output terminals of the first flow meter 13 and the second flow meter 14 are connected to the input terminal of the controller. The controller collects the flow rate data of the first flow meter 13 and the second flow meter 14, compares the flow rate data of the first flow meter 13 and the second flow meter 14, and then controls the opening degree of the third valve 17 and the fourth valve 18 based on the flow rate data of the first flow meter 13 and the second flow meter 14.

[0065] Furthermore, the controlled ends of the first valve 15, the second valve 16, the fifth valve 19, the sixth valve 20, and the seventh valve 21 are respectively connected to the output end of the controller, enabling the controller to perform intelligent control of each valve.

[0066] As an improved implementation, this embodiment provides temperature detection components and pressure detection components on the second gas supply pipe 10, the third gas supply pipe 11, and the housing 2, respectively. The temperature detection component includes a thermometer to detect the temperature. The pressure detection component includes a pressure gauge to detect the pressure.

[0067] When studying the structural and thermodynamic properties of the inflatable airbag 3 and the exhaust airbag 4 and revealing their fatigue failure mechanism, it is necessary to detect the pressure and temperature inside the inflatable airbag 3 and the exhaust airbag 4. However, it is inconvenient to house temperature and pressure detection components inside the inflatable airbag 3 and the exhaust airbag 4. Therefore, in this embodiment, a first thermometer 24 and a first pressure gauge 27 are installed on the second air supply pipe 10, and a second thermometer 25 and a second pressure gauge 28 are installed on the third air supply pipe 11. By monitoring the temperature and pressure on the second air supply pipe 10, the temperature and pressure changes inside the inflatable airbag 3 are reflected; and by monitoring the temperature and pressure on the third air supply pipe 11, the temperature and pressure changes inside the exhaust airbag 4 are reflected, thus aiding the research.

[0068] The chamber 2 is equipped with a third thermometer 26 and a third pressure gauge 29.

[0069] The pressure inside the chamber 2 is monitored in real time by a third pressure gauge 29 installed on the chamber 2, so as to determine whether the pressure inside the chamber 2 remains stable during the test.

[0070] Example 2

[0071] This embodiment discloses a specific implementation method for isobaric maintenance control in underwater compressed air energy storage tests. This method is based on the isobaric maintenance system in the underwater compressed air energy storage test in Embodiment 1. The method controls the inflation of the air bladder and the deflation of the air bladder through the air supply and exhaust device, and makes the air intake of the air bladder the same as the air exhaust of the air bladder, so as to ensure that the liquid discharge volume of the gas storage device remains unchanged and achieve the purpose of maintaining the liquid level height.

[0072] The isobaric maintenance control method for underwater compressed air energy storage tests specifically includes the following steps:

[0073] S1. Open the liquid supply assembly and close the drain assembly. The liquid supply assembly supplies liquid medium into the housing 2, causing the liquid medium to submerge the highest point of the partition 5, so that the two independent housing units can be interconnected.

[0074] S2. Open the first valve 15, the second valve 16, the fifth valve 19, the sixth valve 20, and the seventh valve 21, and close the third valve 17 and the fourth valve 18. Inflate the exhaust airbag through the air supply assembly until the exhaust airbag is full of gas. At this time, the exhaust airbag is in a full state, and the inflatable airbag is in a deflated state.

[0075] S3. Close the second valve 16 and the seventh valve 21, and open the third valve 17, the sixth valve 20, the fourth valve 18, and the fifth valve 19. Control the exhaust volume of the exhaust bag by controlling the opening of the third valve 17, and control the inflation volume of the inflation bag by controlling the opening of the fourth valve 18, so that the values ​​displayed by the first flow meter 13 and the second flow meter 14 are the same.

[0076] During step S3, the pressure inside the tank 2 is monitored in real time by a pressure detection component installed on the tank 2. The monitoring information from the pressure detection component is used to determine whether the water pressure inside the tank 2 remains constant. If the pressure detection component on the tank 2 detects a change in the water pressure inside the tank 2, and the values ​​displayed by the first flow meter 13 and the second flow meter 14 are different, it indicates that the inflation of the airbag and the deflation of the airbag are not at the same pressure. In this case, it is necessary to adjust the opening of the third valve 17 and the fourth valve 18 to maintain the water pressure inside the tank 2 consistent with the initial water pressure value.

[0077] A pressure holding test can also be performed between steps S2 and S3. After step S2, the specific pressure holding test method is as follows: close the second valve 16, the sixth valve 20, and the seventh valve 21 to prevent the gas in the exhaust bladder from escaping, and perform a pressure holding test to study the temperature and pressure conditions inside the exhaust bladder under pressure holding conditions.

[0078] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An isobaric maintenance system for underwater compressed air energy storage tests, characterized in that, include: An indoor liquid storage device containing a liquid medium; A gas storage device is installed inside the indoor liquid storage device; the gas storage device includes an inflatable airbag and an exhaust airbag. The air supply and exhaust device is connected to the inflatable airbag (3) and the exhaust airbag (4) respectively. The air supply and exhaust device controls the inflatable airbag to inflate and the exhaust airbag to exhaust. The air supply and exhaust device controls the air intake of the inflatable airbag to be the same as the air exhaust of the exhaust airbag, so as to ensure that the liquid discharge volume of the air storage device remains unchanged.

2. The isobaric maintenance system for underwater compressed air energy storage tests according to claim 1, characterized in that, The indoor liquid storage device includes a housing (2).

3. The isobaric maintenance system for underwater compressed air energy storage tests according to claim 2, characterized in that, The interior of the box (2) is provided with a partition (5) that divides the box (2) into two independent box units; the partition (5) is provided with a connection port (6) that can connect the two independent box units; the inflatable airbag and the deflatable airbag are respectively disposed inside one of the independent box units.

4. The isobaric maintenance system for underwater compressed air energy storage tests according to claim 2 or 3, characterized in that, The box (2) is a visual box enclosed by transparent glass.

5. The isobaric maintenance system for underwater compressed air energy storage tests according to claim 3, characterized in that, The inflatable airbag and the deflated airbag are suspended by a hanging line on a crossbeam (8) located above the box body (2).

6. The isobaric maintenance system for underwater compressed air energy storage tests according to claim 2, characterized in that, The air supply and exhaust device includes: An air supply component is connected to the inflatable airbag and the deflated airbag respectively, and is capable of inflating the inflatable airbag and the deflated airbag; A first gas supply pipe (9) is connected to the gas supply assembly; a first valve (15), a second valve (16) and a third valve (17) are sequentially provided on the first gas supply pipe (9); The second air supply pipe (10) is connected at one end to the middle of the first air supply pipe (9) located between the first valve (15) and the second valve (16), and at the other end to the inflatable airbag; the second air supply pipe (10) is provided with a fourth valve (18) and a fifth valve (19) in sequence; The third gas supply pipe (11) is connected at one end to the middle of the first gas supply pipe (9) located between the second valve (16) and the third valve (17), and at the other end to the exhaust air bag; a sixth valve (20) is provided on the third gas supply pipe (11); The fourth gas supply pipe (12) is connected at one end to the second gas supply pipe (10) located between the fourth valve (18) and the fifth valve (19), and at the other end to the outside atmosphere; the end of the first gas supply pipe (9) is connected to the middle of the fourth gas supply pipe (12); the fourth gas supply pipe (12) is provided with a seventh valve (21).

7. The isobaric maintenance system for underwater compressed air energy storage tests according to claim 6, characterized in that, The first gas pipe (9) is equipped with a first flow meter (13) for monitoring the gas flow rate on the first gas pipe (9); the fourth gas pipe (12) is equipped with a second flow meter (14) for monitoring the gas flow rate on the fourth gas pipe (12).

8. The isobaric maintenance system for underwater compressed air energy storage tests according to claim 6, characterized in that, Temperature detection components and pressure detection components are respectively installed on the second gas supply pipe (10), the third gas supply pipe (11) and the box (2).

9. The isobaric maintenance system for underwater compressed air energy storage tests according to claim 2, characterized in that, The upper side wall of the box (2) is provided with a liquid supply component for supplying liquid into the box (2); the bottom wall of the box (2) is connected to a drain component for discharging the liquid medium inside the box (2).

10. A method for maintaining pressure control in underwater compressed air energy storage tests, characterized in that, The method is based on the isobaric maintenance system for the compressed air energy storage underwater gas storage test according to any one of claims 1 to 9. The method controls the inflation of the air bladder and the deflation of the air bladder by the supply and exhaust device, and makes the air intake of the air bladder the same as the air exhaust of the air bladder, so as to ensure that the liquid discharge volume of the gas storage device remains unchanged and achieve the purpose of maintaining the liquid level height.

11. The isobaric maintenance control method for underwater compressed air energy storage tests according to claim 10, characterized in that, The method specifically includes the following steps: S1. Open the liquid supply assembly and close the drain assembly; supply liquid medium into the tank (2) through the liquid supply assembly, so that the liquid medium submerges the highest point of the partition (5); S2. Open the first valve (15), the second valve (16), the fifth valve (19), the sixth valve (20), and the seventh valve (21), and close the third valve (17) and the fourth valve (18). Inflate the exhaust airbag through the air supply assembly and fill the exhaust airbag with gas. At this time, the exhaust airbag is in a full state and the inflatable airbag is in a deflated state. S3. Close the second valve (16) and the seventh valve (21), and open the third valve (17), the sixth valve (20), the fourth valve (18), and the fifth valve (19). Control the exhaust volume of the exhaust bag by controlling the opening of the third valve (17), and control the inflation volume of the inflation bag by controlling the opening of the fourth valve (18), so that the values ​​displayed by the first flow meter (13) and the second flow meter (14) are the same. Furthermore, the pressure inside the tank (2) is monitored in real time by a pressure detection component installed on the tank (2) to ensure that the water pressure inside the tank (2) remains constant.

12. The isobaric maintenance control method for underwater compressed air energy storage tests according to claim 11, characterized in that, A pressure holding test is also performed between step S2 and step S3.

Images