Closed underwater compressed gas energy storage device for protection against seawater corrosion and marine biofouling

Abstract

The application provides a closed underwater compressed gas energy storage device capable of preventing seawater corrosion and marine organism adhesion, comprising a gas storage tank, a composite suction caisson foundation and a flexible water bag; the gas storage tank is provided with a platform and a flexible diaphragm; the platform is provided with a central pipeline and a peripheral gas pipeline in communication with the inside of the flexible diaphragm; the outer wall of the gas storage tank is provided with a wall-attached pipeline in communication with the peripheral gas pipeline; the lower part of the gas storage tank is symmetrically provided with two gas storage tank water inlets in communication with the working fluid storage area; the two sides of the gas storage tank are respectively provided with one flexible water bag; the flexible water bag comprises a water storage bag and a water pipeline; one end of the water pipeline is communicated to the water storage bag, and the other end is sealingly connected to the gas storage tank water inlet. The application solves the problems of seawater corrosion, marine organism adhesion, biological corrosion, structure damage and channel blockage of the underwater compressed gas energy storage device in seawater environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underwater energy storage, in particular, especially relates to a closed underwater compressed gas energy storage device capable of preventing seawater corrosion and marine organism attachment. BACKGROUND

[0002] As a clean and sustainable energy source, marine renewable energy has great potential to promote sustainable development. However, marine renewable energy faces many problems such as randomness, intermittency and low energy density in practical application. Combining marine renewable energy with marine energy storage technology is an effective way to solve this problem. Underwater compressed gas energy storage technology is one of the main technical ways of marine energy storage, which has stable working characteristics and high energy efficiency. However, due to the particularity of the marine environment, the underwater compressed gas energy storage device is exposed to seawater for a long time. After the contact of various dissolved oxygen, salts and microorganisms in seawater with the energy storage device, corrosion reaction occurs, forming corrosion products, which can easily cause damage and aging of the energy storage device. In addition to seawater corrosion, marine organism attachment is also one of the challenges faced by underwater compressed gas energy storage devices. Marine organisms include various algae, shellfish, etc., which can easily form biofilm, algal cover and shellfish attachment on the underwater energy storage device, which can easily cause biological corrosion, structural damage, channel blockage and other problems. SUMMARY

[0003] The underwater compressed gas energy storage device proposed above is prone to biological corrosion, structural damage, channel blockage and other problems caused by seawater corrosion and marine organism attachment in seawater environment. Therefore, a closed underwater compressed gas energy storage device capable of preventing seawater corrosion and marine organism attachment is proposed. The closed underwater compressed gas energy storage device capable of preventing seawater corrosion and marine organism attachment can protect the underwater compressed gas energy storage device from seawater corrosion and marine organism attachment, effectively prolong the service life of the underwater compressed gas energy storage device, and improve its performance and reliability in marine environment.

[0004] The technical means adopted by the present application are as follows:

[0005] A closed underwater compressed gas energy storage device capable of preventing seawater corrosion and marine organism attachment, comprising a gas storage tank, a composite suction caisson foundation and a flexible water bag.

[0006] The top of the gas storage tank is provided with a platform, and the inside is provided with a flexible diaphragm; the flexible diaphragm is fixedly installed at the edge of the platform, and the inside of the gas storage tank is divided into a compressed air storage area inside the flexible diaphragm and a working fluid storage area outside the flexible diaphragm;

[0007] The platform is provided with a central pipeline and a peripheral gas pipeline connected to the interior of the flexible diaphragm; a wall-adhering pipeline is installed on the outer wall of the gas storage tank, the peripheral gas pipeline is connected to the wall-adhering pipeline, and the other end of the wall-adhering pipeline is connected to an underwater gas pipeline network, and the underwater gas pipeline network is used to transport compressed gas to the interior of the flexible diaphragm or to transport compressed gas from the interior of the flexible diaphragm to the outside through the wall-adhering pipeline and the peripheral gas pipeline; two gas tank water outlets connected to the working fluid storage area are symmetrically provided at the lower part of the gas storage tank;

[0008] A flexible water bag is provided on each side of the gas tank, and the two flexible water bags are symmetrically arranged; the flexible water bag includes a water storage bag and a water transmission pipe; the water storage bag is a flat flexible water storage bag, and the working fluid is contained in the water storage bag; the flexible water bag can be placed above the seabed through the water storage bag; one end of the water transmission pipe is connected to the water storage bag, and the other end is sealed to the water inlet of the gas tank;

[0009] The gas storage tank is fixedly installed above the composite suction caisson foundation, and the composite suction caisson foundation is used to fix the gas storage tank on the seabed.

[0010] Furthermore, the flexible water bag and the air storage tank form a closed structure to prevent the entry of external seawater and marine life.

[0011] Furthermore, the sum of the volumes of the working fluid inside the two water storage bags is equal to or slightly larger than the volume of the gas storage tank.

[0012] Furthermore, the flexible diaphragm is used to store compressed gas and separate the compressed gas from the working fluid; after being inflated, the flexible diaphragm can fill the internal space of the gas storage tank.

[0013] Furthermore, a groove is provided on the lower side wall of the platform, and the edge of the flexible diaphragm is fixedly installed in the groove through an elastic clamp.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The closed underwater compressed gas energy storage device provided by the present invention is resistant to seawater corrosion and marine organism attachment. It improves the traditional open underwater compressed gas energy storage device. By providing a closed flexible water bag, it overcomes a series of problems of open underwater compressed gas energy storage devices exposed to seawater environment for a long time, such as susceptibility to seawater corrosion and marine organism attachment, causing biological corrosion, structural damage, and channel blockage. It effectively prolongs the life of the underwater energy storage device and improves its performance and reliability in the marine environment.

[0016] 2. The closed underwater compressed gas energy storage device provided by the application can avoid the problem of energy storage / energy release function failure caused by the accumulation of silt in the water inlet of the gas storage tank of the open underwater compressed gas energy storage device, which brings up the silt of seabed.

[0017] Based on the above reasons, the application can be widely applied in the field of underwater energy storage. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 The structural schematic diagram of the closed underwater compressed gas energy storage device for preventing seawater corrosion and marine organism attachment is shown.

[0020] Figure 2 The longitudinal sectional view of the closed underwater compressed gas energy storage device for preventing seawater corrosion and marine organism attachment is shown.

[0021] Figure 3 The structural schematic diagram of the composite suction caisson foundation is shown.

[0022] Figure 4 The structural schematic diagram of the gas storage tank is shown.

[0023] Figure 5 The longitudinal sectional view of the gas storage tank is shown.

[0024] Figure 6 The structural schematic diagram of the platform is shown.

[0025] Figure 7 The energy storage process schematic diagram of the closed underwater compressed gas energy storage device for preventing seawater corrosion and marine organism attachment is shown.

[0026] Figure 8 The energy release process schematic diagram of the closed underwater compressed gas energy storage device for preventing seawater corrosion and marine organism attachment is shown.

[0027] In the figure: 1, gas storage tank; 2, composite suction caisson foundation; 3, flexible water bag; 4, water storage bag; 5, water pipeline; 6, inner cylinder; 7, outer cylinder; 8, bulkhead plate; 9, peripheral gas pipeline; 10, central pipeline; 11, wall-hugging pipeline; 12, water inlet of gas storage tank; 13, flexible diaphragm; 14, elastic clamp; 15, platform; 16, pressure measuring port of inner cylinder; 17, water outlet port of inner cylinder; 18, pressure measuring port of outer cylinder; 19, water outlet port of outer cylinder; 20, groove. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0031] Unless specifically stated otherwise, the relative arrangement of the components and steps illustrated in these embodiments, numerical expressions, and numerical values are not meant to limit the scope of the present application. At the same time, it should be clear that the sizes of the various parts shown in the drawings are not drawn in proportion. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but in appropriate cases, the techniques, methods and devices should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0032] In the description of the present application, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0033] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The devices can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0034] In addition, it should be noted that the use of the words "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0035] Example 1

[0036] As Figures 1-6 shown, the present application provides a closed underwater compressed gas energy storage device resistant to seawater corrosion and marine biofouling, comprising a gas storage tank 1, a composite suction caisson foundation 2 and a flexible water bag 3;

[0037] The gas storage tank 1 is a cylindrical tank with a dome with a length-diameter ratio less than 1, and the wall thickness is increased compared with that of a traditional gas storage tank;

[0038] The top of the gas storage tank 1 is provided with a platform 15, and the inside is provided with a flexible diaphragm 13; the edge of the flexible diaphragm 13 is fixedly installed on the platform 15, dividing the inside of the gas storage tank 1 into a compressed air storage area inside the flexible diaphragm 13 and a working fluid storage area outside the flexible diaphragm 15;

[0039] The platform 15 is provided with a central pipeline 10 and a peripheral gas pipeline 9 which are in communication with the inside of the flexible diaphragm 13; the central pipeline 10 extends into the inside of the flexible diaphragm 13 and into the lower part of the gas storage tank 1; the central pipeline 10 has two functions, including: helping the flexible diaphragm 13 to better stretch out during the delivery of compressed gas, preventing the internal gas storage volume from being reduced or even damaging the flexible diaphragm 13 due to the wrinkles of the flexible diaphragm 13; when the compressed gas reaches the pressure dew point and precipitates moisture to accumulate at the bottom of the flexible diaphragm 13, the liquid accumulated at the bottom of the flexible diaphragm 13 can be removed in time by connecting a micro water pump to the central pipeline 10;

[0040] The gas storage tank 1 is provided with a wall-attached pipeline 11 on the outer wall, the peripheral gas pipeline 9 is in communication with the wall-attached pipeline 11, and the other end of the wall-attached pipeline 11 is connected to an underwater gas pipeline network, which is used to deliver compressed gas to the inside of the flexible diaphragm 13 through the wall-attached pipeline 11 and the peripheral gas pipeline 9 or deliver compressed gas from the inside of the flexible diaphragm 13 to the outside; the lower part of the gas storage tank 1 is symmetrically provided with two gas storage tank water outlets 12 which are in communication with the working fluid storage area;

[0041] The gas storage tank 1 is provided with one flexible water bag 3 on each side, and the two flexible water bags 3 are symmetrically arranged; the flexible water bag 3 includes a water storage bag 4 and a water pipeline 5; the water storage bag 4 is a flat flexible water storage bag, and the inside of the water storage bag 4 is filled with working fluid, such as seawater or freshwater; the flexible water bag 3 can be placed above the seabed through the water storage bag 4; one end of the water pipeline 5 is in communication with the water storage bag 4, and the other end is sealingly connected to the gas storage tank water outlet 12;

[0042] The gas storage tank water outlet 12 is used to make the working fluid in the flexible water bag 3 flow into or out of the gas storage tank 1; the working fluid in the water storage bag 4 can flow into or out of the gas storage tank 1 through the water pipeline 5 and the gas storage tank water outlet 12 in sequence to complete the energy release / storage process;

[0043] The flexible diaphragm 13 can be compressed and expanded in an isobaric process, which is beneficial to the system elements working in their optimal efficiency range and improving the system energy storage efficiency. At the same time, the compressed gas and working fluid stored in the flexible diaphragm 13 can be fully exchanged through the wall of the flexible diaphragm 13, and the compression and expansion of the gas in the flexible diaphragm 13 is close to an isothermal process, which is also beneficial to improving the system efficiency.

[0044] The gas tank 1 is fixedly installed above the composite suction caisson foundation 2, and the composite suction caisson foundation 2 is used to fix the gas tank 1 on the seabed.

[0045] Further, the flexible water bag 3 and the gas tank 1 form a closed structure to prevent external seawater and marine organisms from entering.

[0046] Further, the sum of the volumes of the working fluids in the two water storage bags 4 is equal to or slightly greater than the volume of the gas tank 1.

[0047] Further, the flexible diaphragm 13 is used to store compressed gas and separate compressed gas and working fluid; the flexible diaphragm 13 can fill the internal space of the gas tank 1 after being inflated.

[0048] Further, the platform 15 is provided with a groove 20 on the lower side wall, and the flexible diaphragm 13 is fixedly installed on the groove 20 through an elastic clamp 14.

[0049] Further, the composite suction caisson foundation 2 includes an inner cylinder 6 and an outer cylinder 7; the gas tank 1 is fixedly installed above the outer cylinder 7; the inner cylinder 6 and the outer cylinder 7 can provide anchoring force for the gas tank 1 above when subjected to external load disturbance after being installed in place;

[0050] The inner cylinder 6 is a cylindrical structure with an open bottom, and the inner cylinder 7 is provided with a partition plate 8 in the axial direction inside, which is used to divide the inner cylinder 6 into three compartments; the partition plate 8 is used as a reinforcing rib to improve the structural strength of the inner cylinder 6, so as to resist the axial compression force and the suction force at the top of the composite suction caisson foundation 2 during installation, and improve the buckling stability of the cylinder wall of the inner cylinder 6.

[0051] The outer cylinder 7 is a cylinder structure with a closed top and an open bottom, the inner cylinder 6 is located inside the outer cylinder 7 and is fixedly installed on the top sealing surface of the outer cylinder 7, the top sealing surface of the outer cylinder 7 is provided with an outer cylinder pressure measuring port 18 and an outer cylinder water pumping port 19 which are in communication with the inside of the outer cylinder 7, and at positions corresponding to the three chambers inside the inner cylinder 6, an inner cylinder pressure measuring port 16 and an inner cylinder water pumping port 17 which are in communication with the corresponding chambers are respectively provided.

[0052] Further, the wall thickness of the gas storage tank 1 is 150-600mm, the deeper the installation water depth, the thicker the wall thickness; according to the production regulations of QB / HQ6539-2007 "Simple Steel Pressure Vessel", the thickness of the cylinder of the gas storage tank is not less than 4.5~5mm, the wall thickness of the gas storage tank provided by the application is increased by about 30-120 times compared with the traditional pressure vessel, which can improve the self gravity to provide sufficient tensile / compressive strength and additional gravity ballast, and to a certain extent, the geometric size of the composite suction caisson foundation can be reduced, and the additional sinking force is provided by the self gravity during the installation and sinking of the composite suction caisson foundation 2 to overcome the resistance of the soil to the tip of the inner cylinder 6 and the outer cylinder 7 during the sinking process.

[0053] Further, the gas storage tank 1 adopts a concrete structure, which is low in cost, corrosion-resistant, one-time forming, and good in overall performance, while the traditional gas storage tank adopts a steel structure, which is high in production cost, easy to corrode, and usually formed into a whole by welding, and the overall performance of the structure is not good.

[0054] Further, when the composite suction caisson foundation 2 falls onto the seabed in the sea: the inner cylinder pressure measuring port 16 is used to monitor the pressure inside the corresponding chamber in real time by inserting a pressure gauge into the corresponding chamber during the installation of the composite suction caisson foundation 2; the inner cylinder water pumping port 17 is used to suck the seawater in the corresponding chamber by connecting an external water pumping device to form negative pressure in the corresponding chamber, thereby controlling the sinking installation of the composite suction caisson foundation 2 to a specified depth;

[0055] The three chambers inside the inner cylinder 6 are provided with corresponding inner cylinder pressure measuring ports 16 and inner cylinder water pumping ports 17, which are used to control the levelness of the composite suction caisson foundation 2 during installation by individually controlling the pressure difference in each chamber, to prevent the composite suction caisson foundation 2 from tilting.

[0056] Further, the top sealing surface of the outer cylinder 7 is provided with two outer cylinder pressure measuring ports 18 and two outer cylinder water pumping ports 19.

[0057] Further, when the composite suction caisson foundation 2 falls on the seabed in the sea, the outer cylinder pressure measuring port 18 is used to monitor the pressure inside the outer cylinder 7 in real time by inserting a pressure gauge into the inside of the outer cylinder 7 during installation of the composite suction caisson foundation 2; the outer cylinder water pumping port 19 is used to pump seawater in the outer cylinder 7 by connecting external water pumping equipment during installation of the composite suction caisson foundation 2, so that negative pressure is formed in the outer cylinder 7, thereby controlling the sinking installation of the composite suction caisson foundation 2 to a specified depth.

[0058] Further, the diameter of the outer cylinder 7 is greater than the diameter of the inner cylinder 6, and the length of the outer cylinder 7 is less than the length of the inner cylinder 6, thereby providing sufficient horizontal bearing capacity and overturning resistance when the upper gas tank 1 is subjected to strong horizontal load, and providing the closed underwater compressed gas energy storage device for preventing seawater corrosion and marine organism attachment from seawater scouring protection.

[0059] Further, the gas tank 1, the inner cylinder 6 and the outer cylinder 7 are coaxially arranged.

[0060] Further, the bulkhead plate 8 is a herringbone structure.

[0061] Further, the anchoring force of the closed underwater compressed gas energy storage device for preventing seawater corrosion and marine organism attachment is composed of the self-weight of the gas tank 1, the self-weight of the composite suction caisson foundation 2 and the bearing capacity of the composite suction caisson foundation 2.

[0062] In operation, first, the inside of the water storage bag 4 is filled with working fluid, and the water conveying pipeline 5 is sealingly connected to the gas tank water inlet 12; then the closed underwater compressed gas energy storage device is placed in the sea, seawater is filled into the inside of the inner cylinder 6 and the outer cylinder 7, and after the composite suction caisson foundation 2 falls on the seabed, the seawater in the inside of the inner cylinder 6 and the outer cylinder 7 is pumped out, so that the composite suction caisson foundation 2 sinks to the position where the inner cylinder 6 and the outer cylinder 7 are installed on the seabed; the inner cylinder 6 and the outer cylinder 7 are used to provide anchoring force for the gas tank 1 when subjected to external load disturbance after the composite suction caisson foundation 2 is installed in place;

[0063] The closed underwater compressed gas energy storage device for preventing seawater corrosion and marine organism attachment has energy storage process and energy release process.

[0064] Energy storage process:

[0065] As Figure 7As shown, the entire device is installed on the seabed, and the space between the interior of the gas tank 1 and the exterior of the flexible diaphragm 13 is filled with the working fluid that enters from the water bag 4 in sequence through the water pipe 5 and the gas tank water outlet 12, and then the compressed gas with a certain pressure is allowed to enter the flexible diaphragm 13 in sequence through the wall-adhering pipe 11 and the peripheral gas pipe 9, and the flexible diaphragm 13 begins to expand and stretch. As the gas storage process proceeds, the volume of the flexible diaphragm 13 continues to increase and gradually stretches toward the bottom of the gas tank 1; during this process, the working fluid in the gas tank 1 is gradually discharged to the water bag 4 through the gas tank water outlet 12 and the water pipe 5 in sequence. During the gas storage process, the pressure of the compressed gas in the flexible diaphragm 13 remains constant until the flexible diaphragm 13 is fully stretched and fills the internal space of the gas tank 1. At the same time, all the working fluid returns to the flexible water bag 3 and fills the entire flexible water bag 3;

[0066] Energy release process:

[0067] like Figure 8 As shown, when the outside world needs it, the compressed gas stored in the flexible diaphragm 13 flows out through the peripheral gas pipeline 9. As the volume of the compressed gas decreases, the working fluid in the water storage bag 4 continuously flows into the gas tank 1 through the water pipeline 5 and the gas tank water port 12 in turn. During the exhaust process, the gas pressure inside the flexible diaphragm 13 remains constant until all the compressed gas inside the flexible diaphragm 13 is discharged, and the working fluid refills the space between the inside of the gas tank 1 and the outside of the flexible diaphragm 13. The above is a complete working cycle.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A closed underwater compressed gas energy storage device that is resistant to seawater corrosion and marine organism attachment, characterized in that: It includes air storage tank, composite suction caisson foundation and flexible water bladder; The gas storage tank is provided with a platform on the top and a flexible diaphragm inside; the edge of the flexible diaphragm is fixedly mounted on the platform, dividing the interior of the gas storage tank into a compressed air storage area located inside the flexible diaphragm and a working fluid storage area located outside the flexible diaphragm; The platform is provided with a central pipeline and a peripheral gas pipeline connected to the interior of the flexible diaphragm; a wall-adhering pipeline is installed on the outer wall of the gas storage tank, the peripheral gas pipeline is connected to the wall-adhering pipeline, and the other end of the wall-adhering pipeline is connected to an underwater gas pipeline network, and the underwater gas pipeline network is used to transport compressed gas to the interior of the flexible diaphragm or to transport compressed gas from the interior of the flexible diaphragm to the outside through the wall-adhering pipeline and the peripheral gas pipeline; two gas tank water outlets connected to the working fluid storage area are symmetrically provided at the lower part of the gas storage tank; A flexible water bag is provided on each side of the gas tank, and the two flexible water bags are symmetrically arranged; the flexible water bag includes a water storage bag and a water transmission pipe; the water storage bag is a flat flexible water storage bag, and the working fluid is contained in the water storage bag; the flexible water bag can be placed above the seabed through the water storage bag; one end of the water transmission pipe is connected to the water storage bag, and the other end is sealed to the water inlet of the gas tank; The gas storage tank is fixedly installed above the composite suction caisson foundation, and the composite suction caisson foundation is used to fix the gas storage tank on the seabed; The flexible water bag and the air storage tank form a closed structure to prevent the entry of external seawater and marine life; The sum of the volumes of the working fluids in the two water storage bags is equal to or slightly larger than the volume of the gas storage tank.

2. The closed underwater compressed gas energy storage device resistant to seawater corrosion and marine organism attachment according to claim 1 is characterized in that: The flexible diaphragm is used to store compressed gas and separate the compressed gas from the working fluid; after being inflated, the flexible diaphragm can fill the internal space of the gas storage tank.

3. The closed underwater compressed gas energy storage device resistant to seawater corrosion and marine organism attachment according to claim 1 is characterized in that: A groove is provided on the lower side wall of the platform, and the edge of the flexible diaphragm is fixedly installed in the groove through an elastic clamp.

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