Underwater compressed air energy storage system and storage method thereof

Abstract

The invention relates to the technical field of ocean engineering energy storage, in particular to an underwater compressed air energy storage system and a storage method thereof.The underwater compressed air energy storage system comprises an energy storage device arranged in a deepwater area and located at the water bottom of the set depth, the energy storage device comprises an energy storage cover cylinder, and a collapsible flexible air storage bag is arranged in the energy storage cover cylinder; a pressure carrier is arranged above the flexible air storage bag, the flexible air storage bag is subjected to the hydrostatic pressure effect of the set depth, and underwater compressed air energy storage can serve as an effective supplement of a traditional compressed air storage method through the hydrostatic pressure characteristic of a water body and can serve as a low-cost replacement of the traditional compressed air storage method in marine environment application and other scenes. The energy storage cover cylinder is provided with a constant-pressure channel for water to flow in and out, the flexible air storage bag is provided with an energy storage and release pipeline, the energy storage and release pipeline penetrates through the energy storage cover cylinder to be connected with an external system, compressed air is stored in the underwater air storage device, the pressure inside and outside the air storage device is balanced through the static pressure of water, and therefore efficient and safe energy storage is achieved.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering energy storage technology, and in particular to an underwater compressed air energy storage system and a storage method thereof. Background Art

[0002] With the rapid development of renewable energy, energy storage technology has become the key to solving the problems of energy intermittency and instability. Compressed air energy storage (CAES), as an effective energy storage technology, has the advantages of large capacity, low cost and environmental friendliness. Traditional methods usually require high-strength steel gas tanks and underground salt caverns to store high-pressure compressed air, which leads to large land area, high construction cost, safety hazards, limited site selection and other problems. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an underwater compressed air energy storage system and a storage method thereof, which utilizes the hydrostatic pressure of the water body to balance the pressure of the compressed air, thereby reducing the structural strength requirements of the flexible air storage tank, and can provide constant pressure output and improve energy storage and conversion efficiency.

[0004] The technical problem to be solved by the present invention is achieved through the following technical solutions: an underwater compressed air energy storage system, comprising an energy storage device arranged in deep water and located at the bottom of a set depth, the energy storage device comprising an energy storage cover, a collapsible flexible air storage bag arranged in the energy storage cover, a ballast body arranged above the flexible air storage bag, the flexible air storage bag being subjected to the hydrostatic pressure of the set depth, a constant pressure channel for water in and out being arranged on the energy storage cover, an energy storage and release pipeline being arranged on the flexible air storage bag, the energy storage and release pipeline passing through the energy storage cover to connect to an external system, the external system injecting compressed air of constant pressure into the flexible air storage bag through the energy storage pipeline, the compressed air pressure inside the flexible air storage bag and the hydrostatic pressure of the water body outside the flexible air storage bag are always kept in balance, the flexible air storage bag continuously and freely expands to store compressed air during the energy storage process, and the compressed air in the flexible air storage bag is released back to the external system for energy recovery. By storing compressed air in an underwater air storage device, the pressure inside and outside the air storage device is balanced by the static pressure of the water body, thereby achieving efficient and safe energy storage. During the gas storage and release process, the static pressure of the water body is used as a natural constraint of the gas storage bag, reducing the requirements for the material strength of the gas storage device; moreover, the flexible gas storage bag has a large energy storage capacity, simple parallel expansion, and fast response speed, making it suitable for large-scale energy storage applications.

[0005] Since the gas storage pressure is equal to the hydrostatic pressure at the depth of the installation location, the pressure of the output compressed air is a constant value, which greatly improves the energy conversion efficiency. The water environment temperature is relatively stable, which can reduce the heat loss during compression and expansion, improve energy conversion efficiency and improve energy storage efficiency. In addition, during the energy storage process, it is clean and environmentally friendly, reduces the occupation of ground space, and the system is safe and reliable to use.

[0006] As a further solution of the present invention, the external system includes an energy storage system and a power generation system arranged in parallel, the energy storage system and the power generation system are both connected to the energy storage and release pipeline, the energy storage system is connected to the energy storage and release pipeline through an air intake pipeline, an air intake valve is provided on the air intake pipeline, and the power generation system is connected to the power generation system through an air outlet pipeline, an air outlet valve is provided on the air outlet pipeline. The energy storage system and the power generation system share the energy storage and release pipeline, which effectively saves costs and simplifies equipment installation.

[0007] As a further solution of the present invention, the energy storage cover tube of the energy storage device is a rigid outer cover tube made of a high-strength and corrosion-resistant material, and two groups of lifting ears are symmetrically arranged on the top of the rigid outer cover tube. A middle partition is arranged in the middle of the rigid outer cover tube, and the middle partition divides the rigid outer cover tube into a loading chamber and an energy storage chamber arranged from top to bottom. The ballast body is arranged in the loading chamber, and the flexible air storage bag is positively suspended in the energy storage chamber. The energy storage chamber is filled with water and compressed air in the flexible air storage bag in any proportion, and the water enters and exits through a constant pressure channel. The constant pressure channel ensures that the water flows smoothly during the energy storage process and avoids unstable performance due to pressure fluctuations. During the energy release and energy storage process, the water can enter and exit freely, and maintain a constant pressure during the energy storage and release process, which helps to improve the working stability and efficiency of the system. The middle partition effectively supports the ballast body and divides the loading chamber and the energy storage chamber into two independent spaces.

[0008] As a further solution of the present invention, the ballast body is composed of a plurality of evenly distributed counterweights, and the mass of the ballast body is not less than the mass of the flexible air storage bag filled with compressed gas. When the flexible air storage bag is affected by the compressed gas, the counterweight provides necessary support through gravity, ensuring that the entire device can withstand greater external forces or pressure fluctuations and is not easily damaged or failed.

[0009] As a further solution of the present invention, the constant pressure channel includes a plurality of water inlet and outlet holes arranged at the lower part of the rigid outer cover tube body, and the water inlet and outlet holes are arranged along the circumference of the rigid outer cover tube. When the flexible air storage bag takes in air, the water in the energy storage cavity is output through the water inlet and outlet holes, and when the flexible air storage bag exhausts air, the water in the energy storage cavity is input through the water inlet and outlet holes. Effectively balancing the flow of water in the energy storage cavity helps to maintain a constant water pressure and improve the stability and reliability of the system.

[0010] As a further solution of the present invention, the wall of the rigid outer cover tube is also provided with a connecting hole, and the energy storage and release pipeline passes through the corresponding connecting hole and extends to the outside of the rigid outer cover tube. The energy storage and release pipeline is a rigid pipeline, and the free end of the energy storage and release pipeline is connected to the ocean delivery pipe through a matching connecting flange, and the top of the ocean delivery pipe is connected in parallel with the air inlet pipeline and the air outlet pipeline. The connection with the ocean delivery pipe through the matching connecting flange enhances the reliability and sealing of the connection, and ensures that the pipeline does not leak or loosen during the energy release process. Only the ocean delivery pipe is set in the water for gas input and output, so as to more effectively transmit and release the stored energy.

[0011] As a further solution of the present invention, a safety valve port and an air inlet and outlet are provided on the top of the flexible air storage bag, and a safety valve is provided at the safety valve port; the safety valve effectively prevents excessive internal pressure of the system and avoids damage or leakage of the air storage bag when the pressure is too high.

[0012] The first flange is provided at the air inlet and outlet, and the energy storage and release pipeline extends upward along the inner wall of the rigid outer cover tube to the bottom of the middle partition. The energy storage and release pipeline is provided with a second flange that is matched with the first flange. The flange connection ensures a sealed connection between the pipelines, and the connection is reliable and stable, effectively preventing leakage and falling off.

[0013] As a further solution of the present invention, the flexible air storage bag is made of a flexible composite material formed by double-sided coating of high-strength fiber-reinforced polyurethane, and the flexible air storage bag is spherical, cylindrical or ellipsoidal. The flexible air storage bag is light and easy to transport and carry. Different spatial shapes better adapt to various installation environments and storage requirements. Polyurethane material has good high and low temperature resistance, corrosion resistance and aging resistance, and can be used for a long time in various harsh environments. Parallel expansion is simple and the response speed is fast, which is suitable for large-scale energy storage applications.

[0014] As a further solution of the present invention, the energy storage system includes a high-efficiency compressor, which compresses the air to a predetermined pressure, opens the air inlet valve, and inputs the compressed air into the flexible air storage bag along the air inlet pipeline; the power generation system includes an air turbine generator, and the compressed air is transported to the air turbine generator along the air outlet pipeline, and electricity is generated by the air turbine generator. The high-efficiency compressor can efficiently compress the air to a predetermined pressure, and the density of compressed air storage and the energy efficiency of the energy storage system. The flexible air storage bag effectively stores a large amount of compressed air, fully utilizes the space, and reduces the floor space of the gas storage facility. The air turbine generator uses the expansion energy of the compressed air to drive the generator rotor to generate electricity, realize clean and stable energy conversion, reduce dependence on traditional energy, and provide a stable power supply when demand changes.

[0015] As a further solution of the present invention, a storage method for removing marine hoses using buoyancy bladders is provided, which is used in an underwater compressed air energy storage system. The mass of the flexible air storage bag filled with compressed air is calculated, and the mass of the ballast body is not less than the mass of the flexible air storage bag filled with compressed air. By using the balance between the flexible air storage bag and the underwater hydrostatic pressure, compressed air can be efficiently stored in deeper waters, and the natural pressure of the underwater environment is utilized to reduce dependence on external mechanical devices, thereby improving the stability and efficiency of the energy storage system.

[0016] The flexible air storage bag realizes large-scale compressed air storage in an underwater environment without occupying a large amount of land space, avoiding the high cost and land occupation of ground facilities. The ballast body avoids the problem of tilting or floating of the flexible air storage bag due to unstable buoyancy underwater, and enhances the safety and stability of the flexible air storage bag.

[0017] Select appropriate waters, preset the diving depth of the energy storage device, calculate the hydrostatic pressure at the set depth, ensure that the water depth is sufficient to provide the required hydrostatic pressure, and the energy storage system compresses the air to a predetermined pressure. The compressed air at a constant pressure is input into the flexible air storage bag through the energy storage pipeline. The static pressure of the water body at the depth of the flexible air storage bag and the compressed air pressure in the flexible air storage bag reach a state of equilibrium, and the compressed air is stored at a constant pressure. The main energy used by the system is compressed air, which is clean and low-carbon during the energy storage and release process. Effectively utilize underwater space, reasonably select waters and set appropriate diving depths, and make full use of the hydrostatic pressure in deep water areas to store air at a stable constant pressure.

[0018] When energy is needed, the compressed air in the flexible air storage bag is transported to the power generation system through the energy release pipeline, converting mechanical energy into electrical energy for use. By flexibly adjusting the amount of compressed air released, the output power is dynamically adjusted according to the needs of the power grid to provide a stable power supply. During periods of large fluctuations in power demand, continuous and stable power output can be guaranteed, enhancing the reliability of the power grid.

[0019] The beneficial effects of the present invention are as follows: the present invention provides an underwater compressed air energy storage system and a storage method thereof, comprising an energy storage device arranged in deep water and located at the bottom of water at a set depth, the energy storage device comprising an energy storage cover, a collapsible flexible air storage bag is arranged in the energy storage cover, a ballast body is arranged above the flexible air storage bag, the flexible air storage bag is subjected to the hydrostatic pressure of the set depth, and the underwater compressed air energy storage utilizes the hydrostatic pressure characteristics of the water body, which can be an effective supplement to the traditional compressed air storage method, and can be a low-cost alternative to the traditional compressed air storage method in scenarios such as marine environment applications.

[0020] The energy storage cover is provided with a constant pressure channel for water in and out, and the flexible air storage bag is provided with an energy storage and release pipeline, which passes through the energy storage cover to connect to the external system. By storing compressed air in the underwater air storage device, the static pressure of the water body is used to balance the pressure inside and outside the air storage device, thereby achieving efficient and safe energy storage. In the process of air storage and release, the static pressure of the water body is used as a natural constraint of the air storage bag, which reduces the requirements for the material strength of the air storage device; and the flexible air storage bag has a large energy storage capacity, simple parallel expansion, and fast response speed, which is suitable for large-scale energy storage applications.

[0021] Since the gas storage pressure is equal to the hydrostatic pressure at the depth of the installation location, the pressure of the output compressed air is a constant value, which greatly improves the energy conversion efficiency. The water environment temperature is relatively stable, which reduces the heat loss during compression and expansion, improves the energy conversion efficiency and improves the energy storage efficiency. In addition, during the energy storage process, it is clean and environmentally friendly, reduces the occupation of ground space, and the system is safe and reliable to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the energy storage device of the present invention;

[0023] Figure 2 It is a schematic diagram of the system structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the internal structure of the energy storage cover cylinder of the present invention.

[0025] Among them: 1-energy storage cover, 101-loading chamber, 102-energy storage chamber, 2-middle partition, 3-ballast body, 4-flexible air storage bag, 401-first flange, 402-safety valve, 5-lifting ear, 6-energy storage and release pipeline, 601-connecting flange, 602-ocean transmission pipe, 603-air outlet pipeline, 631-air outlet valve, 632-power generation system, 604-air inlet pipeline, 641-air inlet valve, 642-energy storage system, 7-constant pressure channel. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] Example 1

[0030] like Figure 1 As shown, an underwater compressed air energy storage system includes an energy storage device arranged in deep water and located at a set depth of water bottom, the water depth of the energy storage device is pre-calculated, the energy storage device includes an energy storage cover 1, a collapsible flexible air storage bag 4 is arranged in the energy storage cover, the flexible air storage bag is made of a flexible composite material formed by double-sided coating of high-strength fiber-reinforced polyurethane, and the flexible air storage bag is spherical, cylindrical or ellipsoidal. Flexible air storage bags of different shapes are selected according to different use states and use environments.

[0031] A ballast body 3 is provided above the flexible air storage bag. The ballast body is composed of a number of evenly distributed counterweight blocks. The mass of the ballast body is not less than the mass of the flexible air storage bag 4 filled with compressed gas. The mass of the flexible air storage bag fully filled with compressed gas is first simulated and calculated, and then the number of counterweight blocks is calculated based on the mass of the actual counterweight blocks.

[0032] The energy storage cover 1 of the energy storage device is a rigid outer cover made of high-strength and corrosion-resistant material. Two sets of lifting ears 5 are symmetrically arranged on the top of the rigid outer cover, which are tied to the lifting ears through external traction ropes. The offshore operating ship continuously lowers the rigid outer cover into the seabed through the traction ropes.

[0033] A middle partition 2 is provided in the middle of the rigid outer cover tube, which divides the rigid outer cover tube into a loading chamber 101 and an energy storage chamber 102 arranged from top to bottom. The middle partition 2 effectively supports the ballast body, and divides the loading chamber and the energy storage chamber into two independent spaces. The ballast body is arranged in the loading chamber, and a certain number of counterweights are arranged on the middle partition. The counterweights provide necessary support through gravity, ensuring that the entire device can withstand greater external forces or pressure fluctuations.

[0034] The flexible air storage bag 4 is positively suspended in the energy storage cavity. The energy storage cavity is filled with water and compressed air in the flexible air storage bag in any proportion. The water enters and exits through the constant pressure channel. The flexible air storage bag is subjected to the hydrostatic pressure of a set depth. The energy storage cover is provided with a constant pressure channel 7 for water in and out. The constant pressure channel includes a plurality of water inlet and outlet holes arranged at the lower part of the rigid outer cover body. The water inlet and outlet holes are arranged along the circumference of the rigid outer cover. When the flexible air storage bag is inhaled, the water in the energy storage cavity is discharged through the water inlet and outlet holes. When the flexible air storage bag is discharged, the water in the energy storage cavity is input through the water inlet and outlet holes.

[0035] The flexible air storage bag is provided with an energy storage and release pipeline 6, and the wall of the rigid outer cover tube is also provided with a connecting hole. The energy storage and release pipeline passes through the corresponding connecting hole and extends to the outside of the rigid outer cover tube. The energy storage and release pipeline is a rigid pipeline. The top of the flexible air storage bag is provided with an air inlet and outlet, and a first flange 401 is provided at the air inlet and outlet. The energy storage and release pipeline extends upward along the inner wall of the rigid outer cover tube to the bottom of the middle partition. A second flange matched with the first flange is provided on the energy storage and release pipeline. The flange connection ensures a sealed connection between the pipelines, and the connection is reliable and stable, effectively preventing leakage and falling off.

[0036] The free end of the energy storage and release pipeline is connected to the ocean delivery pipe through a matching connection flange 601 , and the top of the ocean delivery pipe is connected in parallel with the air inlet pipeline 604 and the air outlet pipeline 603 .

[0037] The energy storage and release pipeline passes through the energy storage cover tube to connect to the external system, and the external system includes an energy storage system 642 and a power generation system 632 arranged in parallel. Both the energy storage system and the power generation system are connected to the energy storage and release pipeline. The energy storage system is connected to the energy storage and release pipeline through an intake pipeline 604, and an intake valve 641 is provided on the intake pipeline.

[0038] When in use, the air inlet valve 641 is opened, the energy storage system 642 includes a high-efficiency compressor, and the external system injects compressed air of constant pressure into the flexible air storage bag through the energy storage pipeline. The high-efficiency compressor compresses the air to a predetermined pressure, and the compressed air is input into the flexible air storage bag along the air inlet pipeline 604;

[0039] The compressed air pressure inside the flexible air storage bag 4 is always balanced with the hydrostatic pressure of the water body outside the flexible air storage bag, and the flexible air storage bag continuously and freely expands to store compressed air during the energy storage process.

[0040] The storage method of removing the marine hose using a buoyancy bladder is used in an underwater compressed air energy storage system. The mass of the flexible air storage bag filled with compressed air is calculated, and the mass of the ballast body is not less than the mass of the flexible air storage bag 4 filled with compressed air. The natural pressure of the underwater environment is utilized to realize large-scale compressed air storage in the underwater environment, and the flexible air storage bag stores compressed gas safely and stably.

[0041] Select a suitable water area, preset the diving depth of the energy storage device, calculate the hydrostatic pressure at the set depth, ensure that the water depth is sufficient to provide the required hydrostatic pressure, and the energy storage system compresses the air to a predetermined pressure. The compressed air at a constant pressure is input into the flexible air storage bag 4 through the energy storage pipeline. The hydrostatic pressure of the water body at the depth where the flexible air storage bag is located and the compressed air pressure in the flexible air storage bag reach a balanced state, and the compressed air is stored at a constant pressure;

[0042] Example 2

[0043] The power generation system is connected to the power generation system 632 through the outlet pipeline 603, and the outlet pipeline 603 is provided with an outlet valve 631. The compressed air in the flexible air storage bag 4 is released back to the external system for energy recovery. The power generation system 632 includes an air turbine generator, and the compressed air is transported to the air turbine generator along the outlet pipeline to generate electricity through the air turbine generator.

[0044] When energy is needed, the air inlet valve 641 is opened, and the compressed air in the flexible air storage bag 4 is transported to the power generation system 632 through the energy release pipeline, and the mechanical energy is converted into electrical energy for use. By flexibly adjusting the amount of compressed air released, the output power is dynamically adjusted according to the needs of the power grid to provide a stable power supply. During periods of large fluctuations in power demand, continuous and stable power output can be guaranteed.

[0045] Example 3

[0046] A safety valve port is provided at the top of the flexible air storage bag, and a safety valve 402 is provided at the safety valve port; when the internal pressure of the system is too high, the air storage bag is damaged or leaks.

[0047] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An underwater compressed air energy storage system, characterized in that: The invention comprises an energy storage device which is arranged in a deep water area and is located at the bottom of a water body at a set depth. The energy storage device comprises an energy storage cover (1). A collapsible flexible air storage bag (4) is arranged inside the energy storage cover. A ballast body (3) is arranged above the flexible air storage bag. The flexible air storage bag is subjected to the hydrostatic pressure of the set depth. A constant pressure channel (7) for water inlet and outlet is arranged on the energy storage cover. An energy storage and release pipeline (6) is arranged on the flexible air storage bag. The energy storage and release pipeline passes through the energy storage cover and is connected to an external system. The external system injects compressed air of constant pressure into the flexible air storage bag through the energy storage pipeline. The compressed air pressure inside the flexible air storage bag is always balanced with the hydrostatic pressure of the water body outside the flexible air storage bag. The flexible air storage bag continuously expands freely during the energy storage process to store compressed air. The compressed air in the flexible air storage bag is released back to the external system for energy recovery.

2. The underwater compressed air energy storage system according to claim 1, characterized in that: The external system comprises an energy storage system (642) and a power generation system (632) arranged in parallel, the energy storage system and the power generation system are both connected to the energy storage and release pipeline (6), the energy storage system is connected to the energy storage and release pipeline via an air intake pipeline (604), an air intake valve (641) is provided on the air intake pipeline, and the power generation system is connected to the power generation system via an air outlet pipeline (603), an air outlet valve (631) is provided on the air outlet pipeline.

3. The underwater compressed air energy storage system according to claim 2, characterized in that: The energy storage cover tube (1) of the energy storage device is a rigid outer cover tube made of a high-strength and corrosion-resistant material. Two groups of lifting ears (5) are symmetrically arranged on the top of the rigid outer cover tube. A middle partition (2) is arranged in the middle of the rigid outer cover tube. The middle partition divides the rigid outer cover tube into a loading chamber (101) and an energy storage chamber (102) arranged from top to bottom. The ballast body is arranged in the loading chamber. The flexible air storage bag is positively suspended in the energy storage chamber. The energy storage chamber is filled with water and compressed air in the flexible air storage bag in any proportion. The water enters and exits through a constant pressure channel.

4. The underwater compressed air energy storage system according to claim 3, characterized in that: The ballast body is composed of a plurality of evenly distributed counterweight blocks, and the mass of the ballast body is not less than the mass of the flexible air storage bag filled with compressed gas.

5. The underwater compressed air energy storage system according to claim 4, characterized in that: The constant pressure channel (7) comprises a plurality of water inlet and outlet holes arranged at the lower part of the rigid outer cover tube body, the water inlet and outlet holes being arranged along the circumference of the rigid outer cover tube, and when the flexible air storage bag (4) takes in air, the water in the energy storage cavity is output through the water inlet and outlet holes, and when the flexible air storage bag takes out air, the water in the energy storage cavity is input through the water inlet and outlet holes.

6. The underwater compressed air energy storage system according to claim 5, characterized in that: The rigid outer cover tube wall is also provided with a connecting hole, and the energy storage and release pipeline passes through the corresponding connecting hole and extends to the outside of the rigid outer cover tube. The energy storage and release pipeline is a rigid pipeline, and the free end of the energy storage and release pipeline is connected to the ocean delivery pipe (602) through a matching connecting flange (601), and the top of the ocean delivery pipe is connected in parallel with the air inlet pipeline (604) and the air outlet pipeline (603).

7. The underwater compressed air energy storage system according to claim 6, characterized in that: The top of the flexible air storage bag is provided with a safety valve opening and an air inlet and outlet, and a safety valve (402) is provided at the safety valve opening; A first flange (401) is provided at the air inlet and outlet, the energy storage and release pipeline extends upward along the inner wall of the rigid outer cover tube to the bottom of the middle partition (2), and a second flange matched with the first flange is provided on the energy storage and release pipeline (6).

8. The underwater compressed air energy storage system according to claim 7, characterized in that: The flexible air storage bag (4) is made of a flexible composite material coated on both sides with high-strength fiber-reinforced polyurethane, and the flexible air storage bag is spherical, cylindrical or ellipsoidal.

9. The underwater compressed air energy storage system according to claim 8, characterized in that: The energy storage system (642) includes a high-efficiency compressor, which compresses air to a predetermined pressure, opens an air intake valve (641), and inputs the compressed air into the flexible air storage bag along an air intake pipeline (604); the power generation system (632) includes an air turbine generator, and the compressed air is transported to the air turbine generator along an air outlet pipeline, and electricity is generated through the air turbine generator.

10. A method for storing marine hoses using buoyancy bladders, using the underwater compressed air energy storage system according to claim 9, characterized in that: Calculating the mass of the flexible air storage bag (4) filled with compressed air, the mass of the pressure carrier is not less than the mass of the flexible air storage bag filled with compressed air; Select a suitable water area, preset the diving depth of the energy storage device, calculate the hydrostatic pressure at the set depth, ensure that the water depth is sufficient to provide the required hydrostatic pressure, the energy storage system compresses the air to a predetermined pressure, and the compressed air at a constant pressure is input into the flexible air storage bag (4) through the energy storage pipeline. The hydrostatic pressure of the water body at the depth where the flexible air storage bag is located and the pressure of the compressed air in the flexible air storage bag reach a balanced state, and the compressed air is stored at a constant pressure; When energy is needed, the compressed air in the flexible air storage bag is transported to the power generation system through the energy release pipeline, converting the mechanical energy into electrical energy for use.

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