Large underwater compressed gas energy storage device

Abstract

The application provides a large underwater compressed gas energy storage device, which comprises an open rigid gas storage tank and a composite suction caisson foundation; the open rigid gas storage tank is provided with a platform and internally provided with a flexible diaphragm; the flexible diaphragm divides the inside of the open rigid gas storage tank into a compressed air storage area and a seawater storage area; the platform is provided with a central gas pipeline which is connected with the inside of the flexible diaphragm and extends into the inside of the flexible diaphragm and the lower part of the open rigid gas storage tank; the composite suction caisson foundation comprises an inner cylinder and an outer cylinder; the open rigid gas storage tank is fixedly installed above the outer cylinder; the inner cylinder is internally provided with a bulkhead plate for dividing the inside of the inner cylinder into three compartments. The application solves the problem that the underwater gas storage tank is difficult to be reliably anchored under the influence of alternating buoyancy load and environmental load such as current scouring due to cyclic charging and discharging in a complex marine environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underwater energy storage, in particular, relates to a large-scale underwater compressed gas energy storage device. BACKGROUND

[0002] Offshore renewable energy is an indispensable part of future energy structure, but its intermittency, randomness and low energy density are prominent, so it is particularly important to develop marine energy storage technology. 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 and many other advantages. However, due to the particularity of the marine environment, the underwater gas storage tank needs to be continuously filled and discharged, which results in huge circulating buoyancy load, in addition, the underwater gas storage tank also suffers from environmental loads such as sea current scouring and earthquake. The effective anchoring of the underwater gas storage tank on the seabed is facing great challenges due to the complex and harsh marine environment. SUMMARY

[0003] According to the above-mentioned technical problems that the underwater gas storage tank is subjected to alternating buoyancy load and environmental load such as sea current scouring in the complex marine environment, a large-scale underwater compressed gas energy storage device is proposed. The underwater compressed gas energy storage device can be safely and reliably fixed on the seabed.

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

[0005] A large-scale underwater compressed gas energy storage device, comprising an open rigid gas storage tank and a composite suction caisson foundation;

[0006] The open rigid gas storage tank is provided with a platform at the top and a flexible diaphragm inside;

[0007] The flexible diaphragm edge is fixedly installed on the platform, and the open rigid gas storage tank is divided into a compressed air storage area inside the flexible diaphragm and a seawater storage area outside the flexible diaphragm; a central gas pipeline connected with the inside of the flexible diaphragm is arranged on the platform, the central gas pipeline extends into the inside of the flexible diaphragm and extends to the lower part of the open rigid gas storage tank; four gas storage tank water outlets connected with the seawater storage area are arranged at equal intervals at the lower part of the open rigid gas storage tank;

[0008] The composite suction caisson foundation comprises an inner cylinder and an outer cylinder; the open rigid gas storage tank is fixedly installed above the outer cylinder; the inner cylinder is a bottom-opened cylindrical structure, an inner partition plate is arranged in the inner cylinder in an axial direction, and the inner cylinder is divided into three chambers by the inner partition plate; the outer cylinder is a top-closed and bottom-opened cylindrical structure, the upper part of the inner cylinder is located in the inner part of the outer cylinder, and the top of the inner cylinder is fixedly installed on the top sealing surface of the outer cylinder; the top sealing surface of the outer cylinder is provided with an outer cylinder pressure measuring port and an outer cylinder water pumping port which are in communication with the inner part of the outer cylinder, and one inner cylinder pressure measuring port and one inner cylinder water pumping port which are in communication with the corresponding chambers are arranged at positions corresponding to the three chambers in the inner part of the inner cylinder.

[0009] Further, the platform is further provided with four peripheral gas conveying pipelines which are in communication with the inner part of the flexible diaphragm; the lower part of the side wall of the platform is provided with a groove, and the edge of the flexible diaphragm is fixedly installed on the groove by means of an elastic clamp.

[0010] Further, the inner cylinder pressure measuring port is used for monitoring the pressure in the corresponding chamber in real time by inserting a pressure gauge into the corresponding chamber when the composite suction caisson foundation is installed; and the inner cylinder water pumping port is used for pumping seawater in the corresponding chamber by an external water pumping device to form a negative pressure in the corresponding chamber, so as to control the sinking installation of the composite suction caisson foundation to a specified depth.

[0011] Further, two outer cylinder pressure measuring ports and two outer cylinder water pumping ports are arranged on the top sealing surface of the outer cylinder.

[0012] Further, the outer cylinder pressure measuring port is used for monitoring the pressure in the inner part of the outer cylinder in real time by inserting a pressure gauge into the inner part of the outer cylinder during the installation of the composite suction caisson foundation; and the outer cylinder water pumping port is used for pumping seawater in the outer cylinder by an external water pumping device to form a negative pressure in the outer cylinder, so as to control the sinking installation of the composite suction caisson foundation to a specified depth.

[0013] Further, the cylinder diameter of the outer cylinder is greater than the cylinder diameter of the inner cylinder, and the length of the outer cylinder is less than the length of the inner cylinder.

[0014] Further, the open rigid gas storage tank, the inner cylinder and the outer cylinder are coaxially arranged.

[0015] Further, the inner partition plate is in a herringbone structure.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. The large underwater compressed gas energy storage device provided by the present application optimizes the geometry of the traditional suction caisson foundation, proposes a composite suction caisson foundation, which can provide more stable uplift bearing capacity and has the function of seawater scour protection; the three parts of the self-gravity of the gas storage tank, the self-gravity of the suction caisson foundation and the uplift bearing capacity of the suction caisson foundation are used together as anchoring force, which is more reliable than the traditional underwater gas storage tank relying only on the self-gravity of the gas storage tank for ballast.

[0018] 2. The large underwater compressed gas energy storage device provided by the present application, the flexible diaphragm inside the open rigid gas storage tank separates seawater from compressed gas, avoiding the loss caused by gas dissolving in water; the intermediate gas pipeline is not only used for conveying gas, but also used for supporting the flexible diaphragm, so that it avoids wrinkles during operation and affects energy storage and release; the energy storage device also has the function of liquid accumulation cleaning, when the gas reaches the pressure dew point and precipitates water which accumulates in the flexible diaphragm, due to the supporting effect of the intermediate gas pipeline, the accumulated liquid is gathered at the bottom of the flexible diaphragm, and the accumulated liquid in the flexible diaphragm can be removed in time by using the external micro water pump through the central gas pipeline.

[0019] 3. The large underwater compressed gas energy storage device provided by the present application utilizes the huge heat sink effect and hydrostatic pressure characteristics of seawater, which can realize nearly isothermal and isobaric compression and expansion of compressed gas, which is beneficial to improve the energy storage / release efficiency of the system.

[0020] Based on the above reasons, the present application can be widely used in the field of underwater energy storage. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present 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 present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 The large underwater compressed gas energy storage device structure diagram of the present application.

[0023] Figure 2 The composite suction caisson foundation structure diagram of the present application.

[0024] Figure 3 The large underwater compressed gas energy storage device longitudinal section view of the present application.

[0025] Figure 4 The open rigid gas storage tank structure diagram of the present application.

[0026] Figure 5This is a longitudinal cross-sectional view of the open rigid gas storage tank described in this invention.

[0027] Figure 6 This is a top view of the large underwater compressed gas energy storage device described in this invention.

[0028] Figure 7 This is a schematic diagram of the platform structure described in this invention.

[0029] Figure 8 This is a schematic diagram of the energy storage process of the large underwater compressed gas energy storage device described in this invention.

[0030] Figure 9 This is a schematic diagram of the energy release process of the large underwater compressed gas energy storage device described in this invention.

[0031] In the diagram: 1. Open rigid gas storage tank; 2. Composite suction caisson foundation; 3. Inner cylinder; 4. Outer cylinder; 5. Compartment plate; 6. External gas supply pipeline; 7. Central gas supply pipeline; 8. Gas storage tank water inlet; 9. Flexible diaphragm; 10. Elastic clamp; 11. Platform; 12. Inner cylinder pressure test port; 13. Inner cylinder water inlet; 14. Outer cylinder pressure test port; 15. Outer cylinder water inlet; 16. Groove. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0036] In the description of the present application, it is to be understood that the orientation terms such as "front", "back", "up", "down", "left", "right", "transverse", "vertical", "horizontal", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, which are merely for the convenience of describing the present application and simplifying the description, and do not indicate or 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 limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

[0037] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with respect to 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 device 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.

[0038] In addition, it should be noted that the use of the terms "first", "second", etc. to describe various components is merely intended to distinguish the corresponding components, and the above terms do not have special meanings unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0039] Example 1

[0040] As Figures 1-7 shown, the present application provides a large underwater compressed gas energy storage device, comprising an open rigid gas storage tank 1 and a composite suction caisson foundation 2;

[0041] The open rigid 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;

[0042] The open rigid gas storage tank 1 is provided with a platform 11 at the top, and a flexible diaphragm 9 is arranged inside;

[0043] The flexible diaphragm 9 is fixedly installed at the edge of the platform 11, and the inside of the open rigid gas storage tank 1 is divided into a compressed air storage area inside the flexible diaphragm 9 and a seawater storage area outside the flexible diaphragm 9; the flexible diaphragm 9 is used for storing compressed gas and separating compressed gas and seawater; the flexible diaphragm 9 can fill the internal space of the open rigid gas storage tank 1 after inflation;

[0044] The platform 11 is provided with a central gas conveying pipeline 7 connected to the inside of the flexible diaphragm 9, and the central gas conveying pipeline 7 extends into the inside of the flexible diaphragm 9 and into the lower part of the open rigid gas storage tank 1;

[0045] The central gas conveying pipeline 7 has three functions, including: for conveying compressed gas into or out of the inside of the flexible diaphragm 9; for helping the flexible diaphragm 9 to better expand during compressed gas conveying, preventing the internal gas storage volume from being reduced or even damaging the flexible diaphragm 9 due to wrinkles of the flexible diaphragm 9; when compressed gas reaches the pressure dew point and precipitates water, which accumulates at the bottom of the flexible diaphragm 9, a micro water pump can be connected to the central gas conveying pipeline 7 to remove the accumulated water at the bottom of the flexible diaphragm 9 in time;

[0046] The lower part of the central gas conveying pipeline 7 is provided with a gas vent hole in the radial direction, which can facilitate the outward conveying of compressed gas when the flexible diaphragm 9 floats and blocks the opening at the bottom of the central gas conveying pipeline 7;

[0047] The lower part of the open rigid gas storage tank 1 is provided with four gas storage tank water inlets 8 connected to the seawater storage area at equal intervals, for allowing seawater to freely enter and exit the open rigid gas storage tank 1,

[0048] The water inlet 8 of the open rigid gas tank 1 can make the internal gas pressure of the flexible diaphragm 9 equal to the hydrostatic pressure generated by the current depth of the water inlet 8 during the gas storage and exhaust process (the pressure is calculated at the depth of the center of the water inlet 8), and the hydrostatic pressure generated by the current depth does not change, so that the isobaric compression and expansion can be realized in the flexible diaphragm 9, which is beneficial to the system element working in the best efficiency interval and improving the system energy storage efficiency compared with the isochoric compression and expansion of the traditional closed gas tank; at the same time, since the compressed gas stored in the flexible diaphragm 9 and the seawater can fully exchange heat through the wall of the flexible diaphragm, the compression and expansion of the gas in the flexible diaphragm 9 is close to the isothermal process, which is also beneficial to improve the system efficiency.

[0049] The composite suction caisson foundation 2 comprises an inner cylinder 4 and an outer cylinder 3; the open rigid gas tank 1 is fixedly installed above the outer cylinder 3; after the composite suction caisson foundation 2 is installed, the inner cylinder 4 and the outer cylinder 3 can provide anchoring force for the open rigid gas tank 1 above when it is subjected to external load disturbance.

[0050] The inner cylinder 4 is a cylinder structure with an open bottom, and a partition plate 5 is arranged in the inner cylinder 4 in the axial direction, which is used to divide the inner cylinder 4 into three compartments, and the partition plate 5 is used as a reinforcing rib to improve the structural strength of the inner cylinder 4, 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 4.

[0051] The outer cylinder 3 is a cylinder structure with a closed top and an open bottom, the upper part of the inner cylinder 4 is located in the inner part of the outer cylinder 3 and is fixedly installed on the top sealing surface of the outer cylinder 3; the top sealing surface of the outer cylinder 3 is provided with an outer cylinder pressure measuring port 14 and an outer cylinder water outlet 15 which are in communication with the inner part of the outer cylinder 3, and at positions corresponding to the three compartments in the inner cylinder 4, an inner cylinder pressure measuring port 12 and an inner cylinder water outlet 13 which are in communication with the corresponding compartments are respectively arranged.

[0052] Further, the platform 11 is also provided with four peripheral gas conveying pipes 6 which are in communication with the inside of the flexible diaphragm 9, which are used to assist the central gas conveying pipe 7 to convey compressed gas into or out of the flexible diaphragm 9; the lower part of the side wall of the platform 11 is provided with a groove 16, and the edge of the flexible diaphragm 9 is fixedly installed in the groove 16 through an elastic clamp 10.

[0053] Further, the wall thickness of the open rigid gas tank 1 is 150-200 mm; according to the production regulations of QB / HQ6539-2007 "Simple Steel Pressure Vessel", the thickness of the gas tank cylinder is not less than 4.5-5 mm, and the wall thickness of the open rigid gas tank 1 provided by the application is increased by about 30-40 times compared with the traditional pressure vessel, which can improve the self gravity to provide sufficient strength and additional gravity ballast, and to a certain extent, the geometric size of the composite suction caisson foundation can be reduced. The additional sinking force is provided by the self gravity during the installation sinking process of the composite suction caisson foundation 2 to overcome the resistance of the soil to the tip of the inner cylinder 4 and the outer cylinder 3 during the sinking process.

[0054] Further, the open rigid gas 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 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.

[0055] Further, when the composite suction caisson foundation 2 falls onto the seabed in the sea: the inner cylinder pressure measuring port 12 is used to monitor the pressure inside the corresponding chamber in real time by inserting a pressure gauge into the corresponding chamber during installation of the composite suction caisson foundation 2; the inner cylinder water pumping port 13 is used to pump 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;

[0056] The three chambers in the inner cylinder 3 are each provided with the corresponding inner cylinder pressure measuring port 12 and the inner cylinder water pumping port 13, which are used to control the levelness during installation of the composite suction caisson foundation 2 by individually controlling the pressure difference in each chamber, to prevent the composite suction caisson foundation 2 from tilting.

[0057] Further, two outer cylinder pressure measuring ports 14 and two outer cylinder water pumping ports 15 are provided on the top sealing surface of the outer cylinder 3.

[0058] Further, when the composite suction caisson foundation 2 falls onto the seabed in the sea: the outer cylinder pressure measuring port 14 is used to monitor the internal pressure of the outer cylinder 3 in real time by inserting a pressure gauge into the inner cylinder 3 during installation of the composite suction caisson foundation 2; the outer cylinder water pumping port 15 is used to pump the seawater in the outer cylinder 3 by connecting an external water pumping device to form negative pressure in the outer cylinder 3, thereby controlling the sinking installation of the composite suction caisson foundation 2 to a specified depth.

[0059] Furthermore, the outer cylinder 3 has a larger diameter than the inner cylinder 4, and the length of the outer cylinder 3 is shorter than the length of the inner cylinder 4, thereby providing sufficient horizontal bearing capacity and anti-overturning capability when the open rigid gas storage tank 1 above is subjected to strong horizontal loads, as well as seawater scouring protection for the large underwater compressed gas energy storage device of the present invention.

[0060] Furthermore, the open rigid gas storage tank 1, the inner cylinder 4, and the outer cylinder 3 are coaxially arranged.

[0061] Furthermore, the compartment panel 5 has a herringbone structure.

[0062] Furthermore, the anchoring force of the underwater compressed gas energy storage device consists of three parts: the self-weight of the open rigid gas storage tank 1, the self-weight of the composite suction caisson foundation 2, and the bearing capacity of the composite suction caisson foundation 2.

[0063] During operation, the entire device is first placed in the sea, and seawater is poured into the inner cylinder 4 and the outer cylinder 3. After the composite suction caisson foundation 2 is lowered to the seabed, the seawater inside the inner cylinder 4 and the outer cylinder 3 is pumped out, causing the composite suction caisson foundation 2 to sink until both the inner cylinder 4 and the outer cylinder 3 are installed on the seabed. The inner cylinder 4 and the outer cylinder 3 are used to provide anchoring force for the open rigid gas storage tank 1 when it is subjected to external load disturbance after the composite suction caisson foundation 2 is installed in place.

[0064] The large underwater compressed gas energy storage device of the present invention has two processes: energy storage and energy release.

[0065] Energy storage process:

[0066] like Figure 8 As shown, during the sinking of the entire device in the sea, the space between the interior of the open rigid gas storage tank 1 and the exterior of the flexible diaphragm 9 is filled with seawater entering through the gas storage tank inlet 8. Then, compressed gas with a certain pressure is introduced into the flexible diaphragm 9 through the central gas supply pipe 7 and the peripheral gas supply pipe 6. The flexible diaphragm 9 begins to expand and stretch. As the gas storage process proceeds, the volume of the flexible diaphragm 9 continuously increases, gradually stretching downwards towards the open rigid gas storage tank 1. During this process, the seawater in the open rigid gas storage tank 1 is gradually discharged outwards through the gas storage tank inlet 8. In the initial process, the pressure of the compressed gas in the flexible diaphragm 9 remains constant until the flexible diaphragm 9 is fully expanded, filling the interior space of the open rigid gas storage tank 1.

[0067] Energy release process:

[0068] like Figure 9As shown, when the outside needs, the compressed gas stored in the flexible diaphragm 9 inside flows out through the center gas pipeline 7 and the peripheral gas pipeline 6, with the decrease of the compressed gas volume, the outside seawater continuously flows into the open rigid gas holder 1 inside through the gas holder water inlet 8, the gas pressure inside the flexible diaphragm 9 remains constant during the exhaust process, until the compressed gas inside the flexible diaphragm 9 is completely exhausted, the seawater fills the space between the open rigid gas holder 1 inside and the outside of the flexible diaphragm 9 again, the above is a complete working cycle.

[0069] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A large-scale underwater compressed gas energy storage device, characterized in that, This includes open-type rigid gas storage tanks and composite suction caisson foundations; The open-type rigid gas storage tank is equipped with a platform on top and a flexible diaphragm inside. The flexible diaphragm is fixedly installed on the platform, dividing the interior of the open rigid gas storage tank into a compressed air storage area inside the flexible diaphragm and a seawater storage area outside the flexible diaphragm. A central gas delivery pipe is provided on the platform, which is connected to the interior of the flexible diaphragm and extends into the interior of the open rigid gas storage tank. Four gas tank inlets connected to the seawater storage area are evenly spaced at the bottom of the open rigid gas storage tank. The composite suction caisson foundation includes an inner cylinder and an outer cylinder; the open rigid gas storage tank is fixedly installed above the outer cylinder; the inner cylinder is a cylindrical structure with an open bottom, and a compartment plate is provided axially inside the inner cylinder to divide the interior of the inner cylinder into three compartments; the outer cylinder is a cylindrical structure with a closed top and an open bottom, the upper part of the inner cylinder is located inside the outer cylinder and the top is fixedly installed on the top sealing surface of the outer cylinder; the top sealing surface of the outer cylinder has an outer cylinder pressure test port and an outer cylinder water suction port that communicate with the interior of the outer cylinder, and at the positions corresponding to the three compartments inside the inner cylinder, an inner cylinder pressure test port and an inner cylinder water suction port that communicate with the corresponding compartment are respectively provided; The platform is also provided with four peripheral gas transmission pipes that communicate with the interior of the flexible diaphragm; the lower side wall of the platform is provided with a groove, and the edge of the flexible diaphragm is fixedly installed in the groove by elastic clamps; The lower part of the central gas delivery pipe has radially vent holes. When compressed gas is delivered outward through the central gas delivery pipe, the flexible diaphragm may float up and block the bottom opening of the central gas delivery pipe. The radially vent holes facilitate the outward delivery of compressed gas. Furthermore, when the compressed gas reaches its pressure dew point and precipitates moisture, accumulating at the bottom of the flexible diaphragm, the accumulated liquid can be promptly removed from the flexible diaphragm by connecting a micro water pump externally to the central gas delivery pipe. The outer cylinder has a larger diameter than the inner cylinder, and the outer cylinder has a shorter length than the inner cylinder; the open rigid gas storage tank, the inner cylinder, and the outer cylinder are coaxially arranged. The inner cylinder pressure measuring port is used to monitor the pressure inside the corresponding compartment in real time by inserting a pressure gauge into the corresponding compartment during the installation of the composite suction caisson foundation; the inner cylinder water extraction port is used to extract seawater from the corresponding compartment by connecting an external water pumping device during the installation of the composite suction caisson foundation, so as to create a negative pressure in the corresponding compartment, thereby controlling the sinking and installation of the composite suction caisson foundation to a specified depth. The outer cylinder pressure measuring port is used to monitor the internal pressure of the outer cylinder in real time by inserting a pressure gauge into the outer cylinder during the installation of the composite suction caisson foundation; the outer cylinder water extraction port is used to extract seawater from the outer cylinder by connecting an external water pumping device during the installation of the composite suction caisson foundation, so as to create a negative pressure inside the outer cylinder, thereby controlling the sinking and installation of the composite suction caisson foundation to a specified depth.

2. The large-scale underwater compressed gas energy storage device according to claim 1, characterized in that, Two pressure testing ports and two water extraction ports are provided on the top sealing surface of the outer cylinder.

3. The large-scale underwater compressed gas energy storage device according to claim 1, characterized in that, The compartment panel has a herringbone structure.

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