Large-scale underwater constant-pressure hydrogen storage device

Abstract

The invention is applicable to the technical field of seabed hydrogen storage, and provides a large-scale underwater constant-pressure hydrogen storage device which comprises a hydrogen storage tank, a hydrogen supply network and a hydrogen transportation pipeline, and the hydrogen storage tank is connected with the hydrogen supply network through the hydrogen transportation pipeline; the hydrogen storage tank comprises a rigid gas storage tank and a composite suction caisson arranged at the bottom of the rigid gas storage tank, a central pipeline connected with a hydrogen conveying pipeline is arranged in the rigid gas storage tank, and a seawater port used for seawater inflow or discharge is further formed in the bottom of the rigid gas storage tank. A seawater filter used for filtering seawater is further arranged in the seawater port, and a storage tank flexible film used for preventing compressed hydrogen from making contact with the seawater is further arranged in the rigid gas storage tank. And the underwater hydrogen storage technology is promoted to develop in a more efficient, safer and more economical direction, and contributions are made to sustainable development of the hydrogen energy industry.

Description

Technical Field

[0001] The invention relates to the technical field of submarine hydrogen storage, in particular to a large-scale underwater constant-pressure hydrogen storage device. Background Art

[0002] With the in-depth development and utilization of marine resources, especially the breakthrough in direct hydrogen production from seawater, large-scale marine hydrogen storage technology has emerged and has shown great application potential and market demand. As an efficient and clean energy carrier, hydrogen has the characteristics of low density, high diffusivity and low ignition point. While bringing about an energy revolution, it also brings unprecedented challenges to its safe and efficient storage and transportation. Especially in the marine environment, how to overcome natural environmental factors and achieve long-term, stable and safe storage of hydrogen has become a key issue that needs to be urgently solved in the current development of hydrogen energy technology.

[0003] At present, the mainstream marine hydrogen storage technology mainly focuses on floating storage solutions. This technology uses the principle of buoyancy to store and manage hydrogen by arranging large hydrogen storage tanks on the sea surface. However, this method faces multiple challenges and limitations in practice. First, floating hydrogen storage tanks are directly exposed to the harsh marine environment and are subjected to the impact and erosion of strong winds, huge waves and seasonal floating ice for a long time, which not only accelerates the aging and corrosion of the tank materials, but also increases maintenance costs and safety hazards. Secondly, floating storage relies on high-pressure gas tanks to increase the energy storage density of hydrogen, but due to the current level of material science and structural design, the stress strength of high-pressure tanks has become an important factor restricting the efficiency and safety of hydrogen storage. This means that in order to maintain sufficient energy storage density, higher standards and more expensive tank materials and technologies must be adopted, which further increases costs. In addition, the floating hydrogen storage solution also has the problem of occupying a large amount of offshore space resources. With the rapid development of the hydrogen energy industry, the demand for large-scale hydrogen storage facilities has increased dramatically, and the effective use of ocean space as a public resource is directly related to the sustainable development of multiple industries such as fishery production and maritime transportation. The widespread deployment of floating hydrogen storage tanks will undoubtedly cause certain interference to the marine ecological environment, restrict the freedom of fishing activities, and may even affect the smooth flow and safety of sea lanes, triggering a series of social and economic problems.

[0004] Compared with offshore platform storage, although underwater storage can save precious sea surface and offshore space resources, the complex and changeable geographical environment of the seabed (such as undulating seabed topography and uneven distribution of seabed sediments) poses severe challenges to the design and deployment of hydrogen storage facilities. Once deployed, underwater hydrogen storage facilities have much higher maintenance costs and technical difficulties than surface facilities. The deep-sea environment places extremely high demands on the corrosion resistance, sealing and remote monitoring capabilities of the equipment. In deep-water environments, as the water depth increases, the hydrostatic pressure rises sharply, which poses a huge test to the structural strength and material properties of conventional large-scale gas storage tanks.

[0005] Therefore, in view of the above situation, there is an urgent need to provide a large-scale underwater constant-pressure hydrogen storage device to overcome the shortcomings in current practical applications. Summary of the invention

[0006] The purpose of the present invention is to provide a large-scale underwater constant-pressure hydrogen storage device, aiming to solve the problems in the above-mentioned background technology.

[0007] The present invention is implemented as follows: a large-scale underwater constant pressure hydrogen storage device, comprising:

[0008] A hydrogen storage tank, a hydrogen supply network and a hydrogen transportation pipeline, wherein the hydrogen storage tank and the hydrogen supply network are connected via a hydrogen transportation pipeline;

[0009] The hydrogen storage tank includes a rigid gas storage tank and a composite suction caisson arranged at the bottom of the rigid gas storage tank. A central pipeline connected to a hydrogen transport pipeline is arranged in the rigid gas storage tank. A seawater port for seawater inflow or discharge is also arranged at the bottom of the rigid gas storage tank, and a seawater filter for filtering seawater is also arranged in the seawater port. A flexible tank membrane for preventing compressed hydrogen from contacting seawater is also arranged in the rigid gas storage tank.

[0010] As a further solution of the present invention: the hydrogen supply network is provided with hydrogen inlet and outlet valves, and the hydrogen inlet and outlet valves on the hydrogen supply network are connected to a low-pressure hydrogen delivery pipeline, the hydrogen delivery pipeline is provided with hydrogen inlet and outlet valves, and the central pipeline is connected to the hydrogen inlet and outlet valves on the hydrogen delivery pipeline.

[0011] As a further solution of the present invention: the rigid gas storage tank is composed of a hemispherical tank top and a cylindrical tank body, and the rigid gas storage tank is connected to the center position of the composite air-intake caisson.

[0012] As a further solution of the present invention: a protective layer is provided on the outer side of the side wall of the rigid gas storage tank, and the protective layer is made of polyurethane and rubber materials;

[0013] An outer wall for corrosion resistance is also arranged on the outer side of the protective layer, and the outer wall is made of improved concrete.

[0014] As a further solution of the present invention: a seawater monitoring device is provided inside the side wall of the rigid gas storage tank, and the seawater monitoring device is arranged in a long shape on both sides of the rigid gas storage tank, and a water level sensor is distributed on the seawater monitoring device according to a scale, and the upper and lower ends of the water level sensor correspond to the highest position and the lowest position of the rigid gas storage tank respectively.

[0015] As a further solution of the present invention: a temperature and pressure monitoring device is attached to the rigid gas storage tank.

[0016] As a further solution of the present invention: the flexible membrane of the storage tank is composed of an inner matrix material layer, a middle layer of heat insulating material and an outer layer of reinforcing material.

[0017] As a further solution of the present invention: the hydrogen transport pipeline and the central pipeline both adopt a two-layer structure, the inner layer is a high-grade steel anti-hydrogen pipe and a hydrogen barrier coating, and the outer layer is glass fiber reinforced plastic and a seawater resistant coating.

[0018] Signal channels are provided between the two-layer structures of the hydrogen transport pipeline and the central pipeline.

[0019] As a further solution of the present invention: the seawater ports are symmetrically arranged on the rigid air storage tank and the composite air suction caisson respectively.

[0020] The seawater filter is a self-cleaning filter.

[0021] As a further solution of the present invention: the upper layer of the composite suction caisson is the caisson foundation and is equipped with concrete weights and steel ring ribs, and the lower layer of the composite suction caisson is composed of a concrete outer wall and a steel skeleton.

[0022] The composite suction caisson is also provided with lifting lugs.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This application uses a composite suction caisson as the base, and connects the cableway for integrated submarine installation and recovery, which improves the efficiency of the implementation and maintenance of the hydrogen storage device. At the same time, it has little demand for geographical location and overcomes geographical restrictions;

[0025] 2. The present application has a simple structure, and the input and discharge of hydrogen can be completed through a set of pipes, which saves costs and facilitates daily maintenance. The rigid gas storage tank adopts an improved concrete outer wall, which not only meets the pressure resistance requirements, but also provides lower cost requirements, which is conducive to improving the commercial feasibility of underwater hydrogen storage;

[0026] 3. The rigid gas storage tank and composite air-intake caisson described in the present application autonomously adjust the pressure through the seawater port to keep the hydrogen pressure inside the device the same as the hydrostatic pressure of the corresponding water depth, thereby reducing the strength requirements and fatigue loss of the rigid gas storage tank and the composite air-intake caisson and improving the stability of long-term hydrogen storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of the composite suction caisson in the present invention.

[0029] Figure 3It is a schematic diagram of the partial cross-sectional structure of the rigid gas storage tank in the present invention.

[0030] Figure 4 It is a schematic diagram of the structure of the seawater filter in the present invention.

[0031] Figure 5 It is a schematic diagram of the working state of the present invention.

[0032] Figure 6 It is the work flow chart of the present invention.

[0033] In the attached figure: hydrogen supply network 1, hydrogen transport pipeline 2, rigid gas storage tank 3, tank flexible membrane 4, central pipeline 5, seawater port 6, seawater filter 7, composite suction caisson 8, hydrogen storage tank 11, sea level 12, sinking position 13, concrete weight 21, steel ring rib 22, side wall 31, protective layer 32, outer wall 33, seawater monitoring device 34, gas tank lowest position 35, gas-liquid interface 36, temperature and pressure monitoring device 37, gas tank highest position 38, water inlet 41, coarse filter 42, hydraulic motor 43, differential pressure sensor 44, drain valve 45, drain pipe 46, fine filter 47, suction nozzle 48, water outlet 49. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The specific implementation of the present invention is described in detail below in combination with specific embodiments.

[0035] See also Figure 1-Figure 6 , an embodiment of the present invention provides a large-scale underwater constant-pressure hydrogen storage device, the large-scale underwater constant-pressure hydrogen storage device comprising:

[0036] A hydrogen storage tank 11, a hydrogen supply network 1 and a hydrogen transportation pipeline 2, wherein the hydrogen storage tank 11 and the hydrogen supply network 1 are connected via the hydrogen transportation pipeline 2;

[0037] The hydrogen storage tank 11 includes a rigid gas storage tank 3 and a composite suction caisson 8 arranged at the bottom of the rigid gas storage tank 3, a central pipeline 5 connected to the hydrogen transport pipeline 2 is arranged in the rigid gas storage tank 3, a seawater port 6 for seawater inflow or discharge is also arranged at the bottom of the rigid gas storage tank 3, and a seawater filter 7 for filtering seawater is also arranged in the seawater port 6, and a tank flexible membrane 4 for preventing compressed hydrogen from contacting seawater is also arranged in the rigid gas storage tank 3;

[0038] The hydrogen supply network 1 is provided with hydrogen inlet and outlet valves, and the hydrogen inlet and outlet valves on the hydrogen supply network 1 are connected to a low-pressure hydrogen delivery pipeline, the hydrogen delivery pipeline 2 is provided with hydrogen inlet and outlet valves, and the central pipeline 5 is connected to the hydrogen inlet and outlet valves on the hydrogen delivery pipeline 2;

[0039] The rigid gas storage tank 3 is composed of a hemispherical tank top and a cylindrical tank body, and the rigid gas storage tank 3 is connected to the center position of the composite air-intake caisson.

[0040] In the embodiment of the present invention, the hydrogen supply network 1 connects the hydrogen prepared at sea to the hydrogen transport pipeline 2, the hydrogen transport pipeline 2 transports the hydrogen to the hydrogen storage tank 11, the rigid gas storage tank 3 is used to store the main body of compressed hydrogen, the central pipeline 5 is used to maintain the shape of the storage tank flexible membrane 4, transport hydrogen and promote the replacement of damaged storage tank flexible membrane 4; the seawater filter 7 is used to connect the seawater port and the external seawater to keep the seawater in the hydrogen storage device pure, and the composite suction caisson 8 is used to stabilize the entire device on the seabed;

[0041] In the non-hydrogen storage state, the hydrogen storage tank 11 is located at the sea level 12. At this time, the buoyancy of the rigid gas storage tank 3 is equal to the gravity of the rigid gas storage tank 3, and the internal air pressure of the rigid gas storage tank 3 is equal to the external atmospheric pressure. During the hydrogen storage process, the hydrogen inlet valve is opened, and the hydrogen prepared at sea is concentrated in the hydrogen supply network 1 and input into the hydrogen transport pipeline 2. The hydrogen transport pipeline 2 is connected to the central pipeline 5. At this stage, the internal pressure and mass of the hydrogen storage tank 11 increase, and the hydrogen storage tank 11 gradually sinks; the compressed hydrogen and the internal seawater are separated by the storage tank flexible membrane 4, and the seawater is gradually discharged from the rigid gas storage tank 3 through the seawater port 6 until the seawater is completely discharged and the hydrogen storage capacity reaches the maximum value; after the filling is completed, the hydrogen storage tank 11 is suspended at the sinking position 13 according to the sea level h. At this time, the internal pressure of the rigid gas storage tank 3 is equal to the hydrostatic pressure outside the rigid gas storage tank 3, maintaining the internal and external pressure balance state; during the hydrogen release process, the hydrogen outlet valve is opened, and the stored compressed hydrogen is released in sequence through the central pipeline 5, the hydrogen input pipeline 2 and the hydrogen supply network 1. At this stage, the internal pressure and mass of the hydrogen storage tank 11 decrease, the gas pressure inside the rigid gas storage tank 3 is less than the seawater pressure, the hydrogen storage tank 11 gradually floats up, and the external seawater continuously flows into the rigid gas storage tank 3 through the seawater port. According to the requirements of hydrogen storage and release, the hydrogen storage tank 11 can be suspended at any position from sea level to h.

[0042] In one embodiment of the present invention, see Figure 1-Figure 6 A protective layer 32 is provided on the outer side of the side wall 31 of the rigid gas storage tank 3 to maintain the temperature of the hydrogen in the gas storage tank. The protective layer 32 is made of polyurethane and rubber materials and has excellent thermal insulation, waterproof and anti-corrosion properties;

[0043] The outer side of the protective layer 32 is also provided with an outer wall 33 for corrosion resistance, and the outer wall 33 is made of improved concrete. The improved concrete is made of fiber-reinforced polymer and sustainable alkali-activated cementitious material, and has the advantages of high compressive strength and low cost.

[0044] A seawater monitoring device 34 is provided in the side wall 31 of the rigid gas storage tank 3, which can monitor the depth of the seawater inside the rigid gas storage tank. The seawater monitoring device 34 is arranged in a long shape on both sides of the rigid gas storage tank 3, and water level sensors are distributed on the seawater monitoring device 34 according to scales. The upper and lower ends of the water level sensor correspond to the highest position 38 and the lowest position 35 of the rigid gas storage tank 3 respectively. The conductivity of the water between the gas-liquid interface 36 in the rigid gas storage tank 3 and the bottom of the rigid gas storage tank 3 is used to continuously measure the electrode water level to monitor the height of the seawater inside the rigid gas storage tank. The seawater monitoring device is made of a highly sealing material and uses glass fiber reinforced plastic as a protective outer layer, so it will not be affected by the seawater environment.

[0045] The rigid gas storage tank 3 is provided with a temperature and pressure monitoring device 37, which can convert the pressure and temperature of the hydrogen gas and the internal seawater in the rigid hydrogen storage tank into electrical signals in real time.

[0046] In one embodiment of the present invention, see Figure 1 The flexible membrane 4 of the storage tank is composed of an inner base material layer, a middle layer of heat insulating material and an outer layer of reinforcing material, which ensures effective sealing and flexibility, and strictly isolates the direct contact and heat interaction between the hydrogen stored in the rigid gas tank and the internal seawater.

[0047] In one embodiment of the present invention, see Figure 1 The hydrogen transport pipeline 2 and the central pipeline 5 both adopt a two-layer structure, the inner layer is a high-grade steel anti-hydrogen pipe and a hydrogen barrier coating, and the outer layer is a glass fiber reinforced plastic and a seawater resistant coating;

[0048] A signal channel is provided between the two-layer structures of the hydrogen transport pipeline 2 and the central pipeline 5, which is responsible for transmitting the signal in the hydrogen storage device to the upper control port and conveying the instruction of the upper control port to the hydrogen storage device.

[0049] In one embodiment of the present invention, see Figure 1-Figure 6 The seawater ports 6 are symmetrically arranged on the rigid gas storage tank 3 and the composite air suction caisson 8 to maintain the connection between the seawater inside the device and the seawater outside. The seawater ports 6 are equipped with seawater filters 7;

[0050] The seawater filter 7 is a self-cleaning filter, which can keep the seawater filter working stably for a long time on the seabed, purify the external seawater flowing into the hydrogen storage device, and maintain the stability of the internal environment of the rigid gas storage tank; the operation and control of the self-cleaning filter can automatically clean and filter and automatically discharge sewage without any external energy; during the filtering process of the self-cleaning filter, impurities on the filter screen gradually accumulate, and the hydraulic valve is opened by the pressure difference, and the dirt on the fine filter screen is sucked by the suction nozzle, and flows into the sewage valve through the hydraulic motor for discharge, forming a sewage suction process, during which the normal filtering work of the filter machine is uninterrupted. At the same time, when the internal seawater flows out, the impurities on the filter screen will also be taken out.

[0051] In this embodiment, the working mode of the seawater filter is as follows: water enters the self-cleaning filter from the water inlet 41, the coarse filter 42 filters large particles of impurities, the fine filter 47 filters small particles of impurities, and clean water is discharged from the water outlet 49; during the hydrogen release process, external seawater flows in, the self-cleaning filter continuously filters, impurities in the filter gradually accumulate, and the drain valve 45 is opened by the pressure difference, wherein the self-cleaning filter is provided with a pressure difference sensor 44, and the dirt inside the fine filter 47 and the coarse filter 42 is sucked through the suction nozzle 48, and flows into the drain pipe 46 for discharge by the hydraulic motor 43, forming a sewage suction process, during which the normal filtering work of the self-cleaning filter is uninterrupted; during the hydrogen storage process, internal seawater flows in from the water outlet port 49, the drain valve 45 is opened, the suction nozzle 48 works, and further cleaning is performed, and at the same time, the impurities on the outside of the coarse filter 42 are also taken out by the water flow;

[0052] The composite air-intake caisson 8 is integrally connected to the rigid air storage tank 3, and is provided with eight seawater ports 6 to maintain a stable pressure. The eight seawater ports 6 allow seawater to enter and exit, and maintain the pressure of the composite air-intake caisson 8 at the hydrostatic pressure of the corresponding water depth, thereby reducing the impact of external seawater on the composite air-intake caisson 8, increasing the service life of the composite air-intake caisson 8, and improving the stability of the overall device; the eight seawater ports 6 are arranged so that the composite air-intake caisson 8 has an efficient pressure regulation rate, and the composite air-intake caisson 8 is subjected to stable force when seawater enters and exits, and is not easily deformed or damaged.

[0053] In one embodiment of the present invention, see Figure 1-Figure 6 The upper layer of the composite suction caisson 8 is the caisson foundation, and is equipped with concrete weights 21 and steel ring ribs 22. The lower layer of the composite suction caisson 8 is composed of a concrete outer wall and a steel skeleton. The internal space retains seawater and is connected to the external seawater through a seawater port.

[0054] The composite suction caisson 8 is also provided with lifting lugs, which are connected to the cableway to realize the integrated placement and recovery of the entire large-scale underwater constant pressure hydrogen storage device.

[0055] In summary, the present invention effectively overcomes the geographical limitations of the seabed, realizes efficient space utilization in a complex seabed environment, and combines remote monitoring and fault diagnosis technology to significantly improve the maintainability and operational efficiency of underwater hydrogen storage facilities, thereby reducing long-term operation and maintenance costs; the present invention innovatively proposes a constant-pressure hydrogen storage mechanism in which the internal gas pressure is equivalent to the hydrostatic pressure of the corresponding water depth, which not only avoids the risk of structural damage caused by excessive internal and external pressure differences, but also optimizes the structural design so that the hydrogen storage device can maintain a long-term stable operating state under extreme deepwater conditions, thereby meeting the stringent strength requirements in deepwater environments; the present invention, through the comprehensive application of the above-mentioned technological innovations, not only significantly improves the safety and reliability of underwater hydrogen storage, but also reduces the overall cost of offshore hydrogen production and storage by optimizing the cost structure, laying a solid economic foundation for the widespread application of underwater hydrogen storage technology and improving its commercial feasibility;

[0056] This invention aims to comprehensively solve the key technical problems faced by large-scale submarine hydrogen storage through a series of technological innovations, promote the development of underwater hydrogen storage technology in a more efficient, safer and more economical direction, and contribute to the sustainable development of the hydrogen energy industry.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "slide", "rotate", "fix", "have" and the like should be understood in a broad sense, for example, it can be a welding connection, a bolt connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-scale underwater constant pressure hydrogen storage device, comprising a hydrogen storage tank, a hydrogen supply network and a hydrogen transport pipeline, wherein the hydrogen storage tank is connected to the hydrogen supply network via a hydrogen transport pipeline, characterized in that: The hydrogen storage tank includes a rigid gas storage tank and a composite suction caisson arranged at the bottom of the rigid gas storage tank. A central pipeline connected to a hydrogen transport pipeline is arranged in the rigid gas storage tank. A seawater port for seawater inflow or discharge is also arranged at the bottom of the rigid gas storage tank, and a seawater filter for filtering seawater is also arranged in the seawater port. A flexible tank membrane for preventing compressed hydrogen from contacting seawater is also arranged in the rigid gas storage tank.

2. The large-scale underwater constant pressure hydrogen storage device according to claim 1 is characterized in that: The hydrogen supply network is provided with hydrogen inlet and outlet valves, and the hydrogen inlet and outlet valves on the hydrogen supply network are connected to a low-pressure hydrogen delivery pipeline. The hydrogen delivery pipeline is provided with hydrogen inlet and outlet valves, and the central pipeline is connected to the hydrogen inlet and outlet valves on the hydrogen delivery pipeline.

3. The large-scale underwater constant pressure hydrogen storage device according to claim 1, characterized in that: The rigid gas storage tank is composed of a hemispherical tank top and a cylindrical tank body, and the rigid gas storage tank is connected to the center position of the composite air-intake caisson.

4. The large-scale underwater constant pressure hydrogen storage device according to claim 1 is characterized in that: A protective layer is provided on the outer side of the side wall of the rigid gas storage tank, and the protective layer is made of polyurethane and rubber materials; An outer wall for corrosion resistance is also arranged on the outer side of the protective layer, and the outer wall is made of improved concrete.

5. The large-scale underwater constant pressure hydrogen storage device according to claim 4 is characterized in that: A seawater monitoring device is provided inside the side wall of the rigid gas storage tank. The seawater monitoring device is arranged in a long shape on both sides of the rigid gas storage tank, and a water level sensor is distributed on the seawater monitoring device according to a scale. The upper and lower ends of the water level sensor correspond to the highest position and the lowest position of the rigid gas storage tank respectively.

6. The large-scale underwater constant pressure hydrogen storage device according to claim 5, characterized in that: The rigid gas storage tank is provided with a temperature and pressure monitoring device.

7. The large-scale underwater constant pressure hydrogen storage device according to claim 1 is characterized in that: The storage tank flexible membrane consists of an inner base material layer, a middle layer of heat insulating material and an outer layer of reinforcing material.

8. The large-scale underwater constant pressure hydrogen storage device according to claim 1, characterized in that: The hydrogen transport pipeline and central pipeline both adopt a two-layer structure, with the inner layer being high-grade steel anti-hydrogen pipe and hydrogen barrier coating, and the outer layer being fiberglass and seawater resistant coating; Signal channels are provided between the two-layer structures of the hydrogen transport pipeline and the central pipeline.

9. The large-scale underwater constant pressure hydrogen storage device according to claim 1, characterized in that: The seawater ports are symmetrically arranged on the rigid air storage tank and the composite air-intake caisson; The seawater filter is a self-cleaning filter.

10. The large-scale underwater constant pressure hydrogen storage device according to claim 1, characterized in that: The upper layer of the composite suction caisson is the caisson foundation and is equipped with concrete weights and steel ring ribs, and the lower layer of the composite suction caisson is composed of a concrete outer wall and a steel skeleton; The composite suction caisson is also provided with lifting lugs.

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