Large-scale underwater constant-pressure hydrogen storage device

Abstract

The application is suitable for 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 and the hydrogen supply network are connected 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 the hydrogen transportation pipeline is arranged in the rigid gas storage tank; a seawater port for inflow or outflow of seawater is further arranged at the bottom of the rigid gas storage tank; a seawater filter for filtering seawater is further arranged in the seawater port; and a storage tank flexible membrane for preventing compressed hydrogen from contacting seawater is further arranged in the rigid gas storage tank; the application can comprehensively solve the key technical problems faced by large-scale seabed hydrogen storage, promote the development of underwater hydrogen storage technology in the direction of higher efficiency, higher safety and lower cost, and contribute to the sustainable development of the hydrogen energy industry.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submarine hydrogen storage, and particularly relates to a large-scale underwater constant-pressure hydrogen storage device. BACKGROUND

[0002] With the in-depth development and utilization of marine resources, especially the breakthrough progress of seawater direct hydrogen production technology, large-scale marine hydrogen storage technology has emerged as the times require and shown great application potential and market demand. As a high-efficiency and clean energy carrier, hydrogen has the characteristics of low density, high diffusivity and low ignition point, which brings an energy revolution and also brings unprecedented challenges to the safe and efficient storage and transportation of hydrogen. Especially in the marine environment, how to overcome the natural environmental factors and realize the long-term, stable and safe storage of hydrogen has become a key problem to be solved in the development of hydrogen energy technology.

[0003] At present, the mainstream marine hydrogen storage technology mainly focuses on floating storage scheme. This technology arranges large hydrogen storage tanks on the sea surface to store and manage hydrogen by using the principle of buoyancy. However, this method faces multiple challenges and limitations in practice. First, the floating hydrogen storage tank is directly exposed to the harsh marine environment and is subjected to the impact and erosion of strong wind, huge waves and seasonal ice for a long time, which not only accelerates the aging and corrosion of the storage tank material, but also increases the maintenance cost and safety hazard. Secondly, floating storage relies on high-pressure gas storage tanks to improve the energy storage density of hydrogen, but due to the current level of material science and structural design, the stress intensity of high-pressure storage tanks becomes an important factor restricting the efficiency and safety of hydrogen storage. This means that in order to maintain sufficient energy storage density, more advanced and expensive storage tank materials and technologies must be used, further increasing the cost. In addition, the floating hydrogen storage scheme also has the problem of occupying a large amount of sea 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 marine space as a public resource is directly related to the sustainable development of multiple industries such as fishery production and marine transportation. The widespread deployment of floating hydrogen storage tanks will undoubtedly interfere with the marine ecological environment, limit the freedom of fishery activities, and even affect the smoothness and safety of sea routes, causing a series of social and economic problems.

[0004] Compared with offshore platform storage, although underwater storage can save valuable sea surface and nearshore space resources, the complex and variable geographical environment of the seabed (such as the undulating seabed topography and uneven distribution of seabed sediments) poses a serious challenge to the design and deployment of hydrogen storage facilities. Once the underwater hydrogen storage facility is deployed, its maintenance cost and technical difficulty are much higher than that of the sea surface facility. The deep sea environment has very high requirements for the corrosion resistance, sealing performance and remote monitoring capability of the equipment. In the deep water environment, the hydrostatic pressure rises sharply with the increase of water depth, which poses a great test to the structural strength and material performance of conventional large-scale gas storage tanks.

[0005] Therefore, in view of the above, it is urgent to provide a large-scale underwater constant-pressure hydrogen storage device to overcome the deficiencies in current practical applications. SUMMARY

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

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

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

[0009] 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 the hydrogen gas transportation pipeline is arranged in the rigid gas storage tank, a seawater port for inflow or outflow of seawater is further arranged at the bottom of the rigid gas storage tank, a seawater filter for filtering seawater is further arranged in the seawater port, and a tank flexible membrane for preventing compressed hydrogen from contacting seawater is further arranged in the rigid gas storage tank.

[0010] As a further scheme of the present application, a hydrogen inlet and outlet valve is arranged on the hydrogen gas supply network, and a low-pressure hydrogen conveying pipeline is connected with the hydrogen inlet and outlet valve on the hydrogen gas supply network, a hydrogen inlet and outlet valve is arranged on the hydrogen gas transportation pipeline, and the central pipeline is connected with the hydrogen inlet and outlet valve on the hydrogen gas transportation pipeline.

[0011] As a further scheme of the present application, 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 with the center position of the composite suction caisson.

[0012] As a further scheme of the present application, a protective layer is arranged 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 further arranged on the outer side of the protective layer, and the outer wall is made of improved concrete.

[0014] As a further scheme of the present application, a seawater monitoring device is arranged in the side wall of the rigid gas storage tank, the seawater monitoring device is arranged in a long size on both sides of the inside of the rigid gas storage tank, water level sensors are distributed on the seawater monitoring device according to scales, and the upper and lower ends of the water level sensors correspond to the highest position and the lowest position of the rigid gas storage tank, respectively.

[0015] As a further scheme of the present application, a temperature and pressure monitoring device is attached to the rigid gas storage tank.

[0016] As a further scheme of the present application: the flexible film of the storage tank is composed of an inner base material layer, a middle layer of heat insulation material and an outer layer of reinforcing material.

[0017] As a further scheme of the present application: the hydrogen transportation pipeline and the central pipeline are both of a two-layer structure, the inner layer is a high-steel-grade hydrogen-resistant pipe material and a hydrogen-resistant coating, and the outer layer is a glass steel and a seawater-resistant coating.

[0018] The two-layer structure of the hydrogen transportation pipeline and the central pipeline is both provided with a signal channel.

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

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

[0021] As a further scheme of the present application: the upper layer of the composite suction caisson is a caisson foundation, and is provided with a concrete weight and a steel ring rib, 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 further provided with an ear.

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

[0024] 1. The present application takes the composite suction caisson as a base, links the cableway for integrated seabed installation and recovery, improves the efficiency of hydrogen storage device implementation and maintenance, and overcomes geographical limitations.

[0025] 2. The present application has a simple structure, and the input and output of hydrogen can be completed through a group of pipelines, thereby saving cost and facilitating daily maintenance. The rigid gas storage tank adopts an improved concrete outer wall, which meets the compression requirement and provides a lower cost requirement, thereby being beneficial to improving the commercial feasibility of underwater hydrogen storage.

[0026] 3. The rigid gas storage tank and the composite suction caisson of the present application can independently adjust the pressure through the seawater ports, keep the hydrogen pressure inside the device the same as the hydrostatic pressure of the corresponding water depth, reduce the strength requirement and fatigue loss of the rigid gas storage tank and the composite suction caisson, and improve the stability of long-term hydrogen storage. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic view of the present application.

[0028] Figure 2 It is a structural schematic view of the composite suction caisson in the present application.

[0029] Figure 3It is a local section structure schematic view of the rigid gas tank in the application.

[0030] Figure 4 It is a structure schematic view of the seawater filter in the application.

[0031] Figure 5 It is a working state schematic view of the application.

[0032] Figure 6 It is a working flow chart of the application.

[0033] In the drawing: hydrogen gas supply network 1, hydrogen gas transportation pipeline 2, rigid gas tank 3, tank flexible film 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 screen 42, hydraulic motor 43, differential pressure sensor 44, blowdown valve 45, blowdown pipe 46, fine filter screen 47, suction nozzle 48, water outlet 49. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the application. The specific implementation of the application is described in detail below in combination with specific embodiments.

[0035] Please refer to Figures 1-6 The large-scale underwater constant-pressure hydrogen storage device provided by the embodiments of the application comprises:

[0036] The hydrogen storage tank 11, the hydrogen gas supply network 1 and the hydrogen gas transportation pipeline 2 are connected through the hydrogen gas transportation pipeline 2 between the hydrogen storage tank 11 and the hydrogen gas supply network 1.

[0037] The hydrogen storage tank 11 comprises a rigid gas tank 3 and a composite suction caisson 8 arranged at the bottom of the rigid gas tank 3. The rigid gas tank 3 is internally provided with a central pipeline 5 connected with the hydrogen gas transportation pipeline 2. The bottom of the rigid gas tank 3 is further provided with a seawater port 6 for inflow or outflow of seawater, and the seawater port 6 is further provided with a seawater filter 7 for filtering seawater. The rigid gas tank 3 is further internally provided with a tank flexible film 4 for preventing compressed hydrogen gas from contacting seawater.

[0038] The hydrogen gas supply network 1 is provided with hydrogen inlet and outlet valves, and the hydrogen inlet and outlet valves on the hydrogen gas supply network 1 are connected with low-pressure hydrogen conveying pipelines; the hydrogen conveying pipeline 2 is provided with hydrogen inlet and outlet valves, and the central pipeline 5 is connected with the hydrogen inlet and outlet valves on the hydrogen conveying 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 with the center position of the composite suction caisson.

[0040] In the embodiment of the present application, the hydrogen gas supply network 1 connects the hydrogen gas prepared at sea to the hydrogen conveying pipeline 2, the hydrogen conveying pipeline 2 conveys the hydrogen gas to the hydrogen storage tank 11, the rigid gas storage tank 3 is used for storing the main body of compressed hydrogen gas, the central pipeline 5 is used for maintaining the shape of the storage tank flexible membrane 4, conveying hydrogen gas and facilitating replacement of the damaged storage tank flexible membrane 4; the seawater filter 7 is used for connecting the seawater port and external seawater, keeping the seawater in the hydrogen storage device pure, and the composite suction caisson 8 is used for stabilizing the overall 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 gas 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, the hydrogen gas prepared at sea is concentrated in the hydrogen gas supply network 1 and input into the hydrogen conveying pipeline 2, the hydrogen conveying pipeline 2 is connected to the central pipeline 5, and in 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 gas and the internal seawater are separated by the storage tank flexible membrane 4, 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 amount reaches the maximum value; after the inflation is completed, the hydrogen storage tank 11 is suspended at the sinking position 13 which is h away from the sea level, 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, and the internal and external pressure balance state is maintained; during the hydrogen release process, the hydrogen outlet valve is opened, and the stored compressed hydrogen gas is sequentially released through the central pipeline 5, the hydrogen conveying pipeline 2 and the hydrogen gas supply network 1. In this stage, the internal pressure and mass of the hydrogen storage tank 11 decrease, the internal gas pressure of 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 demand of hydrogen storage amount and hydrogen release amount, the hydrogen storage tank 11 can be suspended at any position from the sea level to h.

[0042] In one embodiment of the present application, please refer to Figures 1-6 The outer side of the side wall 31 of the rigid gas storage tank 3 is provided with a protective layer 32 for maintaining the temperature of the hydrogen gas in the gas storage tank, the protective layer 32 is made of polyurethane and rubber materials, has excellent heat preservation performance, waterproof performance and corrosion resistance;

[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, which is made of fiber reinforced polymer and sustainable alkali activated cementitious material, has high compressive strength and low cost advantage;

[0044] The seawater monitoring device 34 is arranged in the side wall 31 of the rigid gas tank 3, which can monitor the depth of the seawater in the rigid gas tank, and the seawater monitoring device 34 is arranged on both sides of the rigid gas tank 3 in a long size, and the water level sensor is distributed on the seawater monitoring device 34 according to the scale, and 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 tank 3 respectively, and the water level of the continuous measuring electrode is measured through the water conductivity between the gas-liquid interface 36 in the rigid gas tank 3 and the bottom of the rigid gas tank 3, and the seawater height in the rigid gas tank is monitored, and the seawater monitoring device is made of high sealing material, and glass fiber reinforced plastic is used as the protective outer layer, which will not be affected by the seawater environment;

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

[0046] In an embodiment of the present application, please refer to Figure 1 The flexible membrane 4 of the storage tank is composed of an inner base material layer, a middle layer of heat insulation material and an outer layer of reinforcing material, which ensures effective sealing and flexibility, and strictly prevents the direct contact and heat exchange between the stored hydrogen and the internal seawater in the rigid gas tank.

[0047] In an embodiment of the present application, please refer to 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 hydrogen-resistant pipe material and a hydrogen-resistant coating, and the outer layer is glass fiber reinforced plastic and a seawater-resistant coating;

[0048] The two-layer structure of the hydrogen transport pipeline 2 and the central pipeline 5 is provided with a signal channel, which is responsible for transmitting signals in the hydrogen storage device to the upper control port and conveying instructions of the upper control port to the hydrogen storage device.

[0049] In an embodiment of the present application, please refer to Figures 1-6 The seawater ports 6 are symmetrically arranged on the rigid gas tank 3 and the composite suction caisson 8 respectively, which maintains the communication between the internal seawater and the external seawater, and the seawater ports 6 are both equipped with seawater filters 7.

[0050] The seawater filter 7 is a self-cleaning filter, which can keep the seawater filter stable on the seabed for a long time, purify the external seawater flowing into the hydrogen storage device, and maintain the stability of the internal environment of the rigid gas 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 are gradually accumulated, a hydraulic valve is opened through pressure difference, sewage on the fine filter screen is sucked by a suction nozzle, and the sewage is discharged from a sewage discharge valve by a hydraulic motor, so that a sewage suction process is formed, and the normal filtering work of the filter is uninterrupted. At the same time, when the internal seawater flows out, the impurities on the filter screen are also taken out.

[0051] In the embodiment, the working mode of the seawater filter is as follows: water enters the self-cleaning filter from the water inlet 41, large-particle impurities are filtered by the coarse filter screen 42, and small-particle impurities are filtered by the fine filter screen 47, 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 on the filter screen are gradually accumulated, a sewage discharge valve 45 is opened through pressure difference, a pressure difference sensor 44 is arranged in the self-cleaning filter, sewage inside the fine filter screen 47 and the coarse filter screen 42 is sucked by a suction nozzle 48, and the sewage is discharged from a sewage discharge pipe 46 by a hydraulic motor 43, so that a sewage suction process is formed, and the normal filtering work of the self-cleaning filter is uninterrupted; during the hydrogen storage process, internal seawater flows in from the water outlet 49, the sewage discharge valve 45 is opened, the suction nozzle 48 works, and further cleaning is performed, and meanwhile, impurities on the outside of the coarse filter screen 42 are also taken out by the water flow;

[0052] The composite suction caisson 8 is integrally connected with the rigid gas tank 3, eight seawater ports 6 are arranged to keep the pressure stable, the existence of the eight seawater ports 6 allows seawater to flow in and out, keeps the pressure of the composite suction caisson 8 at the hydrostatic pressure of the corresponding water depth, reduces the impact of external seawater on the composite suction caisson 8, improves the service life of the composite suction caisson 8, and improves the stability of the whole device.

[0053] In an embodiment of the present application, please refer to Figures 1-6 , the upper layer of the composite suction caisson 8 is a caisson foundation, and is provided with a concrete weight 21 and a steel ribbed ring 22, the lower layer of the composite suction caisson 8 is composed of a concrete outer wall and a steel skeleton, and the internal space is used to store seawater and is connected with external seawater through the seawater ports;

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

[0055] In summary, the present application effectively overcomes the geographical limitations of the seabed, enabling efficient space utilization in complex seabed environments. Combined with remote monitoring and fault diagnosis technology, the maintainability and operational efficiency of underwater hydrogen storage facilities are significantly improved, reducing long-term maintenance costs. The present application innovatively proposes a constant-pressure hydrogen storage mechanism with internal gas pressure equivalent to the static water pressure of the corresponding water depth, which not only avoids the risk of structural damage due to excessive internal and external pressure differences, but also optimizes the structural design to enable the hydrogen storage device to maintain a long-term stable operating state in extreme deep water conditions, thereby meeting the stringent strength requirements in deep water environments. Through the comprehensive application of the above technical innovations, the safety and reliability of underwater hydrogen storage are significantly improved, and the overall cost of offshore hydrogen production and storage is reduced through optimized cost structure, laying a solid economic foundation for the widespread application of underwater hydrogen storage technology and improving its commercial viability.

[0056] The present application aims to comprehensively solve the key technical problems faced by large-scale seabed hydrogen storage through a series of technical innovations, promoting the development of underwater hydrogen storage technology towards higher efficiency, greater safety, and more economic direction, and contributing to the sustainable development of the hydrogen energy industry.

[0057] In the present application, unless otherwise explicitly specified and limited, the terms "sliding", "rotating", "fixed", "provided with" and other terms should be broadly understood, for example, can be welded connection, or bolted connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0058] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

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, the hydrogen storage tank being connected to the hydrogen supply network via the hydrogen transport pipeline, characterized in that, 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 gas transportation pipeline is arranged in the rigid gas storage tank, a seawater port for inflow or outflow of seawater is further arranged at the bottom of the rigid gas storage tank, a seawater filter for filtering seawater is further arranged in the seawater port, and a tank flexible film for preventing compressed hydrogen from contacting seawater is further arranged in the rigid gas storage tank. The composite suction caisson is connected with the rigid gas storage tank, the seawater port is arranged to keep the pressure stable, and the seawater port allows seawater to flow in and out; seawater is stored in the internal space of the composite suction caisson; after the inflation is completed, the hydrogen storage tank is suspended at a sinking position with a distance of h from the sea level, at this time, the internal pressure of the rigid gas storage tank is equal to the hydrostatic pressure outside the rigid gas storage tank, and the internal and external pressure balance state is maintained; according to the demand of hydrogen storage amount and hydrogen release amount, the hydrogen storage tank can be suspended at any position from the sea level to h.

2. The large-scale underwater constant-pressure hydrogen storage device according to claim 1, wherein A hydrogen inlet and outlet valve is arranged on the hydrogen gas supply network, and a low-pressure hydrogen conveying pipeline is connected with the hydrogen inlet and outlet valve on the hydrogen gas supply network; a hydrogen inlet and outlet valve is arranged on the hydrogen gas transportation pipeline, and the central pipeline is connected with the hydrogen inlet and outlet valve on the hydrogen gas transportation pipeline.

3. The large-scale underwater constant pressure hydrogen storage device according to claim 1, wherein 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 with the center position of the composite suction caisson.

4. The large-scale underwater constant pressure hydrogen storage device according to claim 1, wherein A protective layer is arranged 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 further 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, wherein A seawater monitoring device is arranged in the side wall of the rigid gas storage tank, the seawater monitoring device is arranged in a long size on both sides of the internal side of the rigid gas storage tank, water level sensors are distributed on the seawater monitoring device according to scales, and the upper and lower ends of the water level sensors 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, wherein A temperature and pressure monitoring device is attached to the rigid gas storage tank.

7. The large-scale underwater constant pressure hydrogen storage device according to claim 1, wherein The tank flexible film is composed of an internal base material layer, a middle layer thermal insulation material and an outer layer reinforcing material.

8. The large-scale underwater constant pressure hydrogen storage device according to claim 1, wherein The hydrogen gas transportation pipeline and the central pipeline both adopt a two-layer structure, the inner layer is a high-grade hydrogen-resistant pipe material and a hydrogen-resistant coating, and the outer layer is glass steel and a seawater-resistant coating; Signal channels are arranged between the two-layer structures of the hydrogen gas transportation pipeline and the central pipeline.

9. The large-scale underwater constant pressure hydrogen storage device according to claim 1, wherein The seawater ports are symmetrically arranged on the rigid gas storage tank and the composite suction caisson respectively; The seawater filter is a self-cleaning filter.

10. The large-scale underwater constant pressure hydrogen storage device according to claim 1, wherein The upper layer of the composite suction caisson is a caisson foundation, and is provided with a concrete weight and a steel ribbed ring; the lower layer of the composite suction caisson is composed of a concrete outer wall and a steel skeleton; Lifting lugs are further arranged on the composite suction caisson.

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