Liquid hydrogen storage tank suitable for ocean platform

Abstract

The invention discloses a liquid hydrogen storage tank suitable for an ocean platform, and the liquid hydrogen storage tank comprises a tank body which comprises an inner spherical tank and an outer spherical tank, the inner spherical tank is concentrically arranged in the outer spherical tank, and a vacuum layer is formed between the inner spherical tank and the outer spherical tank; the multiple damping springs are arranged in the plane where the equatorial planes of the inner spherical tank and the outer spherical tank are located in the circumferential direction, and the two ends of each damping spring are connected with the outer side of the inner spherical tank and the inner side of the outer spherical tank correspondingly; the active vibration reduction device is arranged at the bottom of the outer spherical tank and comprises a supporting ring, active precession components and a base, the multiple active precession components are arranged on the base in the circumferential direction, the action end of each active precession component is connected with the supporting ring, and the bottom of the outer spherical tank is supported on the supporting ring; the active precession component is used for preventing external vibration from being transmitted to the outer spherical tank. When the liquid hydrogen storage tank stores liquid hydrogen on an ocean platform or in other ocean environments, the requirements for heat insulation performance and corrosion resistance of the stored liquid hydrogen can be met, and BOG generated by shaking of the storage tank is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid hydrogen storage tanks, and in particular, to a liquid hydrogen storage tank suitable for an offshore platform. Background Art

[0002] Liquid hydrogen is an efficient way of hydrogen storage with high volumetric hydrogen storage density and transportation efficiency. Cryogenic liquid hydrogen storage technology uses low temperature to liquefy hydrogen and store it in an insulated container. Large liquid hydrogen storage tanks are usually spherical double-shell structures, and the main considerations are the selection of materials with good mechanical properties, low-temperature durability, thermal cycle tolerance, and high insulation performance. They also need to have the ability to effectively isolate the cryogenic contents (liquid hydrogen) and perform temperature / pressure management to discharge and control the tank pressure and liquid hydrogen evaporation.

[0003] An offshore hydrogen production platform refers to a facility that uses renewable energy sources such as offshore wind power and solar energy to perform water electrolysis at sea, decompose seawater into hydrogen and oxygen, and collect hydrogen for storage and transportation. An offshore hydrogen production platform usually includes components such as a sealing system, a discharge piping system, an electrolyzer, a hydrogen storage tank, and pipes and cables connecting these components. With the development of offshore hydrogen production platforms, stable hydrogen storage equipment is considered a crucial factor.

[0004] Liquid hydrogen storage tanks usually adopt a double-wall design, with the inner container used to store liquid hydrogen and the outer layer used to keep warm and reduce heat conduction. These tanks are usually made of special alloys or composite materials to ensure that they can safely store liquid hydrogen at extremely low temperatures (the boiling point of liquid hydrogen is -252.9°C) and have good corrosion resistance.

[0005] At present, there are some problems in the practical application of traditional liquid hydrogen storage tanks. If they are to be used in the marine environment, they need to be considered more deeply: ① Traditional liquid hydrogen storage tanks are usually made of stainless steel. Due to the permeation of hydrogen, hydrogen atoms in the steel dissolve and become embrittled. Hydrogen embrittlement is unavoidable. Hydrogen embrittlement can easily cause cracks in the container, seriously affecting the stability of the container and reducing hydrogen storage efficiency and storage safety.

[0006] ② The temperature of liquid hydrogen during storage is extremely low, and there is a problem of evaporation loss during storage and transportation: part of the liquid hydrogen is converted into gaseous hydrogen, namely boil-off gas (hereinafter referred to as BOG), due to the influence of temperature increase, thereby reducing the hydrogen storage efficiency and safety. The evaporation of liquid hydrogen should be minimized.

[0007] ③In the marine environment, liquid hydrogen storage tanks are affected by factors such as salinity, humidity and chemicals, and are more prone to corrosion than in the land environment.

[0008] ④ The offshore platform shakes due to the influence of waves, currents, wind and other factors, which intensifies the evaporation of liquid hydrogen in the storage tank and affects storage safety. Summary of the invention

[0009] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a liquid hydrogen storage tank suitable for an offshore platform, which aims to enable the liquid hydrogen storage tank to meet the requirements of thermal insulation and corrosion resistance when storing liquid hydrogen on an offshore platform or other marine environment, and effectively reduce BOG generated by the shaking of the storage tank.

[0010] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a liquid hydrogen storage tank suitable for an offshore platform, comprising: a tank body, comprising an inner spherical tank and an outer spherical tank, the inner spherical tank being concentrically arranged inside the outer spherical tank, and a vacuum layer being formed between the inner spherical tank and the outer spherical tank; a vibration-damping spring, wherein a plurality of the vibration-damping springs are circumferentially arranged in a plane where the equatorial planes of the inner spherical tank and the outer spherical tank are located, and the two ends of the vibration-damping springs are respectively connected to the outer side of the inner spherical tank and the inner side of the outer spherical tank, so as to reduce the lateral shaking frequency and shaking amplitude of the inner spherical tank; an active vibration-damping device, arranged at the bottom of the outer spherical tank, comprising a support ring, an active precession component and a base, a plurality of the active precession components being circumferentially arranged on the base, and an action end of each of the active precession components being connected to the support ring, the bottom of the outer spherical tank being supported on the support ring, and the active precession component being used to prevent external vibration from being transmitted to the outer spherical tank.

[0011] Preferably: the axial cross-section of the support ring is in the shape of a circular ring, and a pressure sensing system is arranged on the inner side of the support ring; the active precession component comprises: a shell, the bottom of the shell is hinged on the base, and the top of the shell is connected to the support ring in double shear; a damping adjustment hydraulic rod and a spring device are arranged in the shell, the lower end of the spring device is connected in series with the action end of the damping adjustment hydraulic rod, and the upper end of the spring device is connected to the double shear connection between the shell and the support ring; a first angle adjustment hydraulic rod and a second angle adjustment hydraulic rod are symmetrically arranged on both sides of the shell, the first angle adjustment hydraulic rod and the second angle adjustment hydraulic rod are connected to the double shear connection between the shell and the support ring. The bottom of the hydraulic rod is hinged to the base, the action ends of the first angle adjustment hydraulic rod and the second angle adjustment hydraulic rod are hinged to the shell, and the straight line formed by the shell, the first angle adjustment hydraulic rod and the second angle adjustment hydraulic rod at the connection point of the base should pass through the projection point of the horizontal center point of the support ring on the bottom surface; a precession control device is arranged in the shell, and the precession control device is electrically connected to the pressure sensing system, and the precession control device is configured to actively control and adjust the length of the damping adjustment hydraulic rod, the first angle adjustment hydraulic rod and the second angle adjustment hydraulic rod according to the signal received from the pressure sensing system.

[0012] Preferably, the liquid hydrogen storage tank also includes a grounding device connected to the outer spherical tank, the grounding device includes a switch, a charge detector and a capacitor device, the switch is connected to the outer spherical tank via a wire, and a plurality of the capacitor devices are connected in parallel to the switch via the charge detector.

[0013] Preferably, the inner spherical tank comprises a first inner spherical shell and a second inner spherical shell, and the second inner spherical shell is arranged on the inner side of the first inner spherical shell relative to the center of the liquid hydrogen storage tank.

[0014] Preferably, the first inner spherical shell is made of ultra-low temperature steel, the second inner spherical shell is made of polytetrafluoroethylene polymer material, and a buffer layer is filled in the gap that may exist when the first inner spherical shell and the second inner spherical shell are assembled, and the buffer layer is made of titanium dioxide powder and carbon fiber composite material.

[0015] Preferably, the first inner spherical shell, the second inner spherical shell and the buffer layer are mechanically connected by a plurality of pins, and the pins are driven from the first inner spherical shell toward the center side of the liquid hydrogen storage tank, penetrate the first inner spherical shell and the buffer layer, and then penetrate into the second inner spherical shell, but do not penetrate the second inner spherical shell; and / or, The main body of the pin is made of ultra-low temperature steel, and a carbon fiber composite material or a glass fiber reinforced composite material is wound outside the main body of the pin.

[0016] Preferably: an antistatic sealing layer is arranged on the outer side of the first inner spherical shell relative to the center of the liquid hydrogen storage tank, and the material of the antistatic sealing layer is polytetrafluoroethylene coating or polyurethane coating; and / or, A heat insulation layer is arranged inside the outer spherical tank, and the heat insulation material is a multi-layer heat insulation material formed by composite silicate heat insulation cotton, granular or powdered material or fiber heat insulation material; and / or, An anti-corrosion and waterproof layer is arranged on the outer side of the outer spherical tank, and the anti-corrosion and waterproof layer is a hydrogen fluoride paint layer, an acrylic polyurethane paint layer or a polytetrafluoroethylene hydrophobic layer; and / or, A heat-insulating buffer layer is wrapped on the outside of the support ring, and the material of the heat-insulating buffer layer is EPS foam or polyurethane foam.

[0017] Preferably, a plurality of pressure sensors are arranged along the circumferential direction on the inner side of the large circular surface of the outer spherical tank for real-time monitoring of the vacuum degree of the vacuum layer and the leakage of hydrogen.

[0018] Preferably, an inner spherical tank support device is provided between the bottom of the inner spherical tank and the inner side of the outer spherical tank, the inner spherical tank support device is a truncated cone structure, has a structure gradually widening from the top to the bottom, and the upper end surface of the inner spherical tank support device is an inner concave curved surface matching the shape of the inner spherical tank; and / or, The inner spherical tank supporting device is a hollow structure made of glass fiber reinforced polyurethane composite material.

[0019] Preferably, the pressure sensing system comprises a flexible pressure sensor and a level sensor.

[0020] The present invention adopts the above technical solution, which has the following advantages: 1. The liquid hydrogen storage tank provided by the present invention is provided with an active vibration reduction device at the bottom of the outer spherical tank, which can actively adjust the support for the storage tank. At the same time, a number of vibration reduction springs are circumferentially arranged in the plane where the equatorial planes of the inner and outer spherical tanks are located, which can reduce the lateral shaking frequency and shaking amplitude of the inner spherical tank, thereby effectively reducing the shaking of the storage tank caused by factors such as waves and wind, so that the liquid hydrogen level in the inner spherical tank is in a horizontal position for a long time and the liquid level fluctuation is reduced, effectively reducing the BOG generated by the shaking of the storage tank, and improving the hydrogen storage efficiency.

[0021] 2. The liquid hydrogen storage tank provided by the present invention is provided with an inner spherical tank support device between the bottom of the inner spherical tank and the inner side of the outer spherical tank. The inner spherical tank support device is connected to the inner spherical tank, which structurally reduces the shaking amplitude of the inner spherical tank and further reduces the BOG generated by the shaking of the storage tank.

[0022] 3. The present invention takes into account the influence of electric charge caused by factors such as the marine environment (waves, sea breeze, etc.) and vibration reduction measures (vibration reduction springs, active vibration reduction devices, etc.), and equips the liquid hydrogen storage tank with a grounding device. The grounding device can effectively conduct the electric charge generated by the shaking of the storage tank or the vibration of the spring, and the inner spherical tank and the outer spherical tank are connected by a vibration reduction spring, which can also conduct the static electricity of the inner spherical tank and improve the safety of hydrogen storage.

[0023] 4. The second shell of the inner spherical tank of the liquid hydrogen storage tank provided by the present invention is made of polytetrafluoroethylene polymer material. The material has high crystallinity and low hydrogen molecule permeability, which can significantly improve the hydrogen molecule permeation problem and does not have the hydrogen embrittlement phenomenon existing in traditional metal materials. At the same time, the polytetrafluoroethylene material has low thermal conductivity and outstanding thermal insulation performance, has excellent thermal insulation effect, and improves the stability of stored liquid hydrogen.

[0024] 5. The first shell of the inner spherical tank of the liquid hydrogen storage tank provided by the present invention is made of ultra-low temperature steel, and the first shell, the second shell and the buffer layer are mechanically connected by multiple pins, which solves the problem that when only polytetrafluoroethylene polymer material is used as the inner tank, its mechanical strength is low and it cannot withstand high vacuum, and further improves the hydrogen storage performance of the liquid hydrogen storage tank.

[0025] 6. The liquid hydrogen storage tank provided by the present invention is provided with a plurality of pressure sensors along the circumferential direction at the intersection of the vacuum layer and the inner side of the outer spherical tank, so as to give an early warning for hydrogen leakage and monitor the real-time vacuum degree, thereby greatly improving the safety and stability of production operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings: Figure 1 A schematic diagram of the appearance structure of a liquid hydrogen storage tank provided in one embodiment of the present invention; Figure 2 A schematic diagram of the cross-sectional structure of a tank body provided by an embodiment of the present invention; Figure 3 A schematic diagram of the structure of an active vibration reduction device provided by an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a support ring provided in one embodiment of the present invention; Figure 5 A schematic diagram of the three-dimensional structure of an active precession component provided by an embodiment of the present invention; Figure 6 A cross-sectional view of an active precession component provided by an embodiment of the present invention; Figure 7 A schematic structural diagram of a grounding device provided in one embodiment of the present invention.

[0027] The reference numerals in the figures are as follows: 1-tank body; 2-active vibration reduction device; 3-grounding device; 4-inner spherical tank; 5-outer spherical tank; 6-vacuum layer; 7-first inner spherical shell; 8-second inner spherical shell; 9-buffer layer; 10-pin; 11-antistatic sealing layer; 12-thermal insulation layer; 13-anticorrosion and waterproof layer; 14-pressure sensor; 15-vibration reduction spring; 16-inner spherical tank support device; 17-support ring; 18-active precession component; 19-base; 20-thermal insulation buffer layer; 21-pressure sensing system; 22-flexible pressure sensor; 23-level sensor; 24-damping adjustment hydraulic rod; 25-spring device; 26-precession control device; 27-switch; 28-charge detector; 29-capacitor device; 30-housing; 31-first angle adjustment hydraulic rod; 32-second angle adjustment hydraulic rod. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present invention clearer, the specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0029] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0034] The liquid hydrogen storage tank suitable for an offshore platform provided by the present invention comprises: a tank body, comprising an inner spherical tank and an outer spherical tank, wherein the inner spherical tank is concentrically arranged inside the outer spherical tank, and a vacuum layer is formed between the inner spherical tank and the outer spherical tank; a damping spring, wherein a plurality of damping springs are circumferentially arranged in the plane where the equatorial planes of the inner spherical tank and the outer spherical tank are located, and the two ends of the damping springs are respectively connected to the outer side of the inner spherical tank and the inner side of the outer spherical tank; an active vibration reduction device, which is arranged at the bottom of the outer spherical tank, comprises a support ring, an active precession component and a base, wherein a plurality of active precession components are circumferentially arranged on the base, and the action end of each active precession component is connected to the support ring, the bottom of the outer spherical tank is supported on the support ring, and the active precession component is used to prevent external vibration from being transmitted to the outer spherical tank. The present invention enables the liquid hydrogen storage tank to meet the requirements of thermal insulation and corrosion resistance of storing liquid hydrogen when storing liquid hydrogen on an offshore platform or other marine environment, and effectively reduces BOG generated by the shaking of the storage tank.

[0035] The following is a detailed description of a liquid hydrogen storage tank applicable to an offshore platform provided in an embodiment of the present invention in conjunction with the accompanying drawings.

[0036] See also Figure 1 The liquid hydrogen storage tank provided by the present invention includes a tank body 1 and an active vibration reduction device 2.

[0037] See also Figure 2 The tank body 1 includes an inner spherical tank 4 and an outer spherical tank 5. The inner spherical tank 4 is cocentrically arranged inside the outer spherical tank 5, and a vacuum layer 6 is formed between the inner spherical tank 4 and the outer spherical tank 5. A plurality of damping springs 15 are arranged circumferentially in the plane where the equatorial planes of the inner spherical tank 4 and the outer spherical tank 5 are located. The two ends of the damping springs 15 are respectively connected to the outer side of the inner spherical tank 4 and the inner side of the outer spherical tank 5, so as to reduce the lateral shaking frequency and shaking amplitude of the inner spherical tank 4.

[0038] See also Figure 1 , Figure 3The active vibration reduction device 2 is arranged at the bottom of the outer spherical tank 5, including a support ring 17, an active precession component 18 and a base 19. Several active precession components 18 are arranged on the base 19 along the circumferential direction, and the action end of each active precession component 18 is connected to the support ring 17. The bottom of the outer spherical tank 5 is supported on the support ring 17. The active precession component 18 is used to prevent external vibration from being transmitted to the outer spherical tank 5.

[0039] In the above embodiments, preferably, please refer to Figure 4 The axial cross section of the support ring 17 is annular and made of stainless steel. A heat-insulating buffer layer 20 is wrapped on the outside of the support ring 17. The heat-insulating buffer layer 20 is made of a buffer composite material such as EPS foam and polyurethane foam to improve the thermal insulation performance and play a certain buffering role. A pressure sensing system 21 is arranged on the inside of the support ring 17. The pressure sensing system 21 includes a flexible pressure sensor 22 and a level sensor 23. Please refer to Figure 5 , Figure 6The active precession component 18 includes a damping adjustment hydraulic rod 24, a spring device 25, a precession control device 26, a housing 30, a first angle adjustment hydraulic rod 31 and a second angle adjustment hydraulic rod 32, wherein the bottom of the housing 30 is hinged on the base 19, and the top of the housing 30 is double-shear connected to the support ring 17; the damping adjustment hydraulic rod 24 and the spring device 25 are arranged in the housing 30, the lower end of the spring device 25 is connected in series with the action end of the damping adjustment hydraulic rod 24, and the upper end of the spring device 25 is connected to the double-shear connection between the housing 30 and the support ring 17 to play a vibration reduction role. The first angle adjustment hydraulic rod 31 and the second angle adjustment hydraulic rod 32 are symmetrically arranged on the inner and outer sides of the shell 30. The bottoms of the first angle adjustment hydraulic rod 31 and the second angle adjustment hydraulic rod 32 are hinged to the base 19, and the action ends of the first angle adjustment hydraulic rod 31 and the second angle adjustment hydraulic rod 32 are hinged to the shell 30. The straight line formed by the connection between the shell 30, the first angle adjustment hydraulic rod 31 and the second angle adjustment hydraulic rod 32 at the base 19 should pass through the projection point of the horizontal center point of the support ring 17 on the bottom surface 19. The precession control device 26 is disposed in the housing 30, and the precession control device 26 is electrically connected to the pressure sensing system 21. The precession control device 26 is configured to actively control and adjust the lengths of the damping adjustment hydraulic rod 24, the first angle adjustment hydraulic rod 31, and the second angle adjustment hydraulic rod 32 according to the received signal of the pressure sensing system 21, that is, by changing the length of the damping adjustment hydraulic rod 24, the length of the spring device 25 can be indirectly changed, thereby adjusting the damping of the spring device 25. At the same time, by changing the length of the first angle adjustment hydraulic rod 31 and the second angle adjustment hydraulic rod 32, the inclination angle of the housing 30 can be adjusted, thereby adjusting the angle between the active precession component 18 and the support ring 17, thereby actively reducing the shaking of the tank body 1 caused by factors such as waves and wind, so that the liquid hydrogen level in the inner spherical tank 4 is in a horizontal position for a long time and the liquid level fluctuation is reduced, so as to reduce the generation of BOG. ​​At the same time, when loading and unloading the liquid hydrogen storage tank, it can also provide good support, such as actively raising the position of the tank body 1 to facilitate loading and unloading.

[0040] In the above embodiments, preferably, please refer to Figure 1 , Figure 7 The liquid hydrogen storage tank also includes a grounding device 3 connected to the outer spherical tank 5. The grounding device 3 includes a switch 27, a charge detector 28 and a capacitor device 29. The switch 27 is connected to the outer spherical tank 5 through a wire. A plurality of capacitor devices 29 are connected in parallel to the switch 27 through the charge detector 28. The switch 27 should have a certain charge storage function to ensure safety when switching the capacitor devices. The grounding device 3 can effectively derive the charge generated by the shaking of the tank body 1 or the vibration of the spring, and the inner spherical tank 4 and the outer spherical tank 5 are connected by a damping spring 15, which can also derive the static electricity of the inner spherical tank 4 and improve the safety of hydrogen storage. Take two capacitor devices 29 (hereinafter referred to as capacitor A and capacitor B) as an example to illustrate the working principle of the grounding device 3: When the charge detector 28 detects that the charge in capacitor A reaches a threshold value, it sends a signal to the switch 27, and the switch 27 disconnects from capacitor A and connects to capacitor B, while draining the charge in capacitor A; when the charge detector 28 detects that the charge in capacitor B reaches a threshold value, it sends a signal to the switch 27, and the switch 27 disconnects from capacitor B and connects to capacitor A, while draining the charge in capacitor B; and this process is repeated. In particular, more than two capacitor devices 29 may be provided, and the principle is similar to the above process.

[0041] In the above embodiments, preferably, please refer to Figure 2 The inner spherical tank 4 includes a first inner spherical shell 7 and a second inner spherical shell 8, and the second inner spherical shell 8 is arranged on the inner side of the first inner spherical shell 7 relative to the center of the liquid hydrogen storage tank. Furthermore, the material of the first inner spherical shell 7 is ultra-low temperature steel, and the material of the second inner spherical shell 8 is a polytetrafluoroethylene polymer material. Therefore, adding a layer of polytetrafluoroethylene spherical shell in the ultra-low temperature steel spherical shell can reduce or even avoid hydrogen embrittlement, thereby improving safety by storing hydrogen. At the same time, a buffer layer 9 is also filled in the gap that may exist when the first inner spherical shell 7 and the second inner spherical shell 8 are assembled. The buffer layer 9 is made of titanium dioxide powder and carbon fiber composite material. Titanium dioxide powder, as a hydrogen molecule adsorbent, can effectively adsorb hydrogen molecules that penetrate from the second inner spherical shell 8, and the carbon fiber composite material can reinforce the second inner spherical shell 8, improve the mechanical strength of the second inner spherical shell 8, and also play a certain role in insulation, and can also avoid the friction between the first inner spherical shell 7 and the second inner spherical shell 8 that may be caused by the shaking of the liquid hydrogen storage tank.

[0042] In the above embodiment, preferably, please continue to refer to Figure 2 The first inner spherical shell 7, the second inner spherical shell 8 and the buffer layer 9 are mechanically connected by a plurality of pins 10, and the pins 10 are driven from the first inner spherical shell 7 to the center side of the liquid hydrogen storage tank, penetrate the first inner spherical shell 7 and the buffer layer 9, and then penetrate into the second inner spherical shell 8, but do not penetrate the second inner spherical shell 8. The main body of the pin 10 is made of ultra-low temperature steel, and a carbon fiber composite material or a glass fiber reinforced composite material is wound outside the main body of the pin 10 to ensure that it has good thermal insulation performance.

[0043] In the above embodiment, preferably, please continue to refer to Figure 2 An antistatic sealing layer 11 is provided on the outer side of the first inner spherical shell 7 relative to the center of the liquid hydrogen storage tank, and can be made of materials such as polytetrafluoroethylene coating, polyurethane coating, etc., to reduce the influence of static electricity generated by the damping spring 15 on the inner spherical tank 4. At the same time, the antistatic sealing layer 11 is required to be assembled after the pin mechanical connection of the first inner spherical shell 7, the second inner spherical shell 8 and the buffer layer 9 is completed, and is required to completely cover the insertion point of each pin 10 to prevent hydrogen from leaking from the pores at the insertion point of the pin 10 and improve the thermal insulation performance.

[0044] In the above embodiments, preferably, please continue to refer to Figure 2 A heat-insulating layer 12 is arranged on the inner side of the outer spherical tank 5. The heat-insulating material can be a multi-layer insulation material formed by composite silicate insulation cotton, granular or powdered materials (such as aerogel, vermiculite or similar materials) or fiber insulation materials (such as glass fiber or ceramic fiber composite materials or similar materials) to further improve the insulation performance; an anti-corrosion and waterproof layer 13 is arranged on the outer side of the outer spherical tank 5, such as hydrogen fluoride paint, acrylic polyurethane paint, polytetrafluoroethylene hydrophobic layer or other acid- and alkali-resistant anti-corrosion and waterproof coatings, to effectively cope with the complex and harsh marine environment.

[0045] In the above embodiments, preferably, please continue to refer to Figure 2 A plurality of pressure sensors 14 are arranged along the circumferential direction on the inner side of the large circular surface of the outer spherical tank 5 for real-time monitoring of the vacuum degree of the vacuum layer 6 and the leakage of hydrogen.

[0046] In the above embodiments, preferably, please continue to refer to Figure 2 An inner spherical tank support device 16 is provided between the bottom of the inner spherical tank 4 and the inner side of the outer spherical tank 5. The inner spherical tank support device 16 is a truncated cone structure, with a structure that gradually widens from the top to the bottom, and the upper end surface of the inner spherical tank support device 16 is an inner concave curved surface that matches the shape of the inner spherical tank 4, which can effectively support the weight load of the inner spherical tank 4 and structurally reduce the shaking amplitude of the inner spherical tank 4. At the same time, the inner spherical tank support device 16 is made of a glass fiber reinforced polyurethane composite material or other glass fiber reinforced polymer composite material with high strength and low thermal conductivity, and because liquid hydrogen has the characteristic of low weight, the inner spherical tank support device 16 can be designed as a hollow structure to save material costs.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A liquid hydrogen storage tank suitable for an offshore platform, characterized in that: include: The tank body comprises an inner spherical tank and an outer spherical tank, wherein the inner spherical tank is concentrically arranged inside the outer spherical tank, and a vacuum layer is formed between the inner spherical tank and the outer spherical tank; A plurality of damping springs are arranged along the circumferential direction in the plane where the equatorial planes of the inner spherical tank and the outer spherical tank are located, and the two ends of the damping springs are respectively connected to the outer side of the inner spherical tank and the inner side of the outer spherical tank, so as to reduce the lateral shaking frequency and shaking amplitude of the inner spherical tank; An active vibration reduction device is arranged at the bottom of the outer spherical tank, and includes a support ring, an active precession component and a base. Several active precession components are arranged on the base along the circumferential direction, and the action end of each active precession component is connected to the support ring. The bottom of the outer spherical tank is supported on the support ring. The active precession component is used to prevent external vibration from being transmitted to the outer spherical tank.

2. The liquid hydrogen storage tank according to claim 1, characterized in that: The axial cross section of the support ring is in the shape of a circular ring, and a pressure sensing system is arranged inside the support ring; The active precession component comprises: A shell, wherein the bottom of the shell is hinged on the base, and the top of the shell is connected to the support ring in double shear connection; A damping adjustment hydraulic rod and a spring device are arranged in the housing, the lower end of the spring device is connected in series with the action end of the damping adjustment hydraulic rod, and the upper end of the spring device is connected with the double shear connection of the housing and the support ring; The first angle adjustment hydraulic rod and the second angle adjustment hydraulic rod are symmetrically arranged on both sides of the shell, the bottoms of the first angle adjustment hydraulic rod and the second angle adjustment hydraulic rod are hinged to the base, the action ends of the first angle adjustment hydraulic rod and the second angle adjustment hydraulic rod are hinged to the shell, and the straight line formed by the shell, the first angle adjustment hydraulic rod and the second angle adjustment hydraulic rod at the connection of the base should pass through the projection point of the horizontal center point of the support ring on the bottom surface; A precession control device is disposed in the housing and is electrically connected to the pressure sensing system. The precession control device is configured to actively control and adjust the lengths of the damping adjustment hydraulic rod, the first angle adjustment hydraulic rod, and the second angle adjustment hydraulic rod according to the signal received from the pressure sensing system.

3. The liquid hydrogen storage tank according to claim 1, characterized in that: The liquid hydrogen storage tank also includes a grounding device connected to the outer spherical tank, and the grounding device includes a switch, a charge detector and a capacitor device. The switch is connected to the outer spherical tank through a wire, and a plurality of capacitor devices are connected in parallel to the switch through the charge detector.

4. The liquid hydrogen storage tank according to claim 1, characterized in that: The inner spherical tank includes a first inner spherical shell and a second inner spherical shell, wherein the second inner spherical shell is arranged on the inner side of the first inner spherical shell relative to the center of the liquid hydrogen storage tank.

5. The liquid hydrogen storage tank according to claim 4, characterized in that: The material of the first inner spherical shell is ultra-low temperature steel, the material of the second inner spherical shell is polytetrafluoroethylene polymer material, and a buffer layer is filled in the gap that may exist when the first inner spherical shell and the second inner spherical shell are assembled. The material of the buffer layer is titanium dioxide powder and carbon fiber composite material.

6. The liquid hydrogen storage tank according to claim 5, characterized in that: The first inner spherical shell, the second inner spherical shell and the buffer layer are mechanically connected by a plurality of pins, and the pins are driven from the first inner spherical shell toward the center side of the liquid hydrogen storage tank, penetrate the first inner spherical shell and the buffer layer, and then penetrate into the second inner spherical shell, but do not penetrate the second inner spherical shell; and / or, The main body of the pin is made of ultra-low temperature steel, and a carbon fiber composite material or a glass fiber reinforced composite material is wound outside the main body of the pin.

7. The liquid hydrogen storage tank according to claim 4, characterized in that: An antistatic sealing layer is arranged on the outer side of the first inner spherical shell relative to the center of the liquid hydrogen storage tank, and the material of the antistatic sealing layer is polytetrafluoroethylene coating or polyurethane coating; and / or, A heat insulation layer is arranged inside the outer spherical tank, and the heat insulation material is a multi-layer heat insulation material formed by composite silicate heat insulation cotton, granular or powdered material or fiber heat insulation material; and / or, An anti-corrosion and waterproof layer is arranged on the outer side of the outer spherical tank, and the anti-corrosion and waterproof layer is a hydrogen fluoride paint layer, an acrylic polyurethane paint layer or a polytetrafluoroethylene hydrophobic layer; and / or, A heat-insulating buffer layer is wrapped on the outside of the support ring, and the material of the heat-insulating buffer layer is EPS foam or polyurethane foam.

8. The liquid hydrogen storage tank according to claim 1, characterized in that: A plurality of pressure sensors are arranged along the circumferential direction on the inner side of the large circular surface of the outer spherical tank for real-time monitoring of the vacuum degree of the vacuum layer and the leakage of hydrogen.

9. The liquid hydrogen storage tank according to claim 1, characterized in that: An inner spherical tank support device is provided between the bottom of the inner spherical tank and the inner side of the outer spherical tank. The inner spherical tank support device is a truncated cone structure, having a structure gradually widening from the top to the bottom, and the upper end surface of the inner spherical tank support device is an inner concave curved surface matching the shape of the inner spherical tank; and / or, The inner spherical tank supporting device is a hollow structure made of glass fiber reinforced polyurethane composite material.

10. The liquid hydrogen storage tank according to claim 2, characterized in that: The pressure sensing system includes a flexible pressure sensor and a level sensor.

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