Liquid hydrogen storage equipment with cold screen space partition

Abstract

The present invention discloses a liquid hydrogen storage device with cold shield space partition, including a liquid hydrogen storage tank, an external insulation layer and a cold shield space, wherein the liquid hydrogen storage tank is covered with an external insulation layer, and the space formed between the liquid hydrogen storage tank and the external insulation layer is the cold shield space; a secondary normal converter, a connecting support, a cooling coil and a cold shield space partition are arranged in the cold shield space, wherein the secondary normal converter is located at the lower part of the liquid hydrogen storage tank and is connected to the cooling coil, and the cooling coil is located above the secondary normal converter; a gaseous hydrogen outlet is arranged at the top of the liquid hydrogen storage tank, and the gaseous hydrogen outlet is connected to the secondary normal converter through a pipeline. The liquid hydrogen storage device with cold shield partition provided by the present invention maximizes the use of the cold energy generated by the secondary normal conversion of gaseous hydrogen, solves the heat leakage phenomenon in the liquid hydrogen storage process, reduces the liquid hydrogen loss caused by the gasification of liquid hydrogen and other problems, and prolongs the storage time of liquid hydrogen.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid hydrogen storage, and in particular relates to a liquid hydrogen storage device with cold shield space partitions. Background Art

[0002] Hydrogen is in gaseous state at room temperature and pressure, and its density is very small. Compared with other fuels, hydrogen has a large mass energy density, but a small volume energy density (1 / 3000 of gasoline). Therefore, a major prerequisite for building a hydrogen energy storage system is to store hydrogen at a higher volume energy density. At present, the main methods of hydrogen storage are high-pressure gaseous hydrogen storage, liquefied hydrogen storage, glass microsphere hydrogen storage, metal hydride hydrogen storage, carbonaceous adsorption hydrogen storage, organic liquid hydrogen storage, etc. The most widely used hydrogen storage method is high-pressure gaseous hydrogen storage, mainly because it has less pollution to the environment and has good economy, but the gas tank is very heavy, the unit hydrogen storage density is small, and the hydrogen storage efficiency is low; the energy density of liquefied hydrogen storage is very high, and the efficiency can reach 93%, but due to the expensive storage cost, it is mainly used in the aerospace field; metal hydride hydrogen storage has the highest volume density among all hydrogen storage methods, which can reach 100kg / m 3 , but it has a relatively large mass, resulting in higher costs than compression storage; the key to carbonaceous adsorption hydrogen storage is to study the improvement of adsorption capacity, which is usually carried out at normal pressure and temperature. Although some progress has been made in many aspects, including purification of adsorbents and synthesis of adsorbents, they are just getting started. The defects in the transportation and storage technology of liquid hydrogen have seriously restricted the development of my country's liquid hydrogen industry. Since my country's liquid hydrogen is currently mainly used in the aerospace field, large-scale civilian use is difficult, so it is necessary to develop a liquid hydrogen storage and transportation technology and research.

[0003] Among the various hydrogen storage technologies mentioned above, low-temperature liquefied hydrogen storage is a practical hydrogen storage method. The boiling point of hydrogen at normal pressure is 20.27K, and the density at this time is 70.79kg / m 3 , which is 789 times that of gaseous hydrogen at room temperature and pressure. Therefore, cryogenic liquefied hydrogen storage has the advantages of high hydrogen storage density and small storage container volume. Its mass concentration is about 70g / L, which is higher than high-pressure gaseous hydrogen storage (the mass concentration is about 39g / L at 70MPa). However, the hydrogen liquefaction process requires multi-stage compression cooling, and the hydrogen temperature is reduced to 20K. In order to avoid the evaporation loss of liquid hydrogen, the insulation performance of the liquid hydrogen storage container is demanding, and insulation materials with good insulation performance are required, resulting in high material costs and complex design and manufacturing of cryogenic hydrogen storage tanks. At present, cryogenic liquefied hydrogen storage technology is mainly used in the military and aerospace fields, and commercial research and application have just begun. The hydrogen storage process often has defects such as severe loss of cold, expensive storage equipment, and loss of liquid hydrogen caused by liquid hydrogen gasification.

[0004] Patent CN105889748A discloses a non-destructive storage device for liquid hydrogen based on parahydrogen conversion, and its working principle is: liquid hydrogen will continue to evaporate in the storage tank due to heat leakage, causing the pressure in the storage tank to rise, so that part of the parahydrogen is converted into orthohydrogen under the action of the catalyst in the parahydrogen converter, absorbing heat and reducing the evaporation loss of liquid hydrogen. However, the use of this para-ortho converter inside the storage tank to provide cold for liquid hydrogen storage will cause the liquid hydrogen at the wall of the storage tank to have a slightly higher temperature and a lower density due to heat leakage, while the temperature of the converted liquid hydrogen is low and the density is large, and the liquid hydrogen will form a disturbance cycle, causing the thermal stratification phenomenon in the storage tank to aggravate local evaporation, resulting in excessively fast pressure growth in the storage tank, resulting in increased losses. On the other hand, the cold loss phenomenon at the connection of the insulation storage tank shell is relatively serious, and there is still no good measure to effectively avoid it at this stage.

[0005] It is necessary to propose a method that can utilize the cold energy generated by Zhongzheng conversion to provide key protection for the connection parts of the storage tank and to reasonably divide and utilize the cold energy generated by Zhongzheng conversion. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a liquid hydrogen storage device with a cold shield partition, which provides a cold shield for the liquid hydrogen storage device through the parahydrogen-orthohydrogen conversion process, isolates the energy loss in the liquid hydrogen storage problem, and uses the space partition method within the cold shield to rationally utilize the cold energy of the parahydrogen-orthohydrogen conversion, blocks the heat leakage at the connection between the storage tank and the insulation shell, and the structural development of the liquid hydrogen storage tank is suitable for equipment for long-term storage of liquid hydrogen, and minimizes the loss of liquid hydrogen caused by thermal stratification.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A liquid hydrogen storage device with cold shield space partition, comprising a liquid hydrogen storage tank, an external insulation layer and a cold shield space, wherein the liquid hydrogen storage tank is covered with an external insulation layer, and the space formed between the liquid hydrogen storage tank and the external insulation layer is the cold shield space; a secondary normal converter, a connecting support, a cooling coil and a cold shield space partition are arranged in the cold shield space, the secondary normal converter is located at the lower part of the liquid hydrogen storage tank and is connected to the cooling coil, and the cooling coil is located above the secondary normal converter; a gaseous hydrogen outlet is arranged at the top of the liquid hydrogen storage tank, and the gaseous hydrogen outlet is connected to the secondary normal converter through a pipeline.

[0009] Hydrogen molecules are divided into two spin isomers, orthohydrogen and parahydrogen, due to the different spin directions of the two atomic nuclei. The equilibrium concentration of orthohydrogen and parahydrogen in hydrogen is affected by temperature. As the temperature decreases, orthohydrogen will be converted into parahydrogen, and the molecular energy level of orthohydrogen is higher than that of parahydrogen, that is, the orthohydrogen conversion process releases heat; on the contrary, during the storage of liquid hydrogen, the conversion of parahydrogen into orthohydrogen can absorb heat, so the parahydrogen discharged from the liquid hydrogen storage tank can be utilized to extend the storage time of liquid hydrogen.

[0010] The secondary hydrogen content in the liquid hydrogen in the liquid hydrogen storage tank needs to be maintained above 95%. The liquid hydrogen inside the liquid hydrogen storage tank is gasified and then drawn out of the storage tank to undergo a secondary normal reaction. The reaction temperature is 50-100K. The liquid hydrogen storage tank and the external insulation layer are vacuum treated and filled with variable density multi-layer insulation materials for insulation to achieve the effect of extremely small heat leakage, so as to ensure that the temperature of the cold screen does not rise and is within the secondary normal conversion reaction temperature.

[0011] Specifically, after the gaseous hydrogen in the liquid hydrogen storage tank is discharged from the storage tank, it passes through the secondary positive converter and releases cold energy in the cooling coil outside the storage tank, providing thermal protection for the storage tank, thereby balancing the environmental heat leakage outside the storage tank and extending the storage time of the liquid hydrogen in the liquid hydrogen storage tank.

[0012] Preferably, the lower part of the liquid hydrogen storage tank is fixedly connected to the external insulation layer through the connecting support; the liquid hydrogen storage tank is also provided with a liquid hydrogen inlet and a liquid hydrogen outlet; the connecting support is a cylinder, and the number is 3-5.

[0013] Preferably, an exhaust port is provided at the end of the cooling coil, and the exhaust port is connected to the external atmosphere.

[0014] Specifically, the cold shield space is outside the entire liquid hydrogen storage tank and needs to be vacuum treated.

[0015] Preferably, the vacuum degree in the cold shield space is not greater than 500 Pa.

[0016] Preferably, the secondary normal converter is a tubular reactor, and the secondary normal converter is installed on the outer wall of the liquid hydrogen storage tank, or the outer insulation inner wall, and is coiled on the outside of the connecting support.

[0017] Preferably, the cold shield space partition is in a circular ring shape and is located between the secondary positive converter and the cooling coil, which divides the cold shield space into a lower connection support protection area and an upper cold shield heat exchange protection area.

[0018] Specifically, the secondary positive converter is surrounded by the supporting connection components of the liquid hydrogen storage tank and the external insulation layer to avoid heat leakage at the connection point.

[0019] Preferably, the vacuum degree of the connection support protection zone is not greater than 500 Pa, the vacuum degree of the cold screen heat exchange protection zone is not greater than 200 Pa, and the vacuum degree of the cold screen heat exchange protection zone is less than the vacuum degree of the connection support protection zone.

[0020] Preferably, the cooling coil is wound around the outer wall of the liquid hydrogen storage tank, and may also be arranged on the inner wall of the cold shield space that is insulated internally and externally.

[0021] Preferably, the liquid hydrogen storage tank is a spherical tank, a cylindrical tank or a storage tank with a hemispherical head; the external insulation layer is a spherical tank, a cylindrical tank or a storage tank with a hemispherical head.

[0022] Preferably, the secondary normal conversion reactor is filled with a hydrogen secondary normal conversion catalyst.

[0023] The cooling coil is located in the cold shield space and is connected to the Zhongzheng converter. The gaseous hydrogen coming out of the liquid hydrogen storage tank generates a large amount of cold energy after passing through the Zhongzheng converter. Part of the cold energy is used to compensate for heat leakage at the connection support, and the excess cold energy provides effective insulation for most of the cold shield space through the cooling coil.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The cold shield partitioned liquid hydrogen storage device provided by the present invention can absorb heat by converting parahydrogen into orthhydrogen. Therefore, the parahydrogen discharged from the liquid hydrogen storage tank can be utilized to extend the storage time of liquid hydrogen. The para-orthhydrogen converter is arranged at the connection support outside the liquid hydrogen storage tank, which can not only provide a cold shield for the liquid hydrogen storage tank equipment and isolate the energy loss in the liquid hydrogen storage problem, but also block the heat leakage phenomenon at the connection between the liquid hydrogen storage tank and the external insulation layer. At the same time, it can also reduce the disturbance circulation of liquid hydrogen caused by the para-orthhydrogen converter inside the storage tank, thereby causing the thermal stratification phenomenon in the storage tank to aggravate local evaporation and cause the pressure in the storage tank to increase too fast, resulting in increased losses.

[0026] (2) The liquid hydrogen storage equipment with cold shield partitions provided by the present invention performs different vacuum treatments on the cold shield space according to its function, makes rational use of the cold energy generated by the secondary normal conversion, and minimizes the loss of liquid hydrogen; the secondary normal conversion area uses gaseous hydrogen to continuously generate cold energy to protect the connection support between the liquid hydrogen storage tank and the outer insulation layer from heat leakage, thereby avoiding the accelerated heat loss caused by the flow of liquid hydrogen due to local heat; the cold shield heat exchange protection area has no connection heat leakage phenomenon, and relies on cooling coils to utilize the excess cold energy of the secondary normal conversion for cold shield protection.

[0027] (3) The liquid hydrogen storage device with cold shield partitions provided by the present invention has a simple structure, makes rational use of the cold energy generated by the secondary normal reaction, partitions the cold shield space according to function, maximizes the secondary normal conversion of gaseous hydrogen, solves the heat leakage phenomenon in the liquid hydrogen storage process, reduces the loss of liquid hydrogen caused by the gasification of liquid hydrogen, and prolongs the storage time of liquid hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the liquid hydrogen storage device with cold shield space partitioning according to Example 1 of the present invention.

[0029] Among them, 1. Liquid hydrogen storage tank; 2. External insulation layer; 3. Secondary positive converter; 4. Cooling coil; 5. Cold shield space; 6. Exhaust port; 7. Connection support; 8. Cold shield space partition; 9. Gaseous hydrogen outlet. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of 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.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0035] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0036] like Figure 1As shown, a liquid hydrogen storage device with cold shield space partition includes a liquid hydrogen storage tank 1, an external insulation layer 2 and a cold shield space 5, wherein the liquid hydrogen storage tank 1 is covered with an external insulation layer 2, and the space formed between the liquid hydrogen storage tank 1 and the external insulation layer 2 is the cold shield space 5; a secondary normal converter 3, a connecting support 7, a cooling coil 4 and a cold shield space partition 8 are arranged in the cold shield space 5, the secondary normal converter 3 is located at the lower part of the liquid hydrogen storage tank 1 and is connected to the cooling coil 4, and the cooling coil 4 is located above the secondary normal converter 3; a gaseous hydrogen outlet 9 is arranged at the top of the liquid hydrogen storage tank 1, and the gaseous hydrogen outlet 9 is connected to the secondary normal converter 3 through a pipeline.

[0037] Preferably, the liquid hydrogen storage tank 1 is made of 304 stainless steel, and the external insulation layer 2 is made of 16MnR.

[0038] Specifically, the cold shield space 5 provides a barrier for liquid hydrogen storage to be isolated from the outside world, thereby preventing the loss of liquid hydrogen from gasification due to the loss of cold in the liquid hydrogen storage tank 1 .

[0039] Preferably, the lower part of the liquid hydrogen storage tank 1 is fixedly connected to the external insulation layer 2 through the connecting support 7; the liquid hydrogen storage tank 1 is also provided with a liquid hydrogen inlet and a liquid hydrogen outlet; the connecting support 7 is a cylinder, and the number is 3-5.

[0040] Specifically, the liquid hydrogen storage tank 1 is a direct device for storing liquid hydrogen. The lower part of the liquid hydrogen storage tank 1 contains liquid hydrogen, and a certain amount of gaseous hydrogen exists in the top head.

[0041] Preferably, an exhaust port 6 is provided at the end of the cooling coil 4, and the exhaust port 6 is connected to the external atmosphere.

[0042] Preferably, the vacuum degree in the cold shield space 5 is not greater than 500 Pa.

[0043] Preferably, the secondary positive converter 3 is a tubular reactor, which is coiled on the outside of the connecting support 7, and can be specifically installed on the outer wall of the connecting support or the inner wall of the external insulation layer 2 to effectively prevent heat loss at the connecting support 7.

[0044] Preferably, the cold shield space partition 8 is in a circular ring shape and is located between the secondary positive converter 3 and the cooling coil 4, which divides the cold shield space 5 into a lower connection support protection area and an upper cold shield heat exchange protection area.

[0045] Specifically, the cold shield space partition 8 has good sealing performance, ensuring that the two parts in the cold shield space are relatively independent.

[0046] Preferably, the overall vacuum degree of the connection support protection area and the cold screen heat exchange protection area in the cold screen space 5 is required to be no more than 500 Pa (absolute pressure). Since the cold screen heat exchange protection area relies on excess cold and vacuum for heat insulation, the vacuum degree requirement for this part is relatively high, and the vacuum degree is required to be no more than 200 Pa (absolute pressure).

[0047] Specifically, according to different functions, the cold shield space partition 8 divides the cold shield space 5 into a lower connection support protection area and an upper cold shield heat exchange protection area. In the connection support protection area, heat leakage is mainly protected by the heat absorption of the secondary normal conversion reaction. Since the connection support 7 is a solid and transfers heat, the loss of cold is large, so the secondary normal reaction heat absorption is used for protection; this part of the space in the cold shield heat exchange protection area has a certain degree of vacuum and has no solid connectors. The excess cold after the secondary normal reaction is used for heat exchange in this area to meet the effect of isolating external heat.

[0048] Preferably, the cooling coil 4 is wound around the outer wall of the liquid hydrogen storage tank 1, and may also be arranged on the inner wall of the cold shield space that is insulated externally.

[0049] Specifically, the structure of the cooling coil 4 is a tubular heat exchanger, and the diameter of the cooling coil 4 and the secondary converter 3 can be the same or different.

[0050] Preferably, the liquid hydrogen storage tank 1 is a spherical tank, a cylindrical tank or a storage tank with a hemispherical head; the external insulation layer 2 is a spherical tank, a cylindrical tank or a storage tank with a hemispherical head.

[0051] Preferably, the secondary normal converter 3 is filled with a hydrogen secondary normal conversion catalyst, and the secondary hydrogen gas vaporized from the liquid hydrogen storage tank 1 enters the secondary normal converter 3 to undergo a secondary normal conversion endothermic reaction, providing cooling to the lower part of the cold shield space 5 and the connecting support 7, preventing external heat from being transferred to the liquid hydrogen storage tank 1 through the connecting support 7.

[0052] Preferably, the hydrogen secondary normal conversion catalyst is a hydrated iron catalyst.

[0053] Specifically, the fluid in the cooling coil 4 is normal gaseous hydrogen converted by the secondary normal converter 3. The temperature of the normal gaseous hydrogen decreases after the endothermic reaction in the secondary normal converter 3. After a part of heat exchange is carried out at the connecting support 7, there is still excess cold energy in the cooling coil 4 to provide cold protection for the cold shield space.

[0054] Specifically, the cold shield space 5 is subjected to different vacuum treatments according to its function, and the cold energy generated by the Zhongzheng conversion is rationally utilized to minimize the loss of liquid hydrogen; the Zhongzheng conversion area uses gaseous hydrogen to continuously generate cold energy to protect the connection support 7 between the liquid hydrogen storage tank and the outer insulation layer from heat leakage, avoiding the accelerated heat loss caused by the flow of liquid hydrogen due to local heat; the cold shield heat exchange protection area has no connection heat leakage, and relies on the cooling coil 4 to utilize the excess cold energy of the Zhongzheng conversion for cold shield protection.

[0055] The working principle of this equipment: the gaseous parahydrogen located at the top of the liquid hydrogen storage tank enters the para-normal converter through the pipeline due to the increase of the pressure in the tank, and then undergoes para-normal conversion in the para-normal converter, continuously generating cold to protect the heat leakage of the connection support between the liquid hydrogen storage tank and the outer insulation layer. Then, the excess cold after the para-normal reaction enters the cooling coil to provide thermal protection for the liquid hydrogen storage tank. At the same time, the cold provided by the para-normal reaction can provide a cold shield space for the storage of liquid hydrogen to prevent the loss of liquid hydrogen gasification due to the loss of cold in the liquid hydrogen storage tank. Finally, when the gaseous hydrogen pressure in the para-normal converter and the cooling coil reaches a certain level, the excess hydrogen is discharged through the exhaust port.

[0056] Example 1

[0057] A liquid hydrogen storage device with cold shield space partition, comprising a liquid hydrogen storage tank 1, an external insulation layer 2 and a cold shield space 5, wherein the liquid hydrogen storage tank 1 is covered with the external insulation layer 2, and the space formed between the liquid hydrogen storage tank 1 and the external insulation layer 2 is the cold shield space 5; a secondary normal converter 3, a connecting support 7, a cooling coil 4 and a cold shield space partition 8 are arranged in the cold shield space 5, the secondary normal converter 3 is located at the lower part of the liquid hydrogen storage tank 1 and is connected to the cooling coil 4, and the cooling coil 4 is located above the secondary normal converter 3; a gaseous hydrogen outlet 9 is arranged at the top of the liquid hydrogen storage tank 1, and the gaseous hydrogen outlet 9 is connected to the secondary normal converter 3 through a pipeline.

[0058] In this embodiment, the material of the liquid hydrogen storage tank 1 is 304 stainless steel, and the material of the external insulation layer 2 is 16MnR.

[0059] In this embodiment, the lower part of the liquid hydrogen storage tank 1 is fixedly connected to the external insulation layer 2 through the connecting support 7; the liquid hydrogen storage tank 1 is also provided with a liquid hydrogen inlet and a liquid hydrogen outlet; the connecting support 7 is a cylinder, and the number is 3.

[0060] In this embodiment, an exhaust port 6 is provided at the end of the cooling coil 4, and the exhaust port 6 is connected to the external atmosphere.

[0061] In this embodiment, the secondary positive converter 3 is a tubular reactor, which is coiled around the outer wall of the connecting support 7.

[0062] In this embodiment, the cold shield space partition 8 is in a circular ring shape and is located between the secondary positive converter 3 and the cooling coil 4, which divides the cold shield space 5 into a lower connection support protection area and an upper cold shield heat exchange protection area.

[0063] In this embodiment, the vacuum degree of the connection support protection area is 450 Pa, and the vacuum degree of the cold shield heat exchange protection area is 150 Pa.

[0064] In this embodiment, the cooling coil 4 is wound around the outer wall of the liquid hydrogen storage tank 1 .

[0065] In this embodiment, the liquid hydrogen storage tank 1 is a storage tank with two hemispherical heads; the external insulation layer 2 is a storage tank with two hemispherical heads.

[0066] The secondary normal conversion device 3 is filled with a hydrogen secondary normal conversion catalyst, and the hydrogen secondary normal conversion catalyst is a hydrated iron catalyst.

[0067] Example 2

[0068] A liquid hydrogen storage device with cold shield space partition, comprising a liquid hydrogen storage tank 1, an external insulation layer 2 and a cold shield space 5, wherein the liquid hydrogen storage tank 1 is covered with the external insulation layer 2, and the space formed between the liquid hydrogen storage tank 1 and the external insulation layer 2 is the cold shield space 5; a secondary normal converter 3, a connecting support 7, a cooling coil 4 and a cold shield space partition 8 are arranged in the cold shield space 5, the secondary normal converter 3 is located at the lower part of the liquid hydrogen storage tank 1 and is connected to the cooling coil 4, and the cooling coil 4 is located above the secondary normal converter 3; a gaseous hydrogen outlet 9 is arranged at the top of the liquid hydrogen storage tank 1, and the gaseous hydrogen outlet 9 is connected to the secondary normal converter 3 through a pipeline.

[0069] In this embodiment, the material of the liquid hydrogen storage tank 1 is 304 stainless steel, and the material of the external insulation layer 2 is 16MnR.

[0070] In this embodiment, the lower part of the liquid hydrogen storage tank 1 is fixedly connected to the external insulation layer 2 through the connecting support 7; the liquid hydrogen storage tank 1 is also provided with a liquid hydrogen inlet and a liquid hydrogen outlet; the connecting support 7 is a cylinder, and the number is 5.

[0071] In this embodiment, an exhaust port 6 is provided at the end of the cooling coil 4, and the exhaust port 6 is connected to the external atmosphere.

[0072] In this embodiment, the secondary positive converter 3 is a tubular reactor, which is coiled around the outside of the connecting support 7 and is arranged on the inner wall of the external insulation layer 2.

[0073] In this embodiment, the cold shield space partition 8 is in a circular ring shape and is located between the secondary positive converter 3 and the cooling coil 4, which divides the cold shield space 5 into a lower connection support protection area and an upper cold shield heat exchange protection area.

[0074] In this embodiment, the cold shield space is filled with variable density multi-layer insulation material.

[0075] In this embodiment, the vacuum degree of the connection support protection area is 300 Pa, and the vacuum degree of the cold shield heat exchange protection area is 100 Pa.

[0076] In this embodiment, the cooling coil 4 is coiled around the inner wall of the external thermal insulation layer 2 .

[0077] In this embodiment, the liquid hydrogen storage tank 1 is a storage tank with two hemispherical heads; the external insulation layer 2 is a storage tank with two hemispherical heads.

[0078] The secondary normal conversion device 3 is filled with a hydrogen secondary normal conversion catalyst, and the hydrogen secondary normal conversion catalyst is a hydrated iron catalyst.

[0079] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid hydrogen storage device with cold shield space partition, characterized in that: The invention comprises a liquid hydrogen storage tank (1), an external insulation layer (2) and a cold shield space (5), wherein the liquid hydrogen storage tank (1) is covered with an external insulation layer (2), and the space formed between the liquid hydrogen storage tank (1) and the external insulation layer (2) is the cold shield space (5); a secondary normal converter (3), a connecting support (7), a cooling coil (4) and a cold shield space partition (8) are arranged in the cold shield space (5), the secondary normal converter (3) is located at the lower part of the liquid hydrogen storage tank (1) and is connected to the cooling coil (4), and the cooling coil (4) is located above the secondary normal converter (3); a gaseous hydrogen outlet (9) is arranged at the top of the liquid hydrogen storage tank (1), and the gaseous hydrogen outlet (9) is connected to the secondary normal converter (3) through a pipeline; The cold shield space partition (8) is in the shape of a ring. The cold shield space partition (8) is located between the secondary positive converter (3) and the cooling coil (4), and divides the cold shield space (5) into a lower connection support protection zone and an upper cold shield heat exchange protection zone; the vacuum degree of the connection support protection zone is not greater than 500 Pa, and the vacuum degree of the cold shield heat exchange protection zone is not greater than 200 Pa, and the vacuum degree of the cold shield heat exchange protection zone is less than the vacuum degree of the connection support protection zone.

2. According to claim 1, a liquid hydrogen storage device with cold shield space partitioning is characterized in that: The lower part of the liquid hydrogen storage tank (1) is fixedly connected to the external thermal insulation layer (2) via the connecting support (7); the liquid hydrogen storage tank (1) is also provided with a liquid hydrogen inlet and a liquid hydrogen outlet; the connecting support (7) is a cylinder, and the number of the connecting supports is 3-5.

3. The liquid hydrogen storage device with cold shield space partition according to claim 1 is characterized in that: An exhaust port (6) is provided at the end of the cooling coil (4), and the exhaust port (6) is connected to the external atmosphere.

4. According to the cold shield space partitioned liquid hydrogen storage device of claim 1, it is characterized in that: The vacuum degree in the cold shield space (5) is not greater than 500 Pa.

5. The liquid hydrogen storage device with cold shield space partition according to claim 2 is characterized in that: The secondary positive converter (3) is a tubular reactor, which is coiled on the outside of the connecting support (7).

6. The liquid hydrogen storage device with cold shield space partition according to claim 1, characterized in that: The cooling coil (4) is coiled around the outer wall of the liquid hydrogen storage tank (1).

7. The liquid hydrogen storage device with cold shield space partition according to claim 2 is characterized in that: The liquid hydrogen storage tank (1) is one of a spherical tank, a cylindrical tank or a storage tank with a hemispherical head; the external thermal insulation layer (2) is one of a spherical tank, a cylindrical tank or a storage tank with a hemispherical head.

8. The liquid hydrogen storage device with cold shield space partition according to claim 5, characterized in that: The secondary normal conversion device (3) is filled with a hydrogen secondary normal conversion catalyst.

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