Double-layer vacuum spherical tank insulation system

Abstract

The application is suitable for the field of high-efficiency adiabatic storage of liquid hydrogen, and provides a double-layer vacuum spherical tank adiabatic system, which comprises a liquid hydrogen spherical tank inner container containing liquid hydrogen, a liquid hydrogen spherical tank outer container sleeved outside the liquid hydrogen spherical tank inner container, a high-vacuum multi-layer adiabatic layer arranged between the liquid hydrogen spherical tank inner container and the liquid hydrogen spherical tank outer container, a plurality of leg assemblies arranged uniformly at the bottom of the liquid hydrogen spherical tank outer container, wherein the leg assemblies are divided into outer legs and inner legs for supporting the liquid hydrogen spherical tank outer container and the liquid hydrogen spherical tank inner container respectively, the inner legs are arranged through the gaps in the multi-layer adiabatic material, the adiabatic storage tanks in the plurality of leg assemblies are connected through pipelines, and the adiabatic storage tanks store cold storage medium, and a cold taking component is arranged for indirectly exchanging heat between the liquid hydrogen supplied by the liquid hydrogen storage tank inner container and the cold storage medium stored in the adiabatic storage tanks, so as to realize the double effects of liquid hydrogen cold energy recycling and adiabatic performance improvement of the spherical tank.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of efficient adiabatic storage of liquid hydrogen, and in particular to a double-layer vacuum spherical tank adiabatic system. BACKGROUND

[0002] Hydrogen energy is water, and water is generated. No pollutants are generated in the process, so it is hailed as the "ultimate energy" by people. How to safely and efficiently store hydrogen energy is one of the focuses of energy industry research. The current common hydrogen storage method is physical hydrogen storage, which has the advantage of flexible use. Physical hydrogen storage is mainly divided into two categories: (1) high-pressure gaseous hydrogen storage; (2) low-temperature liquid hydrogen storage; low-temperature liquid hydrogen storage is widely concerned in the industry due to its high storage efficiency and good safety. Compared with the ambient temperature, the temperature of liquid hydrogen is relatively low, and the large temperature difference forces the liquid hydrogen inside the double-layer liquid hydrogen spherical tank to evaporate rapidly. There are mainly three ways for liquid hydrogen evaporation: (1) heat bridge solid heat conduction; (2) high-vacuum multilayer adiabatic interlayer heat leakage of radiation, solid and residual gas; (3) heat conduction heat leakage of the support legs supporting the inner container. For the heat leakage of the high-vacuum multilayer adiabatic interlayer, researchers propose to set up a gas-cooled screen inside the multilayer adiabatic material in the vacuum multilayer adiabatic interlayer, which can further reduce the heat leakage through the high-vacuum multilayer adiabatic interlayer. For heat bridge heat leakage, the length of the heat bridge pipeline is usually increased in engineering to increase the thermal resistance of the heat bridge or use a material with lower thermal conductivity; for leg heat leakage, the middle of the leg is usually cut off in engineering, and glass steel with lower thermal conductivity is added to block the transmission of ground heat to the liquid hydrogen spherical tank inner container. However, due to the large temperature difference between liquid hydrogen and the ground, this passive heat blocking method will still have some heat transferred into the liquid hydrogen, forcing the liquid hydrogen to evaporate and reducing the adiabatic performance of the liquid hydrogen storage tank. And based on the previous theoretical analysis, the applicant found that the support structure heat leakage accounts for about one-third of the total heat leakage. Therefore, how to reduce the heat leakage of the support structure of the liquid hydrogen storage tank is one of the key technologies to improve the adiabatic performance of the storage tank. Based on this, the present application provides a double-layer vacuum spherical tank adiabatic system. SUMMARY

[0003] The purpose of the present application is to provide a double-layer vacuum spherical tank adiabatic system, which fully utilizes the waste cold energy generated during the use of liquid hydrogen for liquid hydrogen spherical tank leg heat insulation and high-pressure hydrogen gas filling cooling, etc., not only reducing the energy consumption of the entire liquid hydrogen filling station, but also improving the adiabatic performance of the liquid hydrogen storage tank, to solve the problems raised in the background art.

[0004] To achieve the above purpose, the present application provides the following technical scheme:

[0005] A double-layer vacuum spherical tank adiabatic system, comprising:

[0006] a liquid hydrogen spherical tank inner container containing liquid hydrogen inside;

[0007] A liquid hydrogen spherical tank outer container is sleeved outside the liquid hydrogen spherical tank inner container;

[0008] A high vacuum multilayer insulation layer is arranged between the liquid hydrogen spherical tank inner container and the liquid hydrogen spherical tank outer container;

[0009] A plurality of leg assemblies are arranged uniformly at the bottom of the liquid hydrogen spherical tank composed of the liquid hydrogen spherical tank inner container, the liquid hydrogen spherical tank outer container and the high vacuum multilayer insulation layer, and the leg assemblies are divided into outer legs and inner legs for supporting the liquid hydrogen spherical tank outer container and the liquid hydrogen spherical tank inner container respectively; the inner legs are arranged through the gap on the liquid hydrogen spherical tank outer container;

[0010] The inner leg comprises an upper inner leg and a lower inner leg, the first end of the upper inner leg is connected to the liquid hydrogen storage tank inner container, the second end of the upper inner leg is connected to an insulation storage tank, the bottom of the insulation storage tank is sealed at the gap on the liquid hydrogen spherical tank outer container, and the lower inner leg is arranged below the insulation storage tank; the insulation storage tanks in the plurality of leg assemblies are connected through pipelines, and the plurality of insulation storage tanks store the cold storage medium;

[0011] The cold taking component is used for indirectly exchanging heat between the liquid hydrogen supplied by the liquid hydrogen storage tank inner container and the cold storage medium stored in the insulation storage tank, realizing the dual effects of liquid hydrogen cold energy recycling and improvement of the insulation performance of the spherical tank.

[0012] As a further scheme of the application, the upper part of the insulation storage tank is connected to the bottom of the upper inner leg through an insulation structure.

[0013] As a further scheme of the application, the bottom of the insulation storage tank is provided with a second upper flange, the second upper flange is sealed at the gap, and the second upper flange is connected to the lower inner leg through a second lower flange.

[0014] As a further scheme of the application, the cold taking component comprises a cold taking working medium storage tank and a cold storage working medium storage tank; the output end of the liquid hydrogen storage tank inner container is connected to the input end of a first heat exchanger inside the cold taking working medium storage tank, the cold taking working medium is filled inside the cold taking working medium storage tank, the cold taking working medium inside the cold taking working medium storage tank flows into a second heat exchanger inside the cold storage working medium storage tank through a pipeline circulation, the cold storage working medium storage tank is connected to the insulation storage tank through a pipeline, and the cold storage medium inside the insulation storage tank circulates between the cold storage working medium storage tank and the insulation storage tank.

[0015] As a further scheme of the application, the liquid hydrogen storage tank inner container is connected to the input end of the first heat exchanger through a ninth valve, a first pump group and a tenth valve in sequence, for providing liquid hydrogen for the first heat exchanger.

[0016] As a further scheme of the present application: the output end of the cold working medium storage tank is connected with the input end of the second heat exchanger through the fifth valve and the third pump group, and the output end of the second heat exchanger is connected with the input end of the cold working medium storage tank through the fourth valve, so that the cold working medium in the cold working medium storage tank can circulate and exchange heat between the cold working medium storage tank and the second heat exchanger.

[0017] Optionally, the cold working medium can be freon 22, freon 12 and R410a, etc.

[0018] As a further scheme of the present application: further comprising a high-pressure hydrogen storage pipe bundle, and the input end of the high-pressure hydrogen storage pipe bundle is connected with the output end of the first heat exchanger through the third valve, so as to provide hydrogen for the high-pressure hydrogen storage pipe bundle.

[0019] As a further scheme of the present application: the output end of the high-pressure hydrogen storage pipe bundle is connected with the input end of the third heat exchanger in the cold storage medium storage tank through the second valve, and the output end of the third heat exchanger is connected with the input end of the hydrogenation gun through the first valve, so as to cool the normal-temperature high-pressure hydrogen gas output by the high-pressure hydrogen storage pipe bundle in the decompression process to become high-temperature hydrogen gas, and the high-temperature hydrogen gas absorbs the cold energy of the cold storage medium and is delivered to the hydrogenation gun after cooling.

[0020] Optionally, the cold storage medium can be R1234yf, R32 and R410a, etc.

[0021] As a further scheme of the present application: the output end of the cold storage medium storage tank is connected with the cold storage medium inlet distribution pipeline on the adiabatic storage tank through the sixth valve and the second pump group, and the cold storage medium outlet pipeline on the adiabatic storage tank is connected with the input end of the cold storage medium storage tank through the seventh valve.

[0022] As a further scheme of the present application: the high-vacuum multilayer insulation layer comprises a plurality of layers of insulation materials and a vacuum interlayer, and the high-vacuum multilayer insulation layer is arranged between the outer container and the inner container of the liquid hydrogen storage tank, and the insulation materials are provided with an air-cooled screen.

[0023] Compared with the prior art, the present application has the following advantages: by arranging the adiabatic storage tank on the inner leg, the environmental ground heat is reduced from the inner leg to the support heat leakage of the liquid hydrogen; at the same time, the cold energy released during the use of the liquid hydrogen is recycled and reused to cool the cold storage medium in the adiabatic storage tank, so as to realize the dual effects of liquid hydrogen cold energy recycling and improvement of the adiabatic performance of the spherical tank. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a double-layer vacuum spherical tank adiabatic system according to an embodiment of the present application.

[0025] Figure 2A structure schematic diagram of a liquid hydrogen storage tank in a double-layer vacuum spherical tank heat insulation system according to an embodiment of the present application.

[0026] In the figure: 1-hydrogen fuel vehicle, 2-hydrogen filling gun, 3-first valve, 4-second valve, 5-high pressure hydrogen storage tube bundle, 6-third valve, 7-cold storage medium, 8-third heat exchanger, 9-second heat exchanger, 10-cold storage working medium storage tank, 11-fourth valve, 12-first heat exchanger, 13-cold working medium, 14-cold working medium storage tank, 15-fifth valve, 16-third pump group, 17-sixth valve, 18-seventh valve, 19-second pump group, 20-cold storage working medium inlet distribution pipeline, 21-cold storage working medium outlet pipeline, 22-first upper flange, 23-first lower flange, 24-heat insulation structure, 25-heat insulation storage tank, 26-second upper flange, 27-second lower flange, 28-liquid hydrogen, 29-ninth valve, 30-first pump group, 31-inner leg, 32-outer leg, 33-lifting lug, 34-tenth valve, 35-liquid hydrogen storage tank inner container, 36-multilayer heat insulation material, 37-vacuum interlayer, 38-liquid hydrogen storage tank outer container. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0028] Embodiment 1

[0029] Please refer to Figures 1-2In the embodiment 1 of the present application, a structure diagram of a double-layer vacuum spherical tank heat insulation system provided by the embodiment of the present application comprises: a liquid hydrogen spherical tank inner container 35, a liquid hydrogen spherical tank outer container 38, a high-vacuum multi-layer heat insulation layer 37, a plurality of leg assemblies and a cold taking component. The liquid hydrogen 28 is contained in the liquid hydrogen spherical tank inner container 35; the liquid hydrogen spherical tank outer container 38 is sleeved outside the liquid hydrogen spherical tank inner container; the high-vacuum multi-layer heat insulation layer 37 is arranged between the liquid hydrogen spherical tank inner container 35 and the liquid hydrogen spherical tank outer container 38; the leg assemblies are uniformly arranged at the bottom of the liquid hydrogen spherical tank composed of the liquid hydrogen spherical tank inner container 35, the liquid hydrogen spherical tank outer container 38 and the high-vacuum multi-layer heat insulation layer 37, and the leg assemblies are divided into outer legs 32 and inner legs 31, the outer legs 32 and the inner legs 31 are respectively used for supporting the liquid hydrogen spherical tank outer container 38 and the liquid hydrogen spherical tank inner container 35; the inner legs 31 pass through the gap on the liquid hydrogen spherical tank outer container 38; wherein the inner legs 31 comprise upper inner legs and lower inner legs, the first end of the upper inner leg is connected to the bottom of the liquid hydrogen storage tank inner container 35, the second end of the upper leg is connected with the heat insulation storage tank 25, the bottom of the heat insulation storage tank 25 is sealed at the gap on the liquid hydrogen spherical tank outer container 38, and the lower inner leg is installed below the heat insulation storage tank 25; the heat insulation storage tanks 25 in the plurality of leg assemblies are communicated through pipelines, and the plurality of heat insulation storage tanks 25 store the cold storage medium 7. By installing the heat insulation storage tank 25 at the gap of the liquid hydrogen spherical tank outer container 38, the ground heat from the inner leg is reduced to support the heat leakage of the liquid hydrogen. The lower inner leg is fixedly arranged inside the outer leg 32. The cold taking component is used for indirectly exchanging heat between the liquid hydrogen supplied by the liquid hydrogen storage tank inner container 35 and the cold storage medium 7 stored in the heat insulation storage tank 25, so as to realize the recycling of cold energy. The plurality of leg assemblies can be eight. The cold taking component can be set to one-time cold taking utilization or step-by-step cold taking utilization.

[0030] The present application reduces the ground heat from the inner leg to the inside of the liquid hydrogen by arranging the heat insulation storage tank 25 on the inner leg 31; at the same time, the cold energy released by the liquid hydrogen output by the inner container 35 is used for indirectly exchanging heat with the cold storage medium 7 in the heat insulation storage tank 25, so as to realize the recycling of cold energy.

[0031] As shown in Figure 1 As a preferred embodiment of the present application, the upper part of the heat insulation storage tank 25 is connected to the upper inner leg through the heat insulation structure 24, so as to further realize heat insulation. The heat insulation structure 24 is connected to the second end of the upper leg through the first lower flange 23 and the first upper flange 22. The heat insulation structure 24 can be a glass steel heat insulation structure.

[0032] As a preferred embodiment of the present application, the bottom of the heat-insulated tank 25 is provided with a second upper flange 26, which is sealed at the notch of the outer leg 32, and the second upper flange 26 is connected to the lower leg through a second lower flange 27. The second lower flange 27 and the lower inner leg can be connected by welding.

[0033] As a preferred embodiment of the present application, the cold-heat-exchange component comprises a cold-heat-exchange medium tank 14 and a cold-heat-exchange medium 13; the output end of the liquid hydrogen storage inner container 35 is connected to the input end of the first heat exchanger 12 inside the cold-heat-exchange medium tank 14, the cold-heat-exchange medium tank 14 is filled with the cold-heat-exchange medium 13, the cold-heat-exchange medium 13 inside the cold-heat-exchange medium tank 14 flows into the second heat exchanger 9 inside the cold-heat-exchange medium tank 10 through a pipeline, the cold-heat-exchange medium tank 10 is connected to the heat-insulated tank 25 through a pipeline, and the cold-heat-exchange medium 7 inside the heat-insulated tank 25 circulates between the cold-heat-exchange medium tank 10 and the heat-insulated tank 25. In this way, the liquid hydrogen supplied from outside is exchanged with the cold-heat-exchange medium 13 in the first heat exchanger 12 inside the cold-heat-exchange medium tank 14, and then the cold-heat-exchange medium 13 exchanges cold energy with the cold-heat-exchange medium 7 in the cold-heat-exchange medium tank 10 in the second heat exchanger 9. In this way, the cold energy of the liquid hydrogen is recycled and reused.

[0034] Optionally, the cold-heat-exchange medium 13 can be freon 22, freon 12, R410a, etc.

[0035] Specifically, the liquid hydrogen storage inner container 35 is connected to the input end of the first heat exchanger 12 in sequence through a ninth valve 29, a first pump group 30 and a tenth valve 34, for providing liquid hydrogen for the first heat exchanger 12. The first pump group 30 is used to provide power for the flow of liquid hydrogen.

[0036] The output end of the cold-heat-exchange medium tank 14 is connected to the input end of the second heat exchanger 9 through a fifth valve 15 and a third pump group 16, and the output end of the second heat exchanger 9 is connected to the input end of the cold-heat-exchange medium tank 14 through a fourth valve 11, so that the cold-heat-exchange medium 13 inside the cold-heat-exchange medium tank 14 can circulate and exchange heat between the cold-heat-exchange medium tank 14 and the second heat exchanger 9.

[0037] The present application further comprises a high-pressure hydrogen storage pipe bundle 5, the input end of which is connected to the output end of the first heat exchanger 12 through a third valve 6, for providing high-pressure hydrogen gas for the high-pressure hydrogen storage pipe bundle 5, and the high-pressure hydrogen storage pipe bundle 5 stores the high-pressure hydrogen gas.

[0038] As a preferred embodiment of the present application, the output end of the high-pressure hydrogen storage tube bundle 5 is connected with the input end of the third heat exchanger 8 inside the cold storage medium storage tank 10 through the second valve 4; the output end of the third heat exchanger 8 is connected with the input end of the hydrogen filling gun 2 through the first valve 3, which is used for cooling the high-temperature hydrogen gas generated in the decompression process of the normal-temperature high-pressure hydrogen gas output by the high-pressure hydrogen storage tube bundle 5, the high-temperature hydrogen gas absorbs the cold energy of the cold storage medium 7, and the cooled hydrogen gas is delivered to the hydrogen filling gun 2, the hydrogen filling gun 2 provides hydrogen gas for the hydrogen fuel vehicle 1, and the third heat exchanger 8 exchanges heat with the cold storage medium 7 inside the cold storage medium storage tank 10. Thus, the cold energy of the liquid hydrogen is further utilized. The hydrogen filling gun 2 provides fuel for the hydrogen fuel vehicle 1.

[0039] Optionally, the cold storage medium 7 can be R1234yf, R32 and R410a, etc.

[0040] As a preferred embodiment of the present application, the output end of the cold storage medium storage tank 10 is connected with the cold storage medium inlet distribution pipeline 20 on the adiabatic storage tank 25 through the sixth valve 17 and the second pump group 19, and the cold storage medium outlet pipeline 21 on the adiabatic storage tank 25 is connected with the input end of the cold storage medium storage tank 10 through the seventh valve 18. Thus, the second pump group 19 provides circulating power for the flow of the cold storage medium 7, and realizes the circulating flow of the cold storage medium 7 between the adiabatic storage tank 25 and the cold storage medium storage tank 10.

[0041] As a preferred embodiment of the present application, a plurality of adiabatic storage tanks 25 are connected in series through pipelines. The outrigger assembly further comprises lifting lugs 33, which facilitate the installation of the liquid hydrogen spherical tank.

[0042] As a preferred embodiment of the present application, the high-vacuum multi-layer insulation layer comprises a plurality of layers of insulation material 36 and a vacuum interlayer 37, the vacuum interlayer 37 is located between the liquid hydrogen storage tank outer container 38 and the liquid hydrogen storage tank inner container 35, and the insulation material can be provided with a gas-cooled screen. The heat leakage through the high-vacuum multi-layer insulation interlayer can be reduced. The valve in the present application can be a low-temperature stop valve.

[0043] As another preferred embodiment of the present application, when the cold taking component can be set to take cold once, the cold taking component comprises a cold storage medium storage tank 10, the output end of the cold storage medium storage tank 14 is connected with the input end of the second heat exchanger 9 inside the cold storage medium storage tank 10, the cold storage medium storage tank 10 is communicated with the adiabatic storage tank 25 through a pipeline, and the cold storage medium 7 inside the adiabatic storage tank 25 circulates between the cold storage medium storage tank 10 and the adiabatic storage tank 25. Thus, the liquid hydrogen supplied from outside is exchanged with the cold storage medium 13 in the cold storage medium storage tank 14 through the first heat exchanger 12 in the cold storage medium storage tank 14. Thus, the cold energy of the liquid hydrogen is recycled and reused.

[0044] Optionally, the cold working medium storage tank 14 and the cold storage medium storage tank 10 are both heat preservation storage tanks.

[0045] The present application relates to heat bridge heat leakage, and generally adopts lengthening of a heat bridge pipeline to increase thermal resistance of the heat bridge or adopts a material with low thermal conductivity; for leg assembly heat leakage, generally, the middle of the leg is partitioned, and glass fiber reinforced plastic with low thermal conductivity is added to weaken the ground heat transmission to the inner container of the liquid hydrogen tank. However, due to the large temperature difference between the liquid hydrogen and the ground, the passive heat resistance mode still has part of the heat transmitted into the liquid hydrogen, forcing the liquid hydrogen to evaporate, and reducing the heat insulation performance of the liquid hydrogen storage tank.

[0046] The working principle of the present application is as follows:

[0047] In the present application, the liquid hydrogen 28 flows through the pipeline k and the ninth valve 29 to enter the first pump set 30, is pressurized, and then flows through the tenth valve 34 from the outlet pipeline l of the first pump set 30 to enter the first heat exchanger 12. The first heat exchanger 12 is arranged in the interior of the cold working medium storage tank 14; the cold working medium 13 is accommodated in the interior of the cold working medium storage tank 14, and the cold working medium 13 enters the third pump set 16 through the outlet pipeline f of the cold working medium storage tank 14 and the fifth valve 15, is pressurized by the third pump set 16, and then enters the second heat exchanger 9 from the outlet pipeline g of the third pump set 16. The third heat exchanger 8 is arranged in the interior of the cold storage medium storage tank 10, the cold storage medium 7 is stored in the interior of the cold storage medium storage tank 10, and the cold working medium 13 exchanges cold energy with the cold storage medium 7 after flowing through the second heat exchanger 9, and then returns to the cold working medium storage tank 14 through the outlet pipeline e of the second heat exchanger 9 and the fourth valve 11, thereby realizing recycling of the liquid hydrogen cold energy. The cold storage medium 7 absorbs the cold energy released from the second heat exchanger 9, flows through the outlet pipeline h of the cold storage medium storage tank 10 and the sixth valve 17 to enter the second pump set 19, is pressurized by the second pump set 19, flows through the outlet pipeline i of the second pump set 19 to enter the cold storage medium inlet distribution pipeline 20, enters the interior of the adiabatic storage tank 25 through the inlet distribution pipeline 20, and is used for absorbing heat by the inner leg 31. The cold storage medium 7 absorbs heat from the ground introduced into the inner leg in the interior of the adiabatic storage tank 25. After absorbing heat, the cold storage medium 7 flows through the pipeline j and the seventh valve 18 through the outlet pipeline 21 of the cold storage medium storage tank to return to the cold storage medium storage tank 10. In turn, it circulates to absorb heat transmitted by the inner leg 31 of the liquid hydrogen storage tank. The adiabatic storage tank 25 further absorbs part of the heat introduced into the liquid hydrogen 28 through the inner leg, and the adiabatic storage tank 25 is fixed by the first upper flange 22, the first lower flange 23 and the adiabatic structure 24. The lower part of the inner leg is sealed with the second upper flange 26 and the second lower flange 27 and the outer leg 32, so as to make it easier to vacuumize the vacuum interlayer 37.

[0048] Liquid hydrogen flows out through the outlet pipeline d of the first heat exchanger 12, enters the high-pressure hydrogen storage bundle 5 through the third valve 6, and is stored at high pressure. The high-pressure hydrogen gas flows out from the outlet end pipeline c of the high-pressure hydrogen storage bundle 5, exchanges heat through the third heat exchanger 8, and then flows out from the outlet pipeline b, flows through the first valve 3 into the hydrogen filling gun 2, and finally, through the pipeline a, supplies hydrogen to the hydrogen fuel vehicle 1. During high-pressure hydrogen filling, an additional pre-cooling device is reduced, and the operation and maintenance cost of liquid hydrogen is reduced.

[0049] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0050] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. 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.

[0051] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0052] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A double-walled vacuum sphere insulation system, characterized in that, The application relates to a liquid hydrogen spherical tank, which comprises the following components: a liquid hydrogen spherical tank inner container containing liquid hydrogen; a liquid hydrogen spherical tank outer container sleeved outside the liquid hydrogen spherical tank inner container; a high-vacuum multilayer insulation layer arranged between the liquid hydrogen spherical tank inner container and the liquid hydrogen spherical tank outer container; a plurality of leg assemblies arranged uniformly at the bottom of the liquid hydrogen spherical tank composed of the liquid hydrogen spherical tank inner container, the liquid hydrogen spherical tank outer container and the high-vacuum multilayer insulation layer, wherein the leg assemblies are divided into outer legs and inner legs for supporting the liquid hydrogen spherical tank outer container and the liquid hydrogen spherical tank inner container respectively, and the inner legs are arranged through the gap on the liquid hydrogen spherical tank outer container; wherein the inner legs comprise upper legs and lower legs, the first end of the upper leg is connected to the liquid hydrogen spherical tank inner container, the second end of the upper leg is connected to an insulation storage tank, the bottom of the insulation storage tank is sealed to the gap on the liquid hydrogen spherical tank outer container, and the lower leg is arranged below the insulation storage tank; the insulation storage tanks in the plurality of inner legs are connected through pipelines, and the plurality of insulation storage tanks store cold storage medium; a cold taking component is arranged for indirectly exchanging heat between the liquid hydrogen supplied by the liquid hydrogen spherical tank inner container and the cold storage medium stored in the insulation storage tank, so as to realize the double effects of recycling and reusing the cold energy of the liquid hydrogen and improving the insulation performance of the spherical tank. The upper part of the insulation storage tank is connected to the bottom of the upper inner leg through an insulation structure. The bottom of the insulation storage tank is provided with a second upper flange, the second upper flange is sealed in the outer leg, and the second upper flange is connected to the lower inner leg through a second lower flange. The cold taking component comprises a cold taking working medium storage tank and a cold storage working medium storage tank; the output end of the liquid hydrogen spherical tank inner container is connected to the input end of a first heat exchanger arranged inside the cold taking working medium storage tank, the cold taking working medium storage tank is filled with cold taking working medium, the cold taking working medium in the cold taking working medium storage tank is circulated into a second heat exchanger arranged inside the cold storage working medium storage tank through a pipeline, the cold storage working medium storage tank is connected to the insulation storage tank through a pipeline, and the cold storage medium in the insulation storage tank is circulated between the cold storage working medium storage tank and the insulation storage tank. The liquid hydrogen spherical tank inner container is sequentially connected to the input end of the first heat exchanger through a ninth valve, a first pump group and a tenth valve, so as to provide liquid hydrogen for the first heat exchanger. The output end of the cold taking working medium storage tank is connected to the input end of a second heat exchanger through a fifth valve and a third pump group, and the output end of the second heat exchanger is connected to the input end of the cold taking working medium storage tank through a fourth valve, so that the cold taking working medium in the cold taking working medium storage tank can be circulated and exchanged between the cold taking working medium storage tank and the second heat exchanger. A high-pressure hydrogen storage pipe bundle is further arranged, the input end of the high-pressure hydrogen storage pipe bundle is connected to the output end of the first heat exchanger through a third valve, so as to provide hydrogen for the high-pressure hydrogen storage pipe bundle.

2. The double-layer vacuum spherical tank insulation system according to claim 1, characterized in that, The output end of the high-pressure hydrogen storage pipe bundle is connected to the input end of a third heat exchanger arranged inside the cold storage working medium storage tank through a second valve; the output end of the third heat exchanger is connected to the input end of a hydrogen adding gun through a first valve, so as to cool the high-temperature hydrogen generated by heating the normal-temperature high-pressure hydrogen output by the high-pressure hydrogen storage pipe bundle in the decompression process, the high-temperature hydrogen absorbs the cold energy of the cold storage medium, and the hydrogen is delivered to the hydrogen adding gun after being cooled.

3. The double-layer vacuum spherical tank insulation system according to claim 2, wherein, ​ 4. The double-layer vacuum spherical tank insulation system according to claim 1, wherein, ​ 5. A double-layer vacuum spherical tank insulation system according to claim 4, characterized in that, ​ 6. A double-layer vacuum spherical tank insulation system according to claim 5, characterized in that, ​ 7. A double-layer vacuum spherical tank insulation system according to claim 6, characterized in that, ​ 8. A double-layer vacuum spherical tank insulation system according to claim 7, characterized in that, ​ 9. A double-layer vacuum spherical tank insulation system according to claim 8, characterized in that, The output end of the cold storage working medium storage tank is connected with the cold storage medium inlet distribution pipeline on the heat-insulated storage tank through the sixth valve and the second pump group, and the cold storage medium outlet pipeline on the heat-insulated storage tank is connected with the input end of the cold storage working medium storage tank through the seventh valve.

10. A double-layer vacuum spherical tank insulation system according to any one of claims 1-9, characterized in that, The high-vacuum multilayer heat-insulating layer comprises multilayer heat-insulating materials and a vacuum interlayer, the vacuum interlayer is arranged between the inner container and the outer container of the liquid hydrogen spherical tank, and the heat-insulating materials are provided with air cooling screens.

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