Vacuum multilayer adiabatic liquid hydrogen container and method of use

Abstract

The application discloses a vacuum multilayer heat-insulating liquid hydrogen container and a use method thereof. The vacuum multilayer heat-insulating liquid hydrogen container comprises a liquid hydrogen storage tank outer tank and a liquid hydrogen storage tank inner tank located in the liquid hydrogen storage tank outer tank. A nitrogen heat-insulating structure, a methane gas heat-insulating structure, a carbon dioxide heat-insulating structure and a radiation heat-insulating structure are sequentially arranged from inside to outside between the liquid hydrogen storage tank outer tank and the liquid hydrogen storage tank inner tank. The application utilizes the evaporation gas cooling capacity of liquid hydrogen and the multilayer heat-insulating layer filled with different freezing point temperature gases to comprehensively realize the efficient heat insulation of the liquid hydrogen storage tank and the step-by-step utilization of the evaporation gas cooling capacity. At the same time, the different heat-insulating layers are mutually isolated to avoid the problem that the vacuum degree of the traditional liquid hydrogen storage tank is easily damaged. The functions of the nitrogen heat-insulating layer, the methane gas heat-insulating layer, the carbon dioxide heat-insulating layer and the radiation heat-insulating layer can be regulated through corresponding valves. Therefore, the liquid hydrogen storage tank has heat-insulating regulation capacity, can effectively meet the application scenarios with different evaporation rate requirements, and can realize the emergency discharge of the hydrogen medium in the liquid hydrogen storage tank in certain specific scenarios.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid hydrogen, in particular to a vacuum multi-layer insulated liquid hydrogen container and a use method thereof. BACKGROUND

[0002] The low-temperature liquid hydrogen storage and supply mode has the advantages of high hydrogen storage ratio (high hydrogen carrying density), low transportation cost, high vaporization purity, low storage and transportation pressure, and high safety in use, can effectively control the comprehensive cost, and the transportation process does not involve complex unsafe factors. In addition, the advantages of liquid hydrogen in preparation, storage and transportation are more suitable for the large-scale and commercial supply of hydrogen energy. At the same time, with the rapid development of hydrogen energy terminal application industry, it will also push back the growth of liquid hydrogen demand. The liquid hydrogen technology route will become one of the important technical ways for domestic civil hydrogen energy development and application. One of the core problems of liquid hydrogen use is vaporization loss. Because the boiling point of hydrogen is very low, liquid hydrogen must be stored in a super-insulated storage tank.

[0003] However, even if the storage tank has good insulation performance, liquid hydrogen will always evaporate to some extent during storage and transportation. The evaporation of liquid hydrogen will have two losses, one is the loss of cold energy, that is, the electric energy consumed in the hydrogen liquefaction process, and the other is the loss of hydrogen fuel. The vaporized hydrogen gas will cause the internal pressure of the storage tank to rise and must be discharged in time. A typical liquid hydrogen storage tank adopts a double-shell structure with a vacuum interlayer in the middle, and a multi-layer radiation shielding screen is also provided. The vacuum degree of the vacuum insulation layer of a small storage tank is relatively higher (less than 10^-2 Pa), while the vacuum degree of the vacuum insulation layer of a large storage tank is lower (1 Pa), and there is a certain structural support between the double shells.

[0004] However, the conventional multi-layer insulated liquid hydrogen storage tank has problems such as easy damage to the vacuum degree, precise design of the distribution of the multi-layer insulation filler and the radiation shielding screen, and is difficult to adapt to more liquid hydrogen medium application scenarios in the future. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art, and a vacuum multi-layer insulated liquid hydrogen container and a use method thereof are provided. The liquid hydrogen cold energy and the gas with different freezing points are used to realize efficient insulation and accurate control of insulation capacity, and the closed porous insulation connection structure and the specific distribution of the multi-layer radiation shielding screen are designed to further improve the insulation capacity of the liquid hydrogen storage tank.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] The application discloses a vacuum multilayer adiabatic liquid hydrogen container, which comprises a liquid hydrogen storage tank outer tank and a liquid hydrogen storage tank inner tank located in the liquid hydrogen storage tank outer tank, nitrogen adiabatic structures, methane gas adiabatic structures, carbon dioxide adiabatic structures and radiation adiabatic structures are sequentially arranged from inside to outside between the liquid hydrogen storage tank outer tank and the liquid hydrogen storage tank inner tank, the above structures surround the space between the liquid hydrogen storage tank outer tank and the liquid hydrogen storage tank inner tank layer by layer, the liquid hydrogen storage tank inner tank is respectively connected with a liquid hydrogen filling pipeline, a hydrogen supply pipeline and a hydrogen utilization pipeline, the liquid hydrogen filling pipeline, the hydrogen supply pipeline and the hydrogen utilization pipeline all penetrate through the liquid hydrogen storage tank outer tank and are correspondingly provided with a liquid hydrogen filling valve, a hydrogen supply valve and a fourth hydrogen valve.

[0008] Preferably, the nitrogen adiabatic structure comprises a nitrogen adiabatic layer, and the upper and lower ends of the nitrogen adiabatic layer are provided with closed porous adiabatic connecting structures.

[0009] Preferably, the methane gas adiabatic structure comprises a methane gas adiabatic layer and a first hydrogen valve installed on the hydrogen utilization pipeline, a methane cooling branch is embedded in the methane gas adiabatic layer, the methane cooling branch is connected in parallel with the first hydrogen valve, a section of the methane cooling branch located outside the methane gas adiabatic layer is provided with a methane cooling valve, and a section of the methane cooling branch located inside the methane gas adiabatic layer is provided with a methane filling valve.

[0010] Preferably, the carbon dioxide adiabatic structure comprises a carbon dioxide adiabatic layer and a second hydrogen valve installed on the hydrogen utilization pipeline, a carbon dioxide cooling branch is arranged in the carbon dioxide adiabatic layer, the carbon dioxide cooling branch is connected in parallel with the second hydrogen valve, and the carbon dioxide cooling branch is correspondingly provided with a carbon dioxide filling valve and a carbon dioxide cooling valve at the inner and outer sections of the carbon dioxide adiabatic layer.

[0011] Preferably, the radiation adiabatic structure comprises a radiation adiabatic layer and a third hydrogen valve installed on the hydrogen utilization pipeline, a radiation cooling branch is arranged in the radiation adiabatic layer, the radiation cooling branch is connected in parallel with the third hydrogen valve, and a para-hydrogen converter and a radiation cooling valve are correspondingly arranged at the inner and outer sections of the radiation adiabatic layer.

[0012] Preferably, the radiation adiabatic layer is internally provided with a plurality of radiation-proof screens.

[0013] Compared with the prior art, the application has the beneficial effects that: the application utilizes the liquid hydrogen evaporation gas cooling capacity and the multilayer adiabatic layer filled with gases with different freezing points to comprehensively realize the efficient adiabatic of the liquid hydrogen storage tank and the step-by-step utilization of the evaporation gas cooling capacity, meanwhile, the different adiabatic layers are mutually isolated to avoid the problem that the vacuum degree of the traditional liquid hydrogen storage tank is easily damaged.

[0014] The para-hydrogen converter is arranged in the outermost radiant heat insulation layer, at this time the temperature of the evaporated hydrogen has been greatly increased, and the content of the para-hydrogen which can be converted is also increased synchronously, so that the para-hydrogen conversion cold energy is maximized. The functions of the nitrogen heat insulation layer, the methane gas heat insulation layer, the carbon dioxide heat insulation layer and the radiant heat insulation layer can be regulated by corresponding valves, so that the liquid hydrogen storage tank has heat insulation regulation capability, can effectively meet the application scenarios with different evaporation rate requirements, and can realize the emergency discharge of the hydrogen medium in the liquid hydrogen storage tank in some specific scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more specifically and intuitively illustrate the technical solutions in the embodiments of the present application or the prior art, a brief introduction will be given below to the drawings needed to be used in the embodiments or the prior art description.

[0016] Figure 1 A structure diagram of a vacuum multi-layer heat-insulated liquid hydrogen container is provided for the present application.

[0017] In the figure: liquid hydrogen storage tank outer tank 1, liquid hydrogen storage tank inner tank 2, liquid hydrogen filling pipeline 3, liquid hydrogen filling valve 4, hydrogen supply pipeline 5, hydrogen supply valve 6, nitrogen heat insulation layer 7, methane gas heat insulation layer 8, carbon dioxide heat insulation layer 9, radiant heat insulation layer 10, hydrogen utilization pipeline 11, first hydrogen valve 12, second hydrogen valve 13, third hydrogen valve 14, fourth hydrogen valve 15, closed porous heat insulation connection structure 16, methane cooling branch 17, methane cooling valve 18, methane filling valve 19, carbon dioxide cooling branch 20, carbon dioxide cooling valve 21, carbon dioxide filling valve 22, radiant cooling branch 23, radiant cooling valve 24, para-hydrogen converter 25, multi-layer radiation shielding screen 26. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0019] REFERENCE Figure 1 A vacuum multi-layer heat-insulated liquid hydrogen container includes a liquid hydrogen storage tank outer tank 1 and a liquid hydrogen storage tank inner tank 2 located therein. Between the liquid hydrogen storage tank outer tank 1 and the liquid hydrogen storage tank inner tank 2, there are sequentially arranged from inside to outside a nitrogen heat insulation structure, a methane gas heat insulation structure, a carbon dioxide heat insulation structure and a radiant heat insulation structure. The above structures surround and fill the space between the liquid hydrogen storage tank outer tank 1 and the liquid hydrogen storage tank inner tank 2. The liquid hydrogen storage tank inner tank 2 is respectively connected with a liquid hydrogen filling pipeline 3, a hydrogen supply pipeline 5 and a hydrogen utilization pipeline 11. The liquid hydrogen filling pipeline 3, the hydrogen supply pipeline 5 and the hydrogen utilization pipeline 11 all penetrate through the liquid hydrogen storage tank outer tank 1 and are respectively correspondingly installed with a liquid hydrogen filling valve 4, a hydrogen supply valve 6 and a fourth hydrogen valve 15.

[0020] The outer tank 1 and the inner tank 2 of the liquid hydrogen storage tank constitute the inner and outer main body parts of the multi-layer adiabatic liquid hydrogen storage tank, and the nitrogen adiabatic layer 7, the methane gas adiabatic layer 8, the carbon dioxide adiabatic layer 9 and the radiation adiabatic layer 10 are sequentially arranged between the two from inside to outside, so as to improve the adiabatic capacity.

[0021] The liquid hydrogen filling pipeline 3 is sequentially connected with the liquid hydrogen filling valve 4 and the bottom of the inner tank 2 of the liquid hydrogen storage tank, so as to realize liquid hydrogen filling; the hydrogen supply pipeline 5 is sequentially connected with the top of the inner tank 2 of the liquid hydrogen storage tank and the hydrogen supply valve 6, so as to realize safe discharge of the evaporated hydrogen in the inner tank 2 of the liquid hydrogen storage tank;

[0022] The hydrogen utilization pipeline 11 is sequentially connected with the first hydrogen valve 12, the second hydrogen valve 13, the third hydrogen valve 14 and the fourth hydrogen valve 15, and is connected with the methane cooling branch 17, the carbon dioxide cooling branch 20 and the radiation cooling branch 23, so as to realize regulation and control of different adiabatic capacities by using the cold energy of the evaporated hydrogen, and to realize emptying of the hydrogen.

[0023] In the embodiment, the nitrogen adiabatic structure includes the nitrogen adiabatic layer 7, and the upper and lower ends of the nitrogen adiabatic layer 7 are provided with closed porous adiabatic connection structures 16.

[0024] The closed porous adiabatic connection structures 16 are arranged on the upper and lower ends of the nitrogen adiabatic layer 7, and the cold energy of the inner tank 2 of the liquid hydrogen storage tank is used to realize a vacuum porous structure and weaken the heat conduction and heat transfer capacity of external heat.

[0025] In the embodiment, the methane gas adiabatic structure includes the methane gas adiabatic layer 8 and the first hydrogen valve 12 installed on the hydrogen utilization pipeline 11, the methane gas adiabatic layer 8 is embedded with the methane cooling branch 17, the methane cooling branch 17 is connected in parallel with the first hydrogen valve 12, a section of the methane cooling branch 17 located outside the methane gas adiabatic layer 8 is provided with the methane cooling valve 18, and a section of the methane cooling branch 17 located inside the methane gas adiabatic layer 8 is provided with the methane filling valve 19.

[0026] The methane cooling branch 17 is connected in parallel with the first hydrogen valve 12, the methane cooling valve 18 is arranged outside the methane gas adiabatic layer 8, and the methane filling valve 19 is arranged inside the methane gas adiabatic layer 8, so as to realize regulation and control of the state of the methane gas in the methane gas adiabatic layer 8.

[0027] In the embodiment, the carbon dioxide adiabatic structure includes the carbon dioxide adiabatic layer 9 and the second hydrogen valve 13 installed on the hydrogen utilization pipeline 11, the carbon dioxide adiabatic layer 9 is provided with the carbon dioxide cooling branch 20, the carbon dioxide cooling branch 20 is connected in parallel with the second hydrogen valve 13, and the carbon dioxide cooling branch 20 is respectively provided with the carbon dioxide filling valve 22 and the carbon dioxide cooling valve 21 corresponding to the inner and outer sections of the carbon dioxide adiabatic layer 9.

[0028] The carbon dioxide cooling branch 20 is connected in parallel with the second hydrogen valve 13, and the carbon dioxide cooling valve 21 is arranged outside the carbon dioxide heat insulation layer 9, and the carbon dioxide filling valve 2 is arranged inside, so as to realize the regulation of the carbon dioxide gas state in the carbon dioxide heat insulation layer 9.

[0029] In the embodiment, the radiation heat insulation structure includes the radiation heat insulation layer 10 and the third hydrogen valve 14 arranged on the hydrogen utilization pipeline 11, the radiation cooling branch 23 is arranged in the radiation heat insulation layer 10, the radiation cooling branch 23 is arranged in parallel with the third hydrogen valve 14, and the parahydrogen converter 25 and the radiation cooling valve 24 are arranged outside and inside the radiation heat insulation layer 10 respectively.

[0030] The radiation cooling branch 23 is connected in parallel with the third hydrogen valve 14, the radiation cooling valve 24 is arranged outside the radiation heat insulation layer 10, and the parahydrogen converter 25 is arranged inside, so as to maximize the utilization of the parahydrogen conversion cooling capacity of the hydrogen after being heated.

[0031] In the embodiment, the radiation heat insulation layer 10 is provided with the multilayer radiation shielding screen 26.

[0032] A method for using the vacuum multilayer heat insulation liquid hydrogen container, assuming that all valves are in a closed state, the nitrogen heat insulation layer 7 is filled with nitrogen gas filled during tank processing, and other gases are prevented from entering.

[0033] (1) Heat insulation gas filling

[0034] 1) The hydrogen utilization pipeline 11 is connected with a methane gas source at an outlet end, the fourth hydrogen valve 15, the third hydrogen valve 14, the second hydrogen valve 13, the first hydrogen valve 12, the methane cooling valve 18 and the methane filling valve 19 are opened in sequence, methane gas from the outside enters the methane gas heat insulation layer 8, a small amount of methane gas is filled, and then the first hydrogen valve 12, the methane cooling valve 18 and the methane filling valve 19 are closed in sequence, and the methane gas filling is completed.

[0035] 2) The hydrogen utilization pipeline 11 is connected with a carbon dioxide gas source at an outlet end, the carbon dioxide cooling valve 21 and the carbon dioxide filling valve 22 are opened in sequence, methane gas from the outside enters the carbon dioxide heat insulation layer 9, a small amount of carbon dioxide gas is filled, and then the second hydrogen valve 13, the carbon dioxide cooling valve 21 and the carbon dioxide filling valve 22 are closed in sequence, and the carbon dioxide gas filling is completed. After the heat insulation gas filling is completed, the third hydrogen valve 14 and the fourth hydrogen valve 15 are closed in sequence.

[0036] (2) Pre-cooling filling

[0037] 1) Open the liquid hydrogen filling valve 4, the methane cooling valve 18, the carbon dioxide cooling valve 21, the radiation cooling valve 24 and the fourth hydrogen valve 15 in turn, and connect the front end of the liquid hydrogen filling pipeline 3 to the liquid hydrogen source. Under the action of pressure, the external liquid hydrogen enters the liquid hydrogen filling pipeline 3, passes through the liquid hydrogen filling valve 4 and enters the bottom of the inner tank 2 of the liquid hydrogen storage tank. At this time, since the inner tank 2 of the liquid hydrogen storage tank is in a high-temperature state, the liquid hydrogen will be vaporized into low-temperature hydrogen gas, which then enters the hydrogen utilization pipeline 11 and successively passes through the methane cooling branch 17 by flowing through the methane cooling valve 18, enters the carbon dioxide cooling branch 20 by flowing through the carbon dioxide cooling valve 21, enters the radiation cooling branch 23 by flowing through the radiation cooling valve 24, and releases cold energy in the para-hydrogen converter 25, and then is exhausted through the fourth hydrogen valve 15.

[0038] 2) The nitrogen gas in the nitrogen gas adiabatic layer 7 gradually freezes under the cooling of the inner tank 2 of the liquid hydrogen storage tank, and a vacuum state is gradually formed inside. Similarly, the methane gas in the methane gas adiabatic layer 8 freezes under the cooling of the methane cooling branch 17, and a vacuum state is gradually formed inside. The carbon dioxide in the carbon dioxide adiabatic layer 9 freezes under the cooling of the carbon dioxide cooling branch 20, and a vacuum state is gradually formed inside. The temperature of the hydrogen gas entering the radiation cooling branch 23 has risen significantly, so the corresponding para-hydrogen conversion cold energy is maximized, and the multi-layer radiation shielding screen 26 is cooled, reducing the radiation ability of the high-temperature area. With the continuation of pre-cooling, the adiabatic ability of the nitrogen gas adiabatic layer 7, the methane gas adiabatic layer 8, the carbon dioxide adiabatic layer 9 and the radiation adiabatic layer 10 is continuously improved until the overall temperature of the inner tank 2 of the liquid hydrogen storage tank reaches the liquid hydrogen temperature.

[0039] 3) Start liquid hydrogen filling, and when the liquid level of the liquid hydrogen in the inner tank 2 of the liquid hydrogen storage tank reaches the set height, close the liquid hydrogen filling valve 4, complete the filling, and maintain the current state for long-period storage.

[0040] (3) Hydrogen supply

[0041] 1) Connect the hydrogen supply pipeline 5 to the subsequent hydrogen-using device, open the hydrogen supply valve 6, and start hydrogen supply;

[0042] 2) When it is necessary to increase the hydrogen supply amount, open the third hydrogen valve 14 and close the radiation cooling valve 24, so that hydrogen no longer enters the radiation adiabatic layer 10, and the corresponding radiation adiabatic ability is weakened;

[0043] 3) When it is necessary to further increase the hydrogen supply amount, on the basis of the above operation, continue to open the second hydrogen valve 13 and close the carbon dioxide cooling valve 21, so that hydrogen no longer enters the carbon dioxide adiabatic layer 9, and the solid carbon dioxide frozen in the carbon dioxide adiabatic layer 9 begins to vaporize, the vacuum degree is destroyed, and the heat conduction ability of the carbon dioxide adiabatic layer 9 is increased;

[0044] 4) When the hydrogen supply needs to be further increased, on the basis of the above operation, the first hydrogen valve 12 is continuously opened, the methane cooling valve 18 is closed, hydrogen no longer enters the methane gas insulation layer 8, the frozen solid methane in the methane gas insulation layer 8 starts to vaporize, the vacuum degree is destroyed, and the heat conduction capacity of the methane gas insulation layer 8 is increased;

[0045] 5) The above steps can be performed in sequence, reverse order or synchronously, and the sequence is determined according to the hydrogen supply demand.

[0046] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the present application according to the technical solution and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A vacuum multilayer adiabatic liquid hydrogen container comprising a liquid hydrogen storage tank outer can (1) and a liquid hydrogen storage tank inner can (2) located therein, characterized by, The liquid hydrogen storage tank outer tank (1) and the liquid hydrogen storage tank inner tank (2) are sequentially provided with nitrogen heat insulation structure, methane gas heat insulation structure, carbon dioxide heat insulation structure and radiation heat insulation structure from inside to outside, and the above structures layer by layer surround the space between the liquid hydrogen storage tank outer tank (1) and the liquid hydrogen storage tank inner tank (2), the liquid hydrogen storage tank inner tank (2) is respectively connected with a liquid hydrogen filling pipeline (3), a hydrogen supply pipeline (5) and a hydrogen utilization pipeline (11), the liquid hydrogen filling pipeline (3), the hydrogen supply pipeline (5) and the hydrogen utilization pipeline (11) all penetrate the liquid hydrogen storage tank outer tank (1) and are correspondingly provided with a liquid hydrogen filling valve (4), a hydrogen supply valve (6) and a fourth hydrogen valve (15); The nitrogen heat insulation structure comprises a nitrogen heat insulation layer (7), and the nitrogen heat insulation layer (7) is filled with nitrogen; The methane gas heat insulation structure comprises a methane gas heat insulation layer (8) and a first hydrogen valve (12) installed on the hydrogen utilization pipeline (11), a methane cooling branch (17) is embedded in the methane gas heat insulation layer (8), the methane cooling branch (17) is connected in parallel with the first hydrogen valve (12), a section of the methane cooling branch (17) located outside the methane gas heat insulation layer (8) is provided with a methane cooling valve (18), and a section of the methane cooling branch (17) located inside the methane gas heat insulation layer (8) is provided with a methane filling valve (19). The hydrogen utilization pipeline (11) and the methane filling valve (19) fill the methane into the methane gas heat insulation layer (8).

2. A vacuum multilayer adiabatic liquid hydrogen container according to claim 1, wherein The nitrogen heat insulation layer (7) is provided with a closed porous heat insulation connecting structure (16) at the upper end and the lower end.

3. A vacuum multilayer adiabatic liquid hydrogen container according to claim 2, wherein The carbon dioxide heat insulation structure comprises a carbon dioxide heat insulation layer (9) and a second hydrogen valve (13) installed on the hydrogen utilization pipeline (11), a carbon dioxide cooling branch (20) is arranged in the carbon dioxide heat insulation layer (9), the carbon dioxide cooling branch (20) is connected in parallel with the second hydrogen valve (13), and the carbon dioxide cooling branch (20) is correspondingly provided with a carbon dioxide filling valve (22) and a carbon dioxide cooling valve (21) at the sections located inside and outside the carbon dioxide heat insulation layer (9). The hydrogen utilization pipeline (11) and the carbon dioxide filling valve (22) fill the carbon dioxide into the carbon dioxide heat insulation layer (9).

4. A vacuum multilayer adiabatic liquid hydrogen container according to claim 3, wherein The radiation heat insulation structure comprises a radiation heat insulation layer (10) and a third hydrogen valve (14) installed on the hydrogen utilization pipeline (11), a radiation cooling branch (23) is arranged in the radiation heat insulation layer (10), the radiation cooling branch (23) is connected in parallel with the third hydrogen valve (14), and the radiation cooling branch (23) is correspondingly provided with a para-hydrogen converter (25) and a radiation cooling valve (24) at the sections located inside and outside the radiation heat insulation layer (10).

5. A vacuum multilayer adiabatic liquid hydrogen container according to claim 4, wherein The radiation heat insulation layer (10) is internally provided with a plurality of radiation shielding screens (26).

6. A method of using a vacuum multilayer adiabatic liquid hydrogen container according to claim 5, wherein The use method is as follows: It is assumed that all the valves are in a closed state, and the nitrogen heat insulation layer (7) is filled with nitrogen filled during tank processing, so as to prevent other gases from entering; (1) Heat insulation gas filling 1) Hydrogen utilization pipeline (11) outlet end connected to the methane gas source, open fourth hydrogen valve (15), third hydrogen valve (14), second hydrogen valve (13), first hydrogen valve (12), methane cooling valve (18), methane filling valve (19) in turn, the methane gas from the outside into the methane gas insulation layer (8), after filling a small amount of methane gas, close the first hydrogen valve (12), methane cooling valve (18), methane filling valve (19) in turn, complete the methane gas filling; 2) hydrogen utilization pipeline (11) outlet end connected to the carbon dioxide gas source, open carbon dioxide cooling valve (21), carbon dioxide filling valve (22) in turn, the methane gas from the outside into the carbon dioxide insulation layer (9), after filling a small amount of carbon dioxide gas, close the second hydrogen valve (13), carbon dioxide cooling valve (21), carbon dioxide filling valve (22) in turn, complete the carbon dioxide gas filling; after the completion of the insulation gas filling, close the third hydrogen valve (14), fourth hydrogen valve (15) in turn; (2) pre-cooling filling 1) open liquid hydrogen filling valve (4), methane cooling valve (18), carbon dioxide cooling valve (21), radiation cooling valve (24), fourth hydrogen valve (15) in turn, the front end of the liquid hydrogen filling pipeline (3) is connected to the liquid hydrogen source, under the action of pressure, the external liquid hydrogen enters the liquid hydrogen filling pipeline (3), passes through the liquid hydrogen filling valve (4) into the bottom of the inner tank (2) of the liquid hydrogen storage tank, at this time, because the inner tank (2) of the liquid hydrogen storage tank is in a high temperature state, the liquid hydrogen will be vaporized into low temperature hydrogen, which then enters the hydrogen utilization pipeline (11), and successively passes through the methane cooling valve (18) into the methane cooling branch (17), passes through the carbon dioxide cooling valve (21) into the carbon dioxide cooling branch (20), passes through the radiation cooling valve (24) into the radiation cooling branch (23), and releases cold energy in the para-hydrogen converter (25), and then is discharged through the fourth hydrogen valve (15); 2) the nitrogen in the nitrogen insulation layer (7) gradually freezes under the cooling of the liquid hydrogen storage tank inner tank (2), and a vacuum state is gradually formed inside; similarly, the methane in the methane insulation layer (8) freezes under the cooling of the methane cooling branch (17), and a vacuum state is gradually formed inside; the carbon dioxide in the carbon dioxide insulation layer (9) freezes under the cooling of the carbon dioxide cooling branch (20), and a vacuum state is gradually formed inside; the temperature of the hydrogen entering the radiation cooling branch (23) has risen significantly, so the corresponding para-hydrogen conversion cold energy is maximized, and the multi-layer radiation shielding screen (26) is cooled, reducing the radiation ability of the high temperature area; with the continuation of the pre-cooling, the insulation ability of the nitrogen insulation layer (7), the methane insulation layer (8), the carbon dioxide insulation layer (9) and the radiation insulation layer (10) is continuously improved, until the overall temperature of the liquid hydrogen storage tank inner tank (2) reaches the liquid hydrogen temperature; 3) start liquid hydrogen filling, when the liquid level of the liquid hydrogen in the liquid hydrogen storage tank inner tank (2) reaches the set height, close the liquid hydrogen filling valve (4), complete the filling, and keep the current state, for long period storage; (3) hydrogen supply 1) Hydrogen supply pipeline (5) is connected to the subsequent hydrogen device, open the hydrogen supply valve (6), start the hydrogen supply; 2) When the hydrogen supply amount needs to be increased, open the third hydrogen valve (14) and close the radiation cooling valve (24), hydrogen no longer enters the radiation insulation layer (10), and the corresponding radiation insulation capacity is weakened; 3) When the hydrogen supply amount needs to be further increased, on the basis of the above operation, continue to open the second hydrogen valve (13) and close the carbon dioxide cooling valve (21), hydrogen no longer enters the carbon dioxide insulation layer (9), the frozen solid carbon dioxide in the carbon dioxide insulation layer (9) begins to vaporize, the vacuum degree is destroyed, and the thermal conductivity of the carbon dioxide insulation layer (9) increases; 4) When the hydrogen supply amount needs to be further increased, on the basis of the above operation, continue to open the first hydrogen valve (12) and close the methane cooling valve (18), hydrogen no longer enters the methane gas insulation layer (8), the frozen solid methane in the methane gas insulation layer (8) begins to vaporize, the vacuum degree is destroyed, and the thermal conductivity of the methane gas insulation layer (8) increases; 5) The above steps can be performed in sequence, reverse order or simultaneously, depending on the hydrogen supply amount requirement.

Images