Hydrogen filling system for liquid hydrogen storage and transportation hydrogen filling station using the cold energy of para-orthohydrogen conversion

Abstract

The present invention relates to a hydrogen filling system for a liquid hydrogen storage and transportation type hydrogen filling station that utilizes the refrigeration of para-orthohydrogen conversion. The purpose of the present invention is to provide a hydrogen filling system for a liquid hydrogen storage and transportation type hydrogen filling station that utilizes the refrigeration of para-orthohydrogen conversion. The technical solution of the present invention is: a hydrogen filling system for a liquid hydrogen storage and transportation type hydrogen filling station that utilizes the refrigeration of para-orthohydrogen conversion, characterized in that it includes: a hydrogen storage cylinder group for storing hydrogen with a high parahydrogen content; a hydrogen filling machine for filling hydrogen into a target hydrogen cylinder; a hydrogen precooling module, which is arranged between the hydrogen storage cylinder group and the hydrogen filling machine, and has N para-orthohydrogen converters for completing the precooling of the filled hydrogen by absorbing heat during the conversion process of parahydrogen to orthohydrogen, and N≥1. The present invention is applicable to the field of hydrogen stations.

Description

Technical Field

[0001] The present invention relates to a hydrogen filling system for a liquid hydrogen storage and transportation type hydrogen filling station using the cold energy of para-ortho-hydrogen conversion, which is applicable to the field of hydrogen filling stations. Background Art

[0002] With the development of the national hydrogen energy strategy, hydrogen fuel cell vehicles have been rapidly promoted, and the construction of hydrogen refueling stations as important supporting facilities is also accelerating. Since the daily hydrogen refueling capacity of many hydrogen refueling stations will far exceed 1,000 kg in the future, liquid hydrogen storage and transportation hydrogen refueling stations will occupy a very important position in the future hydrogen energy industry chain, and can achieve more efficient hydrogen storage efficiency.

[0003] At present, hydrogen refueling stations mainly provide high-pressure hydrogen refueling services, with storage pressures of 35MPa and 70MPa. Due to the coke soup effect, high-pressure hydrogen will expand inside the bottle after being filled into the on-board hydrogen cylinder, causing the temperature inside the bottle to rise. The higher the filling pressure, the faster the temperature rises. Due to the fast filling speed, the on-board hydrogen storage cylinder cannot dissipate heat in time, and it is possible to exceed the 85°C specified by the current international standard, posing a huge safety hazard. Therefore, it is necessary to pre-cool the high-pressure hydrogen before filling.

[0004] At present, there are three main precooling methods. The first is to add a refrigeration cycle system between the high-pressure hydrogen source and the hydrogenator. The precooling effect is stable, but the power consumption is large; the second is to mix the liquid hydrogen at the outlet of the liquid hydrogen pump with the high-pressure hydrogen. The liquid hydrogen absorbs heat after evaporation to achieve the purpose of precooling, but there is a risk of liquid hydrogen regulation lag and imbalance, and the configuration system is relatively cumbersome; the third is to use the cold energy during the vaporization of liquid hydrogen to precool the high-pressure hydrogen, but because the time of liquid hydrogen vaporization and high-pressure hydrogen filling is difficult to reasonably match, it is usually necessary to configure a cold storage circulation system, which increases the complexity of the system and causes high-grade cold energy loss of liquid hydrogen vaporization. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the above-mentioned existing problems, a hydrogen filling system for a liquid hydrogen storage and transportation type hydrogen filling station using the cold energy of para-ortho-hydrogen conversion is provided.

[0006] The technical solution adopted by the present invention is: a hydrogen filling system for a liquid hydrogen storage and transportation type hydrogen filling station using the cold energy of para-orthohydrogen conversion, characterized in that it includes:

[0007] A hydrogen storage cylinder group is used to store hydrogen with a high parahydrogen content;

[0008] A hydrogen filling machine, used to fill hydrogen into a target hydrogen cylinder;

[0009] The hydrogen precooling module is arranged between the hydrogen storage cylinder group and the hydrogenator, and has N para-ortho-hydrogen converters for completing the precooling of the added hydrogen by absorbing heat during the conversion process of para-hydrogen to ortho-hydrogen, where N≥1.

[0010] The hydrogen precooling module includes N para-orthohydrogen converters and an access control pipeline capable of controlling the number of para-orthohydrogen converters connected between the hydrogen storage cylinder group and the hydrogenator.

[0011] The access control pipeline connects the N para-orthohydrogen converters in series, and each para-orthohydrogen converter is connected to the hydrogen storage cylinder group via a hydrogen valve.

[0012] Also includes:

[0013] The liquid hydrogen storage device is used to store liquid hydrogen with a high parahydrogen content and provide hydrogen for the hydrogen storage cylinder group.

[0014] The liquid hydrogen storage device comprises a station-use liquid hydrogen storage tank, which is connected to an air vaporizer for vaporizing liquid hydrogen via a liquid hydrogen pipeline, wherein a liquid hydrogen pump and a cryogenic medium heat exchanger are provided on the liquid hydrogen pipeline, and an air outlet of the air vaporizer is connected to the hydrogen storage cylinder group;

[0015] The low-temperature medium heat exchanger is connected to a cooling device for cooling the station liquid hydrogen storage tank using the cold energy generated by the vaporization of liquid hydrogen in the low-temperature medium heat exchanger.

[0016] The cooling device comprises a low-temperature cold screen covering the outside of the station liquid hydrogen storage tank, the outlet of the low-temperature cold screen is connected to the inlet of the low-temperature medium heat exchanger via a low-temperature medium circulation pipeline, and a low-temperature medium valve and a low-temperature medium pump are provided on the low-temperature medium circulation pipeline; the outlet of the low-temperature medium heat exchanger is connected to the inlet of the low-temperature cold screen via another low-temperature medium circulation pipeline.

[0017] The cryogenic medium in the cryogenic medium circulation pipeline is liquid nitrogen, liquid argon or carbon dioxide.

[0018] The low-temperature medium heat exchanger is a plate heat exchanger; the air evaporator is a fin-tube heat exchanger.

[0019] The secondary orthohydrogen converter is coated with a heat-insulating material.

[0020] The secondary ortho-hydrogen converter has a porous medium inside, and the surface of the porous medium is coated with a secondary ortho-hydrogen conversion catalyst.

[0021] The beneficial effects of the present invention are as follows: the present invention utilizes the secondary normal conversion process of high-pressure hydrogen itself to achieve the goal of hydrogen precooling, has a simple structure, is easy to operate, and does not require additional refrigeration or other cooling equipment.

[0022] The present invention controls the number of connected secondary orthohydrogen converters by connecting control pipelines, thereby achieving precise adjustment of the high-pressure hydrogen precooling temperature under different filling flow rates.

[0023] The present invention uses a low-temperature medium heat exchanger in conjunction with a cooling device to utilize the high-quality cold energy of liquid hydrogen vaporization for a low-temperature cold shield of a liquid hydrogen storage tank for a cooling station, thereby effectively reducing the loss of liquid hydrogen.

[0024] The coordinated use of the cooling capacity of the para-orthohydrogen conversion and the cooling capacity of the liquid hydrogen vaporization in the present invention realizes the efficient use of the cooling energy in the filling process, which is beneficial to improving the operating efficiency and overall stability of the liquid hydrogen storage and transportation type hydrogen filling station. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment.

[0026] In the figure: liquid hydrogen pipeline 1, station liquid hydrogen storage tank 2, cryogenic cold screen 3, liquid hydrogen valve 4, liquid hydrogen pump 5, cryogenic medium heat exchanger 6, air vaporizer 7, cryogenic medium circulation pipeline 8, cryogenic medium valve 9, cryogenic medium pump 10, 70MPa high-pressure hydrogen pipeline 11, 70MPa hydrogen storage cylinder group 12, first hydrogen valve 13, first secondary orthohydrogen converter 14, second secondary orthohydrogen converter 15, second hydrogen valve 16, 70MPa hydrogenator 17, 35MPa high-pressure hydrogen pipeline 18, 35MPa hydrogen storage cylinder group 19, third hydrogen valve 20, third secondary orthohydrogen converter 21, fourth secondary orthohydrogen converter 22, fourth hydrogen valve 23, 35MPa hydrogenator 24. DETAILED DESCRIPTION

[0027] like Figure 1 As shown, this embodiment is a hydrogen filling system for a liquid hydrogen storage and transportation type hydrogen filling station using the cold energy of para-orthohydrogen conversion, including a liquid hydrogen storage device, a hydrogen storage cylinder group, a hydrogen precooling module and a hydrogen filling machine, etc., which are connected in sequence.

[0028] In this embodiment, the liquid hydrogen storage device includes a station liquid hydrogen storage tank 2, a liquid hydrogen valve 4, a liquid hydrogen pump 5, a cryogenic medium heat exchanger 6 and an air vaporizer 7. The station liquid hydrogen storage tank 2 is connected to the air vaporizer 7 via a liquid hydrogen pipeline 1, and a liquid hydrogen valve 4, a liquid hydrogen pump 5 and a cryogenic medium heat exchanger 6 are sequentially arranged on the liquid hydrogen pipeline 1, wherein the cryogenic medium heat exchanger 6 is connected to a cooling device, and the cooling device utilizes the cold energy generated by the vaporization of liquid hydrogen in the cryogenic medium heat exchanger 6 to cool the station liquid hydrogen storage tank 2.

[0029] In this example, the cooling device has a low-temperature cold screen 3 covering the outside of the station liquid hydrogen storage tank 2. The outlet end of the low-temperature cold screen 3 is connected to the inlet end of the low-temperature medium heat exchanger 6 through a low-temperature medium circulation pipeline 8. The low-temperature medium circulation pipeline 8 is provided with a low-temperature medium valve 9 and a low-temperature medium pump 10; the outlet of the low-temperature medium heat exchanger 6 is connected to the inlet end of the low-temperature cold screen 3 through another low-temperature medium circulation pipeline 8.

[0030] In this embodiment, the cryogenic medium in the cryogenic medium circulation pipeline 8 can be liquid cryogenic medium with high safety characteristics such as liquid nitrogen, liquid argon and carbon dioxide. In this embodiment, the cryogenic medium heat exchanger 6 can be a plate heat exchanger, and the air vaporizer 7 can be a fin-tube heat exchanger.

[0031] In this embodiment, the hydrogen storage cylinder group includes a 70MPa hydrogen storage cylinder group 12 and a 35MPa hydrogen storage cylinder group 19. The 70MPa hydrogen storage cylinder group 12 and the 35MPa hydrogen storage cylinder group 19 each contain multiple high-pressure hydrogen storage cylinders. The outlet of the air vaporizer 7 is connected to the 70MPa hydrogen storage cylinder group 12 and the 35MPa hydrogen storage cylinder group 19 through the 70MPa high-pressure hydrogen pipeline 11 and the 35MPa high-pressure hydrogen pipeline 18 respectively.

[0032] In this embodiment, the liquid hydrogen in the station liquid hydrogen storage tank 2 is liquid hydrogen with a high parahydrogen content. After vaporization, it will still maintain the original para-ortho-hydrogen ratio in the absence of a catalyst. Therefore, the hydrogen in the 70MPa hydrogen storage cylinder group 12 and the 35MPa hydrogen storage cylinder group 19 is hydrogen with a high parahydrogen content (hydrogen with a parahydrogen content greater than 99%).

[0033] In this example, the 70MPa hydrogen storage cylinder group 12 is connected to the 70MPa hydrogenator 17 via a hydrogen precooling module, and the hydrogen precooling module includes two secondary orthohydrogen converters (a first and a second secondary orthohydrogen converter 15) and an access control pipeline, and the access control pipeline includes a 70MPa gas supply pipe and a 70MPa bypass pipeline, wherein the two ends of the 70MPa gas supply pipe are respectively connected to the 70MPa hydrogen storage cylinder group 12 and the 70MPa hydrogenator 17, and the first secondary orthohydrogen converter 14 and the second secondary orthohydrogen converter 15 are sequentially arranged on the 70MPa gas supply pipe along the hydrogen transportation direction; a first hydrogen valve 13 located on the 70MPa gas supply pipe is arranged between the 70MPa hydrogen storage cylinder group 12 and the first secondary orthohydrogen converter 14, and the 70MPa hydrogen storage cylinder group 12 and the second secondary orthohydrogen converter 15 are connected via a 70MPa bypass pipeline, and a second hydrogen valve 16 is arranged on the 70MPa bypass pipeline. The access control pipeline controls the number of secondary orthohydrogen converters connected between the 70MPa hydrogen storage cylinder group 12 and the 70MPa hydrogenator 17 by controlling the on-off of the first and second hydrogen valves.

[0034] In this embodiment, the 35MPa hydrogen storage cylinder group 19 is connected to the 35MPa hydrogenator 24 through a hydrogen precooling module. The hydrogen precooling module includes two secondary orthohydrogen converters (the third and fourth secondary orthohydrogen converters 22) and an access control pipeline. The access control pipeline includes a 35MPa gas supply pipe and a 35MPa bypass pipeline, wherein the two ends of the 35MPa gas supply pipe are respectively connected to the 35MPa hydrogen storage cylinder group 19 and the 35MPa hydrogenator 24, and the third secondary orthohydrogen converter 21 and the fourth secondary orthohydrogen converter 22 are sequentially arranged on the 35MPa gas supply pipe along the hydrogen transportation direction; a third hydrogen valve 20 located on the 35MPa gas supply pipe is provided between the 35MPa hydrogen storage cylinder group 19 and the third secondary orthohydrogen converter 21, and the 35MPa hydrogen storage cylinder group 19 is connected to the fourth secondary orthohydrogen converter 22 through a 35MPa bypass pipeline, and a fourth hydrogen valve 23 is provided on the 35MPa bypass pipeline. The access control pipeline controls the number of secondary orthohydrogen converters connected between the 35MPa hydrogen storage cylinder group 19 and the 35MPa hydrogenator 24 by controlling the on-off of the third and fourth hydrogen valves.

[0035] In this embodiment, a para-orthohydrogen converter is arranged between the high-pressure hydrogen storage cylinder group and the hydrogenator, so that the parahydrogen can be converted into orthohydrogen under the action of the catalyst, and the conversion process absorbs heat to complete the pre-cooling of the added hydrogen.

[0036] In this example, the outer surface of the secondary orthohydrogen converter is covered with insulating materials, so that the secondary orthohydrogen conversion process inside is adiabatic conversion. The secondary orthohydrogen converter has a porous medium inside, and the surface of the porous medium is coated with a secondary orthohydrogen conversion catalyst to increase the contact area between the catalyst and hydrogen.

[0037] The working principle of this embodiment is as follows:

[0038] First, assume that all valves, pumps and other equipment in the system are closed or stopped.

[0039] Step 1: Open the cryogenic medium valve 9 and the cryogenic medium pump 10. Driven by the pump, the cryogenic medium flows through the cryogenic medium circulation pipeline 8 in sequence through the cryogenic medium valve 9, the cryogenic medium pump 10, the cryogenic medium heat exchanger 6, and the cryogenic cold screen 3, and the cold energy generated by the vaporization of liquid hydrogen in the cryogenic medium heat exchanger 6 is transferred to the cryogenic cold screen 3, thereby improving the insulation performance of the station liquid hydrogen storage tank 2.

[0040] Step 2: Open the liquid hydrogen valve 4 and the liquid hydrogen pump 5. The liquid hydrogen in the station liquid hydrogen storage tank 2 flows through the liquid hydrogen pipeline 1, passes through the liquid hydrogen valve 4, and then enters the liquid hydrogen pump 5 for pressurization, and then enters the low-temperature medium heat exchanger 6 for initial vaporization. At this time, most of the liquid hydrogen has been vaporized, but it will still be in the liquid hydrogen temperature zone, and then enters the air vaporizer 7 to absorb the heat of the external air. The remaining small part of the liquid hydrogen is vaporized, and the hydrogen temperature is raised to near room temperature. Finally, the 70MPa hydrogen storage cylinder group 12 is filled through the 70MPa high-pressure hydrogen pipeline 11, and the 35MPa hydrogen storage cylinder group 19 is filled through the 35MPa high-pressure hydrogen pipeline 18.

[0041] Step 3: When 70MPa hydrogen is filled at a large flow rate (50-100% of the designed filling volume of the hydrogen filling station), the first hydrogen valve 13 is opened, and the high-pressure hydrogen of the 70MPa hydrogen storage cylinder group 12 passes through the first hydrogen valve 13, the first para-orthohydrogen converter 14 and the second para-orthohydrogen converter 15 in sequence, is cooled by para-orthohydrogen conversion, and then the large-flow filling is completed through the 70MPa hydrogen filling machine 1717.

[0042] When 70MPa hydrogen is filled at a relatively low flow rate (<50% of the designed filling volume of the hydrogen filling station), the second hydrogen valve 16 is opened, and the high-pressure hydrogen of the 70MPa hydrogen storage cylinder group 12 passes through the second hydrogen valve 16 and the second secondary orthohydrogen converter 15 in sequence, is cooled by secondary orthohydrogen conversion, and then is completed by the 70MPa hydrogenator 17 to complete the small flow filling.

[0043] When 35MPa hydrogen is filled at a large flow rate (50-100% of the designed filling volume of the hydrogen filling station), the third hydrogen valve 20 is opened, and the high-pressure hydrogen of the 35MPa hydrogen storage cylinder group 19 passes through the third hydrogen valve 20, the third secondary orthohydrogen converter 21 and the fourth secondary orthohydrogen converter 22 in sequence, is cooled by the secondary orthohydrogen conversion, and then the large-flow filling is completed through the 35MPa hydrogenator 24.

[0044] When 35MPa hydrogen is filled at a small flow rate (<50% of the designed filling volume of the hydrogen filling station), the fourth hydrogen valve 23 is opened, and the high-pressure hydrogen of the 35MPa hydrogen storage cylinder group 19 passes through the fourth hydrogen valve 23 and the fourth secondary orthohydrogen converter 22 in sequence, is cooled by secondary orthohydrogen conversion, and then passes through the 35MPa hydrogenator 24 to complete the small flow filling.

[0045] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A hydrogen filling system for a liquid hydrogen storage and transportation hydrogen filling station using the cold energy of para-orthohydrogen conversion, characterized in that: include: A hydrogen storage cylinder group is used to store hydrogen with a high parahydrogen content; A hydrogen filling machine, used to fill hydrogen into a target hydrogen cylinder; A hydrogen precooling module is arranged between the hydrogen storage cylinder group and the hydrogenator, and has N para-ortho-hydrogen converters, which are used to complete the precooling of the hydrogen filling by absorbing heat during the conversion process of para-hydrogen to ortho-hydrogen, where N≥1; The hydrogen precooling module includes N said para-orthohydrogen converters and an access control pipeline capable of controlling the number of para-orthohydrogen converters connected between the hydrogen storage cylinder group and the hydrogenator; The access control pipeline connects N of the para-orthohydrogen converters in series, and each para-orthohydrogen converter is connected to the hydrogen storage cylinder group via a hydrogen valve; It also includes: a liquid hydrogen storage device for storing liquid hydrogen with a high parahydrogen content and providing hydrogen for the hydrogen storage cylinder group; The liquid hydrogen storage device comprises a station-use liquid hydrogen storage tank, which is connected to an air vaporizer for vaporizing liquid hydrogen via a liquid hydrogen pipeline, wherein a liquid hydrogen valve, a liquid hydrogen pump and a cryogenic medium heat exchanger are provided on the liquid hydrogen pipeline, and an air outlet of the air vaporizer is connected to the hydrogen storage cylinder group; The low-temperature medium heat exchanger is connected to a cooling device for cooling the station liquid hydrogen storage tank by utilizing the cold energy generated by the vaporization of liquid hydrogen in the low-temperature medium heat exchanger; The cooling device comprises a low-temperature cold screen covering the outside of the station liquid hydrogen storage tank, the outlet end of the low-temperature cold screen is connected to the inlet of the low-temperature medium heat exchanger via a low-temperature medium circulation pipeline, and the low-temperature medium circulation pipeline is provided with a low-temperature medium valve and a low-temperature medium pump; The outlet of the low-temperature medium heat exchanger is connected to the inlet end of the low-temperature cold screen through another low-temperature medium circulation pipeline; Step 1: Open the cryogenic medium valve and the cryogenic medium pump. Driven by the pump, the cryogenic medium flows through the cryogenic medium circulation pipeline in sequence through the cryogenic medium valve, the cryogenic medium pump, the cryogenic medium heat exchanger, and the cryogenic cold screen. The cold energy generated by the vaporization of liquid hydrogen in the cryogenic medium heat exchanger is transferred to the cryogenic cold screen to improve the thermal insulation performance of the station's liquid hydrogen storage tank. Step 2: Open the liquid hydrogen valve and liquid hydrogen pump. The liquid hydrogen in the station's liquid hydrogen storage tank flows through the liquid hydrogen valve through the liquid hydrogen pipeline and enters the liquid hydrogen pump for pressurization. It then enters the low-temperature medium heat exchanger for initial vaporization. At this time, most of the liquid hydrogen has been vaporized, but it will still be in the liquid hydrogen temperature zone. It then enters the air vaporizer to absorb the heat of the external air. The remaining small amount of liquid hydrogen is vaporized and the hydrogen temperature is raised to near room temperature. Finally, the 70MPa hydrogen storage cylinder group is filled through the 70MPa high-pressure hydrogen pipeline, and the 35MPa hydrogen storage cylinder group is filled through the 35MPa high-pressure hydrogen pipeline; By opening and closing the first hydrogen valve and the second hydrogen valve, a larger flow rate of 70MPa hydrogen and a smaller flow rate of 70MPa hydrogen can be added; by opening and closing the third hydrogen valve and the fourth hydrogen valve, a larger flow rate of 35MPa hydrogen and a smaller flow rate of 35MPa hydrogen can be added; The 70MPa hydrogen storage cylinder group is connected to the 70MPa hydrogenator via a hydrogen precooling module, the hydrogen precooling module includes a first and a second secondary orthohydrogen converter and an access control pipeline, the access control pipeline includes a 70MPa gas supply pipe and a 70MPa bypass pipeline, wherein the two ends of the 70MPa gas supply pipe are respectively connected to the 70MPa hydrogen storage cylinder group and the 70MPa hydrogenator, and the 70MPa gas supply pipe is provided with a first secondary orthohydrogen converter and a second secondary orthohydrogen converter in sequence along the hydrogen transportation direction; a first hydrogen valve located on the 70MPa gas supply pipe is provided between the 70MPa hydrogen storage cylinder group and the first secondary orthohydrogen converter, the 70MPa hydrogen storage cylinder group is connected to the second secondary orthohydrogen converter via a 70MPa bypass pipeline, and a second hydrogen valve is provided on the 70MPa bypass pipeline, and the access control pipeline controls the number of secondary orthohydrogen converters connected between the 70MPa hydrogen storage cylinder group and the 70MPa hydrogenator by controlling the on-off of the first and second hydrogen valves; The 35MPa hydrogen storage cylinder group is connected to the 35MPa hydrogenator via a hydrogen precooling module, the hydrogen precooling module includes a third and a fourth secondary orthohydrogen converter and an access control pipeline, the access control pipeline includes a 35MPa gas supply pipe and a 35MPa bypass pipeline, wherein the two ends of the 35MPa gas supply pipe are respectively connected to the 35MPa hydrogen storage cylinder group and the 35MPa hydrogenator, and the third secondary orthohydrogen converter and the fourth secondary orthohydrogen converter are sequentially arranged on the 35MPa gas supply pipe along the hydrogen transportation direction; a third hydrogen valve located on the 35MPa gas supply pipe is provided between the 35MPa hydrogen storage cylinder group and the third secondary orthohydrogen converter, the 35MPa hydrogen storage cylinder group is connected to the fourth secondary orthohydrogen converter via a 35MPa bypass pipeline, and a fourth hydrogen valve is provided on the 35MPa bypass pipeline, and the access control pipeline controls the number of secondary orthohydrogen converters connected between the 35MPa hydrogen storage cylinder group and the 35MPa hydrogenator by controlling the on-off of the third and fourth hydrogen valves; The secondary ortho-hydrogen converter is coated with an insulating material; the secondary ortho-hydrogen converter has a porous medium inside, and the surface of the porous medium is coated with a secondary ortho-hydrogen conversion catalyst.

2. The hydrogen filling system of a liquid hydrogen storage and transportation type hydrogen filling station using the cold energy of para-orthohydrogen conversion according to claim 1 is characterized in that: The cryogenic medium in the cryogenic medium circulation pipeline is liquid nitrogen, liquid argon or carbon dioxide.

3. The hydrogen filling system of a liquid hydrogen storage and transportation type hydrogen filling station using the cold energy of para-orthohydrogen conversion according to claim 1 or 2, characterized in that: The low-temperature medium heat exchanger is a plate heat exchanger; the air evaporator is a fin-tube heat exchanger.

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