A supercritical liquid hydrogen storage system

Abstract

The supercritical liquid hydrogen storage system according to the present invention comprises a hydrogen processing unit for processing hydrogen into supercritical liquid hydrogen; the supercritical hydrogen storage unit comprises a tank body for storing liquid hydrogen, and a cooling cover is arranged outside the tank body; the cooling unit comprises a cooling unit for cooling the cooling cover, the supercritical hydrogen storage unit comprises an outer tank, a first insulation layer, a vacuum chamber, a cooling cover, a second insulation layer, and an inner tank which are arranged in sequence from the outside to the inside, the cooling unit comprises a Stirling refrigerator, a temperature sensor and a cooling unit, the Stirling refrigerator comprises a cold head, the temperature sensor is arranged in the cooling cover, the temperature sensor is connected to the Stirling refrigerator, the cooling unit comprises a first cooling member, a second cooling member, and a pulsating heat pipe, the first cooling member is connected to the cold head, the second cooling member is connected to the cooling cover, one end of the pulsating heat pipe is connected to the first cooling member, and the other end is connected to the second cooling member, so as to realize the cold exchange between the cold head and the cooling cover.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen energy storage, and in particular relates to a storage system for supercritical liquid hydrogen based on a Stirling refrigerator. Background Art

[0002] With the development of society and the improvement of people's material living standards, environmental protection issues are increasingly valued by people, and an important breakthrough in solving environmental problems is to find a clean energy source to reduce damage to the environment. Hydrogen energy, as a clean energy source, has the advantages of high combustion calorific value and abundant reserves. Hydrogen has good recyclability. After combustion, it produces water, which can be used to continue to produce hydrogen. Therefore, hydrogen is an ideal choice for future energy utilization. However, the storage and transportation of hydrogen during its use is a huge problem in modern industrial applications.

[0003] At present, there are two main ways to store and transport hydrogen: high-pressure hydrogen storage and low-temperature liquid hydrogen storage. High-pressure hydrogen storage is to compress hydrogen through certain mechanical equipment to continuously increase the pressure of hydrogen and then increase the density of hydrogen to achieve the purpose of storing more hydrogen in a small volume. However, this method places very high requirements on the material and wall thickness of the hydrogen storage tank, and the transportation cost is also relatively expensive.

[0004] Cryogenic liquid hydrogen storage is achieved by cooling the hydrogen to a temperature below the condensation point of 20K in a certain way, thereby liquefying the hydrogen and obtaining cryogenic liquid hydrogen. At normal temperatures, the equilibrium hydrogen is a mixture of 75% orthohydrogen and 25% parahydrogen, called normal hydrogen. Above normal temperature, the equilibrium composition of the ortho-parahydrogen state remains unchanged; below normal temperature, the equilibrium composition of the ortho-parahydrogen state will change, and as the temperature decreases, the percentage of parahydrogen will increase. The normal-parahydrogen conversion of hydrogen is an exothermic reaction, and the heat released during the conversion process will cause the liquid hydrogen to evaporate continuously. In order to reduce the evaporation loss of liquid hydrogen caused by the heat released during the conversion of the ortho-parahydrogen state, the parahydrogen content in the obtained liquid hydrogen product is required to be at least 95%. The density of liquid hydrogen is as high as 70kg / m 3 Although the storage density of hydrogen energy is very high, liquid hydrogen is prone to evaporation during transportation. On the one hand, the evaporation of liquid hydrogen will cause the pressure in the container tank to continue to increase, making the container tank more dangerous, and on the other hand, it will also cause a waste of liquid hydrogen. Summary of the invention

[0005] The present invention is made to solve the above-mentioned problem, and its purpose is to provide a storage system of supercritical liquid hydrogen based on Stirling refrigerator.

[0006] Supercritical hydrogen storage technology refers to keeping the pressure and temperature of hydrogen above the critical point and storing hydrogen in a supercritical state. The pressure of hydrogen in the critical point state is 1.296MPa and the temperature is 33.15K.

[0007] The present invention provides a supercritical liquid hydrogen storage system, which has the following characteristics: a hydrogen processing unit for processing hydrogen into supercritical liquid hydrogen; a supercritical hydrogen storage unit having a tank body for storing liquid hydrogen, a cooling hood being arranged outside the tank body; and a cooling unit having a cooling unit for cooling the cooling hood, wherein the supercritical hydrogen storage unit comprises an outer tank, a first insulation layer, a vacuum chamber, a cooling hood, a second insulation layer, and an inner tank which are arranged in sequence from the outside to the inside; the cooling unit comprises a Stirling refrigerator, a temperature sensor, and a cooling unit, the Stirling refrigerator having a cold head, the temperature sensor being arranged in the cooling hood, the temperature sensor being connected to the Stirling refrigerator, the cooling unit comprising a first cooling member, a second cooling member, and a pulsating heat pipe, the first cooling member being connected to the cold head, the second cooling member being connected to the cooling hood, one end of the pulsating heat pipe being connected to the first cooling member, and the other end being connected to the second cooling member, for realizing cold exchange between the cold head and the cooling hood.

[0008] The supercritical liquid hydrogen storage system provided by the present invention may also have the following feature: wherein the hydrogen processing unit cools the hydrogen to 90K through liquid nitrogen to achieve a supercritical state.

[0009] In addition, the supercritical liquid hydrogen storage system provided by the present invention may also have the following feature: wherein the cooling cover is arranged on the outside of the second insulation layer and is made of aluminum material.

[0010] In addition, the supercritical liquid hydrogen storage system provided by the present invention may also have the following characteristics: a first temperature sensor is arranged in the cooling hood, and when the temperature in the cooling hood rises to a predetermined value, the control unit receives the signal of the temperature sensor and controls the Stirling refrigerator to start working, and the cold head introduces cold energy into the cooling hood through a pulsating heat pipe to prevent the supercritical hydrogen in the inner tank from evaporating.

[0011] In addition, the supercritical liquid hydrogen storage system provided by the present invention may also have the following features: wherein the hydrogen processing unit includes a second temperature sensor, a flow regulating valve, and a hydrogen purification device, a hydrogen pressurizing device, and a hydrogen heat exchanger that are sequentially connected through pipelines, the flow regulating valve is arranged in the pipeline between the hydrogen pressurizing device and the hydrogen heat exchanger, the second temperature sensor is arranged in the pipeline connecting the outlet of the hydrogen heat exchanger and the flow regulating valve, and when the temperature changes, the opening size of the flow regulating valve is adjusted according to the feedback signal of the second temperature sensor.

[0012] In addition, the supercritical liquid hydrogen storage system provided by the present invention may also have the following feature: a pressure sensor is provided inside the inner tank for measuring the pressure of hydrogen in the inner tank.

[0013] In addition, the supercritical liquid hydrogen storage system provided by the present invention may also have the following features: wherein the cooling unit also includes a solar panel and a battery, and the solar panel is connected to the battery and the Stirling refrigerator, respectively, for charging the battery and driving the Stirling refrigerator to work.

[0014] In addition, the supercritical liquid hydrogen storage system provided by the present invention may also have the following feature: wherein, a plurality of grooves are provided on the first cooling member for installing a pulsating heat pipe.

[0015] In addition, the supercritical liquid hydrogen storage system provided by the present invention may also have the following features: the material of the pulsating heat pipe is a copper tube, the inner diameter of which is set to 0.05-0.2 mm, and the number of pipes is greater than 16.

[0016] Functions and Effects of the Invention

[0017] According to the supercritical liquid hydrogen storage system involved in the present invention, because the cooling mechanism of the Stirling refrigerator is connected to the cooling cover and is not directly connected to the inside of the storage tank, the supercritical liquid hydrogen storage system of the present invention can effectively prevent the cold energy of the supercritical hydrogen from leaking to the outside along the cooling mechanism.

[0018] In addition, in traditional high-pressure liquid hydrogen storage, since the evaporation temperature of hydrogen is very low, liquid hydrogen can easily evaporate into gas, and the pressure in the hydrogen storage tank continues to increase, increasing the danger of the hydrogen storage tank. However, the supercritical liquid hydrogen storage system of the present invention does not have the evaporation problem.

[0019] Furthermore, the supercritical liquid hydrogen storage system of the present invention adopts Stirling refrigeration to discharge the heat leaked in the supercritical hydrogen storage tank to the outside in time, and the safety of the hydrogen storage tank is well guaranteed.

[0020] Compared with high-pressure hydrogen storage tanks, supercritical hydrogen storage tanks have lower storage pressure and better safety and stability; compared with liquid hydrogen storage tanks, supercritical hydrogen storage tanks have higher storage temperature and less heat leakage to the outside world, making them easier to store. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a supercritical liquid hydrogen storage system in an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of a supercritical hydrogen storage unit in an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a safety protection unit in an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of the connection between the pulsating heat pipe and the cooling member in an embodiment of the present invention; and

[0025] Figure 5 Schematic diagram of the pipe connection between cooling elements in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments are combined with the accompanying drawings to specifically illustrate the supercritical liquid hydrogen storage system of the present invention.

[0027] Example

[0028] The supercritical liquid hydrogen storage system includes a hydrogen processing unit, a supercritical hydrogen storage unit 1, and a cooling unit.

[0029] like Figure 1 As shown, the hydrogen processing unit includes a liquid nitrogen cooling unit, a temperature sensor 15, a flow control valve 17, and a hydrogen purification device 6, a hydrogen pressurizing device 7, and a hydrogen heat exchanger 16 which are sequentially connected through pipelines.

[0030] The flow regulating valve 17 is arranged in the pipeline between the hydrogen pressurizing device 7 and the hydrogen heat exchanger 16, the temperature sensor 15 is arranged in the pipeline connecting the outlet of the hydrogen heat exchanger 16 and the flow regulating valve 17, and the circulation valve 13 is arranged in the pipeline 22 between the hydrogen heat exchanger 16 and the supercritical hydrogen storage part 1.

[0031] The liquid nitrogen cooling unit comprises an oil-free centrifugal turbo compressor 8, a turbine expansion compressor 9, a liquid nitrogen cooling device 10, and a gas-liquid separator 11 which are sequentially connected through pipelines.

[0032] The hydrogen processing unit first samples and tests the untreated hydrogen, purifies it in the hydrogen purification device 6, and then pressurizes the hydrogen in the hydrogen pressurizing device 7. After the pressure reaches the required value, the hydrogen exchanges heat with liquid nitrogen through the cooling hydrogen heat exchanger 16. The high-temperature hydrogen absorbs the coldness of the liquid nitrogen and then cools down, thereby increasing the density of hydrogen, and more hydrogen energy can be stored in the supercritical hydrogen storage unit 1. After the supercritical hydrogen comes out of the cooling hydrogen heat exchanger 16, since the temperature sensor 15 is provided at the pipeline, if the temperature of the supercritical hydrogen is too high, the temperature sensor 15 sends a feedback signal to reduce the opening of the flow control valve 17, and the hydrogen flow rate is reduced, so that the heat exchange between hydrogen and liquid nitrogen is more sufficient, so that the temperature of the supercritical hydrogen meets the requirements. In the embodiment, the temperature of the supercritical hydrogen can reach 90K to become supercritical hydrogen, increase the density of hydrogen, and then store the supercritical hydrogen in the supercritical hydrogen storage unit 1.

[0033] like Figure 1 As shown, the liquid nitrogen cooling unit cools the hydrogen in the cooling hydrogen heat exchanger 16. After cooling the hydrogen, the liquid nitrogen originally stored in the system becomes high-temperature nitrogen. The nitrogen is compressed into a high-temperature gas with a temperature of 300K and a pressure of 0.9MPa by the oil-free centrifugal turbo compressor 8. Then, the nitrogen after the initial pressurization is subjected to secondary pressurization and expansion throttling cooling through the turbine expansion compressor 9, so that the temperature of the gaseous nitrogen is reduced to 120K. Finally, the gaseous nitrogen is depressurized and cooled through the throttle valve 12, and the nitrogen changes from gas to liquid. The liquid nitrogen flows into the gas-liquid separator 11 for storage. The nitrogen gas at the top of the gas-liquid separator 11 will be heat exchanged with the nitrogen gas to be cooled through the liquid nitrogen cooling device 10, thereby improving the energy utilization rate. The nitrogen gas after sufficient heat exchange will be mixed with the nitrogen gas coming out of the cooling hydrogen heat exchanger 16 and then enter the compressor 8 again to be compressed. The liquid nitrogen will cool the hydrogen gas to 90K. After the liquid nitrogen absorbs the heat, it will become nitrogen gas and mix with the nitrogen gas coming out of the liquid nitrogen cooling device 10 to participate in the cycle of producing liquid nitrogen. Therefore, the cycle becomes a closed cycle, and the outside world does not need to provide raw gas to maintain the cycle. Compared with the need to cool down to 20K when hydrogen is liquefied, the device of this embodiment greatly reduces the waste of energy, and the density of the supercritical hydrogen produced is not too small, and the industrial application value is very high.

[0034] like Figure 2 , Figure 3 As shown, the supercritical hydrogen storage unit 1 includes an outer tank 101, an insulating layer 102, a vacuum chamber 103, a cooling cover 104, an insulating layer 105, an inner tank 106, and a safety protection unit.

[0035] Pipeline 22 is an inflow pipeline for supercritical hydrogen, and pipeline 29 is an outflow pipeline for hydrogen, which outputs hydrogen supplied to user 5 at the hydrogen filling station.

[0036] The inner tank 106 is an elliptical tank, which is connected to the pipeline 22 and the pipeline 29 respectively. The supercritical hydrogen passes through the circulation valve 13 before entering the inner tank 106 along the pipeline 22.

[0037] The heat insulating layer 105 is provided on the outside of the inner tank 106 .

[0038] The cooling cover 104 is arranged on the outer side of the heat insulating layer 105 , and the cooling cover 104 is made of aluminum material.

[0039] The outer tank 101 is the outermost layer of the supercritical hydrogen storage unit 1 , the heat insulating layer 102 is arranged on the inner side of the outer tank 101 , and a vacuum chamber 103 is arranged between the heat insulating layer 102 and the cooling cover 104 .

[0040] The insulation layer 102 and the insulation layer 105 both have multiple insulation layers, which are composed of many alternating layers of radiation screens with high reflectivity and spacers with low thermal conductivity. In the embodiment, the radiation screen material is aluminum foil, and the spacer material is nylon cloth.

[0041] The safety protection unit includes a pressure relief pipe 30 , a bellows 27 , a valve 28 , an inner tank explosion-proof device 26 , a safety valve 25 , an exhaust valve 24 , a pressure sensor 20 , a temperature sensor 21 , and a valve 23 .

[0042] The valve 23 is arranged in the pipeline 22, the valve 28 and the bellows 27 are arranged in the pipeline 29 respectively, and the bellows 27 is used for thermal contraction compensation.

[0043] The safety valve 25, the exhaust valve 24, and the inner tank explosion-proof device 26 are respectively arranged in the pressure relief pipe 30 connected to the inner tank 106. The inner tank explosion-proof device 26 prevents the pressure in the tank from being too high, thereby improving the safety of the supercritical hydrogen storage unit 1. By arranging the cooling cover 104 between the outer tank 101 and the inner tank 106, the influence of the refrigerator on the supercritical hydrogen storage unit 1 can be reduced, and the heat leaked into the tank from the outside can be guided out without increasing the loss of supercritical hydrogen cooling capacity in the supercritical hydrogen storage unit 1 to the outside.

[0044] A pressure sensor 20 and a temperature sensor 21 are respectively provided inside the inner tank 106, mainly to prevent the external temperature from being too high, causing the evaporation of hydrogen in the inner tank 106, so that the safety of the inner tank 106 is affected. When the pressure in the inner tank 106 is measured to be too high, the exhaust valve 24 and the safety valve 25 are opened to release a part of the evaporated supercritical hydrogen to ensure the safety of the hydrogen inner tank 106.

[0045] The cooling unit includes a Stirling refrigerator 2, a solar panel 3, a battery 4, a temperature sensor 19, and a cooling unit.

[0046] The solar cell panel 3 is connected to the battery 4 and the Stirling refrigerator 2 respectively, and is used for charging the battery 4 and driving the Stirling refrigerator 2 to work.

[0047] The Stirling refrigerator 2 has a cold head 203 . The temperature sensor 19 is arranged in the cooling cover 104 . The temperature sensor 19 is connected to a control unit of the Stirling refrigerator 2 .

[0048] The cooling unit includes a cooling member 107 , a pulsating heat pipe 18 , a cooling member 202 , and a housing 201 .

[0049] The cooling member 202 is cylindrical and is sleeved on the outside of the refrigerator cold head 203 for connecting the pulsating heat pipe.

[0050] A shell 201 is provided outside the cooling member 202 for fixing the pulsating heat pipe loop section. The shell 201 is divided into two parts, the left and right parts, which are fixedly connected by welding to form a shell assembly. The inside of the shell assembly is coated with an adhesive to fix it on the cooling member 202, and the outside is covered with an insulating material. In addition, since the loop pipe has an interface, the shell 201 needs to be processed with a corresponding notch.

[0051] In this embodiment, the cold exchange between the Stirling refrigerator cold head 203 and the cooling cover 104 is mainly achieved through the pulsating heat pipe 18 and the cooling members 202 and 107 .

[0052] The cooling cover 104 has a certain heat storage capacity, and the Stirling refrigerator 2 can introduce cold energy into the cooling cover 104, thereby reducing the impact of the pulsating heat pipe 18 on the inner tank 106.

[0053] like Figure 4 As shown, a plurality of grooves are formed on the cooling member 202 for installing the pulsating heat pipe 18 . The pulsating heat pipe 18 enters from one side of the groove and winds around the cooling member 202 .

[0054] The cooling member 107 has an elliptical shape which is the same as the cooling cover 104 , and the cooling member 107 is sleeved on the cooling cover 104 to transfer heat.

[0055] like Figure 5 As shown, the pipeline connection between the two cooling components, the solid pipeline at the cooling cover 104 end is the pipeline visible from the front view, and the dotted pipeline at the cooling cover 104 end is the pipeline on the back. The solid pipeline and the dotted pipeline are actually located at the same height. Multiple circles are set at different heights of the cooling mechanism, mainly to make the cooling of the cooling cover 104 more uniform.

[0056] When the inner tank 106 works normally, more and more supercritical hydrogen will be stored inside it. However, some heat will leak into the inner tank 106 from the outside. When heat leaks from the outside into the inner tank 106, since the cooling cover 104 is made of aluminum and has a certain heat storage capacity, the leakage heat from the outside will first increase the temperature of the cooling cover 104. Since a temperature sensor 19 is provided in the cooling cover 104, when the temperature exceeds a certain value, the temperature sensor 19 will send a feedback signal to start the Stirling refrigerator 2 to work. A cooling member 202 is provided on the cold head 203 of the Stirling refrigerator. The inner wall of the cooling member 202 is connected to the cold end of the refrigerator, and the outer wall is connected to the pulsating heat pipe 18. The working fluid used in the pulsating heat pipe 18 is N2. When the filling rate in the heat pipe 18 is 0.17-0.7, the operating temperature range of the heat pipe is 67-91K, and the transmission of cold energy can be achieved. The material of the pulsating heat pipe is copper tube, the inner diameter is set to 0.1mm, and the number of pipes is not less than 16. The heat pipe in the middle part of the Stirling refrigerator 2 and the cooling cover 104 needs to be wrapped with insulation material to prevent leakage of cold. The cold energy of the Stirling refrigerator 2 enters the cooling cover 104 through the cold head 203 and the pulsating heat pipe 18, so that the temperature of the cooling cover 104 is reduced. The temperature in the supercritical hydrogen storage part 1 is monitored in real time by the temperature sensor 21. When the Stirling refrigerator 2 cools the cooling cover 104, it only needs to reduce the temperature of the cooling cover 104 to the same temperature as the hydrogen energy temperature in the storage tank 1.

[0057] The supercritical liquid hydrogen storage system of this embodiment uses supercritical hydrogen to store hydrogen energy, which can not only prevent the evaporation of liquid hydrogen during use, but also ensure the hydrogen storage density. There is no need to consider the relationship between the conversion heat of normal and para hydrogen, and it can greatly reduce the waste of hydrogen energy. It can significantly reduce the waste of supercritical hydrogen due to evaporation and reduce the danger of the hydrogen storage tank.

[0058] Functions and Effects of the Embodiments

[0059] According to the supercritical liquid hydrogen storage system involved in this embodiment, because the cooling mechanism of the Stirling refrigerator is connected to the cooling cover and is not directly connected to the inside of the storage tank, the supercritical liquid hydrogen storage system of the present invention can effectively prevent the cold energy of supercritical hydrogen from leaking to the outside along the cooling mechanism.

[0060] In addition, in traditional high-pressure liquid hydrogen storage, since the evaporation temperature of hydrogen is very low, liquid hydrogen can easily evaporate into gas, and the pressure in the hydrogen storage tank continues to increase, increasing the danger of the hydrogen storage tank. However, the supercritical liquid hydrogen storage system of the present invention does not have the evaporation problem.

[0061] Furthermore, the supercritical liquid hydrogen storage system of this embodiment adopts Stirling refrigeration to discharge the heat leaked in the supercritical hydrogen storage tank to the outside in time, and the safety of the hydrogen storage tank is well guaranteed.

[0062] Compared with high-pressure hydrogen storage tanks, supercritical hydrogen storage tanks have lower storage pressure and better safety and stability; compared with liquid hydrogen storage tanks, supercritical hydrogen storage tanks have higher storage temperature and less heat leakage to the outside world, making them easier to store.

[0063] Furthermore, compared with the traditional high-pressure gaseous hydrogen storage method, the storage density of high-pressure gaseous hydrogen is 23kg / m 3 , while using supercritical hydrogen storage, at a pressure of 15MPa, the hydrogen storage density is 40.13kg / m 3 Therefore, relative to high-pressure gaseous hydrogen storage, the storage density can reach a higher value under lower storage pressure, thereby improving energy utilization efficiency.

[0064] Furthermore, in the process of producing liquid hydrogen, the temperature of hydrogen needs to be reduced to 20K, while in this embodiment, the temperature of hydrogen only needs to be reduced to 90K, which reduces power consumption and improves efficiency.

[0065] The above-mentioned embodiments are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A supercritical liquid hydrogen storage system, characterized in that: include: A hydrogen processing unit, used for processing hydrogen into supercritical liquid hydrogen; A supercritical hydrogen storage unit has a tank body for storing the liquid hydrogen, and a cooling cover is provided outside the tank body; and A cooling unit having a cooling unit for cooling the cooling cover, The supercritical hydrogen storage part includes an outer tank, a first insulation layer, a vacuum chamber, a cooling cover, a second insulation layer, and an inner tank, which are arranged in sequence from the outside to the inside. The cooling unit includes a Stirling refrigerator, a temperature sensor and a cooling unit. The Stirling refrigerator has a cold head, the temperature sensor is arranged in the cooling cover, and the temperature sensor is connected to the Stirling refrigerator. The cooling unit includes a first cooling member, a second cooling member, and a pulsating heat pipe. The first cooling member is connected to the cold head, and the second cooling member is connected to the cooling cover. One end of the pulsating heat pipe is connected to the first cooling member, and the other end is connected to the second cooling member, so as to realize the cold exchange between the cold head and the cooling cover.

2. The supercritical liquid hydrogen storage system according to claim 1, characterized in that: in, The hydrogen processing unit cools the hydrogen to 90K through liquid nitrogen to achieve a supercritical state.

3. The supercritical liquid hydrogen storage system according to claim 1, characterized in that: in, The cooling cover is arranged on the outer side of the second heat insulating layer and is made of aluminum material.

4. The supercritical liquid hydrogen storage system according to claim 1, characterized in that: in, A first temperature sensor is provided in the cooling hood. When the temperature in the cooling hood rises to a predetermined value, the control unit receives a signal from the temperature sensor and controls the Stirling refrigerator to start working. The cold head introduces cold energy into the cooling hood through the pulsating heat pipe to prevent the supercritical hydrogen in the inner tank from evaporating.

5. The supercritical liquid hydrogen storage system according to claim 1, characterized in that: in, The hydrogen processing unit includes a second temperature sensor, a flow control valve, and a hydrogen purification device, a hydrogen pressurizing device, and a hydrogen heat exchanger which are sequentially connected through pipelines. The flow regulating valve is arranged in the pipeline between the hydrogen pressurizing device and the hydrogen heat exchanger. The second temperature sensor is arranged in the pipeline connecting the outlet of the hydrogen heat exchanger and the flow regulating valve. When the temperature changes, the opening degree of the flow control valve is adjusted according to the feedback signal of the second temperature sensor.

6. The supercritical liquid hydrogen storage system according to claim 1, characterized in that: in, A pressure sensor is arranged inside the inner tank for measuring the pressure of hydrogen in the inner tank.

7. The supercritical liquid hydrogen storage system according to claim 1, characterized in that: in, The cooling unit also includes a solar panel and a battery. The solar cell panel is connected to the storage battery and the Stirling refrigerator respectively, and is used for charging the storage battery and driving the Stirling refrigerator to work.

8. The supercritical liquid hydrogen storage system according to claim 1, characterized in that: in, The first cooling member is provided with a plurality of grooves for mounting the pulsating heat pipe.

9. The supercritical liquid hydrogen storage system according to claim 1, characterized in that: in, The material of the pulsating heat pipe is a copper tube, the inner diameter of which is set to 0.05-0.2 mm, and the number of pipes is greater than 16.

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