Liquid hydrogen supercritical supply system and method

Abstract

The present invention relates to the field of liquid hydrogen technology, and in particular to a liquid hydrogen supercritical supply system and method. In this technical solution, a storage tank is vertically divided into two independent storage areas (i.e., a first cavity and a second cavity). In this way, when the temperature of the liquid hydrogen rises due to supercritical transition, exhaust cooling can be performed on any independent storage area. Subsequently, through the connecting channel of the two storage areas (i.e., a connecting component provided on a partition), a flow cycle is spontaneously performed under the drive of the temperature difference and the dynamic and static mixed flow to realize the cross-region transmission of cold energy, thereby realizing the overall cooling of the interior of the storage tank, eliminating the temperature rise caused by the supercritical transition, ensuring the stability of the liquid hydrogen supply, and extending the liquid hydrogen supply time.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid hydrogen, and in particular to a liquid hydrogen supercritical supply system and method. Background Art

[0002] As the global energy structure transforms towards clean and low-carbon, liquid hydrogen, with its 70.78kg / m 3 With its high storage density and transport efficiency 850 times that of gaseous hydrogen, liquid hydrogen has become a core energy storage medium in aerospace, heavy-duty transportation, and hydrogen refueling stations. By 2025, China's hydrogen refueling stations will exceed 1,000. Liquid hydrogen storage tanks, as critical infrastructure, have a direct impact on the safety and economic efficiency of hydrogen energy systems through their pressure control technology.

[0003] Hydrogen in normal state is often in a saturated state of gas and liquid phases. When the temperature and pressure of liquid hydrogen exceed its critical point (33.145K, 1.2965MPa), liquid hydrogen will enter a supercritical state and cause drastic changes in physical properties. In practical applications, especially in scenarios such as the refueling system of space launch sites and the rapid energy replenishment device of heavy hydrogen fuel cell vehicles, the supply pressure of the tank often needs to be increased to

[0004] 1.5 to 12 MPa to speed up transmission efficiency. At the same time, the boost gas is usually high-pressure hydrogen or helium with a temperature higher than the critical point temperature of 33.145K. Therefore, when the pressure in the tank is higher than 1.2965 MPa, as the high-temperature boost gas above the tank heats the liquid hydrogen, the temperature of the liquid hydrogen will gradually rise. When the temperature is also higher than the critical point temperature of 33.145K, this part of the liquid hydrogen will be converted into supercritical hydrogen. Due to the disappearance of the gas-liquid two-phase, the conventional gas-liquid phase change latent heat does not exist, resulting in excessive heat transfer of the high-temperature boost gas. At the same time, after the liquid hydrogen is converted into supercritical hydrogen, the density of hydrogen drops sharply, the viscosity increases by 2 to 3 times, and the surface tension weakens. This sudden change in physical properties puts key equipment such as traditional two-phase flow-based delivery pumps, flow meters, and pressure regulating valves at risk of failure, which is becoming a bottleneck restricting the in-depth application of hydrogen energy technology.

[0005] Therefore, there is an urgent need to provide a liquid hydrogen supercritical supply system and method to solve the above technical problems. Summary of the Invention

[0006] The embodiments of the present invention provide a liquid hydrogen supercritical supply system and method, which can effectively eliminate the adverse effects of supercritical transition and ensure the stability of liquid hydrogen supply.

[0007] In a first aspect, an embodiment of the present invention provides a liquid hydrogen supercritical supply system, comprising:

[0008] A storage tank having a partition disposed therein, the partition being used to divide the internal cavity of the storage tank into a first cavity and a second cavity, the first cavity and the second cavity being used to store liquid hydrogen to be supplied, and the partition being provided with a communication component for selectively communicating the first cavity and the second cavity;

[0009] a pressurizing assembly, disposed on the top of the storage tank and connected to the first cavity and the second cavity respectively, the pressurizing assembly being used to introduce pressurized gas into the first cavity and / or the second cavity;

[0010] an exhaust assembly disposed on the top of the storage tank and connected to the first cavity and the second cavity respectively, the exhaust assembly being used to discharge the hydrogen medium above the first cavity or the second cavity out of the storage tank;

[0011] a supply assembly, disposed at the bottom of the storage tank and in communication with the first cavity and the second cavity, respectively, and configured to supply liquid hydrogen to an external user end;

[0012] When the liquid hydrogen is converted into supercritical hydrogen, the boosting component is controlled to stop venting to the first cavity or the second cavity, and the exhaust component is controlled to exhaust the cavity with closed ventilation to achieve pressure reduction and temperature reduction of the cavity; after the pressure reduction and temperature reduction are completed, the exhaust of the cavity is closed and the boosting component is controlled to vent to the cavity until the pressure in the two cavities is equal, and the connecting component is opened to achieve spontaneous mixing of the hydrogen medium in the first cavity and the second cavity.

[0013] In a second aspect, an embodiment of the present invention provides a method for supplying supercritical liquid hydrogen, which is applied to the system described in the above embodiment, comprising:

[0014] Step S1, liquid hydrogen filling stage: open the first exhaust valve, the second exhaust valve, the liquid hydrogen filling valve, the first connecting valve, and the second connecting valve, adjust the openings of the first regulating valve and the second regulating valve to a fully open state, and supply external liquid hydrogen to the first cavity and the second cavity through the first supply pipeline and the second supply pipeline, respectively. When the liquid levels of the first cavity and the second cavity reach a preset height, stop filling the liquid hydrogen, close the liquid hydrogen filling valve, and adjust the openings of the first regulating valve and the second regulating valve to a fully closed state;

[0015] Step S2, liquid hydrogen supply stage: close the first exhaust valve and the second exhaust valve, open the first boost valve, the second boost valve and the liquid hydrogen supply valve, adjust the opening of the first regulating valve and the second regulating valve to 50%, and pass external pressurized gas into the first cavity and the second cavity through the first boost pipeline and the second boost pipeline respectively, so that the liquid hydrogen in the first cavity and the second cavity is supplied to the external user end through the liquid hydrogen supply valve;

[0016] Step S3, exhaust and cooling stage: including the exhaust and cooling stage for the first cavity and the exhaust and cooling stage for the second cavity, wherein:

[0017] The exhaust cooling stage for the first cavity includes: closing the first connecting valve and the second connecting valve, gradually adjusting the opening of the first regulating valve from 50% to 0%, gradually adjusting the opening of the second regulating valve from 50% to 100%, closing the first boosting valve, opening the first exhaust valve, and when the internal pressure of the first cavity is equal to atmospheric pressure, closing the first exhaust valve; opening the first boosting valve to pressurize the first cavity, and when the internal pressures of the first cavity and the second cavity are equal, opening the first connecting valve and the second connecting valve to achieve spontaneous mixing of the hydrogen medium in the first cavity and the second cavity, thereby reducing the temperature of the liquid hydrogen in the second cavity; gradually adjusting the opening of the first regulating valve from 0% to 50%, and gradually adjusting the opening of the second regulating valve from 100% to 50%, and resuming normal liquid supply;

[0018] The exhaust cooling stage for the second cavity includes: closing the first connecting valve and the second connecting valve, gradually adjusting the opening of the second regulating valve from 50% to 0%, gradually adjusting the opening of the first regulating valve from 50% to 100%, closing the second boost valve, opening the second exhaust valve, and when the internal pressure of the second cavity is equal to atmospheric pressure, closing the second exhaust valve; opening the second boost valve to pressurize the second cavity, and when the internal pressure of the second cavity is equal to that of the first cavity, opening the first connecting valve and the second connecting valve to achieve spontaneous mixing of the hydrogen medium in the first cavity and the second cavity, thereby reducing the temperature of the liquid hydrogen in the first cavity; gradually adjusting the opening of the second regulating valve from 0% to 50%, and gradually adjusting the opening of the first regulating valve from 100% to 50%, and resuming normal liquid supply.

[0019] An embodiment of the present invention provides a liquid hydrogen supercritical supply system and method, which vertically divides a storage tank into two independent storage areas (i.e., a first cavity and a second cavity). In this way, when the temperature of the liquid hydrogen rises due to supercritical transition, any independent storage area can be exhausted and cooled. Subsequently, through the connecting channel of the two storage areas (i.e., the connecting component arranged on the partition), the flow circulation is spontaneously performed under the drive of the temperature difference and the dynamic and static mixed flow to realize the cross-regional transmission of cold energy, thereby realizing the overall cooling of the interior of the storage tank, eliminating the temperature rise caused by the supercritical transition, ensuring the stability of the liquid hydrogen supply, and extending the liquid hydrogen supply time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of a liquid hydrogen supercritical supply system provided in an embodiment of the present invention.

[0022] Reference numerals:

[0023] 1-storage tank; 2-first cavity; 3-second cavity; 4-partition; 5-second connecting pipeline; 6-second connecting valve; 7-first connecting pipeline; 8-first connecting valve; 9-first exhaust pipeline; 10-first exhaust valve; 11-second exhaust pipeline; 12-second exhaust valve; 13-boosting pipeline; 14-first boosting valve; 15-second boosting valve; 16-filling supply pipeline; 17-first regulating valve; 18-second regulating valve; 19-liquid hydrogen filling valve; 20-liquid hydrogen supply valve. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a liquid hydrogen supercritical supply system, comprising:

[0026] The storage tank 1 is provided with a partition 4 inside. The partition 4 is used to divide the internal cavity of the storage tank 1 into a first cavity 2 and a second cavity 3. The first cavity 2 and the second cavity 3 are used to store liquid hydrogen to be supplied. The partition 4 is provided with a communication component for selectively connecting the first cavity 2 and the second cavity 3;

[0027] A booster assembly is provided at the top of the storage tank 1 and is in communication with the first cavity 2 and the second cavity 3, respectively. The booster assembly is used to introduce pressurized gas into the first cavity 2 and / or the second cavity 3;

[0028] An exhaust assembly is provided at the top of the storage tank 1 and is in communication with the first cavity 2 and the second cavity 3, respectively. The exhaust assembly is used to discharge the hydrogen medium above the first cavity 2 or the second cavity 3 out of the storage tank 1;

[0029] A supply assembly is provided at the bottom of the storage tank 1 and is in communication with the first cavity 2 and the second cavity 3, respectively, and is used to supply liquid hydrogen to an external user end;

[0030] When liquid hydrogen is converted into supercritical hydrogen, the boost component is controlled to stop venting to the first cavity 2 or the second cavity 3, and the exhaust component is controlled to exhaust the cavity with closed ventilation to achieve pressure reduction and temperature reduction of the cavity; after the pressure reduction and temperature reduction are completed, the exhaust of the cavity is closed and the boost component is controlled to vent to the cavity until the pressure in the two cavities is equal, and the connecting component is opened to achieve spontaneous mixing of the hydrogen medium in the first cavity 2 and the second cavity 3.

[0031] In this embodiment, the storage tank 1 is vertically divided into two independent storage areas (i.e., the first cavity 2 and the second cavity 3). In this way, when the temperature of the liquid hydrogen rises due to the supercritical transition, any independent storage area can be exhausted and cooled. Subsequently, through the connecting channel of the two storage areas (i.e., the connecting component arranged on the partition 4), the flow circulation is spontaneously carried out under the drive of the temperature difference and the dynamic and static mixed flow to realize the cross-regional transmission of cold energy, thereby realizing the overall cooling of the interior of the storage tank 1, eliminating the temperature rise caused by the supercritical transition, ensuring the stability of the liquid hydrogen supply, and extending the liquid hydrogen supply time.

[0032] That is to say, the above technical solution can effectively eliminate the adverse effects of supercritical transition and ensure the stability of liquid hydrogen supply by partitioning the conventional storage tank and exhausting and cooling any one of the partitions (i.e., the first cavity or the second cavity) when the temperature of liquid hydrogen rises too quickly due to supercritical transition.

[0033] Here, the principle of reducing the pressure and cooling the exhaust gas is specifically explained: Since the temperature and pressure of the supercharged gas are higher than the supercritical temperature and pressure of liquid hydrogen, the contact area between the supercharged gas and the liquid hydrogen inside the liquid hydrogen storage tank will produce a supercritical transition, that is, the liquid hydrogen is converted into supercritical hydrogen. Since the gas-liquid phase change disappears during the super transition process, the heat transfer rate of the supercharged gas will increase significantly, thereby affecting the subsequent supply time. When the amount of liquid hydrogen inside the storage tank cannot meet the set supply time (for example, the supply time can be predicted by setting a prediction model, the input variables of the model can be the initial liquid hydrogen level and liquid hydrogen supply flow rate of the storage tank and the pressure and temperature of the supercharged gas, and the output variable is the supply time of liquid hydrogen. The prediction model will not be described in detail here), the exhaust gas cooling operation can be performed at this time to eliminate the adverse effects of the supercritical transition of liquid hydrogen. When the cavity is vented, the pressure inside the cavity will drop rapidly. When the pressure value falls below the supercritical pressure of liquid hydrogen, the supercritical hydrogen inside the cavity will disappear. At the same time, some supercritical hydrogen will first be converted into non-equilibrium liquid hydrogen. As the pressure continues to drop, this part of the highly saturated liquid hydrogen will quickly vaporize, thereby generating cold energy, thus achieving the decompression and temperature reduction of the exhaust. At this time, the gas-liquid two-phase state in the cavity is restored again, and when the liquid hydrogen temperature at the liquid phase interface is equal to the liquid hydrogen saturation temperature corresponding to the external atmospheric pressure of 20.28K, it indicates that the cavity has completely eliminated the influence of the supercritical transition.

[0034] Furthermore, after exhaust cooling, the heat transfer rate of the pressurized gas caused by supercritical transition is reduced to a certain extent, which can extend the liquid hydrogen supply time inside the tank. Therefore, the number of exhaust cooling operations can be determined based on the specific liquid hydrogen supply time. During the actual supply process, since exhaust cooling will cause a certain amount of hydrogen loss, the exhaust times can be sufficient to meet the overall supply requirements.

[0035] It is worth noting that this solution does not mean that one partition stops working when the other partition is working (i.e., supplying liquid hydrogen), but that the two partitions can work at the same time. However, this solution uses the cooling of one of the partitions to achieve cooling of the entire liquid hydrogen, which is crucial for some special working conditions. For example, during the variable working condition test, the liquid hydrogen supply needs to be adjusted, and the flow adjustment range is large. The former can only achieve a flow adjustment of 0-50% at most, while the latter can achieve a flow adjustment of 0-100%. The essential reason for the difference is that the overall liquid hydrogen cooling is achieved by using the connecting components set inside the storage tank.

[0036] In one embodiment of the present invention, the partition 4 is a metal partition with fins, so that the cold energy generated by the exhaust cooling of supercritical hydrogen can be quickly transferred to the interior of the storage tank 1, thereby accelerating the response speed of the system cooling. Moreover, when the temperature rise of the liquid hydrogen caused by the supercritical transition is small, the exhaust cooling operation only needs to be performed on a single storage area, thereby reducing the complexity of the system operation.

[0037] In some embodiments, the fins of the finned metal partition may be high thermal conductivity copper fins, and extend to both sides of the first cavity 2 and the second cavity 3 respectively to further improve the cooling effect.

[0038] In one embodiment of the present invention, the connecting component includes a first connecting line 7 arranged at the top of the partition 4 and a second connecting line 5 arranged at the bottom of the partition 4. The first connecting line 7 is provided with a first connecting valve 8, and the first connecting line 7 is connected to the first cavity 2 and the second cavity 3 respectively. The second connecting line 5 is provided with a second connecting valve 6, and the second connecting line 5 is connected to the first cavity 2 and the second cavity 3 respectively.

[0039] In this embodiment, the first connecting pipe 7 can realize the circulation of hydrogen medium (i.e., hydrogen and supercritical hydrogen) at the top of the liquid hydrogen storage tank, and the second connecting pipe 5 can realize the circulation of hydrogen medium (i.e., liquid hydrogen) at the bottom of the liquid hydrogen storage tank. By setting the first connecting valve 8 and the second connecting valve 6, independent control and spontaneous mixing of hydrogen media can be effectively achieved.

[0040] In one embodiment of the present invention, the boost assembly includes a first boost line communicating with the first cavity 2 and a second boost line communicating with the second cavity 3 ( Figure 1 The first boosting pipeline is provided with a first boosting valve 14, and the second boosting pipeline is provided with a second boosting valve 15.

[0041] In this embodiment, the first pressurizing pipeline can achieve the effect of pressurizing the first cavity 2 , and the second pressurizing pipeline can achieve the effect of pressurizing the second cavity 3 .

[0042] In one embodiment of the present invention, the exhaust assembly includes a first exhaust pipe 9 connected to the first cavity 2 and a second exhaust pipe 11 connected to the second cavity 3. A first exhaust valve 10 is provided on the first exhaust pipe 9, and a second exhaust valve 12 is provided on the second exhaust pipe 11.

[0043] In this embodiment, the first exhaust pipeline 9 can exhaust and cool the first cavity 2, and the second exhaust pipeline 11 can exhaust and cool the second cavity 3. The first exhaust pipeline 9 and the second exhaust pipeline 11 are both connected to the hydrogen exhaust pipe.

[0044] In one embodiment of the present invention, the supply assembly includes a first supply pipeline communicating with the first cavity 2 and a second supply pipeline communicating with the second cavity 3 . A first regulating valve 17 is provided on the first supply pipeline, and a second regulating valve 18 is provided on the second supply pipeline.

[0045] In one embodiment of the present invention, a filling supply pipeline 16 is further included. A liquid hydrogen filling valve 19 and a liquid hydrogen supply valve 20 are provided on the filling supply pipeline 16. The filling supply pipeline 16 is connected to the first supply pipeline and the second supply pipeline respectively.

[0046] In one embodiment of the present invention, the volumes of the first cavity 2 and the second cavity 3 are the same.

[0047] In this embodiment, by ensuring that the volumes of the first cavity 2 and the second cavity 3 are the same, the first regulating valve 17 and the second regulating valve 18 are adjusted to specific openings (for example, the opening of the first regulating valve 17 is gradually adjusted from 50% to 0%, and the opening of the second regulating valve 18 is gradually adjusted from 50% to 100%, or the opening of the first regulating valve 17 is gradually adjusted from 0% to 50%, and the opening of the second regulating valve 18 is gradually adjusted from 100% to 50%), the liquid hydrogen supply flow rate can be maintained at the set value, thereby improving the stability of the system.

[0048] In one embodiment of the present invention, the pressurized gas is hydrogen or helium with a temperature higher than 33.145K and a pressure higher than 1.5MPa.

[0049] In some embodiments, insulation materials are provided on the exterior of components such as the storage tank 1 and the filling supply pipeline 16 to prevent heat leakage.

[0050] In addition, an embodiment of the present invention further provides a liquid hydrogen supercritical supply method, which is applied to the system mentioned in any of the above embodiments, including:

[0051] Step S1, liquid hydrogen filling stage: open the first exhaust valve 10, the second exhaust valve 12, the liquid hydrogen filling valve 19, the first connecting valve 8 and the second connecting valve 6, adjust the openings of the first regulating valve 17 and the second regulating valve 18 to the fully open state, and supply external liquid hydrogen to the first cavity 2 and the second cavity 3 through the first supply pipeline and the second supply pipeline respectively. When the liquid levels of the first cavity 2 and the second cavity 3 reach a preset height, stop filling the liquid hydrogen, close the liquid hydrogen filling valve 19, and adjust the openings of the first regulating valve 17 and the second regulating valve 18 to the fully closed state;

[0052] Step S2, liquid hydrogen supply stage: close the first exhaust valve 10 and the second exhaust valve 12, open the first boost valve 14, the second boost valve 15 and the liquid hydrogen supply valve 20, adjust the opening of the first regulating valve 17 and the second regulating valve 18 to 50%, and pass the external pressurized gas into the first cavity 2 and the second cavity 3 through the first boost pipeline and the second boost pipeline, so that the liquid hydrogen in the first cavity 2 and the second cavity 3 is supplied to the external user end through the liquid hydrogen supply valve 20;

[0053] Step S3, exhaust cooling stage: includes the exhaust cooling stage for the first cavity 2 and the exhaust cooling stage for the second cavity 3, wherein:

[0054] The exhaust cooling stage for the first chamber 2 includes: closing the first connecting valve 8 and the second connecting valve 6, gradually adjusting the opening of the first regulating valve 17 from 50% to 0%, gradually adjusting the opening of the second regulating valve 18 from 50% to 100%, closing the first boosting valve 14, opening the first exhaust valve 10, and when the internal pressure of the first chamber 2 is equal to the atmospheric pressure, closing the first exhaust valve 10; opening the first boosting valve 14 to pressurize the first chamber 2, and when the internal pressures of the first chamber 2 and the second chamber 3 are equal, opening the first connecting valve 8 and the second connecting valve 6 to achieve spontaneous mixing of the hydrogen medium in the first chamber 2 and the second chamber 3, thereby reducing the temperature of the liquid hydrogen in the second chamber 3; gradually adjusting the opening of the first regulating valve 17 from 0% to 50%, and gradually adjusting the opening of the second regulating valve 18 from 100% to 50%, and resuming normal liquid supply;

[0055] The exhaust and cooling stage for the second chamber 3 includes: closing the first connecting valve 8 and the second connecting valve 6, gradually adjusting the opening of the second regulating valve 18 from 50% to 0%, gradually adjusting the opening of the first regulating valve 17 from 50% to 100%, closing the second boosting valve 15, opening the second exhaust valve 12, and when the internal pressure of the second chamber 3 is equal to the atmospheric pressure, closing the second exhaust valve 12; opening the second boosting valve 15 to pressurize the second chamber 3, and when the internal pressure of the second chamber 3 is equal to that of the first chamber 2, opening the first connecting valve 8 and the second connecting valve 6 to achieve spontaneous mixing of the hydrogen medium in the first chamber 2 and the second chamber 3, thereby reducing the temperature of the liquid hydrogen in the first chamber 2; gradually adjusting the opening of the second regulating valve 18 from 0% to 50%, and gradually adjusting the opening of the first regulating valve 17 from 100% to 50%, and resuming normal liquid supply.

[0056] It can be understood that the method embodiment and system embodiment provided by the present invention are based on the same inventive concept and have the same beneficial effects. The beneficial effects of the method embodiment will not be described in detail here.

[0057] It should be noted that, in this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical factors in the process, method, article or device comprising the elements.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A liquid hydrogen supercritical supply system, characterized in that: include: A storage tank having a partition disposed therein, the partition being used to divide the internal cavity of the storage tank into a first cavity and a second cavity, the first cavity and the second cavity being used to store liquid hydrogen to be supplied, and the partition being provided with a communication component for selectively communicating the first cavity and the second cavity; a pressurizing assembly, disposed on the top of the storage tank and connected to the first cavity and the second cavity respectively, the pressurizing assembly being used to introduce pressurized gas into the first cavity and / or the second cavity; an exhaust assembly disposed on the top of the storage tank and connected to the first cavity and the second cavity respectively, the exhaust assembly being used to discharge the hydrogen medium above the first cavity or the second cavity out of the storage tank; a supply assembly, disposed at the bottom of the storage tank and in communication with the first cavity and the second cavity, respectively, and configured to supply liquid hydrogen to an external user end; When the liquid hydrogen is converted into supercritical hydrogen, the boosting component is controlled to stop venting to the first cavity or the second cavity, and the exhaust component is controlled to exhaust the cavity with closed ventilation to achieve pressure reduction and temperature reduction of the cavity; after the pressure reduction and temperature reduction are completed, the exhaust of the cavity is closed and the boosting component is controlled to vent to the cavity until the pressure in the two cavities is equal, and the connecting component is opened to achieve spontaneous mixing of the hydrogen medium in the first cavity and the second cavity.

2. The system according to claim 1, wherein: The partition is a metal partition with fins.

3. The system according to claim 2, characterized in that The connecting component includes a first connecting pipe arranged at the top of the partition and a second connecting pipe arranged at the bottom of the partition, the first connecting pipe is provided with a first connecting valve, and the first connecting pipe is respectively connected to the first cavity and the second cavity, the second connecting pipe is provided with a second connecting valve, and the second connecting pipe is respectively connected to the first cavity and the second cavity.

4. The system according to claim 3, characterized in that The boost assembly includes a first boost pipeline communicating with the first cavity and a second boost pipeline communicating with the second cavity. A first boost valve is provided on the first boost pipeline, and a second boost valve is provided on the second boost pipeline.

5. The system according to claim 4, characterized in that The exhaust assembly includes a first exhaust pipeline communicating with the first cavity and a second exhaust pipeline communicating with the second cavity. A first exhaust valve is provided on the first exhaust pipeline, and a second exhaust valve is provided on the second exhaust pipeline.

6. The system according to claim 5, characterized in that The supply assembly includes a first supply pipeline communicating with the first cavity and a second supply pipeline communicating with the second cavity. A first regulating valve is provided on the first supply pipeline, and a second regulating valve is provided on the second supply pipeline.

7. The system according to claim 6, characterized in that It also includes a filling supply pipeline, on which a liquid hydrogen filling valve and a liquid hydrogen supply valve are provided, and the filling supply pipeline is communicated with the first supply pipeline and the second supply pipeline respectively.

8. The system according to claim 7, characterized in that The first cavity and the second cavity have the same volume.

9. The system according to claim 8, characterized in that The pressurized gas is hydrogen or helium with a temperature higher than 33.145K and a pressure higher than 1.5MPa.

10. A method for supplying supercritical liquid hydrogen, characterized in that: The system as claimed in claim 9, comprising: Step S1, liquid hydrogen filling stage: open the first exhaust valve, the second exhaust valve, the liquid hydrogen filling valve, the first connecting valve, and the second connecting valve, adjust the openings of the first regulating valve and the second regulating valve to a fully open state, and supply external liquid hydrogen to the first cavity and the second cavity through the first supply pipeline and the second supply pipeline, respectively. When the liquid levels of the first cavity and the second cavity reach a preset height, stop filling the liquid hydrogen, close the liquid hydrogen filling valve, and adjust the openings of the first regulating valve and the second regulating valve to a fully closed state; Step S2, liquid hydrogen supply stage: close the first exhaust valve and the second exhaust valve, open the first boost valve, the second boost valve and the liquid hydrogen supply valve, adjust the opening of the first regulating valve and the second regulating valve to 50%, and pass the external pressurized gas into the first cavity and the second cavity through the first boost pipeline and the second boost pipeline respectively, so that the liquid hydrogen in the first cavity and the second cavity is supplied to the external user end through the liquid hydrogen supply valve; Step S3, exhaust and cooling stage: including the exhaust and cooling stage for the first cavity and the exhaust and cooling stage for the second cavity, wherein: The exhaust cooling stage for the first cavity includes: closing the first connecting valve and the second connecting valve, gradually adjusting the opening of the first regulating valve from 50% to 0%, gradually adjusting the opening of the second regulating valve from 50% to 100%, closing the first boosting valve, opening the first exhaust valve, and when the internal pressure of the first cavity is equal to atmospheric pressure, closing the first exhaust valve; opening the first boosting valve to pressurize the first cavity, and when the internal pressures of the first cavity and the second cavity are equal, opening the first connecting valve and the second connecting valve to achieve spontaneous mixing of the hydrogen medium in the first cavity and the second cavity, thereby reducing the temperature of the liquid hydrogen in the second cavity; gradually adjusting the opening of the first regulating valve from 0% to 50%, and gradually adjusting the opening of the second regulating valve from 100% to 50%, and resuming normal liquid supply; The exhaust cooling stage for the second cavity includes: closing the first connecting valve and the second connecting valve, gradually adjusting the opening of the second regulating valve from 50% to 0%, gradually adjusting the opening of the first regulating valve from 50% to 100%, closing the second boost valve, opening the second exhaust valve, and when the internal pressure of the second cavity is equal to atmospheric pressure, closing the second exhaust valve; opening the second boost valve to pressurize the second cavity, and when the internal pressure of the second cavity is equal to that of the first cavity, opening the first connecting valve and the second connecting valve to achieve spontaneous mixing of the hydrogen medium in the first cavity and the second cavity, thereby reducing the temperature of the liquid hydrogen in the first cavity; gradually adjusting the opening of the second regulating valve from 0% to 50%, and gradually adjusting the opening of the first regulating valve from 100% to 50%, and resuming normal liquid supply.

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