Portable liquid hydrogen supply equipment

Abstract

The invention discloses portable liquid hydrogen supply equipment which comprises a hydrogen storage tank which is of a hollow structure and is internally used for storing liquid hydrogen; the bypass valve is arranged on the hydrogen storage tank and is communicated with the hydrogen storage tank; the temporary storage bottle is communicated with the bypass valve through a liquid conveying pipe and is used for temporarily storing liquid hydrogen discharged by the hydrogen tank; the safety valve is communicated with the buffer bottle through an infusion tube; the gas using valve is communicated with the safety valve and is used for discharging liquid hydrogen. According to the portable liquid hydrogen supply equipment provided by the invention, a proper amount of liquid hydrogen is introduced into the buffer bottle through the bypass valve by virtue of the hydrogen storage tank, the buffer bottle can stabilize the pressure and flow of the hydrogen, fluctuation possibly caused by direct hydrogen supply is reduced, and the safety of the equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen supply equipment, and more specifically to a portable liquid hydrogen supply equipment. Background Art

[0002] As the world pays more and more attention to clean energy and sustainable development, the application and development of hydrogen energy as a green, efficient and renewable energy has received widespread attention. In the hydrogen energy industry chain, liquid hydrogen has become an important choice for long-distance heavy-duty vehicles, distributed energy systems and industrial applications due to its advantages such as high energy storage density, low working pressure, good safety and high purity. However, the storage, transportation and supply technology of liquid hydrogen has always been a key factor restricting its large-scale application. Traditionally, the preparation and storage of liquid hydrogen mainly rely on compression, cryogenic refrigeration and pressure reduction to achieve the liquefaction of hydrogen.

[0003] However, the research and development of liquid hydrogen supply equipment still faces many challenges. On the one hand, the liquefaction process of liquid hydrogen requires extremely low temperature conditions, and there are problems such as high energy consumption and complex equipment in the liquefaction process; on the other hand, the storage and transportation of liquid hydrogen have extremely high requirements on the safety and sealing of the equipment. Once a leak occurs, it will bring serious safety hazards.

[0004] In summary, how to improve the safety of liquid hydrogen supply equipment is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a portable liquid hydrogen supply device having high safety performance.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A portable liquid hydrogen supply device, comprising:

[0008] The hydrogen storage tank is a hollow structure, and its interior is used to store liquid hydrogen;

[0009] A bypass valve, disposed on the hydrogen storage tank and connected to the hydrogen storage tank;

[0010] A buffer bottle, connected to the bypass valve through a liquid infusion tube, and used to temporarily store liquid hydrogen discharged from the hydrogen storage tank;

[0011] A safety valve connected to the buffer bottle through the infusion tube;

[0012] A gas valve is connected to the safety valve and is used to discharge the liquid hydrogen.

[0013] Preferably, the bypass valve includes a first port, a second port and a third port, the first port is connected to the hydrogen storage tank, the second port is connected to the cache bottle, the third port is connected to the safety valve through the infusion tube, and a one-way valve is provided on the infusion tube between the third port and the safety valve.

[0014] Preferably, it also includes a bracket and a filling valve, the bracket is arranged on the hydrogen storage tank, the filling valve is arranged on the bracket and connected with the hydrogen storage tank, and the filling valve is used to connect with hydrogen replenishing equipment and replenish liquid hydrogen into the hydrogen storage tank.

[0015] Preferably, it also includes a pressure detection component, which is arranged on the hydrogen storage tank and used to detect the pressure in the hydrogen storage tank. The filling valve is provided with an emergency pressure relief component, which is used to discharge hydrogen when the pressure in the hydrogen storage tank is too high.

[0016] Preferably, it also includes a control system, which is electrically connected to the bypass valve, the safety valve, the gas valve and the filling valve and is used to control the opening or closing of the same.

[0017] Preferably, two pressure detection components are provided, and the two pressure detection components are respectively arranged in the hydrogen storage tank and the cache bottle. Both of the two pressure detection components are connected to the control system signal and are used to transmit the pressure detection results to the control system.

[0018] Preferably, the hydrogen storage tank includes an inner tank and an outer tank, the inner tank is arranged inside the outer tank, and a first support member and a second support member are provided between the inner tank and the outer tank, the first support member is an annular structure and is sleeved on the outer circumference of the inner tank, and the inner circumference of the first support member is provided with a tip for supporting the inner tank, and the second support member is arranged inside the outer tank and is used to limit the inner tank in the axial direction.

[0019] Preferably, a spiral filling pipe is provided between the outer tank and the inner tank, the filling pipe is connected to the filling valve and the inner tank, the inner wall of the filling pipe is provided with a thermal insulation coating, and the outer periphery of the filling pipe is provided with an insulating pipe.

[0020] Preferably, the outer tank is provided with a vacuum nozzle, and the vacuum nozzle is used to connect a vacuum pumping component. The hydrogen storage tank is provided with a vacuum detection component, and the vacuum detection component is used to detect the vacuum degree between the inner tank and the outer tank.

[0021] Preferably, a heat insulation layer is provided on the hydrogen storage tank.

[0022] The present invention provides a portable liquid hydrogen supply device, wherein a bypass valve connected to the interior of the hydrogen storage tank is arranged on the hydrogen storage tank, the bypass valve is connected to a buffer bottle, a safety valve and a gas valve in sequence, when it is necessary to discharge liquid hydrogen through the gas valve, the hydrogen storage tank first introduces a proper amount of liquid hydrogen into the buffer bottle through the bypass valve, the buffer bottle can stabilize the pressure and flow of hydrogen, reduce fluctuations that may be caused by direct hydrogen supply, and finally the hydrogen is discharged from the gas outlet of the gas valve through the safety valve and the gas valve for use by the hydrogen-using unit, thereby improving the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the structure of the portable liquid hydrogen supply equipment provided by the present invention;

[0025] Figure 2 This is a structural schematic diagram of the portable liquid hydrogen supply device provided by the present invention from another perspective;

[0026] Figure 3 This is a schematic diagram of the internal structure of the hydrogen storage tank provided by the present invention.

[0027] Reference numerals:

[0028] 1-hydrogen storage tank; 101-inner tank; 102-outer tank; 2-bypass valve; 3-buffer bottle; 4-safety valve; 5-gas valve; 6-check valve; 7-bracket; 8-filling valve; 9-first support member; 10-second support member; 11-filling pipe; 12-vacuum nozzle. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The core of the present invention is to provide a portable liquid hydrogen supply device, which can stabilize the pressure and flow of the hydrogen supply process through a buffer bottle to improve safety.

[0031] It should be noted that the directions or positional relationships indicated by “upper”, “lower”, “front”, “back”, etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0032] The present application provides a portable liquid hydrogen supply device, comprising: a hydrogen storage tank 1, a bypass valve 2, a buffer bottle 3, a safety valve 4 and a gas valve 5;

[0033] The hydrogen storage tank 1 is a hollow structure, and its interior is used to store liquid hydrogen;

[0034] The bypass valve 2 is disposed on the hydrogen storage tank 1 and is in communication with the hydrogen storage tank 1;

[0035] The buffer bottle 3 is connected to the bypass valve 2 through a liquid infusion tube, and the buffer bottle 3 is used to temporarily store the liquid hydrogen discharged from the hydrogen tank 1;

[0036] The safety valve 4 is connected to the buffer bottle 3 through the infusion tube;

[0037] The gas valve 5 is connected to the safety valve 4 and is used to discharge liquid hydrogen.

[0038] Specifically, the hydrogen storage tank 1 is a hollow structure, and the cavity inside it is used to store liquid hydrogen. A bypass valve 2 is provided on the outside of the hydrogen storage tank 1. The bypass valve 2 is connected to the inside of the hydrogen storage tank 1. The bypass valve 2 is connected to the cache bottle 3, the safety valve 4, and the gas valve 5 in sequence. It should be clear that the communication between the multiple valves of the present application is achieved through a liquid infusion tube. When hydrogen needs to be supplied from the inside of the hydrogen storage tank 1 to the outside, the liquid hydrogen in the hydrogen storage tank 1 first enters the cache bottle 3 through the bypass valve 2. The cache bottle 3 can temporarily store liquid hydrogen. The liquid hydrogen needs to be converted into hydrogen when used by the gas unit, and then the hydrogen is transferred to the cache bottle 3 through the gas inlet. 3. A larger area of ​​hydrogen is realized. When liquid hydrogen is converted into hydrogen gas, its volume increases. The main function of the buffer bottle 3 is to provide a buffer space in the process of liquid hydrogen being converted into hydrogen gas and its volume increasing sharply, so as to smoothly transition the pressure change and prevent the subsequent pipelines and equipment from being impacted. The buffer bottle 3 also has a certain pressure stabilizing function to ensure that the pressure of hydrogen output to the gas-using unit is stable within a certain range to meet the needs of the gas-using equipment. Finally, it is discharged from the outlet of the gas valve 5 through the safety valve 4 and the gas valve 5 for use by the hydrogen-using unit, thereby improving the safety performance of the equipment.

[0039] Based on the above embodiment, the bypass valve 2 includes a first port, a second port and a third port. The first port is connected to the hydrogen storage tank 1, the second port is connected to the cache bottle 3, and the third port is connected to the safety valve 4 through an infusion tube, and a one-way valve 6 is arranged on the infusion tube between the third port and the safety valve 4.

[0040] Specifically, the bypass valve 2 is provided with three ports, and the third port of the bypass valve 2 is directly connected to the safety valve 4 through the infusion tube to achieve communication with the gas valve 5. The buffer bottle 3 can perform buffer transition and pressure stabilization when the air pressure increases to ensure the stable hydrogen delivery of the gas-using unit. The one-way valve 6 ensures that liquid hydrogen can only flow from the bypass valve 2 to the gas valve 5 in one direction to prevent backflow. The one-way valve 6 automatically opens when the pressure in the buffer bottle 3 or the hydrogen storage tank 1 is abnormal to protect the safety of the system. It should be noted that when the pressure in the hydrogen storage tank 1 or the buffer bottle 3 is too high, the hydrogen pushes the one-way valve 6 through the bypass valve 2 and is discharged directly from the outlet of the gas valve 5 through the safety valve 4.

[0041] In some embodiments, a bracket 7 and a filling valve 8 are also included. The bracket 7 is arranged on the hydrogen storage tank 1, and the filling valve 8 is arranged on the bracket 7 and connected to the hydrogen storage tank 1. The filling valve 8 is used to connect to the hydrogen replenishing equipment and replenish liquid hydrogen into the hydrogen storage tank 1.

[0042] Specifically, the bracket 7 includes two parts, and the two parts are both arranged below the hydrogen storage tank 1. The two parts of the bracket 7 are two plate-like structures with an acute angle, and there is a certain space between the two parts. The bracket 7 can not only support the hydrogen storage tank 1, but also set the buffer bottle 3 inside the bracket 7. The filling valve 8 has a first inlet and a first outlet. The first inlet of the filling valve 8 is connected to the hydrogen replenishing equipment. The filling valve 8 not only has a basic switching function, but also can control the flow rate of liquid hydrogen through the switch, so that the filling rate of liquid hydrogen can be adjusted according to actual needs to ensure the safety and efficiency of the filling process.

[0043] On the basis of the above embodiment, it also includes a pressure detection component, which is arranged on the hydrogen storage tank 1 and is used to detect the pressure in the hydrogen storage tank 1. The filling valve 8 is provided with an emergency pressure relief component, which is used to discharge hydrogen when the pressure in the hydrogen storage tank 1 is too high.

[0044] Specifically, during the filling process, liquid hydrogen is prone to heat exchange with the outside when flowing from the filling valve 8, and a part of the liquid hydrogen may be converted into gas. Therefore, when it enters the inner cavity of the hydrogen storage tank 1, it will cause the pressure in the hydrogen storage tank 1 to rise faster than expected. Therefore, it is necessary to set a pressure detection component on the hydrogen storage tank 1. The detection head of the pressure detection component is arranged inside the hydrogen storage tank 1, and the pressure in the hydrogen storage tank 1 is detected. The pressure detection component is electrically connected to the emergency pressure relief component. When the pressure detection component detects that the pressure in the hydrogen storage tank 1 exceeds the preset value, the hydrogen in the hydrogen storage tank 1 is discharged through the emergency pressure relief component to reduce the pressure in the hydrogen storage tank 1.

[0045] Optionally, the emergency pressure relief assembly may be drained and passed into the adsorbent to avoid safety hazards caused by hydrogen emissions.

[0046] Optionally, the pressure detection component may use a component such as an RPM4 precision pressure measuring instrument that can detect both air pressure and hydraulic pressure.

[0047] On the basis of the above embodiment, a control system is also included, which is electrically connected to the bypass valve 2, the safety valve 4, the gas valve 5, and the filling valve 8 and is used to control the opening or closing of the same.

[0048] Specifically, the bypass valve 2, the safety valve 4, the gas valve 5 and the emergency pressure relief components on the filling valve 8 can all be electrically connected to the control system, and the opening or closing of the above-mentioned multiple valves is controlled by the control system. Generally speaking, whether hydrogen needs to be supplied to the outside is determined by sending a signal through the external control system, which is connected to the control system in this application, and the above-mentioned valves are opened by an electronic control method to realize the supply of hydrogen.

[0049] On the basis of the above embodiment, two pressure detection components are provided, and the two pressure detection components are respectively arranged in the hydrogen storage tank 1 and the buffer bottle 3. Both pressure detection components are connected to the control system signal and are used to transmit the pressure detection results to the control system.

[0050] Specifically, a pressure detection component is respectively provided in the hydrogen storage tank 1 and the cache bottle 3. The pressure detection component in the cache bottle 3 is used to detect the pressure in the cache bottle 3 to determine whether the hydrogen content in the cache bottle 3 is sufficient. If the hydrogen content in the cache bottle 3 is sufficient, there is no need for the hydrogen storage tank 1 to introduce hydrogen into the cache bottle 3. If the hydrogen content in the cache bottle 3 is insufficient, a signal is sent to the control system, and the control system will control the bypass valve 2 to open and supply hydrogen to the cache bottle 3.

[0051] On the basis of the above embodiment, the hydrogen storage tank 1 includes an inner tank 101 and an outer tank 102. The inner tank 101 is arranged inside the outer tank 102. A first support member 9 and a second support member 10 are arranged between the inner tank 101 and the outer tank 102. The first support member 9 is an annular structure and is sleeved on the outer periphery of the inner tank 101. The inner periphery of the first support member 9 is provided with a tip for supporting the inner tank 101. The second support member 10 is arranged inside the outer tank 102 and is used to limit the inner tank 101 in the axial direction.

[0052] Specifically, the inner tank 101 and the outer tank 102 are both hollow components. The inner tank 101 is arranged in the outer tank 102. The inner tank 101 is positioned by the first support member 9 and the second support member 10 to prevent the inner tank 101 from directly contacting the outer tank 102. The setting of the first support member 9 and the second support member 10 can greatly reduce the contact area between the outer tank 102 and the inner tank 101, and can reduce the heat transfer path between the two.

[0053] For the first support member 9 and the second support member 10, each first support member 9 is provided with at least three tips on the inner circumference. The first support member 9 is generally provided with two tips, and the positioning of the inner tank 101 is achieved by point contact. The size of the first support member 9 and the tip should be set smaller under the premise of ensuring the structural strength. There are two second support members 10, and they are respectively arranged at the axial ends of the inner tank 101. The second support member 10 and the outer tank 102 are detachably connected. During installation, the first support member 9 and a second support member 10 can be used to position the inner tank 101 first, and then the second second support member 10 can be used to achieve the axial positioning of the inner tank 101. It should be noted that this design not only reduces the path of heat conduction, but also further reduces the efficiency of heat transfer by point contact. The tip surface may also be coated with a low-emissivity coating to reduce radiant heat loss. The tip of the support member is precisely aligned with the surface of the inner tank, and an appropriate preload force is applied to ensure stable contact without damaging the inner tank.

[0054] On the basis of the above embodiment, a spiral filling pipe 11 is provided between the outer tank 102 and the inner tank 101, the filling pipe 11 is connected to the filling valve 8 and the inner tank 101, the inner wall of the filling pipe 11 is provided with an insulating coating, and the outer periphery of the filling pipe 11 is provided with an insulating pipe.

[0055] Specifically, the filling tube 11 is a spiral capillary tube. The spiral capillary tube structure requires the fluid to move along a spiral path when flowing in the tube. The spiral capillary tube increases the path length of the fluid flow, prolongs the time that the liquid hydrogen stays in the filling tube 11, and slows down the flow rate of the liquid hydrogen in the filling tube. The spiral capillary tube increases the flow path of the liquid hydrogen between the inner tank 101 and the outer tank 102, so that the liquid hydrogen can reduce heat loss before reaching the inner tank 101.

[0056] Optionally, the filling tube 11 and the inner tank 101 are preferably connected by welding or directly integrated into one piece, so that during the installation of the first support member 9, the first support member 9 can be rotated to a specified position, or the first support member 9 is initially set as a strip-shaped component with a pointed end, and during installation, the strip-shaped first support member 9 can be bent and fitted to a specified position on the outer periphery of the inner tank 101 to achieve positioning of the first support member 9.

[0057] On the basis of the above embodiment, a vacuum nozzle 12 is provided on the outer tank 102, and the vacuum nozzle 12 is used to connect the vacuum pumping component. A vacuum detection component is provided on the hydrogen storage tank 1, and the vacuum detection component is used to detect the vacuum degree between the inner tank 101 and the outer tank 102.

[0058] Specifically, a vacuum nozzle 12 is provided on the surface of the outer tank 102, which is connected to the vacuum assembly through the vacuum nozzle 12. The vacuum assembly can vacuum the space between the inner tank 101 and the outer tank 102. In this way, heat cannot be transferred between the inner tank 101 and the outer tank 102 through the air, thereby reducing heat conduction and convection of air molecules.

[0059] On the basis of the above-mentioned embodiment, a heat insulation layer is provided on the hydrogen storage tank 1 .

[0060] Specifically, a very thin layer of silver is plated on the inner wall surface of the outer tank 102. Silver has a high reflectivity to infrared radiation and can significantly reduce the heat radiated outward from the inner tank 101. The silver plating process needs to be carried out in a clean room to ensure the quality and uniformity of the coating. At the same time, multiple layers of thermal insulation are set up, which can effectively block the paths of thermal radiation and heat conduction to achieve the best thermal insulation effect.

[0061] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0062] The portable liquid hydrogen supply equipment provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A portable liquid hydrogen supply device, characterized in that: include: The hydrogen storage tank (1) is a hollow structure, and its interior is used to store liquid hydrogen; A bypass valve (2) is provided on the hydrogen storage tank (1) and is in communication with the hydrogen storage tank (1); A buffer bottle (3) is connected to the bypass valve (2) via a liquid infusion tube, and the buffer bottle (3) is used to temporarily store liquid hydrogen discharged from the hydrogen storage tank (1); A safety valve (4) connected to the buffer bottle (3) through the infusion tube; A gas valve (5) is connected to the safety valve (4) and is used to discharge the liquid hydrogen.

2. The portable liquid hydrogen supply equipment according to claim 1, characterized in that: The bypass valve (2) comprises a first port, a second port and a third port, the first port being connected to the hydrogen storage tank (1), the second port being connected to the buffer bottle (3), the third port being connected to the safety valve (4) via the infusion tube, and a one-way valve (6) being provided on the infusion tube between the third port and the safety valve (4).

3. The portable liquid hydrogen supply equipment according to claim 1, characterized in that: It also includes a bracket (7) and a filling valve (8), wherein the bracket (7) is arranged on the hydrogen storage tank (1), and the filling valve (8) is arranged on the bracket (7) and is connected to the hydrogen storage tank (1), and the filling valve (8) is used to connect to a hydrogen replenishing device and replenish liquid hydrogen into the hydrogen storage tank (1).

4. The portable liquid hydrogen supply equipment according to claim 3, characterized in that: It also includes a pressure detection component, which is arranged on the hydrogen storage tank (1) and is used to detect the pressure in the hydrogen storage tank (1). The filling valve (8) is provided with an emergency pressure relief component, which is used to discharge hydrogen when the pressure in the hydrogen storage tank (1) is too high.

5. The portable liquid hydrogen supply equipment according to claim 4, characterized in that: It also includes a control system, which is electrically connected to the bypass valve (2), the safety valve (4), the gas valve (5), and the filling valve (8) and is used to control the opening or closing of the same.

6. The portable liquid hydrogen supply equipment according to claim 5, characterized in that: The pressure detection components are provided with two, and the two pressure detection components are respectively arranged in the hydrogen storage tank (1) and in the buffer bottle (3), and the two pressure detection components are both connected to the control system signal and are used to transmit the pressure detection results to the control system.

7. The portable liquid hydrogen supply equipment according to claim 6, characterized in that: The hydrogen storage tank (1) comprises an inner tank (101) and an outer tank (102); the inner tank (101) is arranged inside the outer tank (102); a first support member (9) and a second support member (10) are arranged between the inner tank (101) and the outer tank (102); the first support member (9) is an annular structure and is sleeved on the outer circumference of the inner tank (101); and a tip for supporting the inner tank (101) is arranged on the inner circumference of the first support member (9); and the second support member (10) is arranged inside the outer tank (102) and is used to limit the inner tank (101) in the axial direction.

8. The portable liquid hydrogen supply equipment according to claim 7, characterized in that: A spiral filling pipe (11) is provided between the outer tank (102) and the inner tank (101); the filling pipe (11) is in communication with the filling valve (8) and the inner tank (101); an inner wall of the filling pipe (11) is provided with a heat insulating coating; and an outer sleeve of the filling pipe (11) is provided with a heat insulating pipe.

9. The portable liquid hydrogen supply equipment according to claim 8, characterized in that: The outer tank (102) is provided with a vacuum nozzle (12), and the vacuum nozzle (12) is used to connect a vacuum pumping component. The hydrogen storage tank (1) is provided with a vacuum detection component, and the vacuum detection component is used to detect the vacuum degree between the inner tank (101) and the outer tank (102).

10. The portable liquid hydrogen supply equipment according to any one of claims 1 to 9, characterized in that: The hydrogen storage tank (1) is provided with a heat insulation layer.

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