Liquid hydrogen storage tank

Abstract

The invention provides a liquid hydrogen storage tank which comprises a storage tank body used for storing liquid hydrogen raw materials and a flow guiding device, the flow guiding device comprises a plurality of liquid conveying assemblies arranged in the circumferential direction of the storage tank body at intervals, and the liquid inlet ends of the liquid conveying assemblies communicate with the lower portion of the storage tank body; the liquid outlet ends of the liquid conveying assemblies are connected with the upper portion of the storage tank body and used for guiding liquid hydrogen raw materials on the lower portion of the storage tank body to the upper portion of the storage tank body, and an ortho-parahydrogen conversion catalyst used for converting ortho-hydrogen into parahydrogen is arranged in at least one liquid conveying assembly. According to the liquid hydrogen storage tank, the liquid conveying assemblies capable of guiding liquid hydrogen on the lower portion of the storage tank body to the upper portion are arranged on the outer wall of the liquid hydrogen storage tank body, and the ortho-parahydrogen conversion catalyst used for converting ortho-hydrogen into parahydrogen is arranged in at least one liquid conveying assembly, so that ortho-parahydrogen component balance in the storage tank body can be maintained; and the converted and released heat is guided to the outside of the storage tank body, heat leakage is reduced, and the safety performance of the liquid hydrogen storage tank is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cryogenic liquid storage, in particular to a liquid hydrogen storage tank. Background Art

[0002] In the production process of hydrogen low-temperature liquefaction, there are two molecular states in liquid hydrogen, orthohydrogen and parahydrogen. If the insulation effect is not good, the orthohydrogen and parahydrogen components will change. Since there is conversion heat and evaporation heat in the orthohydrogen conversion process, it is necessary to use reasonable technology to quickly extract the heat, thereby ensuring that the orthohydrogen is in a stable state.

[0003] Specifically, liquid orthohydrogen and parahydrogen are stored in a tank. If the liquid hydrogen in the tank is stored for too long, heat leakage will cause some of the orthohydrogen and parahydrogen in the liquid hydrogen to be converted, releasing heat, and forming gaseous hydrogen on the upper part of the tank, thereby causing hydrogen gas-liquid stratification, and then the pressure in the tank will increase, which can easily lead to overpressure accidents.

[0004] In addition, due to the presence of a dead zone at the bottom of the tank during routine operations such as inputting and removing liquid hydrogen, the effective storage volume of the tank will be affected.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome at least some of the shortcomings of the prior art and provide a liquid hydrogen storage tank. By arranging an infusion component on the outer wall of the liquid hydrogen storage tank body that can guide the liquid hydrogen at the lower part of the storage tank body to the upper part, and arranging an ortho-parahydrogen conversion catalyst for converting orthohydrogen into parahydrogen in at least one infusion component, it is beneficial to maintain the balance of ortho-parahydrogen components inside the storage tank body, and guide the heat released by the conversion to the outside of the storage tank body, thereby reducing heat leakage and improving the safety performance of the liquid hydrogen storage tank.

[0007] In order to solve the above technical problems, the present invention provides a liquid hydrogen storage tank, comprising:

[0008] The tank body is used to store liquid hydrogen raw materials;

[0009] The flow guiding device comprises a plurality of infusion assemblies arranged at intervals along the circumference of the storage tank body, wherein the liquid inlet end of the infusion assembly is communicated with the lower part of the storage tank body, and the liquid outlet end of the infusion assembly is connected with the upper part of the storage tank body, and is used to guide the liquid hydrogen raw material at the lower part of the storage tank body to the upper part of the storage tank body, and at least one infusion assembly is provided with an ortho-parahydrogen conversion catalyst for converting orthohydrogen into parahydrogen.

[0010] In some embodiments, each of the infusion components includes a first connecting tube, a second connecting tube, and a delivery tube;

[0011] A plurality of first connecting pipes are installed below the side wall of the storage tank body at intervals along the circumferential direction of the storage tank body and communicated with the interior thereof;

[0012] A plurality of second connecting pipes are installed above the side wall of the storage tank body at intervals along the circumferential direction of the storage tank body and communicated with the interior thereof;

[0013] The plurality of delivery pipes are respectively connected to the plurality of first connecting pipes and the plurality of second connecting pipes in a one-to-one correspondence;

[0014] The ortho-parahydrogen conversion catalyst is filled in the first connecting pipe and / or the second connecting pipe of at least one of the infusion components.

[0015] In some embodiments, each of the delivery tubes includes a suction tube, an infusion tube, and a power unit;

[0016] The liquid suction tube is connected to the first connecting tube, and the liquid infusion tube is connected to the second connecting tube;

[0017] The power unit is arranged between the liquid suction tube and the liquid infusion tube, and is fixedly connected to the side wall of the storage tank body.

[0018] In some embodiments, the second connecting pipe is a bent pipe structure, wherein one end of the second connecting pipe located inside the storage tank body faces the bottom of the storage tank body.

[0019] In some embodiments, the liquid hydrogen storage tank further comprises a stirring device;

[0020] The stirring device comprises a stirring component and a driving unit for driving the stirring component to rotate, the stirring component is located inside the storage tank body, and the driving unit is located outside the storage tank body.

[0021] In some embodiments, the stirring assembly includes a stirring shaft connected to the transmission shaft of the driving unit and at least one impeller disposed on the stirring shaft.

[0022] In some embodiments, an interlayer cavity is provided at the bottom of the storage tank body, and a low-temperature heat exchange device is provided in the interlayer cavity for performing low-temperature heat exchange on the liquid hydrogen raw material stored in the storage tank body.

[0023] In some embodiments, the cryogenic heat exchange device includes at least one group of cryogenic heat exchange coils, and the cryogenic heat exchange coils are filled with one or more of cryogenic helium, cryogenic hydrogen, and cryogenic nitrogen.

[0024] In some embodiments, the liquid hydrogen storage tank further includes a liquid outlet structure;

[0025] The liquid outlet structure includes a liquid outlet pipe and a filter;

[0026] Wherein, the liquid outlet pipe is installed at the lower part of the storage tank body, and a control valve is provided on the liquid outlet pipe;

[0027] The filter comprises a filter tube and a filter net arranged on the filter tube, and the filter tube is detachably connected to the liquid outlet pipe.

[0028] In some embodiments, the liquid hydrogen storage tank further includes a liquid inlet structure;

[0029] The liquid inlet structure comprises a liquid inlet pipe and a sealing cover;

[0030] Wherein, the liquid inlet pipe is installed on the top of the storage tank body, and the sealing cover is detachably sealed and connected to the liquid inlet pipe.

[0031] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0032] (1) The liquid hydrogen storage tank provided by the present invention is advantageous in maintaining the balance of the ortho-parahydrogen components inside the storage tank body, and guiding the heat released by the conversion to the outside of the storage tank body, thereby reducing heat leakage and improving the safety performance of the liquid hydrogen storage tank, by arranging an infusion assembly on the outer wall of the liquid hydrogen storage tank body that can guide the liquid hydrogen at the lower part of the storage tank body to the upper part, and arranging an ortho-parahydrogen conversion catalyst for converting orthohydrogen into parahydrogen in at least one infusion assembly.

[0033] (2) The liquid hydrogen storage tank provided by the present invention facilitates the installation of the normal-para hydrogen conversion catalyst by filling the normal-para hydrogen conversion catalyst into the first connecting pipe and / or the second connecting pipe arranged on the storage tank body.

[0034] (3) The liquid hydrogen storage tank provided by the present invention sets one end of the second connecting pipe located inside the storage tank body toward the bottom of the storage tank body, so that the liquid hydrogen raw material entering the storage tank body through the second connecting pipe flows out vertically downward, thereby preventing the liquid hydrogen raw material from splashing.

[0035] (4) The liquid hydrogen storage tank provided by the present invention can stir the liquid hydrogen raw material stored in the storage tank body by providing a stirring device, and at the same time, in combination with the guide device, the liquid hydrogen raw material at the bottom is transported to the upper end of the storage tank body, thereby preventing excessive heat from being generated due to the conversion of normal secondary liquid hydrogen due to long-term heat leakage of the tank body, reducing the overpressure of the tank body caused by excessive evaporation of gaseous hydrogen from liquid hydrogen, and preventing the formation of dead zone deposition at the bottom of the tank due to excessive storage time of the liquid hydrogen raw material.

[0036] (5) The liquid hydrogen storage tank provided by the present invention improves the heat exchange efficiency by arranging an interlayer cavity at the bottom of the storage tank body, and arranging a low-temperature heat exchange device in the interlayer cavity for performing low-temperature heat exchange on the liquid hydrogen raw material stored in the storage tank body, which is beneficial to maintaining the temperature of the liquid hydrogen raw material and increasing the fluidity, thereby increasing the effective flow volume of the storage tank body.

[0037] (6) The liquid hydrogen storage tank provided by the present invention has a filter detachably connected to the liquid outlet pipe, which is simple and quick to install and disassemble, and is convenient for cleaning and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0039] Figure 1 is a partial structural schematic diagram of a liquid hydrogen storage tank according to an exemplary embodiment of the present invention;

[0040] Figure 2 is another schematic diagram of a partial structure of a liquid hydrogen storage tank according to an exemplary embodiment of the present invention;

[0041] Figure 3 is a schematic structural diagram of a tank body of a liquid hydrogen storage tank according to an exemplary embodiment of the present invention;

[0042] Figure 4 and Figure 5 is a schematic structural diagram of a filter of a liquid hydrogen storage tank according to an exemplary embodiment of the present invention;

[0043] Figure 6 is a schematic structural diagram of a delivery pipe of a liquid hydrogen storage tank according to an exemplary embodiment of the present invention;

[0044] Figure 7 is a schematic structural diagram of a second connecting pipe of a liquid hydrogen storage tank according to an exemplary embodiment of the present invention;

[0045] Figure 8 is a schematic diagram of the internal structure of a liquid hydrogen storage tank according to an exemplary embodiment of the present invention;

[0046] Fig. 9 is a schematic structural diagram of a stirring device for a liquid hydrogen storage tank according to an exemplary embodiment of the present invention;

[0047] Fig.10is a schematic structural diagram of a low-temperature heat exchange device of a liquid hydrogen storage tank according to an exemplary embodiment of the present invention.

[0048] In the figure: 100, liquid hydrogen storage tank;

[0049] 110, storage tank body; 111, tank body; 112, tank cover; 113, interlayer cavity;

[0050] 120. liquid inlet structure; 121. liquid inlet pipe; 122. sealing cover; 123. control handle;

[0051] 130, liquid outlet structure; 131, liquid outlet pipe; 132, filter; 1321, filter pipe; 1322, filter screen; 133, control valve;

[0052] 140, flow guide device; 141, infusion assembly; 142, first connecting pipe; 143, second connecting pipe; 144, delivery pipe; 1441, suction pipe; 1442, infusion pipe; 1443, power unit; 1444, mounting plate; 1445, flange;

[0053] 150, stirring device; 151, stirring assembly; 1511, stirring shaft; 1512, impeller; 15121, collar; 15122, stirring blade; 152, driving unit;

[0054] 160. Low-temperature heat exchange device; 161. Low-temperature heat exchange coil.

[0055] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0057] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 invention.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] As described in the background technology, in the liquid hydrogen storage tanks in the related technology, liquid ortho-parahydrogen is stored in the tank body. If the liquid hydrogen in the tank is stored for too long, heat leakage will cause some of the ortho-hydrogen and para-hydrogen in the liquid hydrogen to be converted and release heat, forming gaseous hydrogen on the tank body, thereby causing hydrogen gas-liquid stratification, and then the pressure in the tank body increases, which can easily lead to overpressure accidents.

[0060] In order to solve the above problems, the present invention provides a liquid hydrogen storage tank, including a storage tank body and a flow guide device, the storage tank body is used to store liquid hydrogen raw materials; the flow guide device includes a plurality of infusion components arranged at intervals along the circumference of the storage tank body, the liquid inlet end of the infusion component is connected to the lower part of the storage tank body, and the liquid outlet end of the infusion component is connected to the upper part of the storage tank body, which is used to guide the liquid hydrogen raw materials at the lower part of the storage tank body to the upper part of the storage tank body, and at least one infusion component is provided with an ortho-parahydrogen conversion catalyst for converting orthohydrogen into parahydrogen. Through the above scheme, it is beneficial to maintain the balance of ortho-parahydrogen components inside the storage tank body, and guide the heat released by the conversion to the outside of the storage tank body, reduce heat leakage, and improve the safety performance of the liquid hydrogen storage tank.

[0061] The preferred technical solution of the liquid hydrogen storage tank of the present invention is described below in conjunction with the accompanying drawings.

[0062] Figure 1 and Figure 2 shows a partial structure of a liquid hydrogen storage tank 100 provided according to an exemplary embodiment of the present invention, Figure 3 The structure of a tank body 111 of a liquid hydrogen storage tank 100 according to an exemplary embodiment of the present invention is shown.

[0063] like Figures 1 to 3 As shown, the liquid hydrogen storage tank 100 includes a tank body 110 for storing liquid hydrogen raw materials and an outer container (not shown) arranged outside the tank body 110, and a vacuum insulation interlayer is formed between the outer container and the tank body 110. In addition, multiple layers of insulation material can also be arranged on the outer wall of the tank body 110 to reduce heat leakage of the tank body 110. It should be pointed out that the liquid hydrogen storage tank 100 provided by the present invention is a large underground storage tank dedicated to liquid hydrogen.

[0064] In some embodiments, the tank body 110 includes a tank body 111 and a tank cover 112 installed on the top of the tank body 111. The tank cover 112 is provided with a liquid inlet structure 120 for injecting liquid hydrogen raw materials into the interior of the tank body 110. The liquid inlet structure 120 includes a liquid inlet pipe 121, a sealing cover 122 and a control handle 123. The liquid inlet pipe 121 is vertically fixedly installed on the tank cover 112 and is connected to the interior of the tank body 111, and the sealing cover 122 is rotatably connected to the upper end opening of the liquid inlet pipe 121, and the control handle 123 is installed on the sealing cover 122.

[0065] It should be noted that when using the liquid inlet structure 120, the sealing cover 122 can be opened by controlling the handle 123, and the liquid hydrogen raw material can be injected into the interior of the tank body 111 from the liquid inlet pipe 121 for storage. After complete injection, the sealing cover 122 is closed to seal the liquid inlet pipe 121.

[0066] In some embodiments, a liquid outlet structure 130 for discharging the liquid hydrogen raw material stored in the tank body 110 is provided at the lower portion of the tank body 111, and the liquid outlet structure 130 includes a liquid outlet pipe 131 and a filter 132; wherein the liquid outlet pipe 131 is installed at the lower portion of the tank body 110, and a control valve 133 is provided on the liquid outlet pipe 131; the filter 132 includes a filter pipe 1321 and a filter screen 1322 provided on the filter pipe 1321, refer to Figure 4 and Figure 5 As shown, the filter tube 1321 is detachably connected to the liquid outlet tube 131, and the installation and disassembly are simple and quick, so it is convenient to clean and replace it.

[0067] It should be noted that when the liquid hydrogen raw material stored in the tank body 111 is needed, the liquid outlet pipe 131 can be opened by the control valve 133, and the liquid hydrogen raw material stored in the tank body 111 can be discharged from the liquid outlet pipe 131 and collected.

[0068] like Figure 4 and Figure 5 As shown, when installing the filter 132, the filter screen 1322 is installed on the end of the filter tube 1321 away from the liquid outlet pipe 131, and the filter tube 1321 is sleeved on the liquid outlet pipe 131 and threadedly connected thereto. It is understood that the filter screen 1322 should be made of a material suitable for use in a low temperature environment.

[0069] Refer again Figure 1 and Figure 2The liquid hydrogen storage tank 100 also includes a guide device 140 located in the vacuum insulation interlayer, and the guide device 140 includes a plurality of infusion components 141 arranged at intervals along the circumference of the storage tank body 110, and the liquid inlet end of the infusion component 141 is connected to the lower part of the storage tank body 110, and the liquid outlet end of the infusion component 141 is connected to the upper part of the storage tank body 110, and is used to guide the liquid hydrogen raw material at the lower part of the storage tank body 110 to the upper part of the storage tank body 110, and at least one infusion component 141 is provided with an ortho-parahydrogen conversion catalyst for converting orthohydrogen into parahydrogen.

[0070] Specifically, after the liquid hydrogen raw material in the storage tank body 110 has been placed for a certain period of time, some heat will inevitably leak in, so low-temperature hydrogen will appear in the upper part of the storage tank body 110, and the low-temperature hydrogen will be converted into a part of liquid hydrogen and a small amount of gaseous hydrogen at about 20K. As the heat leakage continues to be absorbed, a small part of parahydrogen will slowly become orthohydrogen, causing the ratio of parahydrogen to orthohydrogen in the liquid hydrogen raw material in the storage tank body 110 to lose balance, so that the orthohydrogen cannot be guaranteed to be in a stable state. If the orthohydrogen cannot be guaranteed to be in a stable state, that is, when the content of parahydrogen is less than the content of parahydrogen in the equilibrium hydrogen, the orthohydrogen will spontaneously transform into parahydrogen. This transformation is an isomer transformation reaction of two quantum states, which is exothermic. Although this process is slow, the conversion heat is higher than the latent heat of vaporization of liquid hydrogen, which will cause the evaporation of liquid hydrogen, which will undoubtedly cause the gasification of the liquid hydrogen raw material and increase the energy consumption of reliquefaction. In the above scheme of the present invention, an infusion assembly 141 capable of directing the liquid hydrogen from the lower part of the tank body 110 to the upper part is provided on the outer wall of the liquid hydrogen storage tank 100 body, and an ortho-parahydrogen conversion catalyst for converting orthohydrogen into parahydrogen is provided in at least one infusion assembly 141, so that unstable orthohydrogen is converted into parahydrogen in the process of directing the liquid hydrogen from the lower part of the tank body 110 to the upper part, which is beneficial to maintain the ortho-parahydrogen component balance inside the tank body 110 and prevent the orthohydrogen inside the tank body 110 from spontaneously converting into parahydrogen. Moreover, by providing the ortho-parahydrogen conversion catalyst in the infusion assembly 141, the heat released by the conversion can be directed to the outside of the tank body 110, reducing heat leakage and improving the safety performance of the liquid hydrogen storage tank 100.

[0071] In addition, the flow guide device 140 is arranged in the vacuum insulation interlayer, which is beneficial to absorb the heat released by the conversion of orthohydrogen to parahydrogen, and maintain a stable low temperature for the catalytic conversion of orthohydrogen to parahydrogen.

[0072] As an example, the flow guide device 140 includes four to six infusion components 141 evenly spaced along the circumference of the storage tank body 110. Optionally, each of the infusion components 141 includes a first connecting pipe 142, a second connecting pipe 143 and a delivery pipe 144; a plurality of first connecting pipes 142 are installed below the side wall of the storage tank body 110 and communicate with the inside thereof at intervals along the circumference of the storage tank body 110; a plurality of second connecting pipes 143 are installed above the side wall of the storage tank body 110 and communicate with the inside thereof at intervals along the circumference of the storage tank body 110; a plurality of delivery pipes 144 are respectively connected to a plurality of first connecting pipes 142 and a plurality of second connecting pipes 143 in one-to-one correspondence; the ortho-parahydrogen conversion catalyst is filled in the first connecting pipe 142 and / or the second connecting pipe 143 of at least one of the infusion components 141.

[0073] Specifically, a plurality of first connecting tubes 142 are located on the side wall of the storage tank body 110 near the bottom; a plurality of second connecting tubes 143 are located on the side wall of the storage tank body 110 near the top wall, and both are connected to the interior of the storage tank body 110. The ortho-parahydrogen conversion catalyst can be filled in feasible first connecting tubes 142 and second connecting tubes 143 according to actual needs. For example, the ortho-parahydrogen conversion catalyst is filled in the first connecting tube 142 and the second connecting tube 143 of each of the infusion components 141, or the ortho-parahydrogen conversion catalyst can be selectively filled in the first connecting tube 142 and the second connecting tube 143 of several of the infusion components 141, and the ortho-parahydrogen conversion catalyst can also be filled in each or the first connecting tube 142 or the second connecting tube 143 of the infusion components 141.

[0074] In the above scheme, the ortho-para-hydrogen conversion catalyst is filled in the first connecting pipe 142 and / or the second connecting pipe 143 provided on the storage tank body 110, so as to facilitate the installation and replacement of the ortho-para-hydrogen conversion catalyst.

[0075] It should be noted that the catalyst for the conversion of normal and para-hydrogen can be any catalyst commonly used in the art, and the present invention does not limit this. As an example, the normal and para-hydrogen conversion catalyst is a substance formed by sintering at least one non-metallic compound of phosphoric acid, ammonium chloride, ammonium fluoride, and hydrofluoric acid and a metal oxide such as iron, chromium, copper, ruthenium, molybdenum, nickel, or manganese using at least one of molecular sieves, alumina, silicon dioxide, activated carbon, and titanium dioxide as a carrier.

[0076] Figure 6 A partial structure of a delivery pipe 144 of a liquid hydrogen storage tank 100 provided according to an exemplary embodiment of the present invention is shown.

[0077] like Figure 6As shown, each of the delivery tubes 144 includes a suction tube 1441, an infusion tube 1442 and a power unit 1443; the suction tube 1441 is connected to the first connecting tube 142, and the infusion tube 1442 is connected to the second connecting tube 143; the power unit 1443 is arranged between the suction tube 1441 and the infusion tube 1442, and is fixedly connected to the side wall of the storage tank body 110.

[0078] Optionally, the inlet end of the suction pipe 1441 is connected to the first connecting pipe 142 through a flange 1445, and the outlet end of the liquid delivery pipe 1442 is connected to the second connecting pipe 143 through a flange 1445. As an example, the power unit 1443 is a cryogenic submersible pump, the outlet end of the suction pipe 1441 is connected to the inlet of the power unit 1443, and the inlet end of the liquid delivery pipe 1442 is connected to the outlet of the power unit 1443. The power unit 1443 is fixed to the side wall of the storage tank body 110 through the mounting plate 1444, and the power unit 1443 generates suction force on the first connecting pipe 142 through the suction pipe 1441, absorbs the liquid hydrogen raw material at the bottom of the storage tank body 110, and then guides the liquid hydrogen raw material from the second connecting pipe 143 to the upper end of the storage tank body 110 through the liquid delivery pipe 1442. At the same time, the orthohydrogen in the liquid hydrogen raw material is converted into parahydrogen under the catalytic action of the ortho-parahydrogen conversion catalyst.

[0079] Figure 7 A schematic structural diagram of a second connecting pipe 143 of a liquid hydrogen storage tank 100 according to an exemplary embodiment of the present invention is shown.

[0080] like Figure 7 As shown, the second connecting pipe 143 is a curved pipe structure, wherein one end of the second connecting pipe 143 located inside the storage tank body 110 faces the bottom of the storage tank body 110. In this way, the liquid hydrogen raw material entering the storage tank body 110 through the second connecting pipe 143 flows vertically downward to prevent the liquid hydrogen raw material from splashing.

[0081] Figure 8 shows an internal structure of a liquid hydrogen storage tank 100 according to an exemplary embodiment of the present invention; Fig. 9 The structure of a stirring device 150 of a liquid hydrogen storage tank 100 according to an exemplary embodiment of the present invention is shown.

[0082] like Figure 8 and Fig. 9 As shown, the liquid hydrogen storage tank 100 also includes a stirring device 150, which includes a stirring component 151 and a driving unit 152 for driving the stirring component 151 to rotate, the stirring component 151 is located inside the storage tank body 110, and the driving unit 152 is located outside the storage tank body 110.

[0083] Optionally, the stirring assembly 151 includes a stirring shaft 1511 connected to a transmission shaft of the driving unit 152 and at least one impeller 1512 disposed on the stirring shaft 1511 .

[0084] Specifically, the driving unit 152 is fixedly mounted on the tank cover 112, and at least one impeller 1512 is disposed on the stirring shaft 1511 near its lower end, and the impeller 1512 includes a collar 15121 fixedly sleeved on the stirring shaft 1511 and a plurality of stirring blades 15122 arranged around and fixedly mounted on the collar 15121. The transmission shaft of the driving unit 152 drives the stirring shaft 1511 to rotate, thereby driving the stirring blades 15122 on the collar 15121 to stir the liquid hydrogen raw material at the bottom of the tank body 111.

[0085] In detail, as mentioned above, under the influence of heat leakage, the parahydrogen in the storage tank body 110 will slowly turn into orthohydrogen, causing the ratio of parahydrogen to orthohydrogen in the liquid hydrogen raw material in the storage tank body 110 to lose balance, and the liquid hydrogen raw material at a higher liquid level in the storage tank body 110 is affected by heat leakage more than the liquid hydrogen raw material at a lower liquid level. In other words, the imbalance of the ratio of orthohydrogen in the liquid hydrogen raw material at a higher liquid level in the storage tank body 110 is greater than the imbalance of the ratio of orthohydrogen in the liquid hydrogen raw material at a lower liquid level in the storage tank body 110. Based on this, the present invention configures the liquid hydrogen storage tank 100 with a stirring device 150, so that the liquid hydrogen raw material in the storage tank body 110 flows, which helps to convert the orthohydrogen after the endothermic change back to the stable state of parahydrogen.

[0086] In the above scheme, by setting up the stirring device 150, the liquid hydrogen raw material stored in the storage tank body 110 can be stirred, and at the same time, the liquid hydrogen raw material at the bottom is transported to the upper end of the storage tank body 110 in combination with the guide device 140, so as to prevent excessive heat from being generated due to the conversion of normal liquid hydrogen due to long-term heat leakage of the tank body 111, reduce the evaporation of excessive gaseous hydrogen from liquid hydrogen and generate overpressure in the tank body 111, and also prevent the liquid hydrogen raw material from being stored for too long and forming dead zone deposition at the bottom of the tank.

[0087] It should be noted that the impeller 1512 and the stirring shaft 1511 need to be made of materials suitable for use in low temperature environments.

[0088] In some embodiments, an interlayer cavity 113 is provided at the bottom of the storage tank body 110, and a low-temperature heat exchange device 160 is provided in the interlayer cavity 113 for low-temperature heat exchange of the liquid hydrogen raw material stored in the storage tank body 110. This can improve the heat exchange efficiency, help maintain the temperature of the liquid hydrogen raw material and increase fluidity, thereby increasing the effective flow volume of the storage tank body 110.

[0089] Fig.10 The structure of a low-temperature heat exchange device 160 of a liquid hydrogen storage tank 100 according to an exemplary embodiment of the present invention is shown.

[0090] like Fig.10 As shown, the cryogenic heat exchange device 160 includes at least one group of cryogenic heat exchange coils 161, and the cryogenic heat exchange coils 161 are filled with one or more of cryogenic helium, cryogenic hydrogen, and cryogenic nitrogen.

[0091] It should be noted that the low-temperature heat exchange coil 161 is also connected to a heat exchange medium source for supplying low-temperature heat exchange medium thereto. When the temperature of the low-temperature medium such as low-temperature helium, low-temperature hydrogen or low-temperature nitrogen in the low-temperature heat exchange coil 161 does not meet the conditions for maintaining the temperature of the liquid hydrogen raw material, the low-temperature medium in the low-temperature heat exchange coil 161 should be updated in time.

[0092] Refer to the following Figures 1 to 10 The working process of the liquid hydrogen storage tank 100 provided in the exemplary embodiment of the present invention is described.

[0093] a. First, the storage tank body 110 is installed and fixed. After the storage tank body 110 is installed and fixed, the sealing cover 122 can be opened by controlling the handle 123, and the liquid hydrogen raw material is injected into the storage tank body 110 from the liquid inlet pipe 121 for storage. After the injection is complete, the sealing cover 122 is closed to seal the liquid inlet pipe 121 and store the liquid hydrogen raw material;

[0094] b. The driving unit 152 drives the stirring shaft 1511 to rotate, thereby driving the stirring blades 15122 on the collar 15121 to stir the liquid hydrogen raw material at the bottom of the storage tank body 110. The power unit 1443 is fixed to the side wall of the tank body 111 through the mounting plate 1444. The power unit 1443 generates suction force on the first connecting pipe 142 through the liquid inlet pipe 121 to absorb the liquid hydrogen raw material at the bottom of the storage tank body 110, and then discharges the liquid hydrogen raw material at the bottom from the second connecting pipe 143 to the upper end of the storage tank body 110 through the liquid infusion pipe 1442. The main purpose is to stir the liquid hydrogen raw material stored for a long time inside the storage tank body 110. At the same time, the orthohydrogen in the liquid hydrogen raw material is converted into parahydrogen under the catalytic action of the ortho-parahydrogen conversion catalyst to maintain the ortho-parahydrogen component balance inside the storage tank body 110.

[0095] c. The low-temperature heat exchange coil 161 located in the bottom interlayer cavity of the storage tank body 110 heats the bottom of the storage tank body 110 through built-in low-temperature helium heat exchange, so as to maintain the temperature of the liquid hydrogen and increase the fluidity;

[0096] d. When the liquid hydrogen raw material stored in the storage tank body 110 needs to be used, the liquid outlet pipe 131 can be opened through the control valve 133, and the liquid hydrogen raw material stored in the storage tank body 110 is discharged from the liquid outlet pipe 131 and collected.

[0097] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the present invention can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A liquid hydrogen storage tank, characterized in that: include: The tank body is used to store liquid hydrogen raw materials; The flow guiding device comprises a plurality of infusion assemblies arranged at intervals along the circumference of the storage tank body, wherein the liquid inlet end of the infusion assembly is communicated with the lower part of the storage tank body, and the liquid outlet end of the infusion assembly is connected with the upper part of the storage tank body, and is used to guide the liquid hydrogen raw material at the lower part of the storage tank body to the upper part of the storage tank body, and at least one infusion assembly is provided with an ortho-parahydrogen conversion catalyst for converting orthohydrogen into parahydrogen.

2. The liquid hydrogen storage tank according to claim 1, characterized in that: Each of the infusion components includes a first connecting pipe, a second connecting pipe and a delivery tube; A plurality of first connecting pipes are installed below the side wall of the storage tank body at intervals along the circumferential direction of the storage tank body and communicated with the interior thereof; A plurality of second connecting pipes are installed above the side wall of the storage tank body at intervals along the circumferential direction of the storage tank body and communicated with the interior thereof; The plurality of delivery pipes are respectively connected to the plurality of first connecting pipes and the plurality of second connecting pipes in a one-to-one correspondence; The ortho-parahydrogen conversion catalyst is filled in the first connecting pipe and / or the second connecting pipe of at least one of the infusion components.

3. The liquid hydrogen storage tank according to claim 2, characterized in that: Each of the delivery tubes comprises a suction tube, a liquid infusion tube and a power unit; The liquid suction tube is connected to the first connecting tube, and the liquid infusion tube is connected to the second connecting tube; The power unit is arranged between the liquid suction tube and the liquid infusion tube, and is fixedly connected to the side wall of the storage tank body.

4. The liquid hydrogen storage tank according to claim 2, characterized in that: The second connecting pipe is a bent pipe structure, wherein one end of the second connecting pipe located inside the storage tank body faces the bottom of the storage tank body.

5. The liquid hydrogen storage tank according to any one of claims 1 to 4, characterized in that: Also includes a stirring device; The stirring device comprises a stirring component and a driving unit for driving the stirring component to rotate, the stirring component is located inside the storage tank body, and the driving unit is located outside the storage tank body.

6. The liquid hydrogen storage tank according to claim 5, characterized in that: The stirring assembly comprises a stirring shaft connected to the transmission shaft of the driving unit and at least one impeller arranged on the stirring shaft.

7. The liquid hydrogen storage tank according to claim 5, characterized in that: An interlayer cavity is provided at the bottom of the storage tank body, and a low-temperature heat exchange device is provided in the interlayer cavity for performing low-temperature heat exchange on the liquid hydrogen raw material stored in the storage tank body.

8. The liquid hydrogen storage tank according to claim 7, characterized in that: The low-temperature heat exchange device includes at least one group of low-temperature heat exchange coils, and the low-temperature heat exchange coils are filled with one or more of low-temperature helium, low-temperature hydrogen, and low-temperature nitrogen.

9. The liquid hydrogen storage tank according to any one of claims 1 to 4, characterized in that: Also includes a liquid outlet structure; The liquid outlet structure includes a liquid outlet pipe and a filter; Wherein, the liquid outlet pipe is installed at the lower part of the storage tank body, and a control valve is provided on the liquid outlet pipe; The filter comprises a filter tube and a filter net arranged on the filter tube, and the filter tube is detachably connected to the liquid outlet pipe.

10. The liquid hydrogen storage tank according to any one of claims 1 to 4, characterized in that: Also includes a liquid inlet structure; The liquid inlet structure comprises a liquid inlet pipe and a sealing cover; Wherein, the liquid inlet pipe is installed on the top of the storage tank body, and the sealing cover is detachably sealed and connected to the liquid inlet pipe.

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