A liquid hydrogen storage and supply system with a valve box

Abstract

The application provides a liquid hydrogen storage and supply system with a valve box, and belongs to the technical field of liquid hydrogen fuel cells.The liquid hydrogen storage and supply system comprises a liquid hydrogen bottle, an internal storage space of the liquid hydrogen bottle being used for storing liquid hydrogen, a valve box, an internal placement space of the valve box being used for placing a delivery pipeline and a valve, the placement space being a vacuum environment, and the storage space and the placement space being communicated through a connecting heat pipe.The liquid hydrogen storage and supply system with the valve box sets the placement space of the valve box as a vacuum environment, so that the internal delivery pipeline and the valve can be simplified as a single-wall structure, the complex layout of a plurality of vacuum pipes and vacuum stop valves is replaced, and the liquid hydrogen delivery process on an automobile is more suitable;the liquid hydrogen storage and supply system meets the requirements of a small space of a whole vehicle, and solves the problems of frost formation of liquid air and a pipe wall caused by the liquid hydrogen pipeline and easy jamming of a low-temperature valve in a deep cooling environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of liquid hydrogen fuel cell technology, in particular to a liquid hydrogen storage and supply system with a valve box. BACKGROUND

[0002] Fuel cells are applied in automobiles, which have the advantages of energy saving and environmental protection, and have rapidly developed in recent years and have good application prospects.

[0003] At present, the hydrogen storage and supply system of the vehicle-mounted fuel cell mainly uses 35MPa high-pressure gaseous hydrogen storage. Since the hydrogen density of the high-pressure gaseous hydrogen storage is not greater than 4%, the hydrogen storage capacity of each cylinder is small. When it is needed to be used in heavy vehicles, the number of required cylinders is huge, which cannot be arranged on the vehicle, and thus cannot meet the requirements of the vehicle.

[0004] Therefore, the liquid hydrogen cylinder for fuel cell vehicles is one of the technical paths for improving the driving range of medium and heavy vehicles. Since liquid hydrogen evaporates easily, the cold insulation performance of the pipeline for transporting liquid hydrogen from the liquid hydrogen cylinder to the fuel cell is very important. However, the existing natural gas delivery structure cannot meet the cold insulation requirements of liquid hydrogen, and liquid emptying and icing phenomena may occur. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the defects of the existing liquefied natural gas pipe.

[0006] The liquid hydrogen storage and supply system with a valve box cannot meet the cold insulation requirements of liquid hydrogen, and thus provides a liquid hydrogen storage and supply system with a valve box.

[0007] At the same time, in order to solve the problem that the traditional liquid hydrogen delivery needs to use double-layer vacuum pipelines and vacuum valves in each passage, which occupies a large space and cannot meet the layout of the fuel cell vehicle.

[0008] In order to solve the above technical problems, the present application provides a liquid hydrogen storage and supply system with a valve box, which comprises:

[0009] The liquid hydrogen cylinder has a storage space inside for storing liquid hydrogen;

[0010] The valve box has a placement space inside for placing the delivery pipeline and the valve; the placement space is a vacuum environment; the storage space and the placement space are communicated through a connecting heat conducting pipe.

[0011] As a preferred scheme, the delivery pipeline comprises:

[0012] The liquid inlet pipeline has an inlet end and an outlet end; the inlet end of the liquid inlet pipeline is adapted to be connected with a hydrogen filling gun of a hydrogen filling station; the outlet end of the liquid inlet pipeline is communicated with the first connecting heat conducting pipe through a three-way valve; a first stop valve is arranged on the liquid inlet pipeline;

[0013] The liquid supply pipeline has an inlet end and an outlet end; the outlet end of the liquid supply pipeline is suitable for fuel cell connection; the inlet end of the liquid supply pipeline is communicated with one end of the first connecting heat pipe through a three-way valve; the other end of the first connecting heat pipe extends into the liquid hydrogen bottle; a second stop valve is arranged on the liquid supply pipeline.

[0014] As a preferred solution, the delivery pipeline further comprises:

[0015] The booster pipeline has one end extending to the outside of the valve box and being suitable for connecting with booster liquid, and the other end being communicated with one end of the second connecting heat pipe; the other end of the second connecting heat pipe extends into the liquid hydrogen bottle; a third stop valve is arranged on the booster pipeline.

[0016] As a preferred solution, further comprising:

[0017] The purge pipeline has one end communicated with the liquid inlet pipeline and the liquid supply pipeline, and the other end extending to the outside of the valve box and being suitable for being communicated with purge gas; an adjusting valve is arranged on the purge pipeline.

[0018] As a preferred solution, a filter is arranged on the liquid inlet pipeline.

[0019] As a preferred solution, the connecting heat pipe is a multilayer thin-wall stainless steel pipe.

[0020] As a preferred solution, the liquid inlet pipeline and the liquid supply pipeline are both wound with radiation-proof aluminum foil material.

[0021] As a preferred solution, a gas seal structure is arranged at the connection between the valve box and the booster pipeline.

[0022] As a preferred solution, the inlet end of the liquid inlet pipeline is provided with a liquid hydrogen hydrogenation seat.

[0023] As a preferred solution, the valve box is a vacuum multilayer heat insulation container.

[0024] The technical solution of the present application has the following advantages:

[0025] 1. The liquid hydrogen storage and supply system with a valve box provided by the present application comprises a liquid hydrogen bottle and a valve box; the placement space of the valve box is arranged as a vacuum environment; thus, the internal delivery pipeline and valves can be simplified as a single-wall structure, replacing the complex layout of multiple vacuum pipes and vacuum stop valves, and being more suitable for the delivery process of liquid hydrogen on a vehicle.

[0026] 2. The liquid hydrogen storage and supply system with a valve box provided by the present application, the storage space of the liquid hydrogen bottle is communicated with the placing space of the valve box through a connecting heat conduction pipe; the connecting heat conduction pipe is a multilayer thin-walled stainless steel pipe, which is integrally formed, increases the heat conduction length and realizes low-temperature compensation by using a flexible structure, and has the characteristics of high reliability and small risk of internal leakage compared with the traditional corrugated pipe structure.

[0027] 3. The liquid hydrogen storage and supply system with a valve box provided by the present application, the liquid inlet pipeline and the liquid outlet pipeline are both wound with radiation-proof aluminum foil material, so that the heat radiation is minimized.

[0028] 4. The liquid hydrogen storage and supply system with a valve box provided by the present application, the valve box is a vacuum multilayer heat insulation container, which improves the heat insulation performance, seals the vacuum degree and ensures the minimum heat leakage. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the liquid hydrogen storage and supply system with a valve box of the present application.

[0031] Figure 2 It is a first angle structure schematic diagram of the delivery pipeline of the liquid hydrogen storage and supply system with a valve box of the present application.

[0032] Figure 3 It is a second angle structure schematic diagram of the delivery pipeline of the liquid hydrogen storage and supply system with a valve box of the present application.

[0033] Figure 4 It is a third angle structure schematic diagram of the delivery pipeline of the liquid hydrogen storage and supply system with a valve box of the present application.

[0034] Explanation of reference signs:

[0035] 1, liquid hydrogen bottle; 2, valve box; 3, liquid inlet pipeline; 4, first stop valve; 5, regulating valve; 6, liquid hydrogen hydrogenation seat; 7, first connecting heat conduction pipe; 8, liquid supply pipeline; 9, second stop valve; 10, pressure boosting pipeline; 11, second connecting heat conduction pipe; 12, third stop valve; 13, purging pipeline. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] This invention provides a liquid hydrogen storage and supply system with a valve box, such as... Figure 1 As shown, it includes: a liquid hydrogen cylinder 1 and a valve box 2 connected to the liquid hydrogen cylinder 1 via a heat-conducting pipe;

[0041] The liquid hydrogen cylinder 1 is installed on the chassis of the fuel cell vehicle; the interior of the liquid hydrogen cylinder 1 has a storage space for storing liquid hydrogen; a valve box 2 is provided on one side of the liquid hydrogen cylinder 1, the valve box 2 has a placement space for placing the liquid hydrogen delivery pipeline and the valves on the delivery pipeline; the placement space is a high vacuum environment, so the delivery pipeline and valves set inside the placement space can adopt a single-wall structure, without the need for the complex layout of vacuum tubes and vacuum shut-off valves.

[0042] The valve box 2 adopts a cylindrical structure and a horizontal installation structure. This shape and placement method match the liquid hydrogen cylinder 1, greatly reducing the volume occupied and achieving the optimal hydrogen storage volume density of the vehicle-mounted liquid hydrogen cylinder 1.

[0043] like Figure 2As shown, liquid hydrogen is delivered into the liquid hydrogen bottle 1 for storage through the liquid inlet pipeline 3, which has an inlet end and an outlet end; the inlet end of the liquid inlet pipeline 3 is located outside the valve box 2, and a liquid hydrogen filling seat 6 is arranged at the inlet end; the outlet end of the liquid inlet pipeline 3 is communicated with one end of the first connecting heat pipe 7 through a three-way valve; the other end of the first connecting heat pipe 7 extends into the liquid hydrogen bottle 1; meanwhile, a first stop valve 4 is arranged on the liquid inlet pipeline 3, and the valve of the first stop valve 4 is arranged outside the valve box 2. Meanwhile, a filter is arranged on the liquid inlet pipeline 3.

[0044] Liquid hydrogen in the liquid hydrogen bottle 1 is delivered into the fuel cell through the liquid supply pipeline 8, which has an inlet end and an outlet end; the inlet end of the liquid supply pipeline 8 is communicated with one end of the first connecting heat pipe 7 through a three-way valve, and the outlet end of the liquid supply pipeline 8 is arranged outside the valve box 2 and connected with the fuel cell; a second stop valve 9 is arranged on the liquid supply pipeline 8, and the valve of the second stop valve 9 is arranged outside the valve box 2.

[0045] During the liquid hydrogen filling process, the first stop valve 4 is opened, the second stop valve 9 is closed, the hydrogen filling station hydrogen filling gun is connected with the liquid hydrogen filling seat 6, and the liquid hydrogen enters the liquid hydrogen bottle 1 for storage through the liquid inlet pipeline 3 and the first connecting heat pipe 7; when the liquid hydrogen needs to be supplied to the fuel cell, the first stop valve 4 is closed, the second stop valve 9 is opened, and the liquid hydrogen enters the liquid supply pipeline 8 through the first connecting heat pipe 7 and enters the fuel cell.

[0046] As shown in Figure 3 , 4 As shown, a pressurizing pipeline 10 is further arranged on the liquid hydrogen bottle 1; one end of the pressurizing pipeline 10 is arranged outside the valve box 2 and is adapted to be connected with pressurizing liquid, and the other end is communicated with the second connecting heat pipe 11; the second connecting heat pipe 11 extends into the liquid hydrogen bottle 1; a third stop valve 12 is arranged on the pressurizing pipeline 10, and the valve of the third stop valve 12 is arranged outside the valve box 2. A gas seal structure is arranged at the connection between the valve box 2 and the pressurizing pipeline 10 to ensure the sealing property of the connection.

[0047] When the pressure in the liquid hydrogen bottle 1 is lower than the design value, the third stop valve 12 is opened, and the pressurizing liquid is delivered into the liquid hydrogen bottle 1 through the pressurizing pipeline 10 and the second connecting heat pipe 11 to realize the pressurization of the liquid hydrogen bottle 1.

[0048] In order to ensure the purity of the gas in the liquid inlet pipeline 3 and the liquid supply pipeline 8, the interior of the pipeline needs to be purged with purge gas, so a purge pipeline 13 is arranged; one end of the purge pipeline 13 is communicated with the part of the liquid inlet pipeline 3 and the liquid supply pipeline 8, and the other end extends to the outside of the valve box 2; an adjusting valve 5 is arranged on the purge pipeline 13; in this scheme, the purge gas is nitrogen.

[0049] Further, the first connecting heat conduction pipe 7 and the second connecting heat conduction pipe 11 are both multi-layer thin-wall stainless steel pipes, which are integrally formed, increase the heat conduction length and realize low-temperature compensation by using flexible structure, have the characteristics of high reliability and small risk of internal leakage, compared with the traditional corrugated pipe structure.

[0050] Further, the liquid inlet pipeline 3 and the liquid outlet pipeline are both wound with radiation-proof aluminum foil material, so that the heat radiation is reduced to the minimum.

[0051] Further, the valve box 2 is a vacuum multi-layer heat insulation container, which improves the heat insulation performance of the valve box 2 and reduces the heat conduction coefficient.

[0052] The liquid hydrogen storage and supply system with a valve box in the scheme integrates the valve box 2 and the liquid hydrogen bottle 1 together, realizes the delivery process of the liquid hydrogen bottle 1 to the fuel cell, has good cold insulation performance, meets the requirements of the narrow space of the whole vehicle, and solves the problems of frost formation of liquid air and pipe wall caused by the liquid hydrogen pipeline and the easy jamming of low-temperature valves in a deep cold environment.

[0053] Obviously, the above embodiments are only examples for clearly illustrating, but not limitation on the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A liquid hydrogen storage and supply system with a valve box, characterized by, The utility model relates to a liquid hydrogen filling device, comprising: a liquid hydrogen bottle (1) having a storage space for storing liquid hydrogen inside; a valve box (2) having a placing space for placing a delivery pipeline and a valve inside; the placing space is a vacuum environment; the storage space and the placing space are communicated through a connecting heat pipe; the delivery pipeline comprises: a liquid inlet pipeline (3) having an inlet end and an outlet end; the inlet end of the liquid inlet pipeline (3) is adapted to be connected with a hydrogen filling gun of a hydrogen filling station; the outlet end of the liquid inlet pipeline (3) is communicated with one end of a first connecting heat pipe (7) through a three-way valve; a first stop valve (4) is arranged on the liquid inlet pipeline (3); a liquid supply pipeline (8) having an inlet end and an outlet end; the outlet end of the liquid supply pipeline (8) is adapted to be connected with a fuel cell; the inlet end of the liquid supply pipeline (8) is communicated with the other end of the first connecting heat pipe (7) through a three-way valve; the other end of the first connecting heat pipe (7) extends into the liquid hydrogen bottle (1); a second stop valve (9) is arranged on the liquid supply pipeline (8); during liquid hydrogen filling, the first stop valve (4) is opened, the second stop valve (9) is closed, the hydrogen filling gun of the hydrogen filling station is connected with a liquid hydrogen filling seat (6), and liquid hydrogen enters the liquid hydrogen bottle (1) through the liquid inlet pipeline (3) and the first connecting heat pipe (7) to be stored; when liquid hydrogen needs to be supplied to the fuel cell, the first stop valve (4) is closed, and the second stop valve (9) is opened, so that liquid hydrogen enters the liquid supply pipeline (8) through the first connecting heat pipe (7) and enters the fuel cell; the utility model further comprises: a purging pipeline (13) having one end communicated with the liquid inlet pipeline (3) and the liquid supply pipeline (8) and the other end extending to the outside of the valve box (2) and adapted to be communicated with purging gas; an adjusting valve (5) is arranged on the purging pipeline (13), and the purging gas is nitrogen; the connecting heat pipe is a multilayer thin-walled stainless steel pipe; the liquid inlet pipeline (3) and the liquid supply pipeline (8) are both wound with a radiation-proof aluminum foil material; the valve box (2) is a vacuum multilayer heat-insulating container.

2. The liquid hydrogen storage and supply system with a valve box according to claim 1, characterized by, the delivery pipeline further comprises: a pressurizing pipeline (10) having one end extending to the outside of the valve box (2) and adapted to be connected with pressurizing liquid and the other end communicated with one end of a second connecting heat pipe (11); the other end of the second connecting heat pipe (11) extends into the liquid hydrogen bottle (1); a third stop valve (12) is arranged on the pressurizing pipeline (10).

3. The liquid hydrogen storage and supply system with a valve box according to claim 1, wherein a filter is arranged on the liquid inlet pipeline (3).

4. The liquid hydrogen storage and supply system with a valve box according to claim 2, wherein an air seal structure is arranged at the connection between the valve box (2) and the pressurizing pipeline (10).

5. The liquid hydrogen storage and supply system with a valve box according to claim 1, wherein the inlet end of the liquid inlet pipeline (3) is provided with a liquid hydrogen filling seat (6).

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