Nitrogen charging and emptying vertical pipe of hydrogen refueling station

Abstract

The utility model provides a hydrogen refueling station nitrogen charging and emptying vertical pipe. The hydrogen refueling station nitrogen charging and emptying vertical pipe comprises an emptying vertical pipe body, an emptying header pipe and a nitrogen charging pipeline, the emptying vertical pipe body is vertically arranged; the emptying main pipe is communicated with the emptying vertical pipe body and is used for inputting hydrogen into the emptying vertical pipe body; and the nitrogen charging pipeline is communicated with the emptying vertical pipe body and is used for inputting nitrogen into the emptying vertical pipe body. According to the emptying vertical pipe of the hydrogen refueling station, when the hydrogen refueling station is overhauled, it is determined that hydrogen reserves are large, and manual emptying is needed, a large amount of nitrogen can be filled into the emptying vertical pipe body through the nitrogen filling pipeline, and therefore the air concentration in the emptying vertical pipe body is reduced; and dangerous accidents caused by combustion of a large amount of hydrogen released by the emptying main pipe and oxygen in the emptying vertical pipe body are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of vent risers, and more specifically, to a nitrogen filling and vent riser for a hydrogen filling station. Background Art

[0002] The minimum ignition energy of hydrogen is very low, and its ignition energy in normal air is 0.019 millijoules. The combustion range of hydrogen is very wide, and its explosion limit is 4% - 75% (volume fraction), making it easy to form an explosive mixture. When hydrogen burns in air, the flame is blue and not easily detectable.

[0003] In the prior art, when a large amount of hydrogen is found during the maintenance of a hydrogen filling station, a large amount of hydrogen will be vented. However, due to the above characteristics of hydrogen, the electrostatic friction between it and the pipeline is very likely to reach the minimum ignition energy of hydrogen, thus causing hydrogen combustion, which is difficult to detect, and ultimately leading to dangerous accidents during the large-scale venting of hydrogen. Therefore, there is an urgent need for a measure to avoid accidents at present. Summary of the Utility Model

[0004] To solve the above problems, the purpose of the embodiments of the present utility model is to provide a nitrogen filling and vent riser for a hydrogen filling station.

[0005] The embodiments of the present utility model provide a nitrogen filling and vent riser for a hydrogen filling station, including a vent riser body, a vent main pipe, and a nitrogen filling pipeline; the vent riser body is vertically arranged; the vent main pipe is connected to the vent riser body and is used to input hydrogen into the vent riser body; the nitrogen filling pipeline is connected to the vent riser body and is used to input nitrogen into the vent riser body.

[0006] Optionally, the number of vent main pipes is multiple, and the pressure grades of the multiple vent main pipes are different.

[0007] Optionally, the diameter of the vent main pipe is DN50.

[0008] Optionally, the diameter of the nitrogen filling pipeline is DN15.

[0009] Optionally, the nitrogen filling pipeline includes: a ball valve.

[0010] Optionally, the nitrogen filling pipeline further includes: a check valve.

[0011] Optionally, the diameters of the ball valve and the check valve are both DN15.

[0012] Optionally, the vent riser for the hydrogen filling station further includes: a drain valve.

[0013] Optionally, the vent riser for the hydrogen filling station further includes: a flame arrester.

[0014] Optionally, the vent riser for the hydrogen filling station further includes: a drain hole.

[0015] The solution provided in the above embodiment of the utility model has a simple structure. It only needs to install a nitrogen charging pipeline on the main body of the vent riser, and introduce nitrogen into the vent riser of the hydrogen refueling station to avoid dangerous accidents caused by combustion when a large amount of hydrogen is vented. That is, when it is determined during the maintenance of the hydrogen refueling station that the hydrogen storage is large and manual venting is required, a large amount of nitrogen can be filled into the main body of the vent riser through the nitrogen charging pipeline, thereby reducing the air concentration in the main body of the vent riser and preventing dangerous accidents caused by the combustion of a large amount of hydrogen released through the main vent pipe and the oxygen in the main body of the vent riser.

[0016] To make the above objects, features, and advantages of the utility model more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Shows a specific structural schematic diagram of a nitrogen-charged vent riser for a hydrogen refueling station provided by an embodiment of the present utility model.

[0019] Icon:

[0020] 1 - Main body of the vent riser, 2 - Main vent pipe, 3 - Nitrogen charging pipeline, 4 - Drain valve, 5 - Flame arrester, 6 - Drain hole, 31 - Ball valve, 32 - Water stop valve. Specific Embodiments

[0021] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0022] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0023] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] An embodiment of the present utility model provides a hydrogenation station nitrogen filling and venting riser pipe, as Figure 1 shown Figure 1 which shows a schematic structural diagram thereof. The hydrogenation station venting riser pipe includes: a venting riser pipe body 1, a venting main pipe 2, and a nitrogen filling pipe 3. Among them, the venting riser pipe body 1 is vertically arranged. For example, it can be arranged perpendicular to the ground, and the embodiment of the present utility model does not limit this. And, the diameter of the venting riser pipe body 1 can be set according to actual requirements. In the embodiment of the present utility model, the diameter of the venting riser pipe body 1 can be set to DN100. Further, the venting main pipe 2 is communicated with the venting riser pipe body 1 and is used to input hydrogen into the venting riser pipe body 1. For example, the other end of the venting main pipe 2 (the end not communicated with the venting riser pipe body 1) can be communicated with the equipment in the hydrogenation station that releases hydrogen. Optionally, there are a plurality of venting main pipes 2, and the pressure grades of the plurality of venting main pipes 2 are different. For example, two venting main pipes 2 with different pressure grades can be set. In the embodiment of the present utility model, the diameter of the venting main pipe 2 can be set according to actual requirements. Optionally, the diameter of the venting main pipe 2 can be DN50. The nitrogen filling pipe 3 is communicated with the venting riser pipe body 1 and is used to input nitrogen into the venting riser pipe body 1. For example, a nitrogen cylinder in the station can be externally connected to the nitrogen filling pipe 3 as the source of nitrogen. In the embodiment of the present utility model, the diameter of the nitrogen filling pipe 3 can be set according to actual requirements. Optionally, the diameter of the nitrogen filling pipe 3 can be DN15. It should be noted that the embodiment of the present utility model does not specifically limit the specific positions and elevations where the venting main pipe 2 and the nitrogen filling pipe 3 are connected to the venting riser pipe body 1, and it can be based on the actual process pipeline layout diagram, as Figure 1As shown in the figure, the connection position of the nitrogen filling pipeline 3 can be a position close to the bottom of the vent riser body 1, and the connection position of the main vent pipeline 2 to the vent riser body 1 can be higher than the connection position of the nitrogen filling pipeline 3 to the vent riser body 1.

[0025] The structure of the embodiment of the utility model is simple. Only by installing the nitrogen filling pipeline 3 on the vent riser body 1 and introducing nitrogen into the vent riser of the hydrogen filling station can the dangerous accident caused by the combustion when a large amount of hydrogen is vented be avoided. Specifically, when it is determined during the maintenance of the hydrogen filling station that the hydrogen storage is large and manual venting is required, a large amount of nitrogen can be filled into the vent riser body 1 through the nitrogen filling pipeline 3, thereby reducing the air concentration in the vent riser body 1 and preventing the dangerous accident caused by the combustion of a large amount of hydrogen released through the main vent pipeline 2 and the oxygen in the vent riser body 1.

[0026] Optionally, the nitrogen filling pipeline 3 includes: a ball valve 31, that is, the ball valve 31 is arranged on the nitrogen filling pipeline 3. By controlling the opening and closing of the ball valve 31, the on-off control of the nitrogen filling pipeline 3 is realized, and further the input of nitrogen into the vent riser body 1 is controlled. The ball valve 31 not only has a simple structure, relatively small volume, light weight and is convenient for maintenance, but also has high tightness and is not easily eroded by the medium.

[0027] Optionally, as Figure 1 shown, the nitrogen filling pipeline 3 may further include: a check valve 32. For example, a ball valve 31 and a check valve 32 are simultaneously arranged at the inlet where the nitrogen filling pipeline 3 is connected to the vent riser body 1, and the check valve 32 is arranged in the gas output direction of the ball valve 31, that is, the installation position of the check valve 32 is closer to the vent riser body 1, so as to further effectively control the one-way flow of nitrogen, prevent backflow and improve safety.

[0028] Optionally, the diameters of the ball valve 31 and the check valve 32 can both be DN15 to match the diameter of the nitrogen filling pipeline 3.

[0029] Optionally, as Figure 1 shown, the vent riser of the hydrogen filling station may further include: a drain valve 4. The installation position of the drain valve 4 can be on the drain pipeline connected to the bottom of the vent riser body 1, and the diameter of the drain valve 4 can be adapted to the diameter of the drain pipeline, both being DN25.

[0030] Optionally, as Figure 1 shown, the vent riser of the hydrogen filling station may further include: a flame arrester 5. The installation position of the flame arrester 5 can be at a position close to the top of the vent riser body 1 to further avoid the fire caused by hydrogen and improve the safety of the overall structure. Among them, the diameter of the flame arrester 5 can be the same as the diameter of the vent riser body 1, both being DN100.

[0031] Optionally, as Figure 1As shown, the vent riser of the hydrogen refueling station may further include: a water drainage hole 6. The number of the water drainage holes 6 may be multiple, and they are arranged at the top of the vent riser body 1, and their diameter may be 5 mm, so as to prevent water flow from flowing into the vent riser body 1 and further ensure the overall safety of the vent riser of the hydrogen refueling station.

[0032] As described above, the above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of technical solutions of changes or substitutions, and all of them should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A nitrogen filling and venting riser pipe for a hydrogen refueling station, characterized in that, Including: The vent riser main body (1), the vent main pipe (2) and the nitrogen filling pipe (3); The vent riser main body (1) is arranged vertically; The vent main pipe (2) is communicated with the vent riser main body (1) and is used for inputting hydrogen into the vent riser main body (1); The nitrogen filling pipe (3) is communicated with the vent riser main body (1) and is used for inputting nitrogen into the vent riser main body (1); The access position of the nitrogen filling pipe (3) is close to the bottom of the vent riser main body (1), and the access position of the vent main pipe (2) to the vent riser main body (1) is higher than the access position of the nitrogen filling pipe (3) to the vent riser main body (1).

2. The nitrogen charging and venting riser of the hydrogen refueling station according to claim 1, characterized in that, The number of the vent main pipes (2) is multiple, and the pressure grades of the multiple vent main pipes (2) are different.

3. The nitrogen filling and venting riser pipe of the hydrogen refueling station according to claim 1, characterized in that The diameter of the vent main pipe (2) is DN50.

4. The nitrogen filling and venting riser pipe of the hydrogen refueling station according to claim 1, characterized in that, The diameter of the nitrogen filling pipe (3) is DN15.

5. The nitrogen charging and venting riser of the hydrogen refueling station according to claim 1, wherein The nitrogen filling pipe (3) includes: a ball valve (31).

6. The nitrogen filling and venting riser of the hydrogen refueling station according to claim 5, wherein, The nitrogen filling pipe (3) further includes: a check valve (32).

7. The nitrogen charging and venting riser of the hydrogen refueling station according to claim 6, characterized in that, The diameters of the ball valve (31) and the check valve (32) are both DN15.

8. The nitrogen filling and venting riser of the hydrogen refueling station according to claim 1, characterized in that, It further includes: A drain valve (4).

9. The nitrogen charging and venting riser pipe of the hydrogen refueling station according to claim 1, characterized in that, It further includes: A flame arrester (5).

10. The nitrogen filling and venting riser pipe of the hydrogen refueling station according to claim 1, characterized in that, It further includes: A water falling hole (6).

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