High-pressure hydrogen sampling device

Abstract

The utility model discloses a high-pressure hydrogen sampling device, which can be used for connecting a hydrogenation gun, a hydrogen storage tank or a transportation tank car of a hydrogen refueling station, and at least comprises a high-pressure pipeline which comprises three branch pipelines, and each branch pipeline is respectively provided with a first sampling inlet, a second sampling inlet, a purging gas interface and a high-pressure ball valve and a one-way valve of the corresponding branch; pressure reducing valves are arranged at the tail ends of the high-pressure pipelines The low-pressure pipeline is connected with the pressure reducing valve, a sampling steel cylinder and an emptying assembly are arranged in the pipeline, an air inlet valve is arranged on the air inlet side of the sampling steel cylinder, an air outlet valve is arranged on the air outlet side of the sampling steel cylinder, and the air inlet valve and the air outlet valve are both connected to the low-pressure pipeline; the emptying assembly is connected with the low-pressure pipeline through an emptying valve; and an air outlet valve of the sampling steel cylinder is connected with the emptying valve. According to the utility model, different sampling inlets can be respectively matched with a hydrogenation gun, a storage tank or a transportation tank car of a hydrogen refueling station, so that the sampling adaptability is higher; through nitrogen purging before sampling, the sampling safety can be effectively ensured; the interference of residual gas can be eliminated, and the representativeness of the sampled sample is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas sampling, in particular to a high-purity and high-pressure hydrogen sampling device which can be connected to a hydrogenation station, a storage tank or a tank truck. Background Art

[0002] With the rapid development of hydrogen energy technology in recent years, the quality of hydrogen has a significant impact on the performance and life of fuel cell engines. During the daily use of hydrogen, hydrogen must be sampled and tested to ensure that the fuel hydrogen used meets the use standards of fuel cell engines. Therefore, during the hydrogen sampling process, it is necessary to ensure that the sampling can be carried out at a pressure of up to 70MPa and the hydrogen sampled is not contaminated in order to obtain accurate test results.

[0003] Chinese patent CN219038532U discloses a high-pressure hydrogen sampling device for a hydrogen refueling station, comprising a hydrogenation port, a venting quick connector, a nitrogen protection quick connector, a high-pressure pressure regulating valve, a proportional unloading valve, and a series of ball valves. The hydrogenation port is tightly connected to the hydrogenation gun and is respectively connected to the left and right trunnion ball valves. The left trunnion ball valve is a sampling switch valve, and the right trunnion ball valve is a purge switch valve. The upper left of the trunnion ball valve is connected to a high-pressure pressure regulating valve, and the high-pressure pressure regulating valve is respectively connected to a proportional unloading valve and a series of ball valves. The proportional unloading valve is connected to a nitrogen protection quick connector. One of the paths of the series of ball valves is connected to a sulfur-passivated coated cylinder, and the other paths are connected to an 8L sampling bottle through a cylinder connector. The right trunnion ball valve is connected to a venting quick connector through a filter, and the venting quick connector is connected to the vent port of the hydrogenator. This solution can effectively carry out high-pressure hydrogen sampling, meet the sample volume required for hydrogen testing, and avoid sampling being limited due to high-pressure safety factors, resulting in a lack of hydrogen quality monitoring.

[0004] Although this type of solution can ensure that sampling can obtain the required sample volume, the accuracy of sampling and its adaptability and portability in different scenarios still need to be improved.

[0005] Therefore, there is an urgent need for a high-purity, high-pressure hydrogen sampling device that can not only ensure the accuracy of sampling, but also be suitable for high-pressure hydrogen sampling in different hydrogen storage equipment such as hydrogen refueling stations, storage tanks or tank trucks.

[0006] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0007] The purpose of the utility model is to provide a high-pressure hydrogen sampling device, which can be adapted to the hydrogenation gun, storage tank or transport tank truck of the hydrogenation station through different sampling inlets, and has stronger sampling adaptability; by nitrogen purging before sampling, the safety of sampling can be effectively guaranteed; it can also eliminate residual gas interference and improve the representativeness of the sampled sample.

[0008] To achieve the above-mentioned purpose, the utility model provides a high-pressure hydrogen sampling device, which can be used to connect the hydrogenation gun, hydrogen storage tank or transport tank truck of a hydrogenation station, and at least includes: a high-pressure pipeline, which includes three branch pipelines, each branch pipeline is respectively provided with a first sampling inlet, a second sampling inlet, a purge gas interface and a high-pressure ball valve and a one-way valve of the corresponding branch; a pressure reducing valve is provided at the end of the high-pressure pipeline; a low-pressure pipeline, which is connected to the pressure reducing valve and a sampling cylinder and a vent assembly are arranged in the pipeline, an air inlet valve is provided on the air inlet side of the sampling cylinder, and an air outlet valve is provided on the air outlet side, and both the air inlet valve and the air outlet valve are connected to the low-pressure pipeline; the vent assembly is connected to the low-pressure pipeline through the vent valve, and the air outlet valve of the sampling cylinder is connected to the vent valve.

[0009] Furthermore, in the above technical solution, the first sampling inlet can be used to connect to a hydrogen storage tank or a transport tank truck, and the first high-pressure ball valve and the first one-way valve are connected in sequence on the corresponding branch pipeline; the second sampling inlet can be used to connect to the 35MPa or 70MPa hydrogenation gun of the hydrogenation station, and the second high-pressure ball valve and the second one-way valve are connected in sequence on the corresponding branch pipeline; the purge gas interface can be used to connect to a high-purity nitrogen cylinder, and the third high-pressure ball valve and the third one-way valve are connected in sequence on the corresponding branch pipeline.

[0010] Furthermore, in the above technical solution, the second sampling inlet is preferably provided with an infrared communication interface.

[0011] Furthermore, in the above technical solution, a bypass valve is provided between the pressure reducing valve and the vent valve, which is used to discharge the residual hydrogen in the sampling passage after the sampling cylinder is finished sampling and the valve provided is closed.

[0012] Furthermore, in the above technical solution, the high-pressure pipeline, the low-pressure pipeline and the valves on the pipeline can be wrapped with heating tape to perform high-temperature treatment on the sampling path before sampling.

[0013] Furthermore, in the above technical solution, the vent assembly can be a vent pipe with multiple sections; during the sampling process, the multiple sections of the vent pipe are connected end to end and placed vertically to meet the discharge height standard requirements.

[0014] Furthermore, in the above technical solution, a fourth one-way valve may be provided between the vent valve and the vent assembly; a safety valve may be provided between the pressure reducing valve and the fourth one-way valve, for directing the hydrogen to the fourth one-way valve and venting when the pressure reducing valve fails and the hydrogen pressure in the low-pressure pipeline exceeds a threshold value.

[0015] Furthermore, in the above technical solution, a high-pressure pressure gauge may be provided on the high-pressure pipeline; and a low-pressure pressure gauge may be provided on the low-pressure pipeline.

[0016] Furthermore, in the above technical solution, the internal surfaces of the pipelines and valves of the device can be passivated surfaces.

[0017] Furthermore, in the above technical solution, the sampling device can be connected to the ground wire through a grounding component.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The utility model can convert the sampled high-pressure hydrogen into low-pressure hydrogen, and then obtain the sampled gas through the sampling cylinder; it can be respectively adapted to the interfaces of hydrogen storage tanks and transport tank trucks, 35MPa hydrogenation guns at hydrogenation stations, and 70MPa hydrogenation guns at hydrogenation stations, making sampling more adaptable; the setting of the purge gas interface and the connection method of the valve in the low-pressure pipeline can replace the air inside the device with high-purity nitrogen before sampling, avoiding the mixing of hydrogen and oxygen in the air, eliminating the risk of explosion, and ensuring the safety of the sampling process;

[0020] 2) The second sampling inlet of the utility model is provided with an infrared communication interface, which can transmit the pressure and temperature data of the sampling device, and display and analyze them, ensuring the smooth progress of 70MPa high-pressure hydrogen sampling;

[0021] 3) All pipes and valves of the present invention are equipped with heating units (i.e., wrapped heating tapes), which can be purged with nitrogen before sampling to thoroughly purify impurities adsorbed inside the device pathways;

[0022] 4) The internal surfaces of the pipes and valves of this utility model are all passivated to prevent the adsorption of impurities specified in GB / T 37244 "Hydrogen Fuel for Proton Exchange Membrane Fuel Cell Vehicles";

[0023] 5) All pipelines and valves of the device of the utility model have been connected and wrapped with heating belts before sampling. The multi-section vent pipes are in a disassembled and separated state. Before on-site sampling, it is only necessary to prepare a sampling cylinder and connect the vent pipes to complete the sampling preparation work. The device has a compact structure and is convenient for sampling. The utility model can ensure sampling safety through the use of safety valves, ground wires and vent components.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a connection diagram of the high-pressure hydrogen sampling device of the utility model.

[0026] Description of main reference numerals:

[0027] 1- High-pressure pipeline, 11A- First sampling inlet, 11B- Second sampling inlet, 11C- Purge gas interface, 12A- First high-pressure ball valve, 12B- Second high-pressure ball valve, 12C- Third high-pressure ball valve, 13A- First one-way valve, 13B- Second one-way valve, 13C- Third one-way valve, 14- Pressure reducing valve, 15- High-pressure pressure gauge, 2- Low-pressure pipeline, 21- Sampling cylinder, 211- Inlet valve, 212- Outlet valve, 22- Vent assembly, 23- Vent valve, 24- Fourth one-way valve, 25- Bypass valve, 26- Safety valve, 27- Low-pressure pressure gauge, 28- Grounding assembly. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation.

[0029] Unless expressly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising” will be understood to include the stated elements or components but not to exclude other elements or components.

[0030] In this document, for ease of description, spatially relative terms such as "below," "beneath," "down," "above," "above," etc. may be used to describe the relationship of one element or feature to another element or feature in the accompanying drawings. It should be understood that the spatially relative terms are intended to encompass different orientations of an object in use or operation in addition to the orientation depicted in the drawings. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above directions. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatially relative terms used herein should be interpreted accordingly.

[0031] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit specific positions or relative relationships. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable with each other.

[0032] like Figure 1As shown, the present invention provides a high-pressure hydrogen sampling device that can be used to connect to the hydrogenation gun, hydrogen storage tank or transport tank truck (not shown in the figure) of a hydrogenation station, and includes at least a high-pressure pipeline 1 and a low-pressure pipeline 2. The high-pressure pipeline 1 includes three branch pipelines, each of which is respectively provided with a first sampling inlet 11A, a second sampling inlet 11B, a purge gas interface 11C, and a high-pressure ball valve and a one-way valve of the corresponding branch; a pressure reducing valve 14 is provided at the end of the high-pressure pipeline. A high-pressure pressure gauge 15 may also be provided on the high-pressure pipeline 1. The low-pressure pipeline 2 is connected to the pressure reducing valve 14 and a sampling cylinder 21 and a vent assembly 22 are arranged in the pipeline. The sampling cylinder 21 is provided with an inlet valve 211 on the air inlet side and an outlet valve 212 on the air outlet side. Both the inlet valve 211 and the outlet valve 212 are connected to the low-pressure pipeline; the vent assembly 22 is connected to the low-pressure pipeline via a vent valve 23, and the outlet valve 212 of the sampling cylinder 21 is connected to the vent valve 23. A low-pressure pressure gauge 27 may also be provided on the low-pressure pipeline 2 .

[0033] By adopting the above-mentioned technical scheme of the present invention, the sampled high-pressure hydrogen can be converted into low-pressure hydrogen, and then the sampling gas can be obtained through the sampling cylinder; the first sampling inlet and the second sampling inlet can be adapted to the interfaces of hydrogen storage tanks and transport tank trucks, 35MPa hydrogenation guns of hydrogenation stations or 70MPa hydrogenation guns of hydrogenation stations respectively, and the sampling adaptability is stronger, which enables sampling from high-pressure and high-purity hydrogen in 35MPa and 70MPa hydrogenation stations as well as sampling from hydrogen storage tanks and transport tank trucks; the setting of the purge gas interface and the connection method of the valve in the low-pressure pipeline can use high-purity nitrogen to replace the air inside the device before sampling, so as to avoid mixing of hydrogen with oxygen in the air, eliminate the risk of explosion, and ensure the safety of the sampling process.

[0034] Further Figure 1 As shown, specifically, the first sampling inlet 11A is used to connect to a hydrogen storage tank or transport tank truck, and is connected in sequence to a first high-pressure ball valve 12A and a first one-way valve 13A on the corresponding branch pipeline. The second sampling inlet 11B is used to connect to the 35MPa or 70MPa hydrogenation gun of the hydrogenation station, and is connected in sequence to a second high-pressure ball valve 12B and a second one-way valve 13B on the corresponding branch pipeline. The second sampling inlet 11B is preferably provided with an infrared communication interface, which can transmit the air pressure and temperature data of the sampling device, and display and analyze it to ensure the smooth progress of 70MPa high-pressure hydrogen sampling. The purge gas interface 11C is used to connect to a high-purity nitrogen cylinder (not shown in the figure), and is connected in sequence to a third high-pressure ball valve 12C and a third one-way valve 13C on the corresponding branch pipeline.

[0035] The high-pressure pipeline 1, low-pressure pipeline 2, and valves on the pipelines of the present invention are all wrapped with heating tape (not shown in the figure) to treat the sampling path at high temperature before sampling. The pipelines and valves of the present invention are all equipped with heating units (i.e., wrapped heating tapes), which can thoroughly purify the impurities adsorbed inside the device path while nitrogen purging before sampling. Furthermore, the internal surfaces of the pipelines and valves of the device of the present invention are all passivated surfaces. Such treatment can prevent the adsorption of impurities specified in GB / T 37244 "Hydrogen Fuel for Proton Exchange Membrane Fuel Cell Vehicles".

[0036] Further Figure 1 As shown, in the low-pressure pipeline of the present invention, a bypass valve 25 is provided between the pressure reducing valve 14 and the vent valve 23. This bypass valve 25 is used to vent residual hydrogen from the sampling path after the sampling cylinder 21 completes sampling and closes its own valve (not shown). Furthermore, a fourth check valve 24 is provided between the vent valve 23 and the vent assembly 22. A safety valve 26 is provided between the pressure reducing valve 14 and the fourth check valve 24. This safety valve 26 is used to direct hydrogen to the fourth check valve 24 for venting if the pressure reducing valve 14 malfunctions and the hydrogen pressure in the low-pressure pipeline exceeds a threshold.

[0037] The vent assembly 22 of the present invention is preferably a vent pipe with multiple sections (which are detachably connected and easy to carry). During the sampling process, the multiple sections of the vent pipe are connected end to end and placed vertically to meet the discharge height standard requirements. Before sampling, all the pipelines and valves of the present invention are connected and wrapped with heating tape, and the multiple sections of the vent pipe are in a disassembled and separated state. Before on-site sampling, it is only necessary to prepare a sampling cylinder 21 and connect the vent pipes to complete the sampling preparation work. The sampling device of the present invention can be connected to the ground wire through the grounding assembly 28 to ensure safety during the sampling process.

[0038] The sampling process of the present invention is described in detail below:

[0039] Before sampling, to ensure safety, high-purity nitrogen is used to replace the air inside the device. This prevents hydrogen from mixing with oxygen in the air and eliminates the risk of explosion. During this replacement, the high-purity nitrogen cylinder is connected to the purge gas port 11C. Nitrogen passes through the third high-pressure ball valve 12C, the third check valve 13C, the pressure reducing valve 14, the inlet valve 211, the sampling cylinder 21, the outlet valve 212, the vent valve 23, the fourth check valve 24, and the vent assembly 22. Nitrogen is continuously introduced until there is no air present, completing the replacement.

[0040] When sampling, the hydrogenation port (i.e., the first sampling inlet 11A or the second sampling inlet 11B) is connected to the hydrogenation gun or hydrogen storage tank or transport tank truck of the hydrogenation station, the air inlet valve 211 and the air outlet valve 212 of the low-pressure pipeline 2 are respectively connected to the two end interfaces of the sampling cylinder 21, and the venting component 22 is connected to the fourth one-way valve; the sampling device is connected to the ground wire of the hydrogen source such as the hydrogenator through the grounding component 28 to ensure safety. When hydrogen sampling, the high-pressure hydrogen of the hydrogenator passes through the connected hydrogenation port, the high-pressure ball valve of the corresponding branch, the one-way valve of the corresponding branch and the pressure reducing valve 14, and after the high-pressure hydrogen is reduced to low-pressure hydrogen by the pressure reducing valve 14, it enters the low-pressure pipeline 2; the low-pressure hydrogen passes through the air inlet valve 211, the sampling cylinder 21, the air outlet valve 212, the venting valve 23, the fourth one-way valve 24 and the venting component 22, respectively, to realize the filling of the sampling cylinder and the replacement of the residual gas in the sampling cylinder. In order to avoid the residual gas in the sampling device affecting the purity and safety of the hydrogen to be sampled, it is necessary to use the hydrogen to be sampled to replace the residual gas in the sampling path of the device. Before starting the hydrogenator, open the high-pressure ball valve and pressure reducing valve 14 of the corresponding branch of the high-pressure pipeline 1, and close the vent valve 23; start the hydrogenator to fill the sampling path of the device and the sampling cylinder with hydrogen, then close the high-pressure ball valve of the corresponding branch of the high-pressure pipeline 1, open the vent valve 23 to discharge the low-pressure hydrogen (2-6MPa) inside the sampling path of the device, and complete the gas replacement inside the device once; then repeat the inflation and venting operations, and repeat this replacement process until there is no residual gas inside the sampling path of the device. This improves the safety during hydrogen sampling and ensures the accuracy of hydrogen sampling; when hydrogen is formally sampled, the vent valve 23 of the vent assembly 22 is closed, the high-pressure ball valve of the corresponding branch of the high-pressure pipeline 1 is opened, and the sampled hydrogen passes through the high-pressure ball valve of the corresponding branch, the one-way valve of the corresponding branch, the pressure reducing valve 14, the air inlet valve 211, the sampling cylinder 21, the air outlet valve 212 and the low-pressure pressure gauge 27. After the sampling cylinder 21 is filled with hydrogen at a preset pressure, the valves (not shown) at both ends of the sampling cylinder 21 are closed. The hydrogenator is turned off, the vent valve 23 and the bypass valve 25 are opened, and the remaining hydrogen in the sampling passage of the emptying device is evacuated to complete a hydrogen sampling operation. When repeated sampling is required, the aforementioned replacement and sampling process of the sampling device is repeated. Sampling by the device of the utility model can eliminate residual gas interference and improve the representativeness of the sample being sampled.

[0041] The foregoing descriptions of specific exemplary embodiments of the present invention are for illustrative and illustrative purposes. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations are possible based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize the various exemplary embodiments of the present invention and various options and variations. Any simple modifications, equivalent variations, and modifications made to the above exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. A high-pressure hydrogen sampling device, characterized in that: It can be used to connect to hydrogen filling station’s hydrogen refueling gun, hydrogen storage tank or transport tank truck, including: The high-pressure pipeline includes three branch pipelines, each of which is provided with a first sampling inlet, a second sampling inlet, a purge gas interface, and a high-pressure ball valve and a one-way valve of the corresponding branch; a pressure reducing valve is provided at the end of the high-pressure pipeline; A low-pressure pipeline is connected to the pressure reducing valve and a sampling cylinder and a venting assembly are arranged in the pipeline. The air inlet side of the sampling cylinder is provided with an air inlet valve, and the air outlet side is provided with an air outlet valve, and the air inlet valve and the air outlet valve are both connected to the low-pressure pipeline; the venting assembly is connected to the low-pressure pipeline through the venting valve, and the air outlet valve of the sampling cylinder is connected to the venting valve.

2. The high-pressure hydrogen sampling device according to claim 1, characterized in that: The first sampling inlet is used to connect to a hydrogen storage tank or a transport tank truck, and is connected to a first high-pressure ball valve and a first one-way valve in sequence on the corresponding branch pipeline; the second sampling inlet is used to connect to a 35MPa or 70MPa hydrogenation gun of a hydrogenation station, and is connected to a second high-pressure ball valve and a second one-way valve in sequence on the corresponding branch pipeline; the purge gas interface is used to connect to a high-purity nitrogen cylinder, and is connected to a third high-pressure ball valve and a third one-way valve in sequence on the corresponding branch pipeline.

3. The high-pressure hydrogen sampling device according to claim 2, characterized in that: The second sampling inlet is provided with an infrared communication interface.

4. The high-pressure hydrogen sampling device according to claim 1, characterized in that: A bypass valve is provided between the pressure reducing valve and the vent valve, which is used to discharge the residual hydrogen in the sampling passage after the sampling cylinder has finished sampling and the self-contained valve is closed.

5. The high-pressure hydrogen sampling device according to claim 1, characterized in that: The high-pressure pipeline, the low-pressure pipeline and the valves on the pipeline are all wrapped with heating tapes, which are used to perform high-temperature treatment on the sampling path before sampling.

6. The high-pressure hydrogen sampling device according to claim 1, characterized in that: The vent assembly is a vent pipe with multiple sections. During the sampling process, the multiple sections of the vent pipe are connected end to end and placed vertically to meet the discharge height standard requirements.

7. The high-pressure hydrogen sampling device according to claim 1, characterized in that: A fourth one-way valve is provided between the vent valve and the vent assembly; a safety valve is provided between the pressure reducing valve and the fourth one-way valve, which is used to direct the hydrogen to the fourth one-way valve and vent when the pressure reducing valve fails and the hydrogen pressure in the low-pressure pipeline exceeds the threshold.

8. The high-pressure hydrogen sampling device according to claim 1, characterized in that: The high-pressure pipeline is provided with a high-pressure pressure gauge; the low-pressure pipeline is provided with a low-pressure pressure gauge.

9. The high-pressure hydrogen sampling device according to claim 1, characterized in that: The inner surfaces of the pipeline and valve of the sampling device are both passivated surfaces.

10. The high-pressure hydrogen sampling device according to claim 1, characterized in that: The sampling device is connected to the ground wire through a grounding component.

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