Hydrogen sampling device for medium-low pressure hydrogen storage tank

Abstract

The utility model discloses a hydrogen sampling device for a medium-low pressure hydrogen storage tank, which belongs to the technical field of medium-low pressure hydrogen sampling and comprises a plurality of sampling containers. The quantifying part is connected with the sample inlet and is used for quantitatively storing the hydrogen; the quantifying part comprises a quantifying pipeline, and a quantifying valve and a quantifying tank which are arranged on the quantifying pipeline; the sampling part is connected with the plurality of sampling containers; the sampling part comprises a sampling pipeline and a sampling valve mounted on the sampling pipeline; an outlet of the quantitative pipeline is connected with an inlet of the sampling pipeline; a first pressure gauge is installed at an outlet of the quantitative pipeline. An emptying pipeline connected with the recovery port is arranged at the rear end of the sampling container; a pressure gauge II is mounted on the emptying pipeline; and the sample inlet is connected in parallel with a purging port. According to the utility model, the quantitative sampling can be realized, the sampling pressure and the total amount can be effectively controlled within the range in the sampling process, and the sample collection can be more conveniently and stably carried out on the hydrogen storage tank with the pressure of 15Mpa to 20Mpa.

Description

Technical Field

[0001] The utility model belongs to the technical field of medium and low pressure hydrogen sampling, and in particular relates to a hydrogen sampling device for medium and low pressure hydrogen storage tanks. Background Art

[0002] At present, the hydrogen energy industry at home and abroad is a new energy and emerging industry with rapid development. The country attaches great importance to it. Hydrogen storage technology is an important part of the hydrogen industry. The quality of hydrogen is closely related to the operating efficiency and service life of hydrogen compressors and hydrogen fuel cells. Therefore, it is particularly important to supervise and inspect the quality of hydrogen in storage tanks. Some domestic sampling technologies use hydrogen filling machines at hydrogen filling stations for sampling. This type of sampling can only detect hydrogen at the end-use end, but cannot directly detect hydrogen in storage tanks and effectively take regulatory measures. Therefore, it is extremely important to develop a set of sampling devices specifically for hydrogen storage tanks.

[0003] The general pressure of hydrogen in existing hydrogen storage tanks is 15Mpa~20Mpa. The equipment should have good pressure resistance and sealing ability during the sampling process of hydrogen storage tanks. In order to ensure the safety of sampling work and the safety of operators, the collected sample gas needs to be reasonably decompressed to improve the safety of sampling operation. Therefore, in order to meet the safety of the use of hydrogen storage tank hydrogen sampling device, the authenticity of the sampled samples, the practicality of the system, etc., it is of great significance to design a hydrogen sampling device for medium and low pressure hydrogen storage tanks. Summary of the invention

[0004] In view of the problems in the prior art, the utility model discloses a hydrogen sampling device for medium and low pressure hydrogen storage tanks. The sampling device is mainly used for collecting sample gas from 15Mpa to 20Mpa hydrogen storage tanks. The utility model addresses the technical difficulties shown in the current prior art and realizes safe, stable and quantitative sampling of hydrogen storage tanks, effectively controls the pressure change during the sampling process, and improves the safety and practicality of the use of the sampling device.

[0005] The utility model is realized by the following technical solutions:

[0006] A hydrogen sampling device for medium and low pressure hydrogen storage tanks, comprising:

[0007] Several sampling containers;

[0008] A quantitative part connected to the sample inlet and used for quantitatively storing hydrogen; the quantitative part includes a quantitative pipeline, a quantitative valve installed on the quantitative pipeline, and a quantitative tank;

[0009] A sampling part connected to a plurality of sampling containers; the sampling part comprises a sampling pipeline and a sampling valve installed on the sampling pipeline; wherein:

[0010] The outlet of the quantitative pipeline is connected to the inlet of the sampling pipeline; a No. 1 pressure gauge is installed at the outlet position of the quantitative pipeline; an emptying pipeline connected to the recovery port is provided at the rear end of the sampling container, and a No. 2 pressure gauge is installed on the emptying pipeline; a purge port is connected in parallel at the sampling port.

[0011] Preferably, in order to ensure the normal working state of the quantitative part, the quantitative valve includes an injection valve installed between the quantitative tank inlet and the injection port, and a stop valve installed on the outlet side of the quantitative tank.

[0012] Preferably, in order to ensure the safe working state of the quantitative part, a safety pressure regulator is installed between the injection valve and the inlet of the quantitative tank.

[0013] Preferably, in order to achieve separate sampling of hydrogen with different capacities or different components, the sampling container includes a 1L sampling cylinder set and an 8L sampling bottle.

[0014] Preferably, in order to ensure the safe working state of the sampling part, the sampling valve includes a No. 1 high-pressure ball valve and a pressure regulating valve installed between the front end of the 1L sampling cylinder group and the quantitative pipeline outlet.

[0015] Preferably, in order to ensure the safe working state of the sampling part, the sampling valve includes a No. 2 high-pressure ball valve installed between the front end of the 8L sampling bottle and the quantitative pipeline outlet.

[0016] Preferably, in order to ensure the safe working state of the 8L sampling bottle, a buffer tube is installed between the No. 2 high-pressure ball valve and the front end of the 8L sampling bottle.

[0017] Preferably, in order to ensure the safe working state of the emptying pipeline, a check valve and a flame arrester are installed on the emptying pipeline in sequence.

[0018] Preferably, the pressure regulating valve is connected to the recovery port via a No. 1 drain valve, a check valve and a flame arrester in sequence.

[0019] Preferably, the rear end of the quantitative tank is connected to the recovery port through a safety valve and a flame arrester in sequence; and the safety pressure regulator is connected to the recovery port through the flame arrester.

[0020] Compared with the prior art, the advantages and positive effects of this application are:

[0021] The utility model adds a quantitative part to the sampling device, so that the technical purpose of safe and fast quantitative sampling can be achieved. During the sampling process, the sampling pressure and the total amount can be effectively controlled within the target range, and samples can be collected from hydrogen storage tanks of 15Mpa to 20Mpa more conveniently and stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural diagram of a preferred embodiment of the utility model.

[0024] Among them, 1. Air inlet; 2. Injection valve; 3. Safety pressure regulator; 4. Quantitative tank; 5. Safety valve; 6. Stop valve; 7. Pressure gauge; 8. No. 1 high-pressure ball valve; 9. Pressure regulating valve; 10. 1L sampling cylinder group; 11. No. 1 drain valve; 12. No. 2 high-pressure ball valve; 13. Buffer tube; 14. 8L sampling bottle; 15. No. 2 drain valve; 16. Check valve; 17. No. 2 pressure gauge; 18. Flame arrester; 19. Drain port; 20. Purge port; 21. Purge valve. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below, and preferred embodiments of the present invention will be given. For the content of the present invention, it should be understood that the following embodiments are only used for more detailed description, and should not be understood as limiting the present invention in any form, that is, it is not intended to limit the scope of protection of the present invention; relational terms such as "No. 1" and "No. 2" are only used to distinguish one component from another with the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0026] See also Figure 1 , a hydrogen sampling device for medium and low pressure hydrogen storage tanks, comprising:

[0027] Several sampling containers;

[0028] A quantitative part connected to the sample inlet 1 and used for quantitatively storing hydrogen; the quantitative part includes a quantitative pipeline, a quantitative valve installed on the quantitative pipeline and a quantitative tank 4;

[0029] A sampling part connected to a plurality of sampling containers; the sampling part comprises a sampling pipeline and a sampling valve installed on the sampling pipeline; wherein:

[0030] The outlet of the quantitative pipeline is connected to the inlet of the sampling pipeline; a No. 1 pressure gauge 7 is installed at the outlet of the quantitative pipeline; an emptying pipeline connected to the recovery port 19 is provided at the rear end of the sampling container, and a No. 2 pressure gauge 17 is installed on the emptying pipeline; a purge port 20 is connected in parallel to the sampling port 1. The purge port 20 is connected to the quantitative pipeline through a purge valve 21;

[0031] The quantitative part mainly includes: injection port 1, injection valve 2, safety pressure regulator 3, quantitative tank 4, safety valve 5, stop valve 6 and quantitative pipeline; the quantitative pipeline is connected with the sampling pipeline;

[0032] The sampling part mainly includes a pressure regulating valve 9 connected to a 1L sampling cylinder group 10, a No. 1 high-pressure ball valve 8, a buffer tube 13 connected to an 8L sampling bottle 14, and a No. 2 high-pressure ball valve 12 connected in parallel; a No. 1 drain valve 11 and a check valve 16 are arranged at the rear end of the 1L sampling cylinder group 10, and a No. 2 drain valve 15 at the rear end of the 8L sampling cylinder 14 are connected in series, and are connected to a recovery port 19 through a No. 2 pressure gauge 17 and a flame arrester 18;

[0033] The sample injection quantitative part is also connected to the recovery pipeline through a safety pressure regulator and a safety valve;

[0034] The sample injection quantitative part is also connected in series with the purge port through the sample injection valve;

[0035] The above-mentioned design of the utility model controls the total amount of sample gas in the system through the sampling quantitative part, realizes the control ability of the total amount of sampling of the device, and improves the safety of sampling of the device; and adjusts and safely discharges the sampling quantitative part through the safety pressure regulator and the safety valve, which greatly improves the stability of the quantitative sampling process of the sample gas. The sampling part performs secondary pressure regulation on the 1L sampling cylinder group, which can effectively control the sampling pressure of the 1L sampling cylinder, and is equipped with a high-pressure ball valve, which can effectively control the start and stop of sampling; the buffer tube at the front end of the 8L sampling bottle can stabilize the pressure and flow of the sample gas flowing into the front end, so that the sample gas can flow stably into the 8L sampling bottle, and the No. 2 high-pressure ball valve can interrupt its sampling; the 1L sampling cylinder group part of the sampling part and the 8L sampling bottle part are connected to the front-end pipeline in parallel, and the sampling process does not interfere with each other, and the sampling volume of the 1L sampling cylinder group is less than that of the 8L sampling bottle. An emptying valve is designed at the rear end of the sampling section to empty the 1L sampling cylinder group and the 8L sampling bottle respectively. A check valve, pressure gauge and flame arrester are also provided to allow the discharge pipeline pressure to be visible at all times, thereby improving the safety of the device. The sampling device is also provided with a purging function. The purge port, purge valve and sampling port are connected in parallel to the main pipeline of the device. The purge process is the same as the gas flow through the pipeline during the sampling process. The purge process does not require quantitative measurement. The purge gas passes through the No. 1 high-pressure ball valve and pressure reducing valve at the front end of the cylinder and the needle valve equipped with the cylinder, flows through the 1L sampling cylinder group, and is discharged to the emptying pipeline through the needle valve at the rear end of the cylinder. The 1L sampling cylinder group is purged for at least 1 minute. During the purging process of the 8L sampling cylinder, the purge gas needs to enter the cylinder through the No. 2 high-pressure ball valve and buffer tube, and the No. 2 high-pressure ball valve is closed, and the No. 2 emptying valve is opened to empty the 8L sampling bottle. The 8L sampling bottle is purged 5 to 8 times. The above-mentioned purging process can improve the authenticity of the sample gas collected by the sampling device, and nitrogen is used as the purge gas. Nitrogen is an inert gas that does not react naturally with hydrogen, which can increase the service life of the device and improve the safety of sampling in the device.

[0036] Parameter description of each accessory of the sampling device:

[0037] The main pipe of the sampling device is made of British seamless steel pipe with a diameter of 3 / 8*D=2.2mm, where D is the wall thickness of the pipe;

[0038] The sampling valve, purge valve and stop valve are all high-pressure needle valves with a design pressure of 15000psig;

[0039] The pressure adjustment range of the safety pressure regulator is 0-15Mpa, and the valve body pressure resistance is 45Mpa;

[0040] The inlet and outlet of the safety pressure regulator are respectively equipped with pressure gauges, the inlet pressure gauge display range is 0-30Mpa, the outlet pressure gauge display range is 0-120Mpa, and the outlet pressure is set to 15Mpa;

[0041] The safety regulator is equipped with a bursting diaphragm. If the safety valve of the quantitative injection part is damaged, the outlet pressure of the safety regulator is too high, causing the bursting diaphragm to rupture, and the sample gas of the quantitative injection part can be urgently emptied. This function is a one-time function. After the bursting diaphragm is damaged, the safety regulator needs to be re-maintained and a new bursting disc needs to be installed.

[0042] The volume of the quantitative tank is 4L, the design pressure is 20Mpa, the working pressure is 15Mpa, and the specific injection pressure is observed by the pressure gauge at the outlet of the safety pressure regulator;

[0043] The design pressure of the safety valve is 0-30Mpa, and the automatic pressure relief pressure is set slightly higher than the quantitative pressure of the quantitative tank by 1Mpa-3Mpa, and shall not exceed the design pressure of the quantitative tank;

[0044] The design pressure of the high-pressure ball valve is 5000psig, which is about 34.4Mpa;

[0045] The outlet pressure range of the pressure regulating valve is 0-10Mpa, and the outlet pressure is set to 7Mpa;

[0046] The design pressure of the 1L sampling cylinder set is 20Mpa;

[0047] The design pressure of the 8L sampling bottle is 15Mpa;

[0048] The display range of pressure gauge No. 1 and pressure gauge No. 2 is 0~10Mpa;

[0049] The nitrogen purge pressure is 0.8 MPa.

[0050] The exhaust valve is designed for a pressure of 5000 psig.

[0051] Working principle: In order to make the specific operation of the utility model clearer, the following operation method is provided: Sampling reference standards T / CECA, G 0186, 2022 "Specifications for Hydrogen Sampling for Proton Exchange Membrane Fuel Cells", the specific operation is as follows:

[0052] The pressure adjustment of the safety voltage regulator and the pressure regulating valve has been set in advance, and there is no need for on-site sampling and adjustment. Before entering the sampling site, the operator needs to discharge static electricity and connect the safety grounding clamp to the sampling device;

[0053] Check the status of all valves of the sampling device and observe all pressures. All pressure indications should be 0;

[0054] Connect the sampling port of the sampling device to the sampling interface reserved on the hydrogen storage tank. It is forbidden to use a high-pressure metal hose for this connection. It is necessary to directly use the sampling pipe joint equipped with the sampling device for connection; and connect the recovery pipeline interface of the emptying tank on site, and open the recovery pipeline control valve;

[0055] Connect the purge port to the nitrogen source purge interface through a metal hose, and open the system No. 1 high-pressure ball valve and the needle valves at both ends of the 1L sampling cylinder group to purge and flush the sampling cylinder group. The flushing time is 1 minute. After the purge is completed, close the needle valve at the outlet of the 1L sampling cylinder and the No. 1 high-pressure ball valve; then open the No. 2 high-pressure ball valve to purge the 8L sampling cylinder. When the pressure of the 8L sampling cylinder reaches 0.8Mpa as shown on the pressure gauge, close the No. 2 high-pressure ball valve and open the No. 2 drain valve to drain. Repeat this process 5 to 8 times. After the purge is completed, close the No. 2 drain valve, No. 2 high-pressure ball valve, and purge valve;

[0056] Open the sampling device injection valve, the stop valve is in the closed state, then open the reserved sampling valve of the hydrogen storage tank to quantify the sample gas. When the pressure of the sample gas quantitative tank is 15Mpa, close the reserved sampling valve of the hydrogen storage tank;

[0057] Open the No. 1 high-pressure ball valve to sample the 1L sampling cylinder group. The sampling pressure is 7Mpa. The specific reading can be observed through the pressure gauge at the outlet of the pressure regulating valve. After the sampling of the 1L sampling cylinder group is completed, close the sampling cylinder inlet needle valve and the No. 1 high-pressure ball valve; and open the No. 2 high-pressure ball valve to introduce the sample gas into the 8L sampling cylinder. The specific pressure is observed through the pressure gauge. The actual sampling pressure range is 4Mpa~6Mpa.

[0058] After sampling is completed, close the bottle valve of the 8L sampling bottle, open the No. 1 drain valve, No. 2 drain valve and No. 1 high-pressure ball valve to drain the system, and when the pressure of all system pipelines is 0, close all valves and restore the system.

[0059] Verification results analysis

[0060] The technical specifications of the main accessories in the above embodiment are shown in Table 1 below:

[0061] (1) It can be used for sampling 15-20Mpa in low-pressure hydrogen storage tanks in hydrogen storage stations;

[0062] (2) The system has pressure reduction, flow stabilization, and safe discharge processing to maintain the stability of the sampling process;

[0063] (3) The system's 1L sampling cylinder set is treated with silane passivation to ensure the authenticity of sample collection;

[0064] Table 1 Technical specifications of the main accessories of the online sampling system

[0065]

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A hydrogen sampling device for medium and low pressure hydrogen storage tanks, comprising a plurality of sampling containers; characterized in that: At least: A quantitative part connected to the sample inlet (1) and used for quantitatively storing hydrogen; the quantitative part comprises a quantitative pipeline, a quantitative valve installed on the quantitative pipeline, and a quantitative tank (4); A sampling part connected to a plurality of sampling containers; the sampling part comprises a sampling pipeline and a sampling valve installed on the sampling pipeline; wherein: The outlet of the quantitative pipeline is connected to the inlet of the sampling pipeline; a No. 1 pressure gauge (7) is installed at the outlet of the quantitative pipeline; an emptying pipeline connected to a recovery port (19) is provided at the rear end of the sampling container, and a No. 2 pressure gauge (17) is installed on the emptying pipeline; and a purge port (20) is connected in parallel to the sampling port (1).

2. The hydrogen sampling device for medium and low pressure hydrogen storage tanks according to claim 1 is characterized in that: The quantitative valve comprises an injection valve (2) installed between the inlet of the quantitative tank (4) and the injection port (1), and a stop valve (6) installed on the outlet side of the quantitative tank (4).

3. The hydrogen sampling device for medium and low pressure hydrogen storage tanks according to claim 2 is characterized in that: A safety pressure regulator (3) is installed between the injection valve (2) and the inlet of the quantitative tank (4).

4. The hydrogen sampling device for medium and low pressure hydrogen storage tanks according to claim 3 is characterized in that: The sampling container comprises a 1L sampling steel cylinder set (10) and an 8L sampling bottle (14).

5. The hydrogen sampling device for medium and low pressure hydrogen storage tanks according to claim 4, characterized in that: The sampling valve comprises a No. 1 high-pressure ball valve (8) and a pressure regulating valve (9) installed between the front end of a 1L sampling steel cylinder group (10) and an outlet of a quantitative pipeline.

6. The hydrogen sampling device for medium and low pressure hydrogen storage tanks according to claim 4, characterized in that: The sampling valve comprises a No. 2 high-pressure ball valve (12) installed between the front end of an 8L sampling bottle (14) and an outlet of a quantitative pipeline.

7. The hydrogen sampling device for medium and low pressure hydrogen storage tanks according to claim 6, characterized in that: A buffer tube (13) is installed between the No. 2 high-pressure ball valve (12) and the front end of the 8L sampling bottle (14).

8. The hydrogen sampling device for medium and low pressure hydrogen storage tanks according to claim 4, characterized in that: A check valve (16) and a flame arrester (18) are sequentially installed on the exhaust pipeline.

9. The hydrogen sampling device for medium and low pressure hydrogen storage tanks according to claim 5, characterized in that: The pressure regulating valve (9) is connected to the recovery port (19) via a No. 1 drain valve (11), a check valve (16), and a flame arrester (18) in sequence.

10. The hydrogen sampling device for medium and low pressure hydrogen storage tanks according to claim 5, characterized in that: The rear end of the quantitative tank (4) is connected to the recovery port (19) via the safety valve (5) and the flame arrester (18) in sequence; the safety pressure regulator (3) is connected to the recovery port (19) via the flame arrester (18).

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