Wide-pressure-range hydrogen sampler

Abstract

The utility model relates to the technical field of hydrogen detection, in particular to a wide-pressure-range hydrogen sampler, which comprises a hydrogen sampling tank, a hydrogen sampling pipeline, an inert gas sampling pipeline and an inert gas tank, solves the problem of hydrogen gas sampling through outflow and inflow of inert gas, and further comprises a negative pressure device, the negative pressure device comprises an inert gas buffer tank and a Venturi tube communicated with the inert gas buffer tank, and the inert gas buffer tank is communicated with an inert gas conveying pipeline between the second control valve and the inert gas tank through an inert gas buffer pipeline; one end of the negative pressure tapping pipeline is communicated with the inert gas conveying pipeline between the second control valve and the hydrogen sampling tank, and the other end of the negative pressure tapping pipeline is communicated with the Venturi tube negative pressure tapping section. According to the utility model, the problem of low-pressure hydrogen gas sampling is solved, so that wide-pressure-range portable hydrogen sample sampling is realized.

Description

Technical Field

[0001] The utility model relates to the field of hydrogen energy detection, in particular to a hydrogen sampler with a wide pressure range. Background Art

[0002] At present, the quality of hydrogen is mostly analyzed by gas chromatography. The preparation and transportation of hydrogen are both in gaseous state, and often face a wide pressure range. Commercial vehicles on the market mainly use 35MPa high-pressure gaseous hydrogen storage technology. Hydrogen sample injection under normal pressure often uses sample bags to be manually squeezed and injected. This sampling and injection method cannot integrate the working conditions of high-pressure hydrogen sampling. If the hydrogen sampling injector is designed as a suction device like an air pump, there is a risk of piston ejection at high pressure and there are also problems with air tightness. The above problems can be avoided by designing the hydrogen sample storage device in a can shape. The can-shaped sample tank faces the problem of having to withstand a certain high pressure and being able to inject low-pressure hydrogen sample gas into the gas chromatograph. Summary of the invention

[0003] The utility model provides a hydrogen sampler with a wide pressure range, which blows low-pressure sample gas into a gas chromatograph through a chromatographic inert carrier gas, thereby solving the problem of integrating low-pressure sample hydrogen injection with high-pressure sample injection.

[0004] The utility model achieves the above-mentioned purpose through the following technical scheme, a wide pressure range hydrogen sampler, comprising: a hydrogen sampling tank, and an inert gas tank connected to the hydrogen sampling tank, the hydrogen sampling tank and the inert gas tank are connected through an inert gas transmission pipeline, and a first control valve is provided on the inert gas transmission pipeline.

[0005] Furthermore, a hydrogen pressure gauge and a hydrogen inlet pipeline are provided on the hydrogen sampling tank body, and a second control valve is provided on the hydrogen inlet pipeline.

[0006] Furthermore, an inert gas pressure gauge is provided on the inert gas tank.

[0007] Furthermore, the inert gas tank is provided with an inert gas supply pipeline, and the inert gas supply pipeline is provided with a third control valve and a one-way valve.

[0008] Furthermore, the hydrogen sampling tank is connected to the negative pressure device.

[0009] Further, the negative pressure device includes: an inert gas buffer tank and a venturi tube connected to the inert gas buffer tank, the inert gas buffer tank is connected to the inert gas gas delivery pipeline between the first control valve and the inert gas tank through an inert gas buffer pipeline, and the inert gas buffer pipeline is provided with a fourth control valve;

[0010] The negative pressure taking pipeline has one end connected to the inert gas delivery pipeline between the first control valve and the hydrogen sampling tank, and the other end connected to the negative pressure taking section of the venturi tube. The negative pressure taking pipeline is provided with a fifth control valve.

[0011] Furthermore, a fifth control valve is provided on the inert gas delivery pipeline between the first control valve and the inert gas tank.

[0012] The beneficial effects of the utility model are as follows: the problem of sampling hydrogen gas, especially low-pressure hydrogen gas, is solved through the inflow and outflow of inert gas, so as to realize the sampling and injection of portable hydrogen samples in a wide pressure range. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 High-pressure and medium-pressure hydrogen sampling device structure diagram

[0014] Figure 2 Low-pressure hydrogen sampling device structure diagram

[0015] Figure 3 Hydrogen sampler product overview

[0016] Figure 4 Overall structure diagram of hydrogen sampler

[0017] In the figure: 1, first control valve 2, hydrogen sampling tank 3, hydrogen pressure gauge 4, fifth control valve 5, second control valve 6, fourth control valve 7, inert gas buffer tank 8, sixth control valve 9, venturi tube 10, inert gas pressure gauge 11, inert gas tank 12, third control valve 13, one-way valve. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] It should be noted that:

[0020] The utility model provides high-pressure hydrogen sampling, wherein the high-pressure hydrogen refers to hydrogen with a pressure greater than or equal to three atmospheres.

[0021] The utility model provides for sampling of medium-pressure hydrogen, wherein the medium-pressure hydrogen refers to hydrogen with a pressure greater than or equal to one atmosphere and less than three atmospheres.

[0022] The utility model is for sampling low-pressure hydrogen, and the low-pressure hydrogen refers to hydrogen with a pressure less than one atmosphere.

[0023] Please refer to Figure 1 A wide pressure range hydrogen sampler comprises: a hydrogen sampling tank 2, and an inert gas tank 11 connected to the hydrogen sampling tank 2, the hydrogen sampling tank 2 and the inert gas tank 11 are connected through an inert gas transmission pipeline, a second control valve 5 is provided on the inert gas transmission pipeline, and the second control valve 5 is used to control the opening and closing of the inert gas transmission pipeline from the inert gas tank 11 to the hydrogen sampling tank 2;

[0024] When the sampled hydrogen sample is high pressure, open the second control valve 5, purge the hydrogen sampling tank 2, and then take samples. The high pressure hydrogen sample enters the hydrogen sampling tank 2. After the detection is completed, the remaining hydrogen sample is purged with inert gas.

[0025] Furthermore, a hydrogen pressure gauge 3 and a hydrogen inlet pipeline are provided on the hydrogen sampling tank 2. The hydrogen pressure gauge 3 is used to measure the pressure of hydrogen in the hydrogen sampling tank 2. A first control valve 1 is provided on the hydrogen inlet pipeline to control the opening and closing of the hydrogen inlet pipeline.

[0026] When in use, open the second control valve 5 and the first control valve 1, use inert gas to purge the hydrogen sampling tank 2 and the hydrogen injection pipeline, then close the second control valve 5 and the first control valve 1 to maintain the pressure of the hydrogen sampling tank 2 at one atmosphere. Connect the hydrogen injection pipeline with the high-pressure hydrogen sample pipeline, open the first control valve 1, and the high-pressure hydrogen gas enters the hydrogen sampling tank 2. When the pressure of the hydrogen sampling tank 2 reaches three atmospheres, close the first control valve 1 to end hydrogen extraction. Connect the hydrogen injection pipeline with the gas chromatography injection pipeline, open the first control valve 1, and the sample hydrogen in the hydrogen sampling tank 2 enters the gas chromatography injection pipeline due to pressure.

[0027] As an embodiment, the wide pressure range hydrogen sampler further includes:

[0028] The inert gas pressure gauge 10 disposed on the inert gas tank 11 is used to measure the pressure of the inert gas in the inert gas tank 11;

[0029] The inert gas tank 11 is provided with an inert gas supply pipeline for replenishing the inert gas tank 11 with inert gas. In order to control the inert gas supply pipeline, a third control valve 12 and a one-way valve 13 are provided on the inert gas supply pipeline.

[0030] When the hydrogen sample pressure is medium pressure, open the second control valve 5 and the first control valve 1, use inert gas to purge the hydrogen sampling tank 2 and the hydrogen injection pipeline, and then close the second control valve 5 and the first control valve 1 to maintain the pressure of the hydrogen sampling tank 2 at one atmosphere. Connect the hydrogen injection pipeline with the medium-pressure hydrogen sample pipeline, open the first control valve 1, and the medium-pressure hydrogen gas enters the hydrogen sampling tank 2. Close the first control valve 1, open the second control valve 5, and the inert gas enters the hydrogen sampling tank 2 from the inert gas tank 11. When the pressure of the hydrogen sampling tank 2 reaches three atmospheres, close the second control valve 5. Connect the hydrogen injection pipeline with the gas chromatography injection pipeline, open the first control valve 1, and the sample hydrogen in the hydrogen sampling tank 2 enters the gas chromatography injection pipeline due to pressure.

[0031] As an implementation, please refer to Figure 2 The wide pressure range hydrogen sampler also includes: a negative pressure device connected to the hydrogen sampling tank 2.

[0032] When the hydrogen sample pressure is low pressure, after the wide pressure range hydrogen sampler is purged, the hydrogen injection line is connected to the low pressure hydrogen sample line, the first control valve 1 is opened, and the negative pressure device is opened at the same time, the hydrogen sampling tank 2 becomes negative pressure, the low pressure hydrogen sample is sucked into the hydrogen sampling tank 2, the first control valve 1 is closed, the second control valve 5 is opened, the inert gas enters the hydrogen sampling tank 2 from the inert gas tank 11, and when the pressure of the hydrogen sampling tank 2 reaches three atmospheres, the second control valve 5 is closed. The hydrogen injection line is connected to the gas chromatography injection line, and the first control valve 1 is opened, and the sample hydrogen in the hydrogen sampling tank 2 enters the gas chromatography injection line due to pressure.

[0033] Further, the negative pressure device includes: an inert gas buffer tank 7 and a venturi tube 9 connected to the inert gas buffer tank 7, the inert gas buffer tank 7 is connected to the inert gas gas delivery pipeline between the second control valve 5 and the inert gas tank 11 through an inert gas buffer pipeline, and the inert gas buffer pipeline is provided with a fourth control valve 6;

[0034] The negative pressure pipeline is connected to the inert gas pipeline between the second control valve 5 and the hydrogen sampling tank 2, and the other end is connected to the negative pressure section of the venturi tube 9. The negative pressure pipeline is provided with a fifth control valve 4.

[0035] Furthermore, a sixth control valve 8 is provided on the inert gas delivery pipeline between the second control valve 5 and the inert gas tank 11 .

[0036] When in use, open the second control valve 5 and the first control valve 1, use the inert gas to purge the hydrogen sampling tank 2 and the hydrogen inlet pipeline, and then close the second control valve 5 and the first control valve 1 to maintain the pressure of the hydrogen sampling tank 2 at one atmosphere. At the same time, open the fifth control valve 4, the sixth control valve 8, and the fourth control valve 6, and the inert gas enters the inert gas outlet pipeline from the inert gas tank 11. The venturi tube 9 generates negative pressure, and the inert gas in the hydrogen sampling tank is extracted to make the hydrogen sampling tank negative pressure state. When the pressure of the hydrogen sampling tank is lower than the low-pressure hydrogen pressure, close the fifth control valve 4, the sixth control valve 8, and the fourth control valve 6 at the same time. Connect the hydrogen inlet pipeline with the low-pressure hydrogen sample pipeline, open the first control valve 1, and the low-pressure hydrogen gas enters the hydrogen sampling tank 2. Close the first control valve 1, open the second control valve 5, and the inert gas enters the hydrogen sampling tank 2 from the inert gas tank 11. When the pressure of the hydrogen sampling tank 2 reaches three atmospheres, close the second control valve 5. Connect the hydrogen injection pipeline with the gas chromatography injection pipeline, open the first control valve 1 and the hydrogen sampling tank 2, and the sample hydrogen enters the gas chromatography injection pipeline due to pressure.

Claims

1. A hydrogen sampler with a wide pressure range, characterized by comprising: A hydrogen sampling tank (2), and an inert gas tank (11) connected to the hydrogen sampling tank (2), the hydrogen sampling tank (2) and the inert gas tank (11) are connected via an inert gas transmission pipeline, and a second control valve (5) is provided on the inert gas transmission pipeline.

2. The wide pressure range hydrogen sampler according to claim 1, characterized in that: A hydrogen pressure gauge (3) and a hydrogen inlet pipeline are provided on the tank body of the hydrogen sampling tank (2), and a first control valve (1) is provided on the hydrogen inlet pipeline.

3. The wide pressure range hydrogen sampler according to claim 1, characterized in that: The inert gas tank (11) is provided with an inert gas pressure gauge (10).

4. The wide pressure range hydrogen sampler according to claim 1, characterized in that: The inert gas tank (11) is provided with an inert gas supply pipeline, and the inert gas supply pipeline is provided with a third control valve (12) and a one-way valve (13).

5. The wide pressure range hydrogen sampler according to any one of claims 1 to 4, characterized in that: The hydrogen sampling tank (2) is connected to the negative pressure device.

6. The wide pressure range hydrogen sampler according to claim 5, characterized in that: The negative pressure device comprises: an inert gas buffer tank (7) and a venturi tube (9) connected to the inert gas buffer tank (7); the inert gas buffer tank (7) is connected to an inert gas gas transmission pipeline between the second control valve (5) and the inert gas tank (11) through an inert gas buffer pipeline; the inert gas buffer pipeline is provided with a fourth control valve (6); The negative pressure sampling pipeline has one end connected to the inert gas transmission pipeline between the second control valve (5) and the hydrogen sampling tank (2), and the other end connected to the negative pressure sampling section of the venturi tube (9). The negative pressure sampling pipeline is provided with a fifth control valve (4).

7. The wide pressure range hydrogen sampler according to claim 6, characterized in that: A sixth control valve (8) is also provided on the inert gas transmission pipeline between the second control valve (5) and the inert gas tank (11).

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