Sampling tank for storing ambient air samples

An ambient air and sampling tank technology, which is used in fixed-capacity gas storage tanks, gas/liquid distribution and storage, gaseous chemical plating, etc., can solve the problems of sampling failure, easy adsorption, corrosion resistance, etc. , Stable storage performance, ensure the effect of accuracy

Pending Publication Date: 2021-11-09
赵永刚 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Difficulty 1: Not resistant to corrosion, there will be a large amount of harmful components such as sulfide in industrial environments or explosion sites, which will combine with water molecules in the air to form corrosive substances, which will continue to erode the inner wall of the tank and generate new substances after interaction, making the collection Changes in the gas composition of the gas will cause sampling failure, and will also gr...

Method used

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  • Sampling tank for storing ambient air samples
  • Sampling tank for storing ambient air samples
  • Sampling tank for storing ambient air samples

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0029] The air sampling tank provided by the present invention comprises the following structure:

[0030] The sampling tank includes the following structure: a tank body 4 formed by seamless welding of two hemispheres, the upper part of the tank body 4 has a gas port and a valve 6, and the valve 6 is connected with a pressure gauge 7; There is a silicon film layer on the inner wall of the tank body 4, and the coating steps are as follows:

[0031] S1: Vacuumize the sampling tank, fill it with nitrogen, evacuate it, and then fill it with nitrogen, and repeat this cycle until the nitrogen in the sampling tank accounts for more than 99% of the gas in the tank; both vacuuming and nitrogen filling are carried out at room temperature; Keep the pressure at 0.3Mpa during nitrogen treatment;

[0032] S2: Vacuum the sampling tank and fill it with high-temperature hydrogen at 500°C; vacuum again and fill it with high-temperature hydrogen, and repeat this cycle until the hydrogen in the...

Embodiment 1B

[0045] The preparation process of the tank body is the same as in Example 1A, and the coating steps are as follows:

[0046] S1: Vacuumize the sampling tank, fill it with nitrogen, evacuate it, and then fill it with nitrogen, and repeat this cycle until the nitrogen in the sampling tank accounts for more than 99% of the gas in the tank; both vacuuming and nitrogen filling are carried out at room temperature; Keep the pressure at 0.2Mpa during nitrogen treatment;

[0047] S2: Vacuum the sampling tank and fill it with high-temperature hydrogen at 400°C; vacuum again and fill it with high-temperature hydrogen, and repeat this cycle until the hydrogen in the sampling tank accounts for more than 99% of the gas in the tank; the pressure when filling the hydrogen is 0.2Mpa;

[0048] S3: Fill the tank in S2 with high-temperature silane at 400°C until a silicon film with a thickness of 200nm is formed on the inner wall of the tank; keep the pressure at 0.2Mpa when filling the tank;

...

Embodiment 1C

[0051] The preparation process of the tank body is the same as in Example 1A, and the coating steps are as follows:

[0052] S1: Vacuumize the sampling tank, fill it with nitrogen, evacuate it, and then fill it with nitrogen, and repeat this cycle until the nitrogen in the sampling tank accounts for more than 99% of the gas in the tank; both vacuuming and nitrogen filling are carried out at room temperature; Keep the pressure at 0.6Mpa during nitrogen treatment;

[0053]S2: Vacuumize the sampling tank and fill it with high-temperature hydrogen at 600°C; evacuate again and fill it with high-temperature hydrogen, and repeat this cycle until the hydrogen in the sampling tank accounts for more than 99% of the gas in the tank; the pressure when filling hydrogen is 0.6Mpa;

[0054] S3: Fill the tank in S2 with high-temperature silane at 600°C until a silicon film with a thickness of 300nm is formed on the inner wall of the tank; keep the pressure at 0.6Mpa when filling the tank;

...

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Abstract

The invention belongs to the technical field of ambient air sampling devices, and particularly relates to a sampling tank for storing ambient air samples. The sampling tank is of an integrated sphere structure; a gas port and a valve corresponding to the gas port are arranged at the upper part of the sampling tank; a layer of silicon film is plated on the inner wall of the tank body, and the film plating method comprises the following steps: (1) vacuumizing the sampling tank, filling nitrogen, and repeating until the nitrogen content accounts for 99% or above; (2) filling high-temperature hydrogen until the hydrogen content accounts for 99% or above in the same way as that in the step (1); and (3) filling the treated tank body with high-temperature silane until a silicon film with the thickness of more than 200nm is formed on the inner wall of the tank body. The sampling tank provided by the invention adopts the specific silicon film layer which is subjected to passivation treatment, and the silicon film layer is high in passivation inertness and is suitable for storage of air samples containing sulfur and bromine components; the samples are not adsorbed in the tank body and the valve, so that the accuracy of the result is ensured; and the sampling tank is suitable for collecting various ambient air samples and is wide in application range.

Description

technical field [0001] The invention belongs to the technical field of ambient air sampling devices, and in particular relates to an ambient air sample sampling tank. Background technique [0002] Sampling bags are poor at collecting low concentrations (100 ppbv) of sulfur-containing VOCs, with samples changing in less than 24 hours. Sulfur components react with electropolished metal surfaces. Therefore, this sampling bag is not suitable for collecting and storing sulfur-containing VOC samples. [0003] Ordinary sampling tanks are used in complex ambient air sampling applications, which have the following difficult problems: [0004] Difficulty 1: Not resistant to corrosion, there will be a large amount of harmful components such as sulfide in industrial environments or explosion sites, which will combine with water molecules in the air to form corrosive substances, which will continue to erode the inner wall of the tank and generate new substances after interaction, mak...

Claims

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Application Information

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IPC IPC(8): F17C1/14C23C16/24C23C16/44
CPCF17C1/14C23C16/24C23C16/44F17C2201/0128F17C2209/23F17C2203/0643F17C2203/0641Y02E60/32
Inventor 赵永刚宋兴伟王荟梁霄李媛
Owner 赵永刚
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