Device for measuring He abundance and measuring method thereof

A concentration and strength technology, applied in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of helium abundance error, small helium, and large detection error of low-abundance helium. Accuracy and repeatability, overcome large measurement errors, and achieve the effect of precise testing

Pending Publication Date: 2020-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the abundance of helium in natural gas is often low, how to accurately determine the abundance of helium has become a common concern
[0003] At present, chromatography has been used to test the abundance of helium in natural gas, and an inert gas isotope mass spectrometer is used to analyze and test the abundance of He, which is expensive.
However, the existing inert gas mass spectrometer to measure the abundance of helium often adopts the method of purifying the natural gas first and then injecting the sample. The proportion of helium in the actual natural gas is relatively small, and the helium in the purified gas The amount is small, when even a small deviation occurs in the thin film vacuum gauge, it will cause a large error in the final helium abundance
[0004] When the inert gas abundance is low, due to the low electrical signal in the ion source, the accuracy of its analysis and testing is significantly reduced, so conventional inert gas isotope mass spectrometers often have large errors in the detection of low-abundance helium
In addition, the abundance test range of inert gases is relatively small, and helium enters the dual-channel system of the stable isotope mass spectrometer through diffusion, and its diffusion distance in the pipeline is long, resulting in further attenuation of the helium signal, while natural gas The abundance of helium is often small, so it is of great significance to find an analysis and testing instrument that can achieve low helium abundance.

Method used

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  • Device for measuring He abundance and measuring method thereof
  • Device for measuring He abundance and measuring method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 A kind of device for measuring He abundance

[0047] Such as figure 1 As shown, the new stable isotope mass spectrometry device for determining the abundance of He is composed of a molecular pump 1, a vacuum valve 1, 2, an injection port 3, a gas purification chamber 4, a vacuum valve 2 5, a vacuum valve 5 6, and a vacuum valve 4 7. Compression chamber 8, vacuum valve three 9, vacuum valve six 10, and ion source 11.

[0048] The molecular pump 1 is connected to the gas purification chamber 4 through a pipeline, and one end of the gas purification chamber 4 is connected to the ion source 11 through a pipeline, and a Faraday cup is arranged in the ion source 11; a vacuum valve is arranged between the molecular pump 1 and the gas purification chamber 4 12. The pipeline between the gas purification chamber 4 and the ion source 11 is provided with a vacuum valve 2 5 and a vacuum valve 3 9 in sequence. A vacuum valve 5 6 and a vacuum valve 5 6 are arranged betwe...

Embodiment 2

[0058] Embodiment 2 A kind of low-abundance He detection method

[0059] Helium concentration to be measured -5 (V / V), adopt the method described below to detect He abundance, and described method comprises:

[0060] (1) Open molecular pump 1, close vacuum valve one 2, vacuum valve two 5, vacuum valve five 6, vacuum valve four 7 and vacuum valve three 9, and remove gas in the pipeline;

[0061] (2) When the vacuum reaches 10 -9 At mBar, disconnect vacuum valve 1 2, vacuum valve 2 5 and vacuum valve 3 9;

[0062] (3) Get the standard sample from the sample inlet 3 and enter the reaction pipeline through the gas purification chamber 4;

[0063] (4) Close the vacuum valve two 5, wait for the inert gas to diffuse into the compression chamber 8, disconnect the vacuum valve five 6;

[0064] (5) Close the vacuum valve 3 9, and read the electron current intensity value A1 through the ion source;

[0065] (6) Take the sample to be tested, repeat the above steps 1-5, and read the io...

Embodiment 3

[0072] Embodiment 3 A kind of low-abundance He detection method

[0073] Helium concentration to be measured -5 (V / V), adopt the method described below to detect He abundance, and described method comprises:

[0074] (1) Open molecular pump 1, close vacuum valve one 2, vacuum valve two 5, vacuum valve five 6, vacuum valve four 7 and vacuum valve three 9, and remove gas in the pipeline;

[0075] (2) When the vacuum degree reaches 10 -9 At mBar, disconnect vacuum valve 1 2, vacuum valve 2 5 and vacuum valve 3 9;

[0076] (3) Get the standard sample from the sample inlet 3 and enter the reaction pipeline through the gas purification chamber 4;

[0077] (4) Close the vacuum valve two 5, wait for the inert gas to diffuse into the compression chamber 8, disconnect the vacuum valve five 6;

[0078] (5) Close the vacuum valve 3 9, and read the electron current intensity value A1 through the ion source;

[0079] (6) Take the sample to be tested, repeat the above steps 1-5, and read...

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Abstract

The invention belongs to the technical field of analysis and testing of inert gas in natural gas, and particularly relates to a device for measuring the abundance of He in natural gas and a measuringmethod thereof. The device comprises a molecular pump, a vacuum valve, a gas purification chamber, a vacuum valve, a compression chamber and an ion source, the molecular pump is connected with the gaspurification chamber through a pipe; one end of the gas purification chamber is connected with an ion source through a pipe, and a Faraday cup is arranged in the ion source; a first vacuum valve is arranged between the molecular pump and the gas purification chamber; a second vacuum valve and a third vacuum valve are sequentially arranged on a pipe between the gas purification chamber and the ionsource; a branch pipe is arranged between the second vacuum valve and the third vacuum valve and connected with the compression chamber through a fourth vacuum valve. According to the device, the effective testing of low-abundance helium is realized, and the accuracy and repeatability of testing of different helium abundance are ensured.

Description

technical field [0001] The invention belongs to the technical field of analysis and testing of inert gas in natural gas, and in particular relates to a device for measuring He abundance and a measurement method thereof. Background technique [0002] In geological applications, the abundance of the rare gas helium has become an important indicator, which is used in the identification of the origin of natural gas, the exchange of crust-mantle materials, and the study of terrestrial heat flow. However, the abundance of helium in natural gas is often low, and how to accurately measure the abundance of helium has become a common concern. [0003] At present, chromatography has been used to test the abundance of helium in natural gas, and an inert gas isotope mass spectrometer is used to analyze and test the abundance of He, which is expensive to analyze. However, the existing inert gas mass spectrometer to measure the abundance of helium often adopts the method of purifying the ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor翟正曹忠祥王学军李祥臣綦艳丽鲍燕陶军明韩冬梅林晶王大洋
OwnerCHINA PETROLEUM & CHEM CORP