A device and method capable of separating hydrogen and methane in a mixed gas and measuring hydrogen isotopes

Abstract

The invention belongs to the field of oil and gas geochemistry, and specifically relates to a device and method for separating hydrogen and methane in a mixed gas and measuring hydrogen isotopes, including a gas sampling port, a drying unit, a hydrogen adsorption separation unit, a quantitative loop, a vacuum unit and Isotope determination unit; the gas inlet, drying unit, hydrogen adsorption separation unit, quantitative loop and isotope determination unit are connected in series in sequence; the hydrogen adsorption separation unit can release the adsorbed hydrogen for hydrogen isotope determination, thereby separating and mixing Methane and hydrogen in the gas, and the test of hydrogen isotope respectively, realize the determination of hydrogen hydrogen isotope and methane hydrogen isotope in hydrogen-methane mixture gas, the vacuum degree of the whole system is high, overcome the hydrogen peak and methane in the prior art The deviation generated by the mutual interference between the peaks improves the accuracy of the analytical test.

Description

technical field [0001] The invention belongs to the field of oil and gas geochemistry, and in particular relates to a device and method for hydrogen isotope determination of a mixed gas containing hydrogen and methane. Background technique [0002] Since natural gas such as coalbed methane, most of the source rock thermal simulation gas, and hot spring gas in some areas contains both hydrogen, methane and other gases, different types of chromatographic columns or different types of chromatographic columns should be used in the determination of hydrogen isotopes. It is difficult to completely separate them under the chromatographic conditions, resulting in the mutual interference between the hydrogen peak and the methane peak, resulting in serious distortion of the parameters such as the peak height and peak area of ​​the hydrogen peak and the methane peak, and the hydrogen isotope ratio of hydrogen and methane is relatively high. big deviation. The traditional separation me...

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Problems solved by technology

[0002] Since natural gas such as coalbed methane, most source rock thermal simulation gases, and hot spring gas in some areas contains hydrogen, methane and other gases, when performing hydrogen isotope determination, use different types of chromatographic columns or select different It is difficult to completely separate the chromatographic conditions, thus causing the mutual interference between the hydrogen peak and the methane peak, resulting in serious distortion of the parameters such as the peak height and the peak area of ​​the hydrogen peak and the methane peak, and making the hydrogen isotope ratio of hydrogen and methane relatively different. big deviation

The traditional separation method is to use cold trap and vacuum technology to enrich hydrogen by circulating liquefaction to test its hydrogen isotope. The systematic error brought about has yet to be confirmed

Therefore, in the current research on gas geochemistry at home and abroad, there are still some difficulties in the separation of hydrogen and methane in the mixed gas and the determination of their respective hydrogen isotopes.

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