Device and method capable of separating hydrogen and methane in mixed gas and measuring hydrogen isotope

Abstract

The invention belongs to the field of oil gas geochemistry, and in particular to a device and method capable of separating hydrogen and methane in a mixed gas and measuring a hydrogen isotope. The device comprises a gas sample inlet, a drying unit, a hydrogen adsorption separation unit, a quantifying loop, a vacuum unit and an isotope measuring unit; and the gas sample inlet, the drying unit, thehydrogen adsorption separation unit, the quantifying loop and the isotope measuring unit are sequentially connected in series; the hydrogen adsorption separation unit can release adsorbed hydrogen tomeasure the hydrogen isotope, so that the methane and hydrogen in the mixed gas are separated, the separated hydrogen and methane are used for measure of the hydrogen isotopes respectively, and measure of the hydrogen isotope of the hydrogen and the hydrogen isotope of the methane in the hydrogen-methane mixed gas is realized; and the vacuum degree of the whole system is high, deviation caused bymutual interference between a hydrogen peak and a methane peak in the prior art is overcome, and accuracy of an analytical test is improved.

Description

technical field [0001] The invention belongs to the field of oil and gas geochemistry, and in particular relates to a device and a method for measuring hydrogen isotope in a mixed gas containing hydrogen and methane. Background technique [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 techno...

AI Technical Summary

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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