An underwater gas chromatography system capable of in-situ testing of H2 and CH4 gases in seawater and its operation method

Abstract

The invention relates to an underwater gas chromatography system for realizing in-situ test for H2 and CH4 in seawater and an operation method thereof. The underwater gas chromatography system comprises a seawater automatic sampling and gas membrane extracting unit, a multi-component gas automatic detecting and self-correcting unit and an exhaust gas recovering unit, wherein the seawater automatic sampling and gas membrane extracting unit is mounted on an instrument cabin end cover; the multi-component gas automatic detecting and self-correcting unit and the exhaust gas recovering unit are packaged in a high-pressure sealing instrument cabin; the seawater automatic sampling and gas membrane extracting unit is used for separating and extracting gas from a seawater sample and the gas is applied to the subsequent assay determination of a gas automatic detection device; the multi-component gas automatic detecting and self-correcting unit is used for quantitatively analyzing and determining the content of the gas in the seawater by using a pulse helium ionization detector; the exhaust gas recovering unit is used for storing the exhaust gas discharged from the system in an exhaust gas bottle, keeping the system pressure within a suitable numerical range and ensuring the normal running of all functional components in the system. According to the invention, the gas chromatographic technique is applied to underwater position and can be used for performing underwater accurate in-situ test on various dissolvable gases in deep sea and truly reflecting the content of the in-situ gases on seabed.

Description

technical field [0001] The invention belongs to the technical field of gas chromatographic analysis, in particular to a method capable of realizing H in seawater 2 、CH 4 An underwater gas chromatography system for in-situ testing of gases and its operating method. Background technique [0002] Submarine hydrothermal activities will eject a large amount of CH 4 、H 2 , CO 2 and other gases, the disturbed decomposition of natural gas hydrate will also release a large amount of CH 4 and other hydrocarbon gases, resulting in abnormally high content distribution of these tracer gases in seawater. By quickly detecting and tracking the abnormal distribution characteristics of these tracer gases, it can provide a fast and effective scientific basis for finding and reasonably evaluating resources such as seabed hydrothermal sulfides and gas hydrates. At the same time, CH in the ocean 4 、H 2 and CO 2 Gas and other gases are also an important source of energy for organisms, and...

AI Technical Summary

Problems solved by technology

[0003] Judging from the current testing methods of deep-sea gas, most of them use shipboard system sampling and then analysis. At present, there are few devices that can detect gas in situ in the deep-sea high-pressure environment, and some sensor technologies are more mature. As a gas An important means of testing - gas chromatography technology has not yet achieved underwater in-situ detection

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