Low-temperature gathering device and low-temperature gathering method capable of realizing synchronous gathering of H2/CH4/CO2/H2S

Abstract

The invention relates to a low-temperature gathering device and a low-temperature gathering method capable of realizing synchronous gathering of H2 / CH4 / CO2 / H2S. The device comprises a liquid nitrogen pump, a sleeve pipe, a temperature probe, heating rods, adsorbing hydrazine and adsorbents, wherein the liquid nitrogen pump can pump liquid nitrogen into the sleeve pipe; the adsorbing hydrazine is inserted into the sleeve pipe; the heating rods are positioned at both sides of the adsorbing hydrazine; the temperature probe is connected with the adsorbing hydrazine; the adsorbents are filled in the adsorbing hydrazine and are divided into three layers; silica wool is arranged among all layers of the adsorbents; and the adsorbents are sequentially a glass bead, a Tenax adsorbent and active carbon from top to bottom. The adsorbing hydrazine is reduced to -145+ / -5 DEG C by the liquid nitrogen pump, so that four gases are respectively absorbed by the three adsorbents synchronously; and the adsorbing hydrazine is heated to 190+ / -5 DEG C, so that the synchronous desorption of the four gases. The invention has simple structure, is easy to realize and can synchronously gather and preconcentrate the four tracing gases in the ocean and provide convenience for the following online analysis work.

Description

technical field [0001] The present invention relates to a kind of can realize H 2 / CH 4 / CO 2 / H 2 A cryogenic trapping device and method for simultaneous trapping of S. Background technique [0002] At present, the pretreatment methods for the analysis and testing of dissolved gases in seawater or river water mainly include static headspace method and purge and trap method. The headspace method is easy to operate, but the headspace method cannot concentrate the sample, and the test results for the gas with low content are not ideal. The emergence of purge and trap technology effectively overcomes the shortcomings of the static headspace method. The principle is to use the sweeping gas to sweep the sample, transfer the analyte from the liquid phase to the gas phase, and be carried into the trap by the sweeping gas for adsorption and trapping. According to different separation and enrichment goals, different adsorbents and adsorption conditions can be selected. The pur...

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Problems solved by technology

[0004] At present, for the purge and trap pre-concentration methods of dissolved gases in seawater, most of them select a certain adsorbent to adsorb one or two gases under certain adsorption conditions. 2 It is very difficult to accurately measure hydrogen in seawater because of its low concentration and its low boiling point, which makes it difficult to be adsorbed. In addition, many studies on the ocean are limited to individual gases in the ocean. Simultaneous testing of a variety of gases to explain multiple processes occurring in the ocean, the main reason is the lack of effective detection of multiple tracer gases H 2 、CH 4 , CO 2 、H 2 S pretreatment method for simultaneous capture and concentration

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