Device and detection method for chromatography of CO, CH4 and CO2 ingredients in gas

Abstract

The invention discloses a device and a detection method for chromatography of CO, CH4 and CO2 ingredients in gas. The device and the detection method realize detection of a trace amount of CO, CH4 and CO2 in high-purity gas and detection of a trace amount of CO2 in other technical gas containing percent content of CH4 and a trace of CO2. Through cutting of a peak of CH4 of percent content, a small part of CH4 and CO2 is subjected to back-flushing secondary analysis so that a trace of CO2 is separated from CH4 of percent content and thus the problem that the spectral peak of the CH4 of percent content in the spectrogram covers the spectral peak of a trace of CO2 so that a trace of CO2 cannot be detected is solved. The device and the detection method develop an integral air passage application field, is not limited by only detection of a trace of an ingredient, can realize detection of a trace of an ingredient even if a background concentration is large and can be widely used for other air passages.

Description

technical field [0001] The invention relates to the field of gas chromatography analysis, in particular to a method for detecting CO, CH in gas 4 and CO 2 A device for component chromatographic analysis and a detection method thereof. Background technique [0002] In the methanol hydrogen production process project, in order to detect the purity of the final product high-purity hydrogen, it is necessary to detect the CO, CO 2 、CH 4 content, for high-purity hydrogen, the total content of these three impurities must be less than or equal to 10ppm. Normally, CO 2 The trace level is the content of several ppm levels. If the thermal conductivity detector is used to measure, it is impossible to detect CO 2 content. Therefore, it is generally detected by using a hydrogen flame detector (FID) plus a reformer. The hydrogen flame detector (FID) is a detector with a relatively high response to hydrocarbons. 2 converted to CH 4 , by measuring the converted CH 4 , indirect measu...

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Problems solved by technology

[0005] In view of this, the present invention provides a kind of CO, CH in high-purity gas 4 and CO 2 The gas chromatographic analysis device and its detection method can not only detect CO, CH in high-purity gas 4 and CO 2 It can also measure the percentage content of CH in other gases when they are all trace components. 4 and trace CO 2 Trace CO 2 Components are detected to solve the percentage content of CH in the spectrum 4 The spectral peak will trace CO 2 Spectrum peak coverage, unable to detect trace CO 2 The problem with testing

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