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Gas analyzing method and apparatus

A gas analysis and gas technology, applied in the direction of analysis materials, instruments, etc., can solve the problems of long-term sensitivity decline, short service life, poisoning, etc., and achieve the effect of accurate and reliable measurement results

Inactive Publication Date: 2007-06-13
SHANGHAI GASOLINEEUM & CHEM EQUIP +1
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Problems solved by technology

However, various methods have their disadvantages: if hydrogen is measured with a thermal conductivity detector, it must be separated first, otherwise there will be interference with other gases; if electrochemical sensors and semiconductor sensors are used for measurement, there is poisoning , short service life, long-term sensitivity drop and other problems, it is not suitable for long-term environmental monitoring applications
In addition, hydrogen molecules are non-infrared active molecules, so they cannot be measured by non-dispersive infrared methods with strong safety and reliability

Method used

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  • Gas analyzing method and apparatus
  • Gas analyzing method and apparatus

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Embodiment Construction

[0033] Please refer to FIG. 2 , which is a flowchart of the present invention. As shown, the present invention includes an injection valve 21 , a detector 22 connected to the injection valve 21 , and a data processing system 23 connected to the detector 22 . The detector 22 includes a thermal conductivity detector 221 , a carbon dioxide infrared gas sensor 222 and a methane infrared gas sensor 223 , and they are connected in series.

[0034] Based on the gas analysis method of above-mentioned device, its step comprises:

[0035] (1) Determine the response curve of each detection instrument (response curve reflects the relationship between gas concentration and voltage), which includes:

[0036] Use pure carbon dioxide gas and air to prepare the mixed gas of different ratio concentrations as the sample gas and bring it into the measurement flow path by the injection valve 21, and determine the response curve of carbon dioxide gas on the thermal conductivity detector 221 (such ...

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Abstract

The invention relates to a gas analyzing method that could test the thickness of hydrogen, methane and carbon dioxide in mix gas. It includes the following steps: determining the responding curve of detecting instruments, testing the gas thickness in mixed gas. The gas analyzing instrument includes filling valve, and data process system. The advantages of the invention are that it could test the thickness of mix gas at same time and the result is accurate and reliable.

Description

technical field [0001] The invention relates to a gas analysis method, in particular to a gas analysis method capable of simultaneously measuring the concentrations of hydrogen, methane and carbon dioxide in a mixed gas. Background technique [0002] The gas detection analysis method commonly used in the prior art is a gas chromatography analysis method, which can analyze the concentration of various gases such as hydrogen and carbon dioxide in the mixed gas. As shown in FIG. 1 , the gas chromatography analysis method usually adopts a chromatographic column 14 and a thermal conductivity detector 12 for separation and detection. The gas to be tested is cut into the gas path through the switching valve 11, and the gas to be tested cut into the gas path is brought into the chromatographic column 14 with the carrier gas, and the gas to be tested is separated by using the different separation characteristics of the components to be measured in the gas to be measured , the separa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N35/00
Inventor 顾正赵要强
Owner SHANGHAI GASOLINEEUM & CHEM EQUIP
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