Method and device for monitoring methane or non-methane hydrocarbon

Abstract

The invention relates to the field of gas monitoring, and discloses a method and a device for monitoring methane or non-methane hydrocarbon. The method comprises the steps of (1) filling a total hydrocarbon detector with standard gas, and establishing a total hydrocarbon concentration curve; enabling the standard gas to pass through a catalytic oxidation device, then filling a methane detector with the standard gas, and establishing a methane concentration curve; (2) heating sample gas, and then filling the total hydrocarbon detector with the heated sample gas; heating the to-be-detected sample gas, enabling the heated sample gas to pass through the catalytic oxidation device, and then filling the methane detector with the sample gas; (3) obtaining the concentration value of total hydrocarbon and the concentration value of methane, namely, the concentration value of the non-methane hydrocarbon in the sample gas according to the step (1) and the step (2). The catalytic oxidation device is used for oxidizing all hydrocarbon gases except the methane in the gas into water and carbon dioxide, so that the concentration signal of the methane can be directly detected; the method has the advantage of detecting the methane or the non-methane hydrocarbon in the gas in real time, and is convenient and simple in data processing, thus having very high market competitiveness and application value.

Description

Technical field [0001] The invention relates to the field of gas monitoring, in particular to a method and device for monitoring methane and non-methane total hydrocarbons. Background technique [0002] In recent years, due to the rapid development of the domestic economy, the acceleration of industrialization and urbanization, the number of motor vehicles has increased sharply. The main sources of volatile organic compounds such as petrochemicals, automobiles, home appliances, fine chemicals and other industries have grown rapidly. The use of volatile organic solvents Large, resulting in large emissions of volatile organic compounds (VOCs). VOCs refer to various organic compounds with a boiling point of 50°C to 260°C at room temperature. According to their chemical structure, VOCs can be further divided into: alkanes, aromatic hydrocarbons, esters, aldehydes and others. At present, more than 300 kinds have been identified. The most common ones are benzene, toluene, xylene, sty...

AI Technical Summary

Problems solved by technology

However, this monitoring method has the following disadvantages: because the monitoring method needs to separate the methane in the total hydrocarbons through a chromatographic column, the purpose of monitoring the methane concentration can be realized, which makes there is a certain discontinuity in the time of monitoring methane and non-methane , leading to problems such as inaccurate monitoring data

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