Non-methane hydrocarbon online detector

Abstract

The invention discloses a non-methane hydrocarbon online detector, comprising a dust removal filter, a dryer, a zero gas generator, a sampling channel I, a change-over valve, a capillary blank pipe, a methane molecular sieve and a hydrogen flame ionization detector. The sampled gas goes through the dust removal filter to remove dust, afterwards, goes through the dryer to remove moisture in a sample gas, and then goes through the zero gas generator to remove acid-base exhaust in a gas to be detected; the gas subjected to pretreatment is led to the sampling channel I and the change-over valve, and reaches the capillary blank pipe and the methane molecular sieve respectively through the transportation of a carrier gas; the methane molecular sieve only allows methane to pass; and the gas to be detected is ionized into carbocations and electrons in the hydrogen flame ionization detector, forms a microcurrent under the action of an electric field, and forms output signals through amplification. Therefore, shortening the test time of non-methane hydrocarbon is achieved, and meanwhile, the accuracy of detection is improved; and the non-methane hydrocarbon online detector further has the advantages that multiple gases can be detected, the structure is simple, the sensitivity is high and the operating cost is low.

Description

technical field [0001] The invention relates to the technical field of detection of total non-methane hydrocarbons, in particular to an online detection device for total non-methane hydrocarbons. Background technique [0002] With the rapid development of the economy, various environments emerge in endlessly, especially in recent years, various severe and extreme weathers have occurred, which has attracted widespread attention. The country has paid enough attention to it, so now volatile organic compounds are an important work in environmental monitoring. [0003] Volatile organic compounds (VOCs) come from a wide range of sources, including primary pollutants from fossil fuel combustion and motor vehicle emissions, and secondary pollutants produced by photochemical reactions. Studies have shown that the temporal and spatial distribution of VOCs in the atmospheric environment is closely related to the emission characteristics of its pollution sources, meteorological conditi...

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