Fourier infrared spectrum detection device for high-humidity pollution gas

Abstract

The invention discloses a Fourier infrared spectrum detection device for high-humidity pollution gas. A water vapor spectrum with different water vapor concentration and close to target water vapor concentration is measured according to the work target water vapor concentration of the used drier; when a pollution gas spectrum is measured, the pollution gas passes through the drier repeatedly by adopting one inner circulation gas path design, the water vapor concentration of the pollution gas is reduced to be close to the target water vapor concentration of the drier, and the pollution gas spectrum at the moment is measured; two water vapor spectrums of the pre-measured water vapor spectrums with different water vapor concentration are automatically selected by a computer, the water vapor concentration of the two water vapor spectrums is closest to the water vapor concentration of the pollution gas and is higher and lower than the water vapor concentration of the pollution gas, and thewater vapor spectrum of the pollution gas is fitted by the two water vapor spectrums; and the water vapor spectrum is subtracted from the pollution gas spectrum, the water vapor absorbing peak in thepollution gas spectrum is eliminated, and gas pollutants with feature absorbing peak positioned in a water vapor area in the pollution gas are detected accurately.

Description

technical field [0001] The invention belongs to the technical field of pollution gas detection, and in particular relates to a Fourier transform infrared spectrum detection device for high-humidity pollution gas, which is based on the dehumidification design of the circulating gas circuit and the automatic fitting of the water vapor spectrum in the pollution gas by a computer, so as to eliminate the difference Water vapor absorption peaks in the spectrum of polluted gases to eliminate the influence of water vapor in the measurement of high-humidity polluted gases by Fourier transform infrared spectroscopy (such as NO x and SO 2 )Shortcomings. Background technique [0002] The detection of gas pollutants in exhaust emissions from pollution sources can provide an important law enforcement basis for the work of pollution discharge supervision departments, and can also provide effective effect evaluation for corporate pollution control work, which has important social significa...

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Problems solved by technology

[0008] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a Fourier transform infrared spectrum detection device for high-humidity polluting gases, when Fourier transform infrared spectroscopy is used to detect gas pollutants in high-humidity exhaust gases from pollution sources , without external supply of water vapor, nitrogen and adding a water vapor concentration monitoring device, to solve the problem of rapid detection of gas pollutants whose characteristic absorption peaks are located in the water vapor area, and thus propose a dehumidification method using a circulating air circuit to reduce the pollution of the gas The water vapor concentration is close to the target water vapor concentration of the dryer used. At the same time, the water vapor spectrum near the target water vapor concentration is measured in advance, and the spectrum of water vapor in the polluted gas is fitted by the computer, so as to subtract the polluted gas spectrum and remove the polluted gas spectrum. Water vapor absorption peaks, so that the characteristic absorption peaks of pollutants in the water vapor region of the pollution gas spectrum can be accurately identified and analyzed, and a more comprehensive and accurate detection of gas pollutants in high-humidity exhaust gases from pollution sources can be achieved

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