Mr. Gang Zhou Profile

Gang Zhou

at China National Environmental Monitoring Ctr.

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Proceedings Article | 20 January 2023 Paper

Research on NMHC online monitoring based on laser absorption spectroscopy and hydrogen flame ionization detection technology

Lifu Liu, Gang Zhou, Lei Wang, Yuxuan Feng, Qiang Wu

Proceedings Volume 12558, 1255803 (2023) https://doi.org/10.1117/12.2645555

KEYWORDS: Absorption spectroscopy, Ionization, Modulation, Methane, Ions

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In view of the current problems in online monitoring of non-methane total hydrocarbons (NMHC) in the exhaust gas from stationary sources, the study is based on the combination of tunable diode laser absorption spectroscopy (TDLAS) and hydrogen flame ionization detection (FID) technology in online monitoring of NMHC. The online measurement of trace methane content is realized by using a laser with a center wavelength near 1653.7 nm and a design based on the White-type multiple reflection absorption cell. At the same time, a heated FID detector is used to measure the total hydrocarbon (THC) content, and the NMHC concentration can be calculated through the detection of the total hydrocarbon and methane content. Measured (0-207) mg/mg³ NMHC system in laboratory and obtained NMHC linearity error of -0.59%F.S., with a repeatability and detection limit of 0.45% and 0.05 mg/m³ respectively, with advantages of low detection limit and good repeatability, high linearity, and strong anti-interference ability, etc., it meets the requirements of NMHC online monitoring applied to exhaust gas of stationary pollution sources.

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