Quantitative analysis of SO2, H2S and CS2 mixed gases based on ultraviolet differential absorption spectrometry

Zhaolun Cui; Xiaoxing Zhang; Zheng Cheng; Yalong Li; Hai Xiao

doi:10.1016/j.saa.2019.01.075

Quantitative analysis of SO₂, H₂S and CS₂ mixed gases based on ultraviolet differential absorption spectrometry

Spectrochim Acta A Mol Biomol Spectrosc. 2019 May 15:215:187-195. doi: 10.1016/j.saa.2019.01.075. Epub 2019 Jan 28.

Authors

Zhaolun Cui¹, Xiaoxing Zhang², Zheng Cheng³, Yalong Li¹, Hai Xiao⁴

Affiliations

¹ School of Electrical Engineering, Wuhan University, Wuhan 430072, China.
² School of Electrical Engineering, Wuhan University, Wuhan 430072, China. Electronic address: xiaoxing.zhang@outlook.com.
³ State Grid Electric Power Company of Chongqing Yongchuan, 402160, China.
⁴ Department of Electrical and Computer Engineering, Center for Optical Material Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA.

PMID: 30825866
DOI: 10.1016/j.saa.2019.01.075

Abstract

SO₂, H₂S and CS₂ are the decomposition components of insulating gas SF₆. The detection of these gases is significant for the online monitoring and fault diagnosis of SF₆ electrical equipment. In this study, an ultraviolet differential optical absorption spectrometry (UV-DOAS) platform for detecting the concentration of SO₂, H₂S and CS₂ mixed gases was established and a quantitatively detecting method was proposed. Firstly, the concentration of SO₂ was calculated by the spectrum data at 300 nm band. Then the gas mixture spectra of H₂S and CS₂ at 200 nm band were obtained after linear deduction of SO₂ spectrum. By wavelet extraction and fourier transform, the spectral information of H₂S and CS₂ was separated and the concentrations of the two gases were calculated. The method can detect the concentrations of SO₂ (1-20 ppm), H₂S (1-20 ppm) and CS₂ (0.01-2 ppm) ternary gas mixture and the detection limits of SO₂, H₂S and CS₂ are 0.44 ppm, 0.49 ppm and 3.23 ppb. This method has good detection sensitivity and high detection precision, which is suitable for the on-line monitoring of SF₆ gas insulated equipment.

Keywords: CS(2); H(2)S; Quantitative detection; SF(6); SO(2); UV-DOAS.