Preliminary study on direct measurements and diagnostics for chemical reaction dynamics of NOx by using laser wavelength modulation spectroscopy

Yongjian Li; Shuai Zhang; Jinyi Li; Xiaotao Yang; Yunfei Meng; Xu Liu; Zhenhui Du

doi:10.3788/COL202321.011202

Journals >Chinese Optics Letters >Volume 21 >Issue 1 >Page 011202 > Article

Chinese Optics Letters
Vol. 21, Issue 1, 011202 (2023)

Preliminary study on direct measurements and diagnostics for chemical reaction dynamics of NO_x by using laser wavelength modulation spectroscopy

Yongjian Li¹, Shuai Zhang¹, Jinyi Li², Xiaotao Yang³, Yunfei Meng¹, Xu Liu¹, and Zhenhui Du^1、*

Author Affiliations

¹State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China

²Tianjin Key Laboratory of Intelligent Control of Electrical Equipment, Tiangong University, Tianjin 300387, China

³College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China

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DOI: 10.3788/COL202321.011202 Cite this Article Set citation alerts

Yongjian Li, Shuai Zhang, Jinyi Li, Xiaotao Yang, Yunfei Meng, Xu Liu, Zhenhui Du. Preliminary study on direct measurements and diagnostics for chemical reaction dynamics of NO_x by using laser wavelength modulation spectroscopy[J]. Chinese Optics Letters, 2023, 21(1): 011202 Copy Citation Text

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Schematic diagram of the experimental system: (a) NOx measurement modulation waveform; (b) O2 measurement modulation waveform; (c) WMS-2f/1f signal of demodulated O2 absorption spectra; (d) WMS-2f/1f signal of demodulated NO and NO2 absorption spectra.

Fig. 1. Schematic diagram of the experimental system: (a) NO_x measurement modulation waveform; (b) O₂ measurement modulation waveform; (c) WMS-2f/1f signal of demodulated O₂ absorption spectra; (d) WMS-2f/1f signal of demodulated NO and NO₂ absorption spectra.

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Fitting results and residuals of WMS-2f/1f for NO2, NO, and O2 absorption spectra: (a) 0.14% relative root mean square (RMS) for the NO2 spectra; (b) 0.17% relative RMS for the NO spectra; (c) 0.21% relative RMS for the O2 spectra.

Fig. 2. Fitting results and residuals of WMS-2f/1f for NO₂, NO, and O₂ absorption spectra: (a) 0.14% relative root mean square (RMS) for the NO₂ spectra; (b) 0.17% relative RMS for the NO spectra; (c) 0.21% relative RMS for the O₂ spectra.

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Fig. 3. Measurement results of O₃ oxidizing NO reaction process: (a) temperature; (b) pressure; (c) NO₂ concentration; (d) NO concentration; (e) O₂ concentration; (f) O₃ concentration; (g) denitrification rate.

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Gas	Laser	Measurement Method	Wavenumber (cm⁻¹)	Detection Sensitivity (mol/L)
$O_{2}$	DBR, Photodigm	WMS-2f/1f	13142.6	$6.13 \times 10^{- 6}$
${NO}_{2}$	QCL, Hamamatsu	WMS-2f/1f	1629.85	$4.91 \times 10^{- 6}$
${NO}_{2}$	QCL, Hamamatsu	WMS-2f/1f	1630.33	$4.91 \times 10^{- 6}$
NO	QCL, Hamamatsu	WMS-2f/1f	1900.07	$1.06 \times 10^{- 5}$
$O_{3}$		Electrochemical	–	$4.09 \times 10^{- 6}$