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Article

TDLAS Monitoring of Carbon Dioxide with Temperature Compensation in Power Plant Exhausts

by 1,3, 1,3,*, 2, 1,3 and 1,3
1
School of Electric Power, South China University of Technology, Guangzhou 510640, China
2
Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong SAR 2912, China
3
Guangdong Province Engineering Research Center of High Efficiency and Low Pollution Energy Conversion, Guangzhou 501640, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(3), 442; https://doi.org/10.3390/app9030442
Received: 7 January 2019 / Revised: 24 January 2019 / Accepted: 24 January 2019 / Published: 28 January 2019
(This article belongs to the Special Issue State-of-the-art Laser Gas Sensing Technologies)
Temperature variations of flue gas have an effect on carbon dioxide (CO2) emissions monitoring. This paper demonstrates accurate CO2 concentration measurement using tunable diode laser absorption spectroscopy (TDLAS) with temperature compensation methods. A distributed feedback diode laser at 1579 nm was chosen as the laser source for CO2 measurements. A modeled flue gas was made referring to CO2 concentrations of 10–20% and temperatures of 298–338 K in the exhaust of a power plant. Two temperature compensation methods based on direct absorption (DA) and wavelength modulation (WMS) are presented to improve the accuracy of the concentration measurement. The relative standard deviations of DA and WMS measurements of concentration were reduced from 0.84% and 0.35% to 0.42% and 0.31%, respectively. Our experimental results have validated the rationality of temperature compensations and can be further applied for high-precision measurement of gas concentrations in industrial emission monitoring. View Full-Text
Keywords: carbon dioxide monitoring; absorption spectroscopy; temperature compensation; wavelength modulation carbon dioxide monitoring; absorption spectroscopy; temperature compensation; wavelength modulation
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MDPI and ACS Style

Zhu, X.; Yao, S.; Ren, W.; Lu, Z.; Li, Z. TDLAS Monitoring of Carbon Dioxide with Temperature Compensation in Power Plant Exhausts. Appl. Sci. 2019, 9, 442. https://doi.org/10.3390/app9030442

AMA Style

Zhu X, Yao S, Ren W, Lu Z, Li Z. TDLAS Monitoring of Carbon Dioxide with Temperature Compensation in Power Plant Exhausts. Applied Sciences. 2019; 9(3):442. https://doi.org/10.3390/app9030442

Chicago/Turabian Style

Zhu, Xiaorui, Shunchun Yao, Wei Ren, Zhimin Lu, and Zhenghui Li. 2019. "TDLAS Monitoring of Carbon Dioxide with Temperature Compensation in Power Plant Exhausts" Applied Sciences 9, no. 3: 442. https://doi.org/10.3390/app9030442

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