Applications of optical measurement technology in pollution gas monitoring at thermal power plants

Jian Wang; Dahai Yu; Huajun Ye; Jianhu Yang; Liang Ke; Shuanglai Han; Haitao Gu; Yingbin Chen

doi:10.1117/12.917948

17 November 2011 Applications of optical measurement technology in pollution gas monitoring at thermal power plants

Jian Wang, Dahai Yu, Huajun Ye, Jianhu Yang, Liang Ke, Shuanglai Han, Haitao Gu, Yingbin Chen

Proceedings Volume 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 819702 (2011) https://doi.org/10.1117/12.917948
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

This paper presents the work of using advanced optical measurement techniques to implement stack gas emission monitoring and process control. A system is designed to conduct online measurement of SO₂/NO_X and mercury emission from stacks and slipping NH₃ of de-nitrification process. The system is consisted of SO₂/NOX monitoring subsystem, mercury monitoring subsystem, and NH₃ monitoring subsystem. The SO₂/NO_X monitoring subsystem is developed based on the ultraviolet differential optical absorption spectroscopy (UV-DOAS) technique. By using this technique, a linearity error less than ±1% F.S. is achieved, and the measurement errors resulting from optical path contamination and light fluctuation are removed. Moreover, this subsystem employs in situ extraction and hot-wet line sampling technique to significantly reduce SO₂ loss due to condensation and protect gas pipeline from corrosion. The mercury monitoring subsystem is used to measure the concentration of element mercury (Hg⁰), oxidized mercury (Hg²⁺), and total gaseous mercury (Hg^T) in the flue gas exhaust. The measurement of Hg with a low detection limit (0.1μg/m³) and a high sensitivity is realized by using cold vapor atom fluorescence spectroscopy (CVAFS) technique. This subsystem is also equipped with an inertial separation type sampling technique to prevent gas pipeline from being clogged and to reduce speciation mercury measurement error. The NH₃ monitoring subsystem is developed to measure the concentration of slipping NH₃ and then to help improving the efficiency of de-nitrification. The NH₃ concentration as low as 0.1ppm is able to be measured by using the off-axis integrated cavity output spectroscopy (ICOS) and the tunable diode laser absorption spectroscopy (TDLAS) techniques. The problem of trace NH₃ sampling loss is solved by applying heating the gas pipelines when the measurement is running.

Citation Download Citation

Jian Wang, Dahai Yu, Huajun Ye, Jianhu Yang, Liang Ke, Shuanglai Han, Haitao Gu, and Yingbin Chen "Applications of optical measurement technology in pollution gas monitoring at thermal power plants", Proc. SPIE 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 819702 (17 November 2011); https://doi.org/10.1117/12.917948

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