Study on ammonia slip detection in the harsh combustion environments using diode laser spectroscopy

Kun You; Yu-jun Zhang; Hong-bin Li; Yin He; Yan-wei Gao; Li-ming Wang; Wen-qing Liu

doi:10.1117/12.2247319

25 October 2016 Study on ammonia slip detection in the harsh combustion environments using diode laser spectroscopy

Kun You, Yu-jun Zhang, Hong-bin Li, Yin He, Yan-wei Gao, Li-ming Wang, Wen-qing Liu

Proceedings Volume 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology; 101561R (2016) https://doi.org/10.1117/12.2247319
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China

Abstract

The emissions of NO_X from Cement plant or Coal-fired power plant have serious pollution to the environment. In recent years, Selective Catalytic Reduction (SCR) is an effective means of reducing the emissions of NO_X by injecting ammonia into the combustion flue gas, which ideally reacts with the NO_X to produce harmless components (H₂O and N₂). The efficiency of SCR is determined by monitoring the ammonia slip of the flue exhaust outlet, excess ammonia injection can cause ammonia slip, which not only destroy the plant, but also increase the operating costs. In addition, ammonia is also pollution gases as NO_X. The flue gas at the measurement point is high temperature, vibrate and high particle density processes in Cement plant primarily, such harsh conditions coupled with the highly reactive nature of ammonia, so it is difficult to reliable extractive low level analysis. The paper describes an in-situ Tunable Diode Laser analyzer for measuring ammonia slip in the combustion flue gas after SCR in Cement Plant or Coal-fired power plant. A correlation filtering algorithm is developed to select high-quality spectral absorption signal, which improve the accuracy of concentration inversion of analyzer. The paper also includes field test data on an actual Cement plant all day, and we compare the ammonia slip and NO_X emissions of flue gas during actual production process, the results indicate that the measured values of the ammonia slip and NO_X emissions present a good correlation and comply with the principle of SCR.

Citation Download Citation

Kun You, Yu-jun Zhang, Hong-bin Li, Yin He, Yan-wei Gao, Li-ming Wang, and Wen-qing Liu "Study on ammonia slip detection in the harsh combustion environments using diode laser spectroscopy", Proc. SPIE 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology, 101561R (25 October 2016); https://doi.org/10.1117/12.2247319

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