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Proceedings Paper

Study on ammonia slip detection in the harsh combustion environments using diode laser spectroscopy
Author(s): Kun You; Yu-jun Zhang; Hong-bin Li; Yin He; Yan-wei Gao; Li-ming Wang; Wen-qing Liu
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Paper Abstract

The emissions of NOX 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 NOX by injecting ammonia into the combustion flue gas, which ideally reacts with the NOX 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 NOX. 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 NOX emissions of flue gas during actual production process, the results indicate that the measured values of the ammonia slip and NOX emissions present a good correlation and comply with the principle of SCR.

Paper Details

Date Published: 25 October 2016
PDF: 8 pages
Proc. SPIE 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology, 101561R (25 October 2016); doi: 10.1117/12.2247319
Show Author Affiliations
Kun You, Anhui Institute of Optics and Fine Mechanics (China)
Yu-jun Zhang, Anhui Institute of Optics and Fine Mechanics (China)
Hong-bin Li, Anhui Institute of Optics and Fine Mechanics (China)
Yin He, Anhui Institute of Optics and Fine Mechanics (China)
Yan-wei Gao, Anhui Institute of Optics and Fine Mechanics (China)
Li-ming Wang, Anhui Institute of Optics and Fine Mechanics (China)
Wen-qing Liu, Anhui Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 10156:
Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology

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