Numerical simulation and experimental verification of chemical reactions for SCR DeNO<sub><italic>x</italic>

doi:10.1007/s11705-010-0520-y

Front Chem Eng Chin

2010, Vol. 4

Issue (4) : 523-528 https://doi.org/10.1007/s11705-010-0520-y

RESEARCH ARTICLE

Numerical simulation and experimental verification of chemical reactions for SCR DeNO_x

Qiang ZHANG¹(

), Yonglin FAN², Wenyan LI²

1. Xi’an Thermal Power Research Institute Co. Ltd., Xi’an 710032, China; 2. North China Electric Power University, Beijing 102206, China

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Abstract

Selective catalytic reduction (SCR) is a major commercial technology for NO_x removal in power plants. There are a lot of complex chemical reactions in SCR reactors, and it is of great significance to understand the internal process of chemical reactions for SCR DeNO_x and study the impact of various factors on NO_x removal efficiency. In this paper, the impact of reaction temperature, ammonia-nitrogen molar ratio and resident time in the catalyst bed layer on NO_x removal efficiency were studied by simulation of chemical reactions. Then calculated results were compared with catalyst activity test data in a power plant, which proved that the simulated results were accurate. As a result, the reaction conditions were optimized in order to get the best removal efficiency of NO, so that we can provide a reference for optimal running of SCR in power plants.

Keywords SCR NO_x removal efficiency chemical reactions simulation

Corresponding Author(s): ZHANG Qiang,Email:zhangqiang@tpri.com.cn

Issue Date: 05 December 2010

Cite this article:

Qiang ZHANG,Yonglin FAN,Wenyan LI. Numerical simulation and experimental verification of chemical reactions for SCR DeNO_{x[J]. Front Chem Eng Chin,
2010, 4(4): 523-528.}

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-010-0520-y
https://academic.hep.com.cn/fcse/EN/Y2010/V4/I4/523

Tab.1 Components of inlet gas at the entrance of the catalyst bed

Fig.1 Mass fraction of NO in the catalyst bed at different reaction temperatures
(a) 285°C; (b) 305°C; (c) 325°C; (d) 345°C; (e) 365°C; (f) 385°C; (g) 405°C; (h) 425°C

Tab.2 Removal efficiency of NO at different reaction temperatures

Fig.2 Numerical simulation results of the removal efficiency of NO at different temperatures

Fig.3 Mass fraction of NO in the catalyst bed at different ammonia-nitrogen molar ratio
(a) 0.6; (b) 0.7; (c) 0.8; (d) 0.9; (e) 1.0

Fig.4 Numerical simulation results of NO removal efficiencies at different ammonia-nitrogen molar ratio

Fig.5 Mass fraction of NO in the catalyst bed at different resident times
(a) 0.2s; (b) 0.4s; (c) 0.6s; (d) 0.8s; (e) 1.0s

Fig.6 Numerical simulation results of NO removal efficiencies at different resident times

Fig.7 An activity test of catalysts in an experimental scale

Fig.8 Simulation results and experimental data of the NO removal efficiency at different temperatures

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