Open Access

ARTICLE

Numerical Study on the Influence of Rectifier Grid on the Performances of a Cement Kiln’s SCR (Selective Catalytic Reduction) Denitrification Reactor

Liang Ai¹, Mingyue Li², Lumin Chen¹, Yihua Gao², Yi Sun¹, Yue Wu¹, Fuping Qian^1,*, Jinli Lu², Naijin Huang³

1 School of Energy and Environment, Anhui University of Technology, Ma’anshan, 243002, China
2 School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan, 243002, China
3 Anhui Weida Environment Protection Science &Technology Co., Ltd., Hefei, 230041, China

* Corresponding Author: Fuping Qian. Email:

Fluid Dynamics & Materials Processing 2025, 21(5), 1171-1190. https://doi.org/10.32604/fdmp.2025.055985

Received 11 July 2024; Accepted 13 December 2024; Issue published 30 May 2025

Abstract

In this study, Computational Fluid Dynamics (CFD) together with a component transport model are exploited to investigate the influence of dimensionless parameters, involving the height of the rectifier grid and the installation height of the first catalyst layer, on the flow field and the overall denitration efficiency of a cement kiln’s SCR (Selective catalytic reduction) denitrification reactor. It is shown that accurate numerical results can be obtained by fitting the particle size distribution function to the actual cement kiln fly ash and implementing a non-uniform particle inlet boundary condition. The relative error between denitration efficiency derived from experimental data, numerical simulation, and real-time system pressure drop ranges from 4% to 9%. Optimization of the SCR reactor is achieved when the rectifier grid thickness ratio k/H ≥ 0.030, the rectifier grid height ratio h/H = 0.04, and the spacing between the rectifier grid and the first catalyst layer l/H = 0.10. Under these conditions, airflow distribution and particle dispersion upstream of the catalyst result in increased denitration efficiencies of 3.21%, 3.43%, and 3.27%, respectively, compared to the least favorable operating conditions.

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Keywords

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