TY  - EJOU
AU  - Ai, Liang 
AU  - Li, Mingyue 
AU  - Chen, Lumin 
AU  - Gao, Yihua 
AU  - Sun, Yi 
AU  - Wu, Yue 
AU  - Qian, Fuping 
AU  - Lu, Jinli 
AU  - Huang, Naijin 

TI  - Numerical Study on the Influence of Rectifier Grid on the Performances of a Cement Kiln’s SCR (Selective Catalytic Reduction) Denitrification Reactor
T2  - Fluid Dynamics \& Materials Processing

PY  - 2025
VL  - 21
IS  - 5
SN  - 1555-2578

AB  - 
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 <i>k</i>/<i>H</i> ≥ 0.030, the rectifier grid height ratio <i>h</i>/<i>H</i> = 0.04, and the spacing between the rectifier grid and the first catalyst layer <i>l</i>/<i>H</i> = 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.
KW  - Cement kiln flue gas; SCR denitrification reactor; rectifier grid; denitrification efficiency; structure optimization

DO  - 10.32604/fdmp.2025.055985