Abstract The fluid flow in a selective catalytic reduction (SCR) system of a 600?MW power station is optimized using the numerical simulation method in this work. Given that guide plates and straightening gratings are properly installed, the relative standard deviation (Cv) of velocity related to the inlet of an ammonia injection grid (AIG) and catalysts satisfy the engineering demand of?<15%, suggesting that a relatively uniform velocity field is obtained. The in-line arrangement of static mixers strengthens the disturbance of fluid, promoting the mixing of reductant NH3 with flue gas. The NH3 mole fraction Cv value correlated to the inlet of catalysts drops to ca. 3.5%, which is lower than that in the cases when the mixers are aligned in a staggered style. These results indicate that a solid foundation is achieved for the effective abatement of NOx in practical applications.
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