In this study

the numerical simulation of the flue flow field in the selective catalytic reduction(SCR)reactor of a 1 000 MW boiler is carried out and the ammonia injection system is optimized. By using the Computational Fluid Dynamics module for fluid numerical simulation

the airflow distribution of the denitration system is analyzed and studied. Using partition type vortex ammonia injection optimized device

on the basis of the original denitration system

the flue section has realized the control of the ammonia injection by setting the double row eddy mixing device. This can significantly improve the uneven distribution of ammonia gas and the controllability of ammonia injection control so as to improve the denitration efficiency and reduce the ammonia escape. The optimization results show that the distribution deviation of NO_x concentration at the export of SCR reactor is greatly reduced

which verifies the effectiveness of the optimization scheme.