In this paper

SCR system is optimized and adjusted according to the problems of the low uniformity of outlet NO

X

concentrations and NO

x

large concentration deviation between the total discharge outlet and SCR outlet in 300 MW coal-fired power plant. The result shows that the relative standard deviations of NO

X

concentration distributions on both sides of A/B is reduced from 61. 56% to 15. 34% and from 69. 57% to 21. 84% respectively. Therefore

this optimization method has a good effect on the grid-spray ammonia mixing structure

thus effectively reducing SCR ammonia escape level

so as to ensure the long-term stable operation of the subsequent equipments.