CFD simulations of gate leaves design in the SCR-DeNOx facility for coal-fired power plant

Selective catalytic reduction (SCR) technology is the most common method to reduce NO_x emissions from coal-fired power plants. The design and development of SCR facilities is a complicate process involving the optimization of several parameters such as the strategy of ammonia injecting, the geometric design of gate leaf as well as the performance of the SCR monolith catalyst. Among them, the geometric design of gate leaf determines the uniform distributions of the ammonia concentration and the velocity at the entrance of the catalyst layer, which are the key factors to affect the efficiency of flue gas denitrification (DeNO_x) system and the catalyst life. In this work, three-dimensional CFD simulations are carried out for the SCR-DeNO_x facility of a 300 MW coal-fired power plant. The influence of the gate leaves at the turning and at the diameter variable on the distributions of the velocity and the concentration are investigated. The results of the optimal design of the gate leaves are shown as well.