Optimization and Numerical Simulation of the Flow Characteristics in SCR System

Abstract

Selective Catalytic Reduction (SCR) DeNOx is the main flue gas denitrification technology, and the efficiency of SCR DeNOx system depends on whether the flue gas and ammonia distributions of the velocity and concentration fields are uniform in the reactor. Combined with the porous medium model and component transport equations, the numerical simulations were carried on for the SCR system of the 1000MW coal-fired station, and the velocity fields and concentration fields in different cases were obtained. The results showed that: the corner vane cascades and rectifier grills installed, the non-uniformity of flue gas velocity is less than 15% at the catalyst inlet within the reactor. Under the premise of the best flow field, the vortex mixers can ensure the full blending of the ammonia and flue gas in the reactor. The reliability of numerical simulation is verified through the cold model test, and then the design of the SCR system is guided effectively by the numerical simulations.