Numerical Simulation and Optimization of Flow Field in the SCR Denitrification System on a 600 MW Capacity Units

The fluid flow in the selective catalytic reduction (SCR) system of a 600MW power plant was simulated and optimized to reduce oxides of nitrogen(NOx) emanated from a coal-fired boiler. Some configuration parameters such as the location and number of guide plates as well as the shape of Mixer were modeled and studied numerically. It shows better effectiveness using the plate-type guide plate and disc-ring Mixer. The conversion of NOx increases from 67% to 96% with the increase of NH3/NOx, but decreases from 98% to 82% with the increase of velocity. The deviation of velocity distribution at the entrance to the catalyst bed and NH3 slip can satisfy the demand in Engineering.