Abstract：In order to study the effect of NO_x emission reduction by selective non-catalytic reduction method in precalciner, computational fluid dynamics method was used to simulated the DDF precalciner. The selective non-catalytic reduction denitration scheme was designed with urea as reducing agent, and the effects of NO_x emission reduction on different operating parameters were compared and analyzed. The results show that the operation parameters of injection height of reducing agent, into distance and number of nozzle have great influence on NO_x emission reduction, the effect of the injection speed of the reducing agent is small.When injection height of reducing agent is 17 m, into distance of nozzle is 0~0.6 m, number of nozzle is 4~8, injection speed of the reducing agent is 50~70 m/s, the effect of NO_x emission reduction is better in precalciner.

Keywords: precalciner; NO_x emission reduction; numerical simulation