摘要：为研究选择性非催化还原法对分解炉中NO_x减排效果的影响, 采用计算流体力学方法对DDF型分解炉进行数值模拟。以尿素为还原剂设计选择性非催化还原脱硝方案, 对比分析各操作参数对NO_x减排效果的影响。结果表明, 还原剂喷射高度、喷嘴伸入距离、喷嘴数量等操作参数对NO_x减排效果的影响较大, 还原剂喷射速度对NO_x减排效果的影响较小, 且喷射高度为17 m, 喷嘴伸入距离为0~0.6 m, 喷嘴数量为4~8个, 还原剂喷射速度为50~70 m/s时, 分解炉中NO_x减排效果较好。

关键词：分解炉；NO_x 减排；数值模拟

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