Correct optimization and adjustment on ammonia injection grid can ensure best performance of selective catalytic reduction system. Two layout forms of partition control AIG were introduced in this paper,horizontal layout and vertical layout. Taking one optimization experiment for vertical AIG of SCR device of 600 MW unit in some power plant as an ex-ample,a kind of AIG partition optimization and adjustment method was discussed based on symmetrical transfer principle for ammonia-air mixture which was to divide AIG area into 1 8 small areas for elaborate adjustment according to field situa-tion. Experiment indicated that by adjusting differences of ammonia spraying amount to realize coupling of differences of flow field distribution,it was able to make deviation coefficient of NOx concentration field in gas at reactor outlet reach a-bout 1 5% which might be effective to improve uniform distribution of NOx concentration field at the reactor outlet.%正确的喷氨格栅优化调整能确保选择性催化还原(selective catalytic reduction,SCR)系统发挥最佳性能。列举了分区域控制式喷射格栅的水平布置和垂直布置两种布置形式,以某电厂600 MW机组 SCR 装置垂直布置的喷氨格栅优化试验为例,在氨、空气混合物对称转移原则基础上探讨了一种喷氨格栅分区域优化调节的方法,根据现场实际情况把喷氨格栅区域分割成18个小区域进行精细化调整。试验表明通过调节喷嘴喷氨量之间的差异性来耦合流场分布的差异性可使反应器出口烟气中NOx 浓度场的偏差系数达到15%左右,对改善反应器出口的NOx 浓度场的均匀分布是有效的。
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