SCR烟气脱硝系统喷氨优化实例分析

摘要

某电厂在没有增加第3层脱硝催化剂的情况下仅通过增加喷氨量降低NOx排放质量浓度，结果CEMS监测数据显示，SCR反应器出口烟道处与烟囱入口处的NOx质量浓度出现偏差，最高达30 mg/m3。通过对喷氨支管阀门进行优化调整，提高NOx和氨混合的均匀度，基本消除了NOx质量浓度偏差，经验可供同类型机组借鉴。%One power plant did not increase the third layer of NOx catalyst, just trying to increase the amount of ammonia spray, to reduce the NOx concentration, which caused that NOx concentration appearing serious deviation. The CEMS monitoring data, between SCR flue outlet NOx concentration and the chimney inlet of NOx concentration, showed that there was serious difference of 30 mg/m3. Based on the practical experience, this paper introduced how to improve the uniformity of NOx and NH3 by optimizing the operation mode, and to eliminate the deviation of NOx concentration. Experience could be used for the same type of unit.