水泥炉窑烟气脱硝控制系统优化设计  

Optimal design of denitrification process control system for cement kiln flue gas

作　　者：周荣[1] 周敏捷[1] 韦彦斐[1] 郑建兵 

机构地区：[1]浙江省环境保护科学设计研究院,浙江杭州310007 [2]浙江环茂自控科技有限公司,浙江杭州310012

出　　处：《水泥》2017年第12期51-56,共6页Cement

基　　金：水泥炉窑SCR脱硝合作研发和成果转化(2016F50026)

摘　　要：水泥炉窑SNCR烟气脱硝工程一旦投入运行,其初始NO_x浓度([NO_x]_1)信号丢失,而[NO_x]_1是氨水流量计算的核心输入参数,若不能获取该数据并根据工况波动及时调整,常会导致喷氨过量或是喷氨不足,甚至控制失灵。但是[NO_x]_1的输入和跟踪一直是SNCR脱硝控制的难点和研究的空白。研究表明:在理论计算公式基础上,通过初始赋值[NO_x]_0,借助工况判定和增量Δ可做到[NO_x]_1实时调整。2种正常工况下,氨水流量计算值SV直接指导氨水供给,2种异常工况出现时变量Δ对[NO_x]_1进行反复修正计算和判定,直至工况恢复正常。4种模拟工况情景分析表明,引入判定条件和变量Δ修正[NO_x]_1的控制方法可以适应各种工况波动;应用到实际工程,控制系统优化后系统的稳定性、灵敏性都得到提高,降低了运行成本。The initial NOx concentration （[NOx]1） signal would lost when the SNCR denitrification system put into operation. The [NOx]1 value was a key input data for ammonia flow calculation, without it and adjustment according to fluctuation of operating conditions, the ammonia injection would be excessive or insufficient, even leading to out of control. [NOx]1 input and tracking was always difficult and relevant research still remained empty. The research showed that based on the theoretical calculating formula, [NOx]1 could be real-time adjusted by means of working condition judgement and increment through the initial assigned value [NOx]0. In the two normal working conditions, SV valve could guide ammonia supply directly, while in the two abnormal working conditions, the judging criteria and variant A would modify [NOx]1 until the working condition returned to normal. The above four simulated condition showed the methods that using judging criteria and variant to modify [NOx]1 could adapt for working conditions fluctuation, and the engineering practice confirmed this. It was proved to be feasible to suit for all kinds of condition function by theoretical analysis. Practical project also proved that the stability and sensibility were enhanced, and operating cost was more commercial.

关 键 词：水泥 脱硝 氨水耗量计算 过程控制 优化设计 

分 类 号：TQ172.62[化学工程—水泥工业]