SCR脱硝喷氨优化对NO_x在线测量的影响分析  

Analysis on Optimization of Ammonia Spray for SCR system to NO_x on-line Measurement

作　　者：方朝君[1] 俞骏 周龙 周健[1] 

机构地区：[1]西安热工研究院有限公司苏州分公司 [2]华能太仓发电有限责任公司

出　　处：《电站系统工程》2015年第4期51-54,共4页Power System Engineering

基　　金：中国华能集团公司科技项目(HNKJ13-G13)资助

摘　　要：分析了SCR脱硝反应器出口NOx浓度分布不均匀性对NOx在线仪表测量和脱硝装置运行控制的影响,分别结合600 MW机组和330 MW机组脱硝装置运行实例,阐述了热态下进行喷氨优化调整的过程。优化后的测试结果表明：1反应器出口NOx浓度分布相对标准偏差可下降到8%-20%,脱硝效率恢复到设计水平;2反应器出口与烟囱入口NOx在线仪表的偏差可降到约15 mg/m3,有利于提高喷氨控制系统的自动投入率;3当地氧量浓度测量偏差会对NOx浓度折算造成影响,随着运行氧量的升高,缩小了允许绝对氧量变化的区间。The effects of reactor outlet NOx concentration maldistribution on analysis on-line instrument values and denitration device operation were analyzed. With a 600 MW unit and a 330MW boiler SCR system in operation as examples, the necessity and method of optimization ammonia spray for power plant SCR system are introduced. The results of optimized show that： 1） the NOx concentration relative standard deviation of SCR reactor outlet decreases to 8%20% by optimization ammonia spray for SCR system; 2） the deviation decreases to about 15 mg/m^3 between reactor outlet and the chimney entrance; 3） The local oxygen concentration measurement deviation affects the concentration of NOx, with the increasing of the oxygen content, allowing the absolute change of oxygen in narrow interval.

关 键 词：烟气脱硝 SCR 喷氨优化 硫酸氢铵 

分 类 号：X701[环境科学与工程—环境工程]