烟气脱硝SCR氨喷射系统调整效果评估  

Evaluation on Effects of SCR Ammonia Injection System Modification for Flue Gas Denitrification

作　　者：王乐乐[1] 周健[1] 姚友工 姚燕[1] 宋玉宝[1] 方朝君[1] 陈伟武[2] 

机构地区：[1]西安热工研究院有限公司苏州分公司,江苏苏州215011 [2]华能海门电厂,广东汕头515132

出　　处：《中国电力》2015年第4期16-22,共7页Electric Power

基　　金：华能集团科技支撑资助项目(HNKJ13-H06)~~

摘　　要：以某火电厂氨喷射系统(AIG)改造为例,通过数值模拟计算,对AIG调整方案的效果进行了评估。结果表明将AIG改为具备双向调节功能后,有利于氨的均匀分配,对于烟气流速不均具有更好的适应性。脱硝反应器出口截面NOx分布相对标准偏差由40%降低至15%以内。可改善脱硝装置喷氨合理性,一定程度上延长催化剂使用寿命,消除反应器出口氨逃逸浓度局部过高的现象,降低了下游空气预热器硫酸氢铵(ABS)腐蚀的风险,对火电厂实现NOx超低排放具有一定贡献。Taking the modification of ammonia injection grid （AIG） in a coal-fired power plant for instance, the effects of the modification are evaluated through numerical simulation and calculation. The results demonstrate that the two-way regulating function is beneficial to the even distribution of ammonia and it improves the adaptability to the uneven flue gas velocities. Moreover, the relative standard deviation of the outlet NOx distribution declines from 40% to lower than 15%. The modification improves SCR ammonia spraying effectiveness, increases the catalyst life span, eliminates the local high concentration of ammonia slip at the reactor outlet, reduces the risk of downstream ABS corrosion in the air pre-heater, and it therefore helps the coal-fired power plant achieve super-low NOx emissions.

关 键 词：燃煤电厂 烟气脱硝 选择性催化还原 氨喷射系统 调整 数值模拟 

分 类 号：X773[环境科学与工程—环境工程] TM621[电气工程—电力系统及自动化]