现役燃煤机组全工况脱硝技术比较  

Comparison of Denitrification Technology for In-service Coal-fired Unit in All Conditions

作　　者：陈华桂[1] 何育生[1] 戴兴干 

机构地区：[1]江苏方天电力技术有限公司,江苏南京211102

出　　处：《电力工程技术》2017年第5期160-164,共5页Electric Power Engineering Technology

摘　　要：燃煤机组低负荷调峰运行时,从省煤器出口进入SCR(selective catalytic reduction)脱硝装置的烟气温度偏低,偏离了脱硝催化剂的温度窗口,造成脱硝效率低,甚至脱硝系统无法正常投入,导致氮氧化物排放浓度超标,成了制约机组的深度调峰能力主要因素。文中介绍了几种实现燃煤机组NOx全工况达标排放的SCR入口烟气温度提升技术,包括省煤器烟气旁路、省煤器分级、省煤器水侧旁路、弹性回热、热水再循环、省煤器分隔烟道、烟气补燃等,并就各自的技术特点进行了对比分析,为电厂开展全工况脱硝改造提供参考。Low load peak operation of coal-fired unit the flue gas temperature from the economizer outlet enters the SCR denitrification device is low,deviated from the temperature window of the denitrification catalyst, resulting in low efficiency of denitrification,even the denitrification system is not normal put into operation, resulting in the concentration of nitrogen oxides emission exceeded, has become the main factors restricting the unites depth peak capacity. This paper introduces several SCR inlet flue gas temperature upgrading technology for realizing the emission of NO% of coal-fired unit, and compares the technical characteristics of each other, and provides reference for the power plant to carry out the whole working condition denitrification Reformation.

关 键 词：燃煤机组 烟气脱硝 选择性催化还原 低负荷 烟温 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]