350+MW超临界直流锅炉空预器堵塞原因分析及处理.pdfVIP

内蒙古电力技术 88 INNERMONGOLIAELECTRICPOWER 2016年第34卷第3期 doi:10.3969/j.issn.1008-6218.2016.03.014 350MW超临界直流锅炉空预器堵塞原因分析及处理 崔 鹏 （呼和浩特热电厂，呼和浩特 010080） 摘要：呼和浩特热电厂2×350MW机组锅炉脱硝系统采取选择性催化还原法（SCR），使用 还原剂氨（NH）来达到除去烟气中NO 的目的。运行中氨气和NO 不可能全部混合，逃逸无 3 x x 法避免，当逃逸率超标时，氨气与烟气中三氧化硫反应生成硫酸氢铵堵塞空预器，导致空预器 前后差压增大。对此根据硫酸氢铵的物理性质，采用空预器降风量升烟温的方法将硫酸氢铵 气化，消除空预器堵塞，经验可供同类型机组参考。 关键词：超临界直流锅炉；选择性催化还原法；空预器；堵塞；硫酸氢铵；NOx 文献标志码：B 中图分类号：TM621.2 文章编号：1008-6218（2016）03-0088-04 Analysis andTreatmentof Blockage in Air Preheaterof 350MWSupercritical OnceThroughBoiler CUIPeng （Hohhot Thermal Power Plant, Hohhot 010080,China） Abstract：The selective catalytic reduction (SCR) by reducing agent of ammonia (NH)3 is used to achieve the purpose of removal of NO in flue gas in boiler denitration system x in Hohhot Thermal Power Plant. In the operation of ammonia and NO cannot all mix, x escape is inevitable, when the escape rate of overweight ammonia and sulfur trioxide in flue gas reaction generated hydrogen sulfate ammonia block in air preheater, due to differential pressure increasing of the air preheater. The application of ammonium hydrogen sulfate physical properties will be ammonia decomposition hydrogen sulfate, air preheater body heat will ammonia gasification hydrogen sul