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 INNERMONGOL1AELECFRICPOWER 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 ol0080) 摘要：呼和浩特热 电厂2x350MW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 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；NO 文献标志码 ：B 中图分类号：TM621．2 文章编号：1008—6218(2016)03—0088—04 Analysisand TreatmentofBlockagein AirPreheaterof 350MW SupercriticalOnceThrough Boiler CU!Peng (HohhotThetflha|PowerPlant．1-lohh~}f 010080．China) Abstract：Theselectivecatalyticreduction (SCR)byreducingagentofammonia(NH+) isused toachieve the purposeofremovalofNO in flue gasin boilerdenitration system in HohhotThermal Power Plant．In the operation of ammonia and NO cannotallmix， escape is inevitable，when the escape rate ofoverweightammonia and sulfur trioxide in flue gas reaction generated hydrogen sulfate ammonia block in air preheater， due to differentialpressure increasing ofthe airpreheater．The application ofammonium hydrogen sulfate physical properties willbe ammonia decomposition hydrogen sulfate，airpreheater body heat will ammonia gasification hydrogen sulfate，eliminating air preheater clogging． Experiencecanbeused asreference in thesametypeunit． Key words-．supercriticalonce-through boiler；selective catalytic reduction method；air preheater；clogging；ammonium hydrogen sulfate；nitrogenoxide 1 设备概况 通风微负压、紧凑布置、干式排渣、全悬吊钢结构兀 型布置超