避免锅炉尾部受热面低温腐蚀的方法与锅炉结构的研究  

Research on Methods of Avoiding Low-temperature Corrosion on Heating Surface of Boiler Rear and Boiler Structure

作　　者：谭大治 张晓阳 TAN Da-zhi;ZHANG Xiao-yang(China Huadian Engineering Co.,Ltd.,Beijing 100160,China)

机构地区：[1]中国华电科工集团有限公司,北京100160

出　　处：《应用能源技术》2021年第3期10-12,共3页Applied Energy Technology

摘　　要：文中论述了锅炉尾部低温腐蚀形成的原因以及危害,提出一种使用“水-风”换热系统来进行防腐的方法,该系统包括空气预热器与烟气冷却器,空气预热器将锅炉给水中的热量传给助燃空气,烟气通过五级烟气冷却器后温度降至高于烟气露点的135.6℃,避免了烟气中的SO_(2)与水蒸汽形成H_(2)SO_(3),从而解决锅炉尾部低温腐蚀的问题,该系统经热平衡计算检验,符合锅炉设计准则。This paper discusses the causes and hazards of low-temperature corrosion at the bottom of the boiler and proposes a“Water-Air”heat exchange system with air preheater and ash cooler for anti-corrosion.The air preheater transfers the heat from the feed water to the secondary air.After the flue gas passes through the five-stage ash cooler,the temperature drops to 135.6℃higher than the flue gas dew point and avoiding the formation of H_(2)SO_(3) from SO_(2) and water vapor in the flue gas,which solving the problem of low-temperature corrosion at the boiler bottom.Meanwhile,the system has been verified by heat balance calculation and meets the boiler design criteria.

关 键 词：低温腐蚀 空气预热器 烟气冷却器 

分 类 号：TK224.9[动力工程及工程热物理—动力机械及工程]