垃圾焚烧余热锅炉过热器高温腐蚀原因分析及改造优化  

High Temperature Corrosion Source Trace of Waste Heat Boiler Superheater and Optimization by Structure Alteration in a MSW Incineration Power Plant

作　　者：龙吉生 严浩文 刘建 LONG Jisheng;YAN Haowen;LIU Jian(Shanghai SUS Environment Co.Ltd.,Shanghai 201703)

机构地区：[1]上海康恒环境股份有限公司,上海201703

出　　处：《环境卫生工程》2022年第6期22-27,共6页Environmental Sanitation Engineering

基　　金：国家重点研发计划固废专项(2020YFC1910100)。

摘　　要：高温腐蚀是制约垃圾焚烧发电厂长周期稳定运行的关键因素之一。以某垃圾焚烧发电项目余热锅炉为研究对象,分析了改造前和改造后过热器区域烟气温度、蒸汽温度、壁温以及炉内速度场分布情况。结果表明,通过优化受热面布置、设计折焰角等手段严格控制过热器管壁温度,改善水平烟道内流场冲刷不均匀性,可以降低过热器高温腐蚀风险。同时,12Cr1MoVG材质在壁温高于472℃时耐腐蚀性能明显下降,而TP347H材质在壁温约为493℃及以下温度区域仍能具有良好的耐腐蚀性能,建议当壁温高于465℃时,管壁采用耐腐蚀性能不低于TP347H的不锈钢材质或其他防腐工艺。High temperature corrosion is one of the key factors restricting the long-term stable operation of waste incineration power plants.A waste heat boiler of a waste incineration power plant was taken as the research object,the gas temperature,steam temperature,tube wall temperature of superheater and the distribution of velocity filed in furnace before and after modification were analyzed.The results showed that the high temperature corrosion risk of the superheater could be reduced by strictly controlling the tube wall temperature of superheater through optimizing the layout of heating surface and designing the furnace arch,and improving the non-uniformity of flow field scouring in the horizontal gas pass.At the same time,the corrosion resistance of 12Cr1MoVG material was decreased evidently when the wall temperature was higher than472℃,while TP347H material still had good corrosion resistance when the wall temperature was about 493℃and below.It was recommended that when the wall temperature was higher than 465℃,stainless steel with corrosion resistance no less than TP347H or other anti-corrosive processes could be used for tube wall.

关 键 词：垃圾焚烧 余热锅炉 高温腐蚀 设计优化 

分 类 号：X799.3[环境科学与工程—环境工程] TK223.32[动力工程及工程热物理—动力机械及工程]