燃煤锅炉用水冷壁管腐蚀失效分析  

Failure Analysis on Water-wall Tube in Coal-fired Boiler

作　　者：徐娜[1] 时军波[1] 郭卫民[1] 丁宁[1] 吴晓峰[1] 胡志文[2] 

机构地区：[1]山东省科学院山东省分析测试中心山东省材料失效分析与安全评估工程技术研究中心,山东济南250014 [2]香港城市大学物理及材料科学系

出　　处：《热加工工艺》2014年第20期218-220,226,共4页Hot Working Technology

基　　金：中国应急分析测试平台科研项目(中应字(急)第201316号);山东省高水平海外特聘专家专项基金(tshw20120745)

摘　　要：通过宏观形貌检查、化学成分分析、金相检验、扫描电镜及能谱分析等手段,分析了某发电厂锅炉水冷壁管腐蚀破坏的原因。结果表明:水冷壁管破坏的主要原因是由于外壁高温烟气腐蚀与内壁垢下腐蚀、酸腐蚀共同作用的结果。燃煤中S含量和Cl含量高是引起外壁高温烟气腐蚀的主要因素;内壁存在的元素S和Cl是局部产生点蚀的主要原因。By macroscopic inspection, chemical composition analysis, metallurgical examination, SEM and EDS analysis ere, the corrosion failure analysis of boiler water-wall tube in power plant was investigated. The results show that the main reason for the destruction of water wall tubes is caused by high temperature gas corrosion of the outer surface, under-deposit corrosion and acid corrosion of the inner surface. High content of sulfur and chlorine is the main factor causing high temperature gas corrosion. The sulfur element and chlorine element of the inner surface are the main reasons for localized pitting corrosion. Finally, the improvement measures are proposed.

关 键 词：水冷壁管 高温烟气腐蚀 点腐蚀 氯离子 硫离子 

分 类 号：TG172.5[金属学及工艺—金属表面处理]