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350MW超临界锅炉水冷壁多漏点爆管原因分析

Shaohai Ma,Yaodong Da,Xisheng Yang

China Special Equipment Safety（2018）

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Abstract
对某厂6号机组锅炉多漏点爆管的水冷壁管样进行了宏观检查与首漏点判断、金相检测及分析、扫描电镜及能谱分析.结果发现,水冷壁泄漏主要原因为焊接原因导致水冷壁管与鳍片焊接处存在过热组织;过热组织的出现,降低了焊接接头的整体力学性能,随着运行时间的延长,该薄弱处发生泄漏.最后提出了防止本锅炉机组再次出现水冷壁爆管的几点建议.
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