某电厂高温再热蒸汽管道内壁开裂原因分析与处理

doi:10.16039/j.cnki.cn22-1249.2019.07.017

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摘要

通过宏观观察、金相观察、成分和硬度分析以及结构分析，对某发电公司330MW亚临界机组高温再热蒸汽管道内壁开裂原因进行了分析，认为该内壁裂纹为热疲劳裂纹，前段疏水管易形成冷凝水倒流，使温度较高的管座内壁形成热交替循环，最终导致热疲劳裂纹的产生。对此提出了相应的处理意见，并取得了良好效果。

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	孙旭

关键词: 高温再热蒸汽管道疏水管裂纹热疲劳

Abstract:

Failure analysis of a 330 MW subcritical unit high temperature reheat steam pipe inwall cracks was studied by means of macroscopic observation, metallographic examination, composition analysis, hardness test and structure analysis. The results showed that the cracks in the inner wall are thermal fatigue cracks, which was caused by the repeatedly change of ambient temperature around the drain pipe hole. When the expansion and contraction of pipe wall caused by temperature variation is restrained, cyclic thermal stress was produced. In this way, the material is subjected to fatigue damage, and the transverse crack defects perpendicular to the expansion and contraction direction of the pipe are formed.

Key words: high temperature reheat steam pipe drain pipe crack thermal fatigue

出版日期: 2019-07-25 发布日期: 2019-07-25 整期出版日期: 2019-07-25

TG115

引用本文:

孙旭. 某电厂高温再热蒸汽管道内壁开裂原因分析与处理 [J]. 吉林化工学院学报, 2019, 36(7): 76-79.
SUN Xu. Failure Analysis and Settlement of High Temperature Reheat Steam Pipe of One Power Plant . Journal of Jilin Institute of Chemical Technology, 2019, 36(7): 76-79.

链接本文:

https://xuebao.jlict.edu.cn/CN/10.16039/j.cnki.cn22-1249.2019.07.017 或 https://xuebao.jlict.edu.cn/CN/Y2019/V36/I7/76

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