某电厂锅炉水冷壁管爆裂原因分析

张聪毅,潘恒沛,李雪峰

物理测试 ›› 2021, Vol. 39 ›› Issue (6) : 38.

物理测试 ›› 2021, Vol. 39 ›› Issue (6) : 38. DOI: 10.13228/j.boyuan.issn10010777.20210061
缺陷分析

某电厂锅炉水冷壁管爆裂原因分析

  • 张聪毅,潘恒沛,李雪峰
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Failure analysis of water wall tube burst in power plant boiler

  • 张聪毅,潘恒沛,李雪峰
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摘要

通过宏观分析、金相、SEM、能谱、XRD等手段分析了水冷壁管失效原因。结果表明,水冷壁管发生了酸性氢腐蚀,锅炉长期水质较差,且运行过程中pH值偏低是其腐蚀减薄的主要原因,而腐蚀产物中沉积的Cu及其氧化物,形成垢下腐蚀环境,加速了水冷壁管的腐蚀,最终在锅炉介质应力作用下发生脆性爆管。

Abstract

The failure causes of water wall tubes were analyzed by means of macro analysis, metallographic examination, scanning electron microscopy (SEM), energy spectrum analysis, and Xray diffraction (XRD). The results showed that the acid hydrogen corrosion occurred on the water wall tube. Longterm poor water quality and low pH were the main reasons for the corrosion thinning. Copper and its oxides in the corrosion product formed underdeposit corrosive environment, which accelerated the corrosion of water wall tube. Finally, the brittle tube burst occurred under the stress of the boiler medium.

关键词

水冷壁管 / 氢损伤 / 失效分析 / 酸腐蚀

Key words

acid corrosion /  failure analysis / water wall tube / hydrogen damage

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潘恒沛, 张聪毅, 李雪峰. 某电厂锅炉水冷壁管爆裂原因分析[J]. 物理测试, 2021, 39(6): 38 https://doi.org/10.13228/j.boyuan.issn10010777.20210061
PAN Hengpei, ZHANG Congyi, LI Xuefeng. Failure analysis of water wall tube burst in power plant boiler[J]. Physics Examination and Testing, 2021, 39(6): 38 https://doi.org/10.13228/j.boyuan.issn10010777.20210061

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