300MW电站锅炉后屏过热器爆管原因分析和对策

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Based on the experimental data,an failure analysis about the causes of the dissimilar steel weld joints rupture in the rear platen superheater tube of a large power plant boiler has been done.The results demonstrated that the enriched carbon layers around the melting line,residual stress and stress concentration leads to a premature failure of the dissimilar steel weld joints,and the retrofitting measures are introduced to ensure the safe operation of the power station boiler.At the same time,it can also supply references to the failure analysis of the similar structure boiler heating tubes.在试验的基础上,对某大型电站锅炉后屏过热器管异种钢焊缝破裂的原因进行了失效分析,结果表明熔合线增碳层,残余应力和应力集中导致了异种钢焊缝的早期失效,并提出了相应的改进措施以确保电站锅炉安全运行,同时,也可为同类型结构锅炉受热面管的失效分析提供参考。