锅炉装置屏式过热器爆管失效分析  

Failure Analysis of Platen Superheater Tube Explosion in Boiler

作　　者：孟令强 张永良 Meng Lingqiang;Zhang Yongliang(State Nuclear Power Station Operation Service Technology Co.,Ltd.,Shanghai 200233;State Nuclear Demonstration Power Station Co.,Ltd.,Weihai 264300)

机构地区：[1]国核电站运行服务技术有限公司,上海200233 [2]国核示范电站有限责任公司,威海264300

出　　处：《山西冶金》2023年第3期19-20,34,共3页Shanxi Metallurgy

基　　金：项目由国家科技重大专项资助(项目名称为在役核电站重要构筑物及设备材料老化退化行为规律与预测模型研究,项目编号为2019YFB1900904)。

摘　　要：某电厂锅炉联合装置经过长时间运行,在大修结束重启运行后发生屏式过热器爆管。结合爆口的形貌特征,通过管壁测厚、化学成分分析、室温拉伸试验、显微维氏硬度试验、金相分析及扫描电镜及能谱分析等试验方法对爆管进行失效原因分析。结果表明:屏式过热器管道在长期运行过程中产生较厚氧化层皮并不断脱落导致壁厚严重减薄,高温导致炉管材料老化严重、性能下降,最终承受不住管道运行压力而爆管。After a long time of operation,the platen superheater tube burst after the boiler combined unit of a power plant was restarted after the overhaul.Combined with the morphology characteristics of the burst,the failure reason of the burst tube was analyzed by tube wall thickness measurement,chemical composition analysis,tensile test at room temperature,Vickers hardness test,metallographic analysis,scanning electron microscope and energy spectrum analysis.The results show that the platen superheater pipe produces thick oxide layer and continuously falls off during the long-term operation,resulting in serious wall thickness thinning,and the high temperature causes serious aging of furnace tube materials,performance degradation,and finally burst due to the inability to withstand the operating pressure of the pipe.

关 键 词：屏式过热器 爆管 氧化皮 减薄 超温 

分 类 号：TG115[金属学及工艺—物理冶金]