屏式过热器管相变爆管失效分析  

Failure Analysis on Phase Transformation Tube-bursting of Platen Superheater

作　　者：李修能 杨朝 Li Xiuneng;Yang Chao(China Special Equipment Inspection and Research Institute,Beijing 100029;Liaoning Dongke Electric Power Co.Ltd,Shenyang 110006)

机构地区：[1]中国特种设备检测研究院,北京100029 [2]辽宁东科电力有限公司,沈阳110006

出　　处：《中国特种设备安全》2020年第10期73-76,共4页China Special Equipment Safety

基　　金：十三五重点研发计划项目“持种设备安全防护系统功能安全完整性检测与评估关键技术研究”,项目号2018YFC0808904.

摘　　要：某发电厂2#炉300MW机组新更换的12Cr1MoV屏式过热器管运行48h后发生爆管。对屏式过热器管进行宏观检查、化学成分分析、力学性能分析及金相显微组织观察,结果表明:屏式过热器管化学成分符合标准要求,爆口附近存在明显涨粗现象.力学性能不合格,金相组织发现相变。综合分析,屏式过热器管可能存在堵管现象,造成爆口管段附近温度过热到相变温度区间,致该管段区域力学性能显著下降,最终引发爆管。After 48 hours of operation,the new replacement platen superheater made of 12CrlMoV burst.The reasons of tube-bursting were analyzed through macroscopic check,Composition analysis,mechanical properties testing and metallographic observation.The results showed that the platen superheater tube chemical components conform to the standard,and the tube-bursting had a swelling phenomenon.The mechanical properties of the tube was unqualified,and it happened phase transformation.Through comprehensive analysis,the platen superheater tube may exist plugging phenomenon,caused the temperature in the vicinity of the burst pipe section to overheat to the phase transition temperature range,then the mechanical property of the pipe section is obviously decreased,finally burst.

关 键 词：过热器管 相变 涨粗 爆管 失效分析 

分 类 号：X933.2[环境科学与工程—安全科学]