某电厂锅炉高温过热器管泄漏原因  

Leakage Causes of High Temperature Superheater Tube in a Power Plant Boiler

作　　者：张鸿武 杨东旭 岳增武 邵明星 ZHANG Hongwu;YANG Dongxu;YUE Zengwu;SHAO Mingxing(Shandong Electric Power Industry Boiler and Pressure Vessel Inspection Center Co.,Ltd.,Jinan 250003,China;State Grid Shandong Electric Power Company Research Institute,Jinan 250003,China)

机构地区：[1]山东电力工业锅炉压力容器检验中心有限公司,济南250003 [2]国网山东省电力公司电力科学研究院,济南250003

出　　处：《理化检验（物理分册）》2020年第12期67-70,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某电厂锅炉高温过热器管在运行过程中发生了泄漏。通过宏观观察、化学成分分析、金相检验及拉伸试验等方法对高温过热器管的泄漏原因进行了分析。结果表明:异物堵塞使冷却介质流量过低,管壁温度在短时间内突然上升,超过了12Cr2MoWVTiB钢的相变温度,管壁强度大幅降低。在内部蒸汽压力的作用下,管壁发生塑性变形,管径胀粗、管壁减薄,随后管壁发生剪切断裂而泄漏。The high temperature superheater tube of a power plant boiler leaked during operation.The leakage causes of the high temperature superheater tube were analyzed by means of macroscopic observation,chemical composition analysis,metallographic examination and tensile test.The results show that the flow rate of cooling medium was too low due to the blockage of foreign matters.The temperature of tube wall rose suddenly in a short time,which exceeded the phase transformation temperature of 12 Cr2 MoWVTiB steel,and the strength of tube wall was greatly reduced.Under the action of internal steam pressure,the tube wall plastic deformation occurred,the tube diameter expanded and the tube wall thinned.Then the tube wall was shear fractured and leaked.

关 键 词：锅炉 高温过热器 12CR2MOWVTIB钢 相变 短时过热 泄漏 

分 类 号：TG115.2[金属学及工艺—物理冶金]