超临界锅炉高温过热器T91钢管爆管分析  

Analysis of T91 Steel Pipe Bursting at High Temperature Superheater in Supercritical Boiler

作　　者：张李锋[1] 张兵[1] 王小迎[1] 罗鹏[1] 

机构地区：[1]陕西电力科学研究院,西安710054

出　　处：《材料导报（纳米与新材料专辑）》2014年第1期435-437,共3页

摘　　要：通过宏观分析、化学成分、显微组织、常温和高温力学性能、扫描电镜分析等试验手段对某电厂超临界锅炉高温过热器出口T91钢管爆裂的原因进行了分析。结果表明:由于管材组织严重老化、力学性能下降,以及短期过热等因素共同影响,钢管在超温过热环境下运行导致管壁承受的应力超过了其屈服极限,从而在相对薄弱的向火面处发生开裂。The causes leading to tube-burst failures on high-temperature superheater of supercritical boiler wereanalysed by means of macroexamination, chemical elements analysis, melallographic structure analysis, mechanicalproperties testing at elevated and room temperatures, SEM and so on. The results showed that clue to the joint influence of pipe microstructure seriously aging, mechanical properties decreased and short-time, the properties of the tube operated under overheating environment further decreased sharply, the pipe wall stress which caused by steel pipe run-ning at overtempearture and overheating environment was higher than its yield limit,all those caused lhe pipe crackedin the weak firmfacing side region.

关 键 词：超临界锅炉 高温过热器 爆管 组织老化 短时过热 屈服极限 

分 类 号：TM621.2[电气工程—电力系统及自动化]