摘要
某450 MW燃机电厂在机组开机时,发生高温再热蒸汽冷段管道三通焊缝开裂泄漏。分别从焊缝开裂趋势、坡口结构形式及支吊架承载情况进行分析其开裂原因,结果表明管系限位支架承载失效、焊缝坡口形式的不规范,加之机组频繁启停,最终导致该焊缝接头开裂,并对开裂焊缝进行了修复。
During the start-up of a 450 MW gas turbine,there was a cracking on T-piece weld of cold reheated steam pipes. The causes of cracking are analyzed from the welds cracking tendency,groove structure and support loading condition. The results show that the load failure of pipe limiting supports,the non-standard groove of weld seam, and the frequent start-up and shutdown of the unit eventually lead to the cracking of the weld joint,and cracking weld has to be repaired.
作者
王林
刘金秋
夏晓涛
WANG Lin;LIU Jinqiu;XIA Xiaotao(Huadian Electric Power Research Institute Company Limited, Ji’nan 250014, China)
出处
《华电技术》
CAS
2019年第2期36-38,共3页
HUADIAN TECHNOLOGY
关键词
高温再热蒸汽
冷段管道
三通
坡口形式
管系应力
频繁启停
焊接及热处理
high-temperature reheated steam
cold pipe
T-piece
groove
tube stress
frequent start-up and shutdown
welding and heat treatment
