电站锅炉给水泵前置泵轴断裂原因分析  

Cause Analysis of Front Pump Shaft on Feed Pump in Power Station Boiler

作　　者：吕磊 张涛[1] 郭心爱[1] LYU Lei;ZHANG Tao;GUO Xin’ai(Inner Mongolia Power Research institute,Hohhot 010020,China)

机构地区：[1]内蒙古电力科学研究院,呼和浩特010020

出　　处：《内蒙古电力技术》2019年第1期75-77,81,共4页Inner Mongolia Electric Power

摘　　要：某电厂机组给水泵启动过程中发生给水泵前置泵轴断裂失效故障,对断口表面进行宏观检测、金相检测、化学成分分析、力学性能及显微组织检测。结果表明:泵轴材料在生产加工过程中热处理不当,泵轴推力盘轴头锁母螺纹根部存在较大的应力集中;给水泵前置泵启停及运行过程中负荷变化频率较大,使得螺纹根部承受较大载荷,3种因素共同作用造成泵轴推力盘轴头锁母螺纹根部萌生裂纹并逐渐扩展,以致整体断裂失效。The fracture failure of front pump shaft on feed pump in station boiler occurred during the operation of a power plant. The macroscopic examination, metallographic examination, chemical composition analysis, mechanical properties and scanning electron microscopic examination were used on the fracture surface. The experiments showed that the improper heat treatment of pump shaft material, the large stress concentration occurred at the root of the screw thread at the thrust disk head of pump shaft, and the variable load during the start-up and shutdown of the feed pump front-end pump and the operation process was endured by the root of the screw thread. And the three factors led the initiation of cracks along the root of the screw thread of the thrust disk head of the pump shaft, and the cracks gradually expanded and led to the overall fracture.

关 键 词：电站锅炉 给水泵前置泵轴 断裂 应力集中 脆性断裂 

分 类 号：TM621.2[电气工程—电力系统及自动化] TH131.3[机械工程—机械制造及自动化]