汽动给水泵汽轮机轴向位移增大原因分析

针对宁东热电厂 2 号机组 A、B 汽动给水泵汽轮机轴向位移增大的问题,对事故原因进行分析,提出改进方法及预防措施。分析结果表明:转子轴向位移增大的主要原因是除氧器低温饱和蒸汽进入汽动给水泵汽轮机,造成了汽动给水泵汽轮机动叶受到水冲击,转子轴向推力增大,进而使得推力瓦块烧损,汽封齿磨损,轴向位移保护动作,引发给水泵汽轮机跳闸。

Cause analysis of axial displacement augmentation for steam feed pump steam turbine

Analyzes the problem of axial displacement augmentation for A and B steam feed pumpsteam turbine of No.2 unit in Ningdong thermal power plant,analyzes the cause factor of failure,puts forward improvement method and preventing measure. the analysis result shows that the maincause of rotor axial displacement augmentation is that low temperature saturation steam of deaeratorcome into turbine of steam feed pump and result in moving blade of turbine of steam feed pump tobring water induction and induce rotor axial thrust augmentation,further burn-out thrust bearingshoe,abrasion seal gear,axial displacement protection device to act,so caused turbine of steamfeed pump to trip.