660 MW亚临界汽轮机可倾瓦轴承碾瓦事故分析  

Cause Analysis of Tilting-pad Bearing Damage in a 660 MW Subcritical Steam Turbine

作　　者：杨晓伟[1,2] 李国明[2] 谢澄[2] 马超[3] 

机构地区：[1]同济大学机械工程学院,上海210005 [2]国电浙江北仑第一发电有限公司,浙江宁波315800 [3]浙江浙能北仑发电有限公司,浙江宁波315800

出　　处：《发电设备》2016年第3期188-190,193,共4页Power Equipment

摘　　要：对660 MW亚临界汽轮机在启动或停机的低速过程中,可倾瓦轴承出现温度异常而碾瓦的原因进行了分析,从可倾瓦轴承的结构特点分析,确认由于底部瓦块承载过大、瓦块的自位能力受限,导致油膜破裂产生了碾瓦,并对该轴承及润滑油系统提出了改进措施。An analysis was conducted to both the structural features of a tilting-pad bearing and the reason of the bearing damage occurring in startup/shutdown of a 660 MW subcritical steam turbine due to abnormal temperatures, which was subsequently found to be caused by overloading at the bottom of the pad, resulting in limited self-aligning capability of the pad and broken oil film at low operation speed, thus leading to the bearing damage. Improvement measures were finally suggested for the bearing and lubricating system.

关 键 词：汽轮机 可倾瓦 低速碾瓦 

分 类 号：TH133.31[机械工程—机械制造及自动化]