1000MW汽轮机低压轴承温度异常分析及治理

Analysis and Treatment of Abnormal Temperature of Low Pressure Bearingon 1000MW Steam Turbine

某百万等级汽轮机低压转子轴承为座缸式轴承,自机组投运以来,多次发生低压轴承单侧瓦温超过报警值问题,经过翻瓦检修以及运行参数调整,始终不能彻底解决问题,严重影响机组运行的安全性。通过机组背压对轴承温度以及轴承座扬度的影响试验和研究,找出造成低压轴承瓦温高以及前后侧瓦温偏差大的原因,提出通过调整轴承球面配合尺寸来减弱汽缸变形对轴承卡涩的影响,并在现场实施,成功解决轴承单侧温度高、两侧温度偏差大问题。

The low pressure bearing of a 1000MW steam turbine is a pedestal cylinder bearing.Since the unit was put into operation,the temperature of one side bush of the low pressure bearing has exceeded the alarm value for many times.After the overhaul of the Bush and the adjustment of the operation parameters,the problem can not be completely solved,which seriously affects the safety of the unit operation.Through the test and Research on the influence of the back pressure of the unit on the bearing temperature and the bearing seat lift,the causes of the high temperature of the low pressure bearing bush and the large temperature deviation of the front and rear side bush are found out.It is proposed that the influence of the cylinder deformation on the bearing jam can be reduced by adjusting the spherical fitting size of the bearing,and the problems of high temperature on one side and large temperature deviation on both sides of the bearing are successfully solved.