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一起备用凝结水泵启动后轴承冒烟事故分析

2024-11-20

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过程现象:

X年10月30日18时04分3A凝结水泵滤网堵,3B凝结水泵两次备用状态突然启动,十几分钟后推力轴承温度持续升高至91℃(第二次轴承温度很快升至75℃停泵),轴承冒烟。

原因分析:

1) 油中带水,因冷却水管垫直径较大,密封不严水进入轴承箱,同时更换冷却水管时不注意水从轴承压盖与轴的密封处进入轴承室,运行初期泵旋转中,油质不良但油与水并未分层,故障冷却效果虽差,未造成烧瓦,当泵停止备用时,油水分层,积聚在底部,推力瓦大部分浸在水位形不成油膜,在启动初期即很快烧毁,(温度显示并不高70)且造成油质进一步恶化,引起导瓦烧毁。

2) 检修过程中换油时,电建放油未从底部放油丝堵放油,而是从推力轴承温度变送器处放油,积水无法排出,油乳化造成推力瓦烧毁。

3) 凝泵推力轴承存在问题。

4) 泵的安装工艺存在问题。

5) 油位过高,油温较高;45-55mm即油标的1/4~1/3;

6) 检查冷却水量设计偏低;

7) 闭式冷却水进水与旁路调整门同时关闭造成冷却水断水。

防范措施:

1) 加强油质检查。

2) 倒泵时应注意观察新启动泵的运行状况良好,方可停止运行泵。

3) 切停泵时必须解除联锁。

(来源:火电厂技术联盟)