660MW汽轮发电机组热态启动振动诊断及处理

Vibration Diagnosis and Disposal of a 660MW Turbo-Generator Unit During Hot Starting

针对某电厂660 MW机组热态启动过程中1瓦振动过大问题,分析机组升速、降速和定速过程中振动变化特征,确定故障原因是热态启动条件下胀差过小导致碰摩。通过调整运行参数,缩短升速时间,机组成功升至额定转速,且振动状态优良,对治理同类故障具有参考价值。

To solve the problem of excessive shaft vibration near the first bearing of a 660 MW unit during hot starting process, the vibration characteristics were analyzed when the turbine was accelerating, decelerating or at a constant speed, after which the fault was found to be caused by rub-impacts due to too small expansion difference in the case of hot starting. By adjusting the operation parameters and shortening the speed-up time, the unit succeeded in reaching rated speed and the vibration was kept within reasonable range. This may serve as a reference for dealing with such kind of faults.