俄制220MW汽轮发电机组低压转子振动分析及治理

Vibration analysis and disposal of LP rotor of 220 MW steam turbine unit made in russia

为了解决某电厂4号机组低压转子振动长期处于报警值的状况,首先对小修停机过程中轴系振动进行监测、分析,进而制定了在低压转子加重的动平衡方案;小修后启机,针对轴系振动出现的变化,经过分析判断,确认是轴系中心调整所致,并制定了在低发对轮加重的方案;最后将低压转子振动降至优秀的水平。处理结果表明,通过合理的轴系平衡可以以最少的启机次数解决低压转子振动超标的故障,为类似机组振动处理提供了参考。

The vibration of low pressure（LP） rotor of No.4 unit was often up to alarm value,in order to solve this problem,during shutdown for minor repair,the shafting vibration was monitored and analyzed.In addition,the dynamic balancing solution of LP rotor was made.After repair,aiming at the changing of the shafting vibration during startup,by means of accurate judgment and analysis,the reason was con-firmed： the shafting alignment resulted in this change.Based on it,counterweight was connected to the coupling between LP rotor and gener-ator rotor.Finally,the vibration level of LP rotor became excellent.The processing result shows that the vibration fault of the LP rotor can be solved through reasonable shafting balance with minimum start-up times,which can be as reference when resolving vibration problems of rela-tive units.