汽轮机转子不对中振动的诊断

Diagnosis of misalignment vibration of turbine rotor

南昌发电厂11号国产135 MW机组2005年大修后振动过大,一直认为是轴系不平衡所致,为此经多次平衡,未有明显效果。后在振动专家指点下,才查明了振动故障真正原因,是低发转子对中偏差达0.17 mm。通过调整,机组振动达到合格范围,消振一举获得成功。本文详细介绍了如何从机组振动历史、故障历史分析机组振动原因,如何检测转子不对中,确认故障原因,如何消除不对中,提出了具体方法,为诊断真正不对中振动提供指导和帮助。

It is wrongly considered that unbalance of shaft system caused excessive vibrations of Nanchang power plant 11 unit after major repair in 2005. Under the direction of expert on vibration, the cause was found that alignment deviation of rotor linking the pressure cylinder and generator nearly 0.17mm.Through adjustment, unit vibration meets the requirement. This paper elaborately introduced how to analyze vibration cause from the aspect of the history of vibration and fault and how to detect rotor misalignment. Finally, the method to eliminate misalignment was proposed.