1050MW汽轮发电机组振动故障分析及治理

Analysis and Treatment of Vibration Fault of a 1050 MW Steam Turbine Generating Unit

在某2×1050 MW燃煤电厂1号机组基建调试中,5号、6号轴承振动严重超标,且不稳定,影响了工程进度。通过振动测试分析发现:低压缸B存在严重动静碰磨和热不平衡,导致5号轴承振动偏大;6号轴承动刚度较低,发电机定子底部载荷分配较差,导致6号轴承振动偏大,且不稳定。通过基于碰缸试验的动静间隙调整、基于发电机定子底部载荷试验的定子垫片调整、现场轴系动平衡等措施综合治理,消除了振动故障,提高了机组运行稳定性。部分治理经验成功应用于该发电厂2号机组的振动预防,表明该案例具有较好的工程参考价值。

During the capital construction commissioning of unit No.1 of a 2×1050 MW coal-fired power plant,vibration of bearings No.5 and No.6 exceeded the set standard and become rather unstable,holding up the project.Through vibration test and analysis,it is found that:1)there are dynamic and static collision and thermal imbalance in low-pressure cylinder B,resulting in excessive vibration of bearing No.5;2)the bottom load distribution on the generator stator is poor,and the bearing No.6 has a weak dynamic stiffness,resulting in excessive and unstable vibration.Through comprehensive treatment measures,such as the dynamic and static clearance adjustment based on the cylinder impact test,the stator gasket adjustment of the bottom load test of the generator stator,and field dynamic shafting balancing,the vibration fault is controlled,and the operational stability of the unit is improved.Part of the treatment experience has been successfully applied to the vibration prevention of unit.2,which indicates that this case can be employed as a good engineering reference.