上汽1000MW超超临界汽轮机#1轴承振动故障诊断及处理

Fault Diagnosis and Treatment for No.1 Bearing Vibration of 1000MW Ultra-supercritical Steam Turbine

某上海电气引进德国西门子公司技术生产的超超临界汽轮发电机组,自投产以来长期存在#1轴承振动大且不稳定的故障。经过分析,#1轴振在高负荷时存在0.5倍频的低频振动,为蒸汽扰动造成的油膜涡动。检修发现#1轴承底部球面与支架之间存在损伤,经过分析认为该损伤的原因为微动磨损。通过激光高能处理,提高轴承与接触部件硬度,可以有效减缓与改善微动磨损问题,解决#1轴承轴振大且不稳定故障。

An ultra supercritical steam turbine generator set produced by Shanghai Electric Company with the technology of German Siemens has existed #1 bearing vibration and unstable fault for a long time since it was put into operation.After analysis, #1 shaft vibration has a low-frequency vibration of 0.5 times frequency under high load, which is the oil film whirl caused by steam disturbance. It was found that there was damage between the spherical surface at the bottom of the bearing and the support during the maintenance. After analysis, it was considered that the cause of the damage was fretting wear. Through high-energy laser treatment, improving the hardness of bearings and contact parts can effectively slow down and improve the problem of fretting wear and solve bearing shaft vibration fault.