Analysis And Treatment Of Fault Vibration To A600MW High-pressure Turbine Rotor

With the rapid development of China’s power industry, large grid, large units,high-parameter of the basic mode of operation has becomed,600MW thermal powerlevel gradually become the main thermal power, due to the complexity of the unitstructure and system greatly increases, predisposing factors arising from failure moreand more, the failure of the coupling and the sudden increase. The stability of Turbinerunning is a critical issue to determine the economic benefits, also will attract moreand more attention of the power generation companies.This paper studied the instability of shaft system caused by frictional vibration andthe abnormal vibration problem at critical speed of a600MW turbo generator unitduring the first start after overhauling. First, based on the high pressure cylinder rotorentity model,3D entity model has been established by Solid Works. The process rotorimpeller and rotor system was simplified according to the research of the finiteelement method of rotor dynamics. Second, through the study of the dynamiccharacteristics of the sliding bearings principles and methods of solving, the dynamicscoefficient of the high-pressure cylinder rotor bearing was solved, and the influenceof operating parameters such as the unit speed, oil temperature and bearing clearanceon the dynamic coefficients were studied. Then, by the finite element analysissoftware of ANSYS, natural frequencies, mode shapes, stability of the rotor andunbalance response during startup were analyzed, and the vibration characteristics ofthe unit was obtained. Finally, combined with the abnormal failure characteristics of600MW Turbo Generator Unit’s shaft instability during start process and the vibrationfault at critical speed, the vibration fault was detailed analyzed. The cause of themalfunction was processed and the vibration of the unit was rectified.