Abstract: Since the startup of the FCC II of certain company after overhaul, vibration of the flue gas turbine has been continuously rising. The vibration couldn't be improved obviously after operation adjustment and optimization. Online descaling of flue gas machine couldn't eliminate the abnormal vibration effectively. Finally, after repair and replacement of inlet deflection cone, the fault was eliminated and vibration restored to normal. Combining with the online condition monitoring of large units, this paper analyzes the impacts of operating condition adjustment on the vibration of the flue gas turbine. It discusses the problem of abnormal vibration of the flue gas turbine caused by high temperature creep deformation of the deflection cone. This provides reference for the disposal of similar problems in flue gas turbines.

Key words: vibration of flue gas turbine, deflection cone, high temperature creep