Analysis and Experimental Study on Unstable Vibration Caused by Steam Temperature Deviation
In order to solve the problem of unstable vibration of the high-pressure rotor of a certain type of 1 000 MW steam turbine,experimental research was conducted on the rotor vibration rule and its influ-encing factors.A dynamic model of the high-pressure rotor bearing system was established by the finite element method,and the influence of steam temperature deviation on vibration was calculated and ana-lyzed.The results indicate that the deviation of steam temperature changes the concentricity between the rotor and cylinder,resulting in unbalanced steam force acting on the rotor.The bearing load has been changed,leading to vibration.After the wear of No.1 bearing of the high-pressure rotor,the bearing clearance increases,the bearing stiffness decreases,and the impact of steam temperature deviation on unstable vibration increases,leading to the maximum vibration response moving towards the side of No.1 bearing.Measures such as reducing the deviation of steam temperature,preventing bearing babbitt wear and reducing bearing clearance have achieved good vibration reduction effects in practical application.
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