Analysis and Treatment of Low-pressure Cylinder Radial-axis Abnormal Coupling Vibration in the Large-scale Steam Turbine
Aiming at the abnormal problem of low-pressure cylinder radial-axis coupling vibration in the operation of large-scale steam turbines,this type of fault is particularly common in the low-pres-sure cylinder of a certain 9FA unit.The vibration characteristics of low-pressure rotor mass imbalance are analyzed.Combined with field test and analysis,the cause of the abnormal vibration is obtained,and the treatment method of radial-axis coupling vibration fault is proposed.The accuracy and practicability of the proposed method are verified by introducing the examples of low-pressure cylinder radial-axis coupling vibration treatment with different supports in detail.The results show that the field antisymmetric dynamic balancing is an effective means to suppress this type of fault,and it is also an effective way to decouple this type of fault;the simultaneous monitoring the low-pressure cylinder radial and axial vibra-tion can improve the fineness of fault identification and treatment.
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