动静碰磨引起汽轮机转子非线性振动的诊断与处理

Diagnosis and Treatment of Nonlinear Vibration of Steam Turbine Rotor Caused by Dynamic and Static Friction

动静碰磨故障为汽轮机常见的振动故障之一,严重的碰磨故障会激发转子非线性振动。分析了碰磨引起冲击效应与热效应的机理,为分析转子碰磨故障提供一定的理论依据。通过分析某330 MW机组动静碰磨振动故障,证明碰磨故障引起的非线性振动不仅发生在轻型转子或振动试验台上。严重的动静碰磨在大型汽轮机转子上仍可激发非线性振动。对汽轮机高中压转子进行现场动平衡试验,成功解决了机组振动问题。

The dynamic and static friction fault is one of the common vibration faults of steam turbine. The serious friction fault will cause nonlinear vibration of rotor. The mechanism of impact effect and thermal effect caused by friction is analyzed, which provides a theoretical basis. By analyzing the dynamic and static friction vibration fault of a 330 MW unit, it is proved that the nonlinear vibration caused by friction fault not only occurs on light rotor or vibration test bench.Serious static and dynamic rubbing can excite nonlinear vibration on large turbine rotor. The field dynamic balance test of high and medium pressure rotors of steam turbine solved the vibration problem successfully.