摘要
某200MW机组运行过程中,在带大负荷阶段出现发电机轴振异常升高、发电机氢气纯度低的故障。通过跟踪对比发电机轴瓦振动的变化,制定了试验方案并实施,在分析运行及试验数据的基础上,对发电机轴瓦振动大故障进行了诊断。诊断结果表明,发电机轴瓦振动大的原因为发电机转子高负荷发生热弯曲,氢气纯度低的原因为振动大导致密封瓦和轴颈损坏,氢气受到密封油污染。根据诊断结果,结合现场实际运行情况,在7瓦滑环处加配重块,进行现场高速动平衡,同时对6瓦轴颈进行修复,更换6、7号密封瓦。动平衡和检修结果表明,发电机轴瓦振动得到了有效降低,氢气纯度恢复正常。
In a 200 MW unit in the process of operation, abnormal vibration generator shaft with big load phase increases, generator hydrogen purity low failure.Through comparing the change of the generator bearing vibration track,develop the test plan and implement, on the basis of analysis and test data,for large generator bearing vibration fault diagnosis.Diagnostic results show that the reason for the generator rotor of the generator bearing vibration high hot bending load,lead to seal the reasons for the low hydrogen purity for vibration and shaft neck damage,hydrogen seal oil pollution.According to diagnosis,combining with the actual operation,at 7 watts slip ring and counter weight,on-site high speed dynamic balance,at the same time to repair of 6 wazhou neck,replace the seal 6,7 watts.Dynamic balance and repair results show that the generator bearing vibration has been effectively reduced,the hydrogen purity returned to normal.
关键词
发电机
振动
氢气纯度
热弯曲
动平衡
generator
vibration
hydrogen purity
thermal bending
dynamic balancing
