抽汽背压式汽轮发电机组大轴弯曲原因分析及预防

汽轮机发生大轴弯曲事故不但会造成发电机组非计划紧急停机，影响大轴的使用寿命，严重时还会导致大轴永久损坏。而抽汽背压机组大轴弯曲是经常发生的，并伴随振动故障。结合某厂3号机组实例，分析了抽汽背压机组大轴弯曲的原因是轴封间隙过小和汽缸偏斜，导致动、静部分的碰摩以及转子中心孔进油引起的径向温差不均匀，提出严格执行检修规程和标准能有效防止大轴弯曲。

Cause Analysis and Prevention of Main Shaft Bending of Bleeding Back-pressure Steam Turbine-Generator Unit

Main shaft bending of steam turbine causes not only emergency shut-down of the power unit out of the plan,impacting the usage life of the shaft,but also leads to permanent damage of the shaft in worse cases.And the main shaft bending of bleeding back-pressure turbine unit happens frequently,accompanied commonly by vibration failures.The practice of the No.3 unit in a power plant showed,that the reasons of shaft bending of the bleeding back-pressure unit were the over small gaps of the shaft sealing and the ...