国产660 MW超临界机组高中压转子弯曲处理

当加工汽轮机转子的锻件毛坯材质存在较大的残余内应力,汽轮机组投运后,随着时间的累积,会因残余内应力的逐渐释放造成转子弯曲变形,从而引发机组强烈振动。某国产660 MW超临界机组高中压转子“残余内应力释放性”弯曲变形,引发振动不断攀升,通过分析转子振动变化趋势并揭缸检查,采取现场动平衡调试补偿措施,将转子振动降至合格范围。总结现场处理此类故障的经验并提出合理化建议,为同类型故障的处理提供参考。

Treatment of HP-IP Rotor Bending in Domestic 660-MW Supercritical Units

When excessive residual internal stresses exist in forging blanks of turbine rotors, bending deformation will happen with the stresses releasing as time passes after the unit is put into operation, causeing severe unit vibrations as a result. To solve the problems of the HP-IP rotor bending deformation and the followed rising vibrations of domestic 660-MW supercritical units caused by residual internal stress releasing, the casings are uncovered to analyze the vibration trends. Inner inspection and field dynamic balancing compensation measures are implemented, which have reduced the vibration to the acceptable range eventually. With the on-site experience of dealing with such faults, some suggestions are put forward to provide reference for tackling the same kind of issues.