汽轮发电机组自激振动的激振源分析

Analysis of the Self-excited Vibration Source of a Turbo-generator Unit

自激振动是汽轮发电机组经常发生的故障,尽管汽轮发电机组的自激振动可归纳为轴承稳定性不足和汽流激振两个方面,但要查找具体的激振源却十分复杂。文章结合4个实际案例,对轴承自位能力差、轴承标高沉降、间隙激振及密封激振等不同的自激振动源进行分析,并给出了相应的处理措施,解决了工程实际问题,可为汽轮发电机组自激振动故障的诊断和治理提供参考。

The self-excited vibration is regarded as a fault often taking place in turbo-generator units. Although the self-excited vibration can be attributed to the following two aspects: insufficient stability of bearings and steam flow excited vibration,yet it is very sophisticated to identify any specific excitation vibration source. In combination with four cases,various self-excited vibration sources such as poor self-alignment ability of bearings,dropping of the elevation of the bearings,clearance and seal excitation vibration etc. were analyzed and corresponding countermeasures were given to solve the practical problems in engineering projects,thus offering reference for diagnosing and disposing the self-excited vibration faults happening in turbo-generator units.