某厂亚临界300MW机组在运行中#1轴承“Y”向轴振在负荷(230～250)MW时,#3高调阀开度为(20～30)％间突然增大,且随高调阀开度变化而波动,影响了机组安全运行.对此现象我们对该机组的振动进行监测,进行了故障分析,认为这种现象是由于#1轴承负荷偏低所致,根据现场实际情况,本着在不揭缸的情况下,尽量增大#1轴承负荷,而使动静间隙变化最小的原则,提出了降低#2轴承标高的处理建议,在C级检修中实施,机组启动后,#1轴承“Y”向振动最大值由原来的143μm降至108μm,取得了良好的效果.%A sub-critical 300MW unit operated with #1 bearing "Y" axis vibration suddenly increased when the load was (230~250)MW,and the #3 IV opening degree was (20~30)%,and #1 bearing"Y"axis vibration fluctuated with the change of CM opening, which affected safe operation of the unit In this regard, through monitoring the unit vibration,and failure analysis,we considered that this phenomenon was due to the #1 bearing being in low loads.In accordance with the. actual situation of the scene, with the spirit of not exposing cylinder,increasing the #1 bearing load to the greatest extent, changing the gap of dynamic-static part leqst,#2 bearing elevation was proposed to get lower and get implemented in the C-level maintenance After the start of the unit, the maximum "Y"axis vibration value of#l bearing was from 143μm down to 108μm, which achieved good results.
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