抽汽管道膨胀受阻引起汽轮机振动异常分析及处理  

Analysis and Treatment of the Abnormal Vibration on Steam Turbine Unit by Blocked Expansion of Extraction Pipe

作　　者：张伟江 唐广通 高翔 张营 李浩 ZHANG Wei-jiang;TANG Guang-tong;GAO Xiang;ZHANG Ying;LI Hao(State Grid Hebei Energy Technology Service Co.,Ltd.,Shijiazhuang 050021,China)

机构地区：[1]国网河北能源技术服务有限公司,石家庄050021

出　　处：《汽轮机技术》2022年第4期292-294,共3页Turbine Technology

摘　　要：针对某电厂新建超临界350MW汽轮机组试运带负荷后3号轴承突发异常振动进行分析,通过分析2、3、4号轴承振动数据、停机过程中2、3号轴承振动Bode图、动静碰摩与转子位置的关系,诊断出3号轴承振动异常的原因是中压缸排汽端跑偏引起的轴承刚度降低故障。通过分析中压缸跑偏原因、并结合汽轮机相关运行参数,确定了4段抽汽管道膨胀受阻是中压缸跑偏的关键,将管道膨胀故障消除后,解决了机组带负荷后3号轴承振动异常问题。Aimed atthe emergency vibration increased of No.3 bearing after unit loaded of supercritical 350MW unit in trail operation.Through the analysis the vibration data,vibration Bode plot,relationship of the rubbing and the shaft centerline,the reason for the abnormal vibration of No.3 bearing was diagnosed as that the bearings stiffness reduction caused by the deviation of exhaust side of med-pressure cylinder.By analyzing the reason of deviation and the operation parameters,determined the blocked expansionof the No.4 extraction steam pipe.The vibration fault was solved after blocked pipeline expansion was eliminated.

关 键 词：振动异常 动静碰摩 轴心轨迹 汽缸跑偏 膨胀不畅 

分 类 号：TK268.1[动力工程及工程热物理—动力机械及工程] TM621[电气工程—电力系统及自动化]