300MW汽轮发电机组不稳定振动的原因分析与处理  

Cause Analysis and Treatment of Unstable Vibration on 300MW Steam Turbine Generators

作　　者：牟法海 王博磊 昃刚 巩振泉 姚卫东 MU Fa-hai;WANG Bo-lei;ZE Gang;GONG Zhen-quan;YAO Wei-dong(HEBEIJi-Yan Energy and Technology Research Institute Company Limited,Shijiazhuang 050051,China;Hebei Xibaipo Power Generation Company Limited,Pingshan 050400,China)

机构地区：[1]河北冀研能源科学技术研究院有限公司,石家庄050051 [2]河北西柏坡发电有限责任公司,平山050400

出　　处：《汽轮机技术》2019年第6期454-456,共3页Turbine Technology

摘　　要：针对一台300MW机组在A修后带负荷期间1、2号轴瓦出现的不稳定振动问题进行了振动测试,通过对所采集的振动数据、振动趋势图和轴心位置图进行分析,诊断出造成1、2号轴瓦不稳定振动的原因是A修时汽封间隙调至下限和带负荷后布莱登汽封闭合引起的动静碰摩,并对动静碰摩故障的机理进行了分析,提出通过改变高压进汽阀门开度来改善高中压转子动静间隙和降低升负荷速率的措施,解决了1、2号轴瓦不稳定振动问题。The vibration test was carried out in order to solve the unstable vibration problem of the bearing shell of No.1 and No.2 during loading of a 300 MW unit after A repair.Through the analysis of the collected vibration data,vibration trend map and axial position map,the reason for the unstable vibration of the bearing shell No.1 and No.2 is diagnosed as that the gap of the steam seal is too small and the rubbing caused by the closing of the Braden steam seal.The caused analysis of the mechanism of rubbing failure are analysis.Through the measures of improveing the dynamic and static clearance of the rotor by changing the opening of the high pressure inlet valve and reducing the rate of loading,the unstable vibration of the bearing shell No.1 and No.2 are solved.

关 键 词：汽轮发电机组 不稳定振动 高中压转子 动静碰摩 布莱登汽封 

分 类 号：TK268.1[动力工程及工程热物理—动力机械及工程]