330MW汽轮机组励磁机转子振动分析与处理  

Vibration Analysis and Treatment of Exciter Rotor of 330MW Steam Turbine Set

作　　者：宋铜铜 张晓斌 宋亚军 司派友 SONG Tong-tong;ZHANG Xiao-bin;SONG Ya-jun(State Grid Jibei Electric Power Co.Ltd.Research Institute(North China Electric Power Research Institute Co.,Ltd.))

机构地区：[1]国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司),北京100045

出　　处：《电站系统工程》2024年第2期44-47,52,共5页Power System Engineering

摘　　要：针对某330 MW汽轮机组大修后阀门严密性试验过程中出现的轴系振动问题,根据冲转过程振动趋势以及轴承温度等数据,结合振动故障特征判断励磁机转子振动大是由轴承系统阻尼小、轴承标高偏低、外伸段效应以及临界区内停留时间长等多种原因导致,高中压转子振动大是由动静碰摩导致,并给出抬高#7轴承、密切观察#1、#2瓦振动的治理方案。汽轮机再次冲转定速后顺利完成各类实验并带满负荷,振动故障分析及治理效果表明:轴承标高直接影响其工作状态;励磁机转子属于发电机转子外伸段,当轴承支撑刚度不足,对转子约束力小时,可能会成为悬臂梁模型,出现不稳定振动;轴承系统阻尼越大,临界区停留时间越短,转子临界转速振动值越小;不同类型程度的动静碰摩导致的振动特征不同,当碰摩导致的振动发散不可控时,必须及时降速或停机盘车。Aiming at the shafting vibration problem occurred during the valve tightness test of a 330MW steam turbine unit after overhaul,according to the vibration trend and bearing temperature during impulse starting,based on the characteristics of the vibration fault,it is judged that the vibration fault of the exciter rotor is caused by a variety of reasons,such as small damping of the bearing system,low bearing elevation,extension section effect,and long residence time in the critical area.The high vibration of HP and IP rotor is caused by the rub impact between the rotor and the stator.And the treatment plan of raising#7 bearing and closely observing the vibration trend of#1 and#2 bearing is given.Subsequently,the turbine successfully completed all kinds of tests with full load.Vibration fault analysis process and treatment effect show that the bearing elevation directly affects its working state;the exciter rotor belongs to the extension section of the generator rotor.When the bearing support stiffness is insufficient and the binding force on the rotor is small,it may become a cantilever beam model,which is prone to produce unstable vibration;the greater the damping of the bearing system,the shorter the residence time in the critical region,and the smaller the vibration value of the rotor's critical speed;the vibration characteristics caused by dynamic and static rub impact of different types and degrees are different.When the vibration divergence caused by rub impact is uncontrollable,the speed must be reduced or the turning gear must be stopped in time.

关 键 词：励磁机转子 轴承标高 系统阻尼 外伸段效应 动静摩擦 振动 

分 类 号：TK267[动力工程及工程热物理—动力机械及工程]