300 MW汽轮机组动静碰摩及结构振动分析与治理  

Analysis and Treatment of Rubbing and Structural Vibration of 300MW Turbine Unit

作　　者：张晓斌[1] 余超 杨建刚[2] ZHANG Xiao-bin;YU Chao;YANG Jian-gang(North China Electric Power Research Institute Co.Ltd.;National Engineering Research Center of Turbo-Generator Vibration,Southeast University)

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]东南大学火电机组振动国家工程研究中心

出　　处：《电站系统工程》2022年第2期49-51,共3页Power System Engineering

基　　金：华北电力科学研究院有限责任公司科技项目(KJZ2020059)资助。

摘　　要：某300 MW汽轮机大修后启机,在暖机过程中高中压转子发生了振动不稳定爬升现象,经分析判断转轴和汽封发生了动静碰摩,现场采用多次升速、降速将动静间隙摩到合理范围解决了碰摩问题。定速3000 r/min转速时,低压缸轴承振动过大,甚至超过转轴振动。随后的超速试验中,在3135 r/min出现了轴承共振峰值,由此判断轴承振动过大主要是由于支撑系统刚度较弱引起的,运行转速落在了共振区域,才使轴承座振动过大,同时给出了治理方案。After overhaul of a 300 MW steam turbine, the HP-IP rotor occurs unstable climbing vibration during the warm-up process. It is judged that the shaft and the steam seal are rubbing. The dynamic and static clearance was rubbed to a reasonable range by increasing and decreasing the speed for many times, and the problem of rubbing was solved. At the constant speed of 3000 rpm, the bearing vibration of low pressure cylinder is too high, even more than the shaft vibration. In the overspeed test, the bearing vibration peak value appeared at 3135 rpm, so it was judged that the excessive bearing vibration was mainly caused by the weak stiffness of the support system, and the running speed fell in the resonance area, which made the bearing pedestal vibration too high. And then the treatment scheme was given.

关 键 词：汽轮机 振动 碰摩 结构振动 柔性支撑 

分 类 号：TK268.1[动力工程及工程热物理—动力机械及工程]