立式变频凝结水泵共振问题分析及实践研究  

Vibration analysis and field treatment of vertical variable frequency condensate pump with double resonance zone

作　　者：宋铜铜 宋亚军 张晓斌 刘双白 司派友 王新东 SONG Tongtong;SONG Yajun;ZHANG Xiaobin;LIU Shuangbai;SI Paiyou;WANG Xindong(State Grid Jibei Electric Power Co.,Ltd.Research Institute(North China Electric Power Research Institute Co.,Ltd.),Beijing 100045,China;Qinhuangdao Thermal Power Co.,Ltd.of Beijing Energy Investment Co.,Ltd.,Qinhuangdao 066000,China)

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 [2]京能秦皇岛热电有限公司,河北秦皇岛066000

出　　处：《热力发电》2023年第5期55-61,共7页Thermal Power Generation

摘　　要：变频凝结水泵由于立式结构支撑刚度不足和工作频率范围增大,容易产生结构共振。针对某350 MW机组立式变频凝结水泵出现双共振区振动超标问题,分析了结构共振产生的机理及影响因素、振动故障判断以及治理过程。理论计算和现场治理效果表明:当轴系存在不平衡量时,动平衡可有效降低凝结水泵共振区振动幅值,但当同时存在多个共振区且不同共振区对应的配重方案矛盾时,动平衡方式无法兼顾;配重角度决定动平衡效果,由于预留配重角度的局限性,以及共振点附近振动相位快速变化、测量不准等因素,实现现场精细动平衡存在一定难度;增加支撑提高系统刚度能够在改变固有频率的同时降低共振区内振动幅值,是治理共振问题的有效措施,且径向支撑取得的减振效果优于轴向支撑。Frequency conversion condensate pump is easy to produce structural resonance because of insufficient support stiffness of vertical structure and increased working frequency range.According to the problem of excessive vibration in two resonance zones of a 350 MW vertical variable-frequency condensate pump,this paper introduces the principle and influencing factors of structural resonance,the judgment method of vibration fault and the treatment process.Theoretical calculation and actual treatment results show that,when there is unbalance on the shafting,dynamic balancing can effectively reduce the vibration amplitude in the resonance area of the condensate pump.However,when there are multiple resonance zones at the same time and the counterweight schemes corresponding to different resonance zones are contradictory,the dynamic balance mode cannot be considered at the same time.The angle of the counterweight determines the dynamic balance effect.Due to the limitation of the reserved counterweight angle,the rapid change of the vibration phase near the resonance point,inaccurate measurement and other factors,it is difficult to achieve on-site fine dynamic balance.Increasing the support to improve the system stiffness can change the natural frequency of the structure and reduce the vibration amplitude in the resonance area,which is an effective measure to solve the resonance problem.The vibration reduction effect of radial support is better than that of axial support.

关 键 词：立式凝结水泵 变频运行 双共振区 动平衡 支撑刚度 

分 类 号：TM621[电气工程—电力系统及自动化]