660 MW汽轮机组低压缸异常振动的分析及治理  

Analysis and treatment of abnormal vibration for low-pressure cylinder of 660 MW steam turbine units

作　　者：滕千里 李卫军 马思聪 蔡文方 曾文进 张占杰 TENG Qianli;LI Weijun;MA Sicong;CAI Wenfang;ZENG Wenjin;ZHANG Zhanjie(E Energy Technology Co.,Ltd.,Hangzhou 310012,China;State Grid Zhejiang Electric Power Co.,Ltd.Research Institute,Hangzhou 310014,China;Ganzhe Guohua Xinfeng Power Generation Co.,Ltd.,Ganzhou,Jiangxi 341600,China)

机构地区：[1]杭州意能电力技术有限公司,杭州310012 [2]国网浙江省电力有限公司电力科学研究院,杭州310014 [3]赣浙国华信丰发电有限责任公司,江西赣州341600

出　　处：《浙江电力》2023年第7期110-116,共7页Zhejiang Electric Power

基　　金：国网浙江省电力有限公司科技项目(B311DS221009);杭州意能电力技术有限公司科技项目(EPRD2020-06)。

摘　　要：针对某660 MW超超临界汽轮机组调试期间出现的低压缸异常振动现象,通过振动测试与分析,发现低压缸轴瓦动刚度偏低且共振频率接近工作转速,若因动静碰磨等导致轴振爬升,会引起瓦振大幅爬升;同时发现低压外缸和化妆板间隙过小,会诱发低频结构共振。在机组运行中,应采取措施调整低压轴封供汽温度、控制机组负荷;在检修中,通过采取调整低压缸化妆板间隙、轴瓦安装尺寸、精细动平衡等措施,降低了低压缸的瓦振,提高了低压缸稳定性,确保机组安全可靠运行。Aiming at the abnormal vibration phenomenon of low-pressure cylinder during the debugging period of a new 660 MW ultra-supercritical steam turbine unit,through vibration test and analysis,it is concluded that the bearing bush of low-pressure cylinder has low dynamic stiffness and its resonance frequency is close to the working speed,if the shaft vibration climbs due to factors such as dynamic and static rubbing,the tile vibration will be caused to climb significantly.At the same time,it is found that the gap between the low-pressure outer cylinder and the cosmetic plate is too small,which will induce the generation of low-frequency structural resonance.During the operation of the unit,measures are taken to adjust the steam supply temperature of the low-pressure shaft seal and control the load of the unit.During the maintenance,measures such as adjusting the clearance of the cosmetic plate of low-pressure cylinder,the installation size of the bearing,and the fine dynamic balance are adopted to reduce the abnormal vibration of the low-pressure cylinder,which improves the stability of the low-pressure cylinder and ensures the safe and reliable operation of the units.

关 键 词：低压缸 结构共振 动静碰磨 轴封 

分 类 号：TM621[电气工程—电力系统及自动化]