摘要
为解决燃气-蒸汽联合循环发电机组试运行或生产运行中发生的异常振动问题,以某9F级燃气-蒸汽联合循环发电机组为例,分析响应扰力激振的基础底板、立柱、框架等构件的单质点、单自由度的振型,梳理机组扰力的产生、传递、激振响应过程及振动异常的主要原因;通过对比轴振(相对位移)、瓦振(绝对速度)的实测结果与标准限值,判断振动异常特征,并采取相应的降振措施。结果表明:立柱和框架的水平径向振动、水平轴向振动、底板竖向振动的单自由度与自振频率对发电机组振动起重要作用;机组轴系振动是多种振动的叠加,采用轴振、瓦振监测可有效判断机组异常振动;通过排查机组异常振动的不良因素,发现燃气轮机转子存在质量偏心是造成该机组异常振动的主要原因;结合动平衡试验,制订整改方案(在燃气轮机第7轴瓦侧增加质量为700 g的配重块,键相为∠60°;在燃气轮机第8轴瓦侧增加质量为800 g的配重块,键相为∠240°,在燃气轮机压气机轮盘处增加质量为1038 g的配重块,键相为∠220°),可有效解决机组异常振动;该分析方法可为类似机组异常振动的诊断与控制提供参考。
To address the abnormal vibration issues occurring during the trial or production operation of a gassteam combined cycle generator units,a 9F-class gas-steam combined cycle generator unit is taken as an example.The single-mass,single-degree-of-freedom vibration modes of components such as the foundation plate,columns,and frame in response to disturbance force excitation are analyzed.The generation,transmission,and excitation response processes of the disturbance force are outlined,along with the main causes of abnormal vibration.By comparing the measured results of shaft vibration(relative displacement)and bearing vibration(absolute velocity)with standard limits,the characteristics of abnormal vibration are determined,and corresponding vibration reduction measures are implemented.The results show that the single degree of freedom and natural frequency of the horizontal radial vibration,horizontal axial vibration,and vertical vibration of the base plate of the columns and frame play an important role in the vibration of the generator unit.The vibration of the generator unit's shaft system is a superposition of multiple vibrations;monitoring shaft vibration and bearing vibration can effectively identify abnormal vibrations.Through investigation of the adverse factors causing the abnormal vibrations,it is found that mass eccentricity of the gas turbine rotor is the main cause.Based on the dynamic balancing test,a rectification plan is developed(adding a 700 g counterweight with a key phase of∠60°to the 7th bearing side of the gas turbine;adding an 800 g counterweight with a key phase of∠240°to the 8th bearing side of the gas turbine;and adding a 1038 g counterweight with a key phase of∠220°to the compressor disc of the gas turbine),which effectively solve the abnormal vibration problem.This analytical method can provide a reference for the diagnosis and control of abnormal vibrations in similar generator units.
作者
薛兆奥
杨石春
XUE Zhaoao;YANG Shichun(Shenzhen Energy Group Co.,Ltd.,Shenzhen 518001,China)
出处
《内燃机与动力装置》
2026年第1期78-85,共8页
Internal Combustion Engine & Powerplant
关键词
燃气-蒸汽联合循环发电机组
单自由度
振动模态分析
异常振动
振动标准
gas-steam combined cycle generator unit
single degree of freedom
vibration modal analysis
abnormal vibration
vibration standard
