1000MW超超临界机组给水泵汽轮机轴振增大原因分析与探讨

Analysis and Exploratory Study of the Causes for an Increase in the Vibration of the Shaft of a 1000 Ultra-supercritical Unit Feedwater Pump Steam Turbine

本文针对1 000 MW超超临界机组配备的给水泵汽轮机在运行过程中出现的振动增大问题,对可能引起振动增大的汽流激振、油膜振荡、转子质量不平衡、动静部件碰磨以及测量元件故障等因素进行了分析与探讨,并通过检验仪器对给水泵汽轮机和给水泵的振动进行了在线检测,为准确判断振动增大原因提供依据。通过对给水泵汽轮机和给水泵的振动增大过程、故障现象以及现场设备安装的实际情况的疏理,结合进一步地原因分析与研究,提出了检查给水泵汽轮机疏水阀门位置、彻底隔离高压汽源以及在轴承座上配置振动测量装置等防范和改进措施,最终找到了问题根源,并已成功解决了给水泵汽轮机振动增大问题,供大家参考。

In the light of the problem that an increase in the vibration occurs to a feedwater pump steam turbine equipped in a1000 MW ultra-supercrical unit during its normal operation,an analysis and exploratory study of the steam flow excitation,oil whipping,unbalance of the rotor in mass,rubbing between the rotor and stator and faults in the measurement elements etc. possibly causing an increase in the vibration were performed and an on-line inspection and measurement of the vibration of the feedwater pump steam turbine and the feedwater pump itself were also conducted through using test instruments,therefore providing an underlying basis for correctly judging the causes for an increae in the vibration. In combination with the actual conditions of the feedwater pump steam turbine and the feedwater pump undergone an increase in the vibration,phenomena of the faults and the installation of the equipment items on the spot,a further analysis and study of the causes were carried out. A series of prevention and improvement measures were proposed,including the inspection of the locations of the water drain valves in the feedwater pump steam turbine,thorough isolation of the high pressure steam sources and installation of vibration measuring devices on the pedestals of the bearings. Finally,the root causes of the problem were identified and the problem of an increase in the vibration of the feedwater pump steam turbine was successfully solved,thus offering reference for all persons concerned.