摘要
轴系振动是影响抽水蓄能机组安全、稳定运行的最重要因素之一。为降低某抽水蓄能250MW机组轴系振动,调整相关运维参数,本文建立了其轴系有限元模型,计算分析了轴系在机械不平衡、不平衡磁拉力以及不同导轴承边界下的振动特性。计算结果表明:发电机质量不平衡对下导轴承影响最大,转轮质量不平衡对水导轴承影响最大。随不平衡磁拉力增大,轴承振动增大。轴瓦间隙越大、进油温度越高,导轴承振动幅值越大,轴瓦间隙是影响导轴承振动大小的主要因素。在机组动平衡良好的情况下,降低轴系振动,首先要考虑关键因数轴瓦间隙。
The shafting vibration is one of the most important factors that affect the safe and stable operation of a pumped storage generator.In order to reduce the shafting vibration of a 250MW pumped storage generator and adjust the relevant operation and maintenance parameters,this paper establishes the shafting finite element model,calculates and analyzes the vibration characteristics of the shafting under the conditions of mechanical imbalance,unbalanced magnetic pull force and different guide bearing boundaries.The calculation results show that the unbalance of generator quality has the greatest influence on the lower guide bearing,and the unbalance of runner quality has the greatest influence on the water guide bearing.With the increase of unbalanced magnetic pull,the bearing vibration increases.The larger the bearing clearance,the higher the oil inlet temperature,and the larger the vibration amplitude of the guide bearing,therefore,the bearing clearance is the main factor affecting the vibration of the guide bearing.In the condition of good dynamic balance of the generator,the key factor bearing clearance should be considered firstly to reduce the shafting vibration.
作者
狄洪伟
莫亚波
张政
姚航宇
陈裕文
李哲
张承强
DI Hongwei;MO Yabo;ZHANG Zheng;YAO Hangyu;CHEN Yuwen;LI Zhe;ZHANG Chengqiang(East China Yixing Pumped Storage Co.,LTD,Yixing,Jiangsu,214205;Shanghai Annaiji Energy Technology Co.,LTD,Shanghai,201203)
出处
《四川水力发电》
2019年第6期1-6,共6页
Sichuan Hydropower
基金
国家电网公司科技项目(525726170005)
关键词
抽水蓄能机组
有限元
谐响应轴系振动
pumped storage generator
finite element
harmonic response shafting vibration
