Arabelle型核电汽轮发电机轴系振动与密封瓦运行状态分析  

Analyse on shafting vibration and operating state of sealing pad of Arabelle type nuclear power turbo generator

作　　者：张恒[1] 张卫军[1] 胡启龙 李振 张立军 赵博[1] ZHANG Heng;ZHANG Weijun;HU Qilong;LI Zhen;ZHANG Lijun;ZHAO Bo(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;Fujian Fuqing Nulear Power Co.,Ltd.,Fuqing 350318,China;Liaoning Hongyanhe Nulear Power Co.,Ltd.,Dalian 116000,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]福建福清核电有限公司,福建福清350318 [3]辽宁红沿河核电有限公司,辽宁大连116000

出　　处：《热力发电》2023年第10期138-143,共6页Thermal Power Generation

基　　金：西安热工研究院有限公司众创/研究开发基金(GB-22-TYK23);中国华能集团有限公司总部科技项目(HNKJ21-H59)。

摘　　要：以某百万千瓦级核电半速汽轮发电机组为研究对象,采用转子动力学的专业分析软件ARMD,建立弹簧基础-轴承-转子的动力学模型,通过动力学计算获得轴系动力学特性,现场实测轴系临界转速与计算值吻合,验证了该计算模型的准确性。在此基础上计算了发电机密封瓦热不平衡导致的振动响应,发现其振动变化主要集中于发电机转子处,密封瓦动静摩擦仅是轴系振动波动问题的直接影响因素之一,而非根本原因。同时对不同运行状态下密封瓦油膜受力进行分析,发现轴向倾斜对密封瓦受力影响最大,因此机组在检修调整过程中应保证加工及安装工艺,严防密封瓦运行过程中出现轴向倾斜。Taking a million kilowatt nuclear power half speed steam turbine generator set as the research object,a dynamic model of spring foundation bearing rotor is established by using the rotor dynamics professional analysis software ARMD.The dynamic characteristics of the shafting are obtained through dynamic calculation and analysis.The accuracy of the calculation model is verified by the coincidence of the field measured critical speed of the shafting and the calculated value.On this basis,the vibration response caused by the thermal imbalance of the seal pad of the generator is calculated.It is found that the vibration changes are mainly concentrated at the rotor of the generator,and the thermal imbalance of the seal pad is only the direct influence factor of the vibration fluctuation of the shaft system,but not the root cause.At the same time,the oil film stress of the seal pad under different operating conditions is analyzed,and it is found that the axial inclination has the greatest impact on the stress of the seal pad.Therefore,the processing and installation process shall be ensured during the maintenance and adjustment of the unit to prevent the shaft system deflection during the operation of the seal pad.

关 键 词：核电汽轮机 振动波动 密封瓦 轴向倾斜 ARMD软件 

分 类 号：TM311[电气工程—电机] TM623