摘要
国内某大型核能汽轮发电机组自投产后,多台次出现轴系振动的连续性波动现象,波动幅度大且周期长。理论分析和检修记录推测为汽轮发电机密封瓦卡涩引发的莫顿效应所致。建立简化模型并对振动数据进行拟合,计算出初始不平衡质量及热变量分别对应的振动分量。分析认为热变量导致的振动分量占比小,机组轴系振动稳定性不受影响。应用该方法快速计算出转子初始不平衡质量对应的振动分量,进而实施动平衡试验可有效降低机组振幅。对某核能机组的现场工程实践经验验证了本方法的正确性。
Continuous shafting vibration fluctuation occurred on several large scale nuclear steam turbine generator units after being put into operation, with large fluctuation range and long period. It was speculated as Morton Effect which happened due to jamming of sealing pad in steam turbine generator unit, according to theoretical analysis and maintenance records. A simplified model was established to fit the vibration data, and the vibration components corresponding to the initial unbalanced mass and thermal variables were calculated. Analysis shows that, because the proportion of vibration component corresponding to thermal variable was small, the shaft system stability of the unit was not affected. By this new method, the vibration component corresponding to the initial unbalance mass of the rotor was quickly calculated and the vibration amplitude can be effectively reduced through the dynamic balance test. The correctness of the model has been verified by the field engineering practice in a nuclear power station.
作者
杨璋
尹小波
舒相挺
YANG Zhang;YIN Xiaobo;SHU Xiangting(Ningde Nuclear Power Company,Ningde 355200,China;Key Laboratory of Aircraft Environment Control and Life Support,MIIT,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)
出处
《热力发电》
CAS
CSCD
北大核心
2022年第5期121-126,共6页
Thermal Power Generation
基金
国家自然科学基金项目(51575418)。
关键词
核能汽轮发电机组
振动
稳定性
莫顿效应
数据拟合
动平衡
nuclear power turbine generator unit
vibration
stability
Morton Effect
data fitting
dynamic balance