330 MW直接空冷系统凝结水管道的振动分析

直接空冷机组凝结水管道的振动问题严重影响机组的运行安全。某空冷电厂330 MW直接空冷机组的凝结水管道系统,在运行过程中发生持续整体振动。为消除振动,借助ANSYS Workbench仿真工作平台对凝结水管道系统进行模态计算。仿真分析结果表明,凝结水空化和水流冲击对管道系统的振动造成了影响。从改变管内流动特性角度对凝结水下降管段结构进行优化,并对优化前后的管道模型进行瞬态动力学分析。通过比较优化前后“提取点A”处的加速度时程曲线以及动压和全压的变化,评价了优化的效果。

Analysis on Condensate Piping Vibration of 330-MW Direct Air-Cooling System

The condensate pipeline vibration has great impacts on the safe operation of direct air-cooling units. The condensate pipeline system of a 330 MW direct air cooling power plant continuously vibrates during the operation. To remove the vibrations, the vibrational modes of the condensate pipeline system are calculated on the ANSYS Workbench simulation work platform. The simulation results show that the vibrations of the piping system are influenced by the condensate cavitation and water flow impact. Therefore, the structure of condensate water downcomer is optimized by changing the flow characteristics in tubes. Also, the transient dynamics analysis is applied to the pipe models before and after the optimization. In addition, by comparing the acceleration time curves and the changes of dynamic pressure and total pressure at Extraction Point A before and after the optimization, the optimization effects are evaluated as well.