【摘要】 1000 MW直接空冷机组排汽管道是大直径、薄壁、负压管道,其载荷条件和支吊架型式复杂,对其进行强度校核和稳定性分析是必要的。使用有限元软件对排汽管道系统进行建模,根据重力、温度、沉降差、风载、地震等载荷情况分为22个典型工况进行计算分析,同时根据应力标准进行强度校核。对排汽管道系统进行了模态分析和地震响应谱分析,研究了地震对排汽管道的动应力,并且采用特征值屈曲分析研究了排汽管道的屈曲临界压力。最后,根据计算分析结果对排汽管道系统进行了结构优化设计。更多还原

【Abstract】 The exhausting pipe system of a 1 000 MW direct air-cooling condenser unit is a large dimensional negative pressure thin-walled pipe with complex loads,supports and hangers.In the paper,the strength of the pipe was calculated and verified using ANSYS under the 22 representative typical conditions,which consisted of gravity,temperature,settlement difference,wind load,earthquake,etc.Moreover,the dynamic stress was analyzed by means of modal analysis and earthquake response spectrum analysis.Besides,engievalue buckling analysis was employed to determine the buckling critical external pressure.Finally,optimization design was made to the exhausting pipe system based on above analysis results.更多还原