论文部分内容阅读
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。
The exhaust pipe of a 1000 MW direct air-cooled unit is a large-diameter, thin-walled and underpressured pipe. Its load conditions and the type of support and hanger are complex and its strength checking and stability analysis are necessary. The exhaust pipe system is modeled by using finite element software. According to the gravity, temperature, settlement difference, wind load and earthquake loads, 22 typical working conditions are calculated and analyzed, and the strength is checked according to the stress standard. The modal analysis and seismic response spectrum analysis of the exhaust pipe system were carried out. The dynamic stress of the exhaust pipe was studied and the buckling critical pressure of the exhaust pipe was studied by eigenvalue buckling analysis. Finally, based on the calculation and analysis results, the structure of the exhaust pipe system is optimized.