直接空冷机组排汽管道弯头的失稳分析  

Instability Analysis on Steam Exhaust Elbow of Direct Air-cooling Units

作　　者：周昭伟[1] 

机构地区：[1]上海发电设备成套设计研究院,上海200240

出　　处：《发电设备》2013年第4期225-228,共4页Power Equipment

摘　　要：为了分析直接空冷机组排汽管道弯头在重力和外压载荷作用下稳定性能力,采用线性屈曲和非线性屈曲分析方法,并借助Ansys有限元分析软件,对比较常用的外径为3 200mm的直接空冷机组排汽管道弯头进行失稳分析,获得了不同的临界外压载荷,最后根据GB 150《压力容器》,得到稳定许用外压载荷。计算结果表明:就单独针对一个弯头而言,外压载荷对弯头的稳定性影响起着主要作用,而重力载荷对弯头的稳定性影响很小;线性屈曲分析获得的临界外压载荷不偏于保守,通常大于非线性屈曲分析获得计算结果。为了得到更安全的临界外压载荷,建议工程运用的时候要进行非线性屈曲分析。To analyze the stability of exhaust elbow of direct air-cooling units under both the action of gravity and external pressure load, an instability analysis was made to the exhaust elbow of OD 3 200 mm by using the linear buckling and non-linear buckling analytical method with the aid of Ansys finite element analysis software, during which different critical external pressures were acquired, and subsequently allowable external pressures were obtained in accordance with GB 150 Pressure Vessels. Calculation results show that for a single elbow, its stability is affected mainly by the external pressures but less by the gravity load; the critical external pressures obtained by linear buckling analysis do not conservative and are generally greater than the calculated results obtained by the non-linear buckling analysis. In order to obtain safer critical external pressures, it is suggested to carry out non-linear buckling analysis for actual engineering projects.

关 键 词：直接空冷机组 排汽管道 弯头 线性屈曲分析 非线性屈曲分析 子空间迭代法 弧长法 

分 类 号：TM621.72[电气工程—电力系统及自动化]