管壳式换热器换热管稳定性问题研究  

A Research on Tubes Buckling Problem of Tubular Heat Exchangers

作　　者：薛明德[1] 徐锋[2] 李世玉[3] 

机构地区：[1]清华大学工程力学系,北京100084 [2]中国特种设备检测研究中心,北京100013 [3]中国石化工程建设公司,北京100101

出　　处：《压力容器》2007年第3期8-11,共4页Pressure Vessel Technology

摘　　要：分别利用GB 151—1999计算方法、JB 4732—1995计算方法和弹性系统稳定性分析方法对换热管稳定性问题进行了研究。对不同参数的四个固定管板式换热器算例分别应用以上方法进行了计算,结果表明:现有的国家标准(GB 151)中换热管稳定性算法不考虑环板,将单根换热管失稳的欧拉临界应力除以安全系数ncr(取2)作为许用应力,其结果过于保守。The tube buckling is analyzed as a lone tube by the traditional method and as an elastic system by FEM. Two different mechanical models, in which the tubesheet is attached with or without an unperforated rim, are analyzed by traditional method. Four types of the fixed heat exchangers are calculated. The results Obtained by different methods are compared as follows：the critical buckling pressures obtained from two different mechanical models both are calculated bytraditional method; the critical buckling pressures obtained from elastic system by FEM and from a lone buckling tube by the traditional method. The design rule in the standard GB 151--1999, which defines the safety coefficient of 2, is too conservative because it doesn＇t consider the contribution of the unperforated rim. Therefore, a more economical safety coefficient of 1.5 is suggested by this thesis.

关 键 词：管壳式换热器 屈曲 换热管轴向应力 

分 类 号：TQ051.5[化学工程]