管式热交换器的动态特性分析方法研究  

Study of the Dynamic Characteristic Analytical method on the Tubular Heat Exchanger

作　　者：黄庆[1] 徐定耿[1] 陈孟[1] 

机构地区：[1]上海核工程研究设计院,上海200233

出　　处：《核电工程与技术》2013年第1期24-28,共5页Nuclear Power Engineering and Technology

摘　　要：热交换器结构复杂，在对其进行抗震分析时，如何合理地将热交换器简化成符合结构动态特性的有限元模型以及如何处理边界等都是难点问题。工程中通常采用梁模型和3D壳-梁模型对热交换器进行动态计算。本文以正常余热排出热交换器为例，分别采用梁和3D壳-梁两种模型对其进行固有频率的计算和比较，并通过一个圆筒考题来分析两种模型计算结果的差异．指出了梁模型中不合理的边界处理。文中还介绍了秦山一期各类热交换器固有频率的现场测试结果和C-2项目相应热交换器的3D壳-梁模型的分析结果，对比表明，由于3D壳-梁模型简化合理，所以其固有频率计算值与实测值很好地吻合。因此，3D壳-梁建模技术可应用于类似热交换器的动态特性分析。Due to the complex geometry, during the progress of tubular heat exchangers, difficulties may be encountered in simplifying performing a dynamic analysis on the heat exchanger into finite ele- ment models and in putting on the appropriate boundary conditions. Three dimensions beam and shell- beam models for the heat exchangers are usually applied to dynamic calculations in the engineering. In this study, the natural frequencies of Normal Residual Heat Removal Heat Exchangers are evaluated based on the beam and shell-beam finite element models. The corresponding results are compared and some dis- crepancies are observed. These discrepancies are analyzed in terms of the analysis of a cylindrical shell and the unreasonable treatment of boundary conditions is accordingly pointed out. The experimental data of the natural frequencies of heat exchangers used for Qishan Phase I Nuclear Power Plant are compared with the computational results from the shell-beam models for corresponding heat exchangers of C-2 pro- gram. The experimental and numerical results are consistent quite well, which implies that the shell-beam finite element simplification is applicable to the heat exchangers. The results indicate that the procedures introduced in this article apply to the dynamic analysis of other similar heat exchangers.

关 键 词：管式热交换器 动态特性 固有频率 3D壳-梁模型 梁模型 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]