管式热交换器的动态特性分析方法比较与验证

Comparison and Validation of Dynamic Characteristic Analytical Method for Tubular Heat Exchanger

以正常余热排出热交换器(RNS HX)为例,分别采用梁模型和3D壳-梁2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2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。对比秦山一期核电项目中热交换器固有频率的测试结果和巴基斯坦核电站二期(C-2)项目热交换器3D壳-梁模型的分析结果表明,3D壳-梁模型计算值与实测值吻合较好。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。

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 discrepancies 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 program.The experimental and numerical results agree 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.