缠绕管换热器性能数值模拟研究

Numerical Simulation Study of Spiral-Wound Exchanger

摘要: 层间距以及管间距不仅影响换热器的传热性能，而且影响换热器的几何结构。本文采用FloEFD软件数值模拟研究了三种不同层间距(4 mm, 7 mm, 10 mm)以及管间距(15 mm, 18 mm, 21 mm)对缠绕管换热器的换热性能的影响。结果表明在不同层间距条件下壳程流体出口温度、壳程流体速度以及壳程压降随着层间距的增加而减小；在不同管间距条件下壳程流体出口温度、壳程流体速度随着管间距的增加而减小而壳程压降随着层间距的增加而增大；采用换热器综合性能评价指标(单位壳程压降)来衡量换热器的传热效果，表明层间距以及管间距越小，换热器综合性能指标最好。研究结果对换热器的设计具有一定的指导意义。

Abstract: Both the layer spacing and tube pitch of heat exchanger affected not only the heat transfer but also the geometry of heat exchanger. In this paper, three different kinds of layer spacing (4 mm, 7 mm, 10 mm) and tube pitch (15 mm, 18 mm, 21 mm) of spiral-wound exchanger were investigated using numerical simulation by FloEFD software. The result showed that the shell side fluid temperature at the pipe outlet, fluid flow rate and pressure drop decreased with increasing layer spacing; the shell side fluid temperature at the pipe outlet, and fluid flow rate decreased with increasing tube pitch. But, pressure drop increased with increasing tube pitch. The comprehensive performances (the unit pressure drop at shell side) were used to evaluate heat transfer performance and the results indicated that the smaller the layer spacing and tube pitch, the better the comprehensive performances. The results provided a reference for heat exchanger design.