直插式垫条型缠绕管式换热器过程强化

doi:10.16085/j.issn.1000-6613.2021-0016

摘要/Abstract

摘要：

为增强缠绕管式换热器的综合换热性能，本文提出一种沿径向安装于缠绕管式换热器芯筒内壁上的直插式垫条型内插件。通过数值模拟的手段，研究了直插式垫条型缠绕管式换热器的流动与换热性能。相比于传统结构，直插式垫条在固定管束相对位置的同时也可作为涡发生器，影响管束形成的尾流场，对管束边界层产生持续的扰动，增强缠绕管式换热器的综合换热性能。计算结果表明，在相同的进口工况下，直插式垫条型缠绕管式换热器壳侧努塞尔数相比于传统结构提高了13.01%～15.55%，压降升高了1.3%～4.3%，综合换热性能可提高7.4%~10.5%。并在此基础上研究了直插式垫条不同的排布方式对流动及换热性能的影响，在雷诺数5000～24000的工况条件下，直插式垫条对齐排方式的综合换热性能最优；在雷诺数24000～30000的工况条件下，直插式垫条交错排布的综合换热性能最优。

关键词: 缠绕管式换热器, 垫条, 数值模拟, 湍流强化, 排列形式

Abstract:

In order to enhance the comprehensive heat transfer performance of the spiral-winding tube heat exchanger, this paper presents a kind of vertically inserting space bars which is installed on the inner wall of the core tube of the spiral-winding tube heat exchanger along the radial direction. By means of numerical simulation, the flow and heat transfer performance of the spiral-winding tube heat exchanger with vertically inserting space bars were studied. Compared with traditional structure, it can also be used as a vortex generator while fixing the relative position of the tube bundle, affecting the wake field formed by the tube bundle, generating continuous turbulence on the boundary layer of the tube bundle, and enhancing the comprehensive heat transfer performance of the spiral-winding tube heat exchanger. Under the same imported conditions, the Nusselt number on the shell side of the spiral-winding tube heat exchanger with vertically inserting space bars was increased by 13.01% to 15.55% compared with the traditional structure, and the pressure drop is increased by 1.3% to 4.3%. And the comprehensive heat transfer performance can be increased by 7.4% to 10.5%. On this basis, the influence of different arrangements of the vertically inserting space bars on the flow and heat transfer performance was studied. The results showed that the comprehensive heat transfer performance of aligned arrangement was the best under the operating conditions of Reynolds number of 5000 to 24000, and the comprehensive heat transfer performance of staggered arrangement was the best under the operating conditions of Reynolds number of 24000 to 30000.

Key words: spiral-winding tube heat exchanger, space bar, numerical simulation, turbulence enhancement, arrangement form

中图分类号:

TK124

王斯民, 段旭东, 文键. 直插式垫条型缠绕管式换热器过程强化[J]. 化工进展, 2021, 40(12): 6613-6619.

WANG Simin, DUAN Xudong, WEN Jian. Comprehensive performance of spiral-winding tube heat exchanger with vertically inserting space bars[J]. Chemical Industry and Engineering Progress, 2021, 40(12): 6613-6619.

图/表 11

图1 几何模型

图2 网格无关性验证

图3 实验与模拟结果对比

图4 纵截面Q准则云图

图5 纵截面速度云图

图6 纵截面温度云图

图7 横截面速度矢量图

图8 PEC随入口流速的变化

图9 垫条排布方式

图10 PEC随雷诺数的变化

图11 低雷诺数工况下横截面湍动能云图

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