Tube bundle arrangements and heat transfer calculations of multi-stream spiral-wound heat exchanger

doi:10.16085/j.issn.1000-6613.2019-0774

Abstract

Abstract: The heat transfer calculation of multi-stream spiral-wound heat exchangers are difficult due to their complicated structure. The common calculation method is to develop a calculation model and perform numerical solution after giving some assumptions. However, this method is not suitable for engineering calculation because of complicated calculation. Some simple analytical calculation methods for engineering calculations have the disadvantages of complex iterative calculation and limited application range. This paper lists the tube bundle arrangements of several typical multi-stream spiral-wound heat exchangers, and analyzes their geometric characteristics. Moreover, it gives the tube plate structures and the corresponding ways to connect flow inlet and outlet of multi-stream heat exchangers, and analyzes their advantages and disadvantages and applications. For two conventional tube bundle arrangements, that is, each tube-side fluid arranged in multi-layers or the same layer, this paper recommends two simple heat transfer calculation methods suitable for engineering applications respectively. These two calculation methods simplify the calculation process by decomposing the calculation of complex multi-stream spiral-wound heat exchanger into multiple tube-side single-stream spiral-wound heat exchanger.

Key words: heat transfer, spiral-wound heat exchanger, multi-stream, tube bundle arrangement, heat transfer calculation

摘要： 多股流绕管式换热器的结构复杂，传热计算的难度较大。常见的计算方法是根据一些假定条件建立计算模型、进行数值求解，这种计算方法较复杂，不适合工程计算。而一些能用于工程计算的简便解析计算方法则存在迭代计算复杂、应用范围受限的缺点。本文列举了几种典型的多股流绕管式换热器的管束排列结构，分析了各自的结构特点；给出了多股流换热器的管板结构及相应的流体进出口接管方式，分析了各自的优缺点及应用场合。针对两种常规的多股流管束排列结构，即各股管程流体分层排布和同层排布，分别给出了适应于工程应用的简便传热计算方法。这两种计算方法将复杂的多股流绕管式换热器的计算分解为多个管程单股流绕管式换热器的计算，简化了计算过程。

关键词: 传热, 绕管式换热器, 多股流, 管束排布, 传热计算

CLC Number:

TK172

OUYANG Xinping, QIN Jie, XUE Linfeng, BAI Hua, XIA Rongxin, ZHAO Jiapu, LI Sisi. Tube bundle arrangements and heat transfer calculations of multi-stream spiral-wound heat exchanger[J]. Chemical Industry and Engineering Progress, 2019, 38(s1): 39-45.

欧阳新萍, 秦洁, 薛林锋, 白桦, 夏荣鑫, 赵加普, 李思思. 多股流绕管式换热器的管束排布及传热计算[J]. 化工进展, 2019, 38(s1): 39-45.

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