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Numerical Investigation of Short Elliptical Twisted Tube for Reduced Fouling Rate in Steam Cracking Furnaces
Heat Transfer Engineering ( IF 2.3 ) Pub Date : 2021-08-23 , DOI: 10.1080/01457632.2021.1963536
Bruce Indurain 1, 2 , François Beaubert 1 , David Uystepruyst 1 , Sylvain Lalot 1 , Mathieu Couvrat 2
Affiliation  

Abstract

In the steam cracking industry of natural gas or naphtha, fouling of tubular heat exchangers by cokes is a major issue. This growing carboneous layer has two major negative effects: 1) it increases pressure drop and 2) reduces heat transfer from the tube wall to the processed fluid. Using the open-source Computational Fluid Dynamics software OpenFOAM, this study numerically investigates wall shear stress, pressure drop and heat transfer performances of swirl decaying flow generated by different elliptical cross-section twisted tube. One of the objectives is to determine if minor modifications of tube geometry can generate swirling flow which could enhance wall shear stress at a reduce pressure drop penalty. For a Reynolds number ranging from 10, 000 to 100, 000, it is shown that the investigated geometries could enhance heat transfer by 90% at an increased pressure drop of 128% which yields a Performance Evaluation Criterion (PEC) of 1.44. The comparison between the performances of the different geometries is carried out using a newly defined PEC based on the bulk temperature, along with the usual PEC.



中文翻译:

用于降低蒸汽裂解炉结垢率的短椭圆扭管数值研究

摘要

在天然气或石脑油的蒸汽裂解工业中,焦炭对管式换热器的污染是一个主要问题。这种不断增长的碳质层有两个主要的负面影响:1) 它增加了压降和 2) 减少了从管壁到被处理流体的热传递。本研究使用开源计算流体动力学软件OpenFOAM,数值研究了不同椭圆截面扭曲管产生的涡流衰减流的壁面剪应力、压降和传热性能。目标之一是确定管道几何形状的微小修改是否可以产生涡流,这可以在减少压降损失的情况下增强壁面剪切应力。对于范围从 10, 000 到 100, 000 的雷诺数,结果表明,在 128% 的压降下,所研究的几何形状可以将传热提高 90%,从而产生 1.44 的性能评估标准 (PEC)。不同几何形状的性能之间的比较是使用基于整体温度的新定义的 PEC 以及通常的 PEC 进行的。

更新日期:2021-08-23
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