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A three-dimensional two-phase flow model with phase change inside a tube of petrochemical pre-heaters

机译：石油化工预热器管内具有相变的三维两相流动模型

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摘要

The transport of fluids in industrial units takes place usually inside cylindrical ducts. Multiphase systems flowing inside pipes are very common and many times there are also mass, energy and momentum transfer. Two-phase flow is found in many petrochemical processes, as is the case of preheating furnaces where normally the liquid vaporizes as it flows inside the heater. In the great majority of these heaters, there is a phase change from liquid to gas. The objective of this work is to simulate the two-phase gas-liquid flow of crude oil inside pipes of petrochemical fired heaters with the use of a Computational Fluid Dynamics (CFD) model to be later used in the prediction of coke formation through a thermal cracking model and a ternary solubility diagram for the petrol feed, according to Souza et al. [28]. The CFD free software OpenFOAM was used. There is a growing interest in the use of the OpenFoam project and many successful models have been implemented using this software. New routines were implemented to estimate temperature and concentration inside the tube, taking into consideration the interaction between the phases. To estimate the momentum it was used a phase intensive formulation for dispersed two-phase flow already implemented in OpenFOAM. The temperature profiles were predicted. The k-epsilon model was used to describe the turbulence and a vaporization model was implemented to estimate the phase change. A kinetic reaction net for crude oil with seven lumps was used in order to predict the thermal cracking of the crude oil.
机译：工业设备中的流体运输通常在圆柱形管道内进行。在管道内流动的多相系统非常普遍，而且很多时候还存在质量，能量和动量传递。在许多石化工艺中都发现了两相流，就像预热炉一样，通常情况下，液体在加热器内部流动时会蒸发。在这些加热器的绝大多数中，都有从液体到气体的相变。这项工作的目的是使用计算流体动力学（CFD）模型模拟​​石化燃烧加热器管道内原油的两相气液流动，该模型随后将用于通过热法预测焦炭的形成据Souza等人所述，汽油原料的裂解模型和三元溶解度图。 [28]。使用了CFD免费软件OpenFOAM。人们对OpenFoam项目的使用越来越感兴趣，并且已经使用该软件实现了许多成功的模型。考虑到各相之间的相互作用，采用了新的程序来估算管内的温度和浓度。为了估计动量，它使用了OpenFOAM中已实施的分散相两相流的相密集公式。预测温度曲线。 k-ε模型用于描述湍流，汽化模型用于估算相变。为了预测原油的热裂解，使用了具有七个块的原油的动力学反应网。

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  • 来源
    《Fuel》 |2013年第8期|196-203|共8页
  • 作者

    D.V.R. Fontoura; E.M. Matos; J.R. Nunhez;

  • 作者单位

    School of Chemical Engineering, State University of Campinas, UNICAMP, 13083-852, Campinas-SP, Brazil;

    School of Chemical Engineering, State University of Campinas, UNICAMP, 13083-852, Campinas-SP, Brazil;

    School of Chemical Engineering, State University of Campinas, UNICAMP, 13083-852, Campinas-SP, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CFD modeling; Two-phase flow; Phase change; Coke formation; Fired heater;

    机译：CFD建模;两相流;相变焦炭形成;加热加热器;

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