Modelling of CO2 absorption in a rotating packed bed using an Eulerian porous media approach
Modelling of CO2 absorption in a rotating packed bed using an Eulerian porous media approach
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DOI：
10.1016/j.ces.2019.01.029
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发表时间：
2019-05-18
影响因子：
4.7
通讯作者：
Pourkashanian, M.
中科院分区：
文献类型：
--
作者：
Lu, X.;Xie, P.;Pourkashanian, M.
旋转填料床（RPB）具有传质速率高、节省能源和占地面积等优点，是一种很有前途的液态胺捕集CO2反应器。RPB的CFD模拟通常使用流体体积（VOF）方法，但是该方法对于3D模拟是昂贵的，特别是对于大型反应器。欧拉方法是一种很有发展前途的有效方法，但在气液两相逆流流动中存在着多孔介质模型的设置、气液两相界面面积的确定等问题。为了克服欧拉方法中的这些困难，本文采用了一种新的多孔介质模型，一种新的液体生成-消除模型，用于数值研究气液两相逆流流动在RPB和一个新的界面面积模型来自VOF模拟。这些新的模型，结合两膜反应增强传质模型，已成功地模拟了CO2捕获过程中的单乙醇胺（MEA）的解决方案，在低（30重量%）和高（90重量%）浓度条件下的旋转床。结果表明，总气相传质系数K（G）a随转速和液气质量流量（L/G比）的增大而增大。模拟结果与实验数据进行了验证，并对结果进行了分析和讨论。(C)2019爱思唯尔有限公司版权所有。
The rotating packed bed (RPB) is a promising reactor for CO2 capture with liquid amine because of its high mass transfer rate and energy and space savings. The CFD simulations of RPBs generally use the volume of fluid (VOF) method, but this method is prohibitively expensive for 3D simulations, in particular for large-scale reactors. The Eulerian method is a promising and effective method; however, there are still several difficulties, such as the settings for the porous media models in the gas-liquid counter-current flow and the interfacial area between the gas and liquid. To overcome these difficulties in the Eulerian method, this paper uses a new porous media model, a novel liquid generation-elimination model for numerically investigating the gas-liquid counter-current flow in RPBs and a new interfacial area model derived from the VOF simulation. These new models, incorporating the two-film reaction-enhancement mass transfer model, have successfully simulated the CO2 capture process with monoethanolamine (MEA) solutions in a RPB under both low (30 wt%) and high (90 wt%) concentration conditions. The results show that the overall gas phase mass transfer coefficient (K(G)a) increases with increasing the rotation speeds and the liquid to gas mass flow rate (L/G ratio). The simulations were validated by the experimental data and the results were analysed and discussed. (C) 2019 Elsevier Ltd. All rights reserved.