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Lagrange-Euler-Euler CFD approach for modeling deep-bed filtration in trickle flow reactors

机译：Lagrange-Euler-Euler CFD方法为滴流反应器中的深床过滤建模

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摘要

A Lagrange-Euler-Euler computational fluid dynamic approach was developed to represent the evolution of two-phase pressure gradients in trickle-bed reactors undergoing deposition of colloidalon-colloidal fines under deep-bed filtration conditions.The ballistic trajectory equation to analyze fines interception was extended to two-phase flows using the inclined slit as the basic collector geometry.New equations for the collection efficiencies and filter coefficients were established for the various filtration stages encountered in single-phase flow and trickle flow regime both for monolayer and multilayer collection mechanisms.These slit-based expressions were established for non-polar and non-electrolytic petroleum-like liquids where there is a need for the refining industry to model deep-bed filtration in multiphase flow.By embedding the new collection efficiency and filter coefficient expressions in an unsteady-state multidimensional computational fluid dynamics code,the deep-bed filtration process in trickle flow reactors was simulated and the increase of pressure drop during plugging was explained by increasing local specific surface area and decreasing local porosity due to fines deposition.The simulations were benchmarked using the experimental pressure drop data and observations of [M.R.Gray,N.Srinivasan,J.H.Masliyah,Pressure build-up in gas-liquid flow through packed beds due to deposition of fine particles,Can.J.Chem.Eng.80 (2002) 346] in their study of kaolinite-kerosene-air flows in trickle-bed reactors.
机译：提出了Lagrange-Euler-Euler计算流体动力学方法，以表示在深床过滤条件下滴流床反应器中经历胶体/非胶体细粉沉积的两相压力梯度的演变。以倾斜狭缝为基本收集器几何形状，将拦截作用扩展到两相流。针对单层和多层收集的单相流和滴流流态中遇到的各个过滤阶段，建立了收集效率和过滤系数的新方程式这些基于狭缝的表达式是针对非极性和非电解类石油液体而建立的，在这种情况下，精炼行业需要对多相流中的深床过滤建模，通过嵌入新的收集效率和过滤系数表达式在非稳态多维计算流体动力学代码中，深床流体对滴流反应器的过滤过程进行了模拟，并通过增加局部比表面积和减少由于细颗粒沉积而引起的局部孔隙率来解释堵塞过程中压降的增加。使用实验压降数据和[MRGray， N.Srinivasan，JHMasliyah，由于细颗粒的沉积，在通过填充床的气液流中压力积累，Can.J.Chem.Eng.80（2002）346]研究高岭石-煤油-空气流在滴流床反应器中。

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