气体分布器结构对气升式环流反应器内气液两相流动的影响  

Effect of Gas Sparger Geometry on Gas-Liquid Two-Phase Flow in an Airlift Loop Reactor

作　　者：沈荣春[1] 束忠明[1] 黄发瑞[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《化学反应工程与工艺》2007年第5期422-429,共8页Chemical Reaction Engineering and Technology

摘　　要：使用欧拉两流体模型研究气体分布器结构对气升式环流反应器内气液两相流动的影响,预测了环己烷氧化反应器内单环结构、三环结构、五环结构的气体分布器时反应器内液相速度分布、气含率分布、液相循环速度以及液相微观混合特性。模拟结果表明,在等量的进气流量下,气体分布器环数增加,液相速度分布和气含率分布更趋均匀;气体分布器环数增加,液相推动力增加,从而使得液相循环速度增加,液相的宏观混合效果增强;气体分布器环数增加,导流筒内外的平均气含率增加。随机游走模型模拟结果表明,气升式环流反应器与普通鼓泡床反应器对气体分布器结构要求不同。Eulerian two flow model was applied to simulate the effect of gas sparger geometry on gas-liquid two-phase flow in an airlift loop reactor （ALR）. The effect of different gas sparger geometry （single ring, three ring, five ring） on liquid velocity distribution, gas hold-up distribution and liquid mixing characteristics was predicted by Computational Fluid Dynamics （CFD） simulation. The results showed that liquid velocity and gas hold-up distributed more homogenously, impetus for liquid also increased which enchances liquid circulating velocity and the macro-mixing efficiency thereby, and gas hold-up in the riser and in the downcomer increased when gas sparger rings number increased under the same amount of feeding gas. Discrete random walk model showed that gas sparger ring also apparently affected liquid micro-mixing characteristics in the reactor, the requirements of ALR and common bubble column for sparger ring geometry are different from each other because of different liquid mixing processes in them.

关 键 词：气升式环流反应器 气体分布器 气液两相流 计算流体力学 模拟 

分 类 号：TQ021.1[化学工程]