气液固三相逆流化床内气液传质特性的实验研究和数值模拟

万东玉， 刘金平， 李志坤， 曹长青*

(青岛科技大学 化工学院，山东 青岛 266042)

 摘要： 基于欧拉双流体模型，对液固两相进行拟均相处理，应用计算流体动力学(CFD)软件Fluent 63，对气液固三相逆流化床内气液传质特性进行了实验研究和数值模拟，考察了床内溶解氧浓度的轴径向分布规律，气液表观速度和液体黏度对气液传质系数的影响。从实验和模拟结果发现：在轴向上，溶解氧浓度由上到下逐渐增加并趋于饱和；在径向上，溶解氧浓度中心区域低，壁面附近高；气液传质系数随气液表观速度增加而增加，随液体黏度增加而减小，模拟值和实验值吻合较好。

 关键词： 逆流化床； 传质； 数值模拟； 多相流模型

 中图分类号： O 359                            文献标志码： A

Numerical Simulation and Experimental Study of GasLiquid Mass Transfer Characteristics in GasLiquidSolid Threephase Inverse Fluidized Beds

WAN Dongyu, LIU Jinping, LI Zhikun, CAO Changqing

(College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: The mass transfer characteristics between gas phase and liquid phase were experimentally studied and numerically simulated considering solid phase and liquid phase as a pseudofluid based on Euler twofluid model using the CFD code Fluent 63 in a gasliquidsolid three phase inverse fluidized bed. The distribution law of dissolved oxygen concentration at axial and radial directions and effects of gas and liquid superficial velocity and liquid viscosity on mass transfer coefficient were determined. The simulation and experiment results show that dissolved oxygen concentration increases and tends to be saturate along axial direction from up to down. And dissolved oxygen concentration is lower in the center region than that near the wall region in the radial direction. The gasliquid mass transfer coefficient increases with gas or liquid superficial velocity increasing, but decreases with liquid viscosity increasing. The numerical simulation results  agreed with the experimental date.

Key words: inverse fluidized bed; mass transfer; numerical simulation; multiphase fluid model

收稿日期： 20130924

作者简介： 万东玉(1987—)，男，硕士研究生.              *通信联系人.