加压条件下气固流化床流动特性的CFD模拟研究  

The CFD simulation study of flow characteristics of three dimension flow in a fluidizedbed reactor at elevated pressure

作　　者：黄克松 赵晓军[1] 杨敬一[1] 徐心茹[1] 

机构地区：[1]华东理工大学化工学院石油加工研究所,上海200237

出　　处：《计算机与应用化学》2014年第2期181-184,共4页Computers and Applied Chemistry

摘　　要：本文利用CFX模拟软件,考察了加压流化床内的三维流动特性,分析压力对床层沿床压降、固含率轴径向分布、颗粒速率以及气泡行为等方面的影响。结果表明,升高压力能够提高床层膨胀高度,降低床层固含率。在床层底部,升高压力对中心区域和壁面附近的固含率都会有明显影响,而在床层中部则主要使壁面附近固含率降低。同时,升高压力会明显增加床层底部的颗粒向上和向下速率,并且会使床层内气泡数量增加,气泡会出现频繁的合并与破裂。This paper focuses on the characteristics of three dimension flow in a fluidizedbed reactor at elevated pressure and the effect of pressure on the pressure drop, axial and radial distribution of solid holdup, particle velocity and bubble characteristics were analysed. It was found that at elevated pressure the bed axpansion ratio increases and the solid holdup decreases. At the bottom of the bed, the elevated pressure leads to the increase of solid holdup both in the center and near the wall. However, the iurease of pressure mainly decreases the solid holdup near the wall. In addition, upward and downward velocity of particles at the bottom of the bed increases at elevated pressure. The elevated pressure leads to the increase of bubble numbers and coalescence and breakup of the bubble.

关 键 词：加压流化床 CFD模拟 固含率 颗粒速率 气泡 

分 类 号：O359.1[理学—流体力学]