圆柱形填料吸附装置内的流体流动特性分析

Analysis of fluid flow characteristics in cylindrical packed adsorption device

摘要

吸附装置是化工生产中用于液相组分分离的常见装置,研究其中液体的流动特性尤为重要.本文探讨了入口流速和填料颗粒尺寸对吸附装置内流速和压力分布等流体特性的影响.通过数值模拟,分析了不同入口流速和不同尺寸圆柱形填料条件下吸附填料床内流速和压力的分布情况.结果表明:吸附填料床的整体压降随入口流速增大而明显增高;当填料颗粒尺寸为200mm时,床层压降明显大于其他尺寸颗粒时的压降;吸附填料床整体流速随入口流速增大而更均匀,在研究的流速范围内,下游中心区域都出现了低速区;填料颗粒较小时,出口流速更均匀,壁面效应小,高速射流区更少.综上所述,吸附填料床的流动特性受入口流速与填料颗粒尺寸共同影响,对其进行优化可有效改善床层内流场分布、降低压降.

Abstract

Adsorption device is a common device used for separating liquid phase components in chemical production, and the study of the flow characteristics of liquids in it is particularly important. This paper investigates the influence of inlet flow velocity and packing particle size on flow velocity and pressure distribution, as well as other fluid characteristics in the adsorption device. Through numerical simulation, the distribution of flow velocity and pressure in the adsorption packed bed under different inlet flow rates and cylindrical packing sizes is analyzed. The results show that the overall pressure drop in the cylindrical packed adsorption bed increases significantly with the increase of inlet flow velocity. When the size of the filler particle is up to 200mm, the pressure drop of the bed is significantly greater than that of other particle sizes. The overall flow velocity of the adsorption packed bed becomes more uniform as the inlet flow velocity increases. Within the range of flow velocities studied, a low-velocity zone appears in the central downstream region in all cases. When the packed particles are smaller, the outlet flow velocity is more uniform, the wall effect is weaker, and there are fewer high-velocity jet zones. In conclusion, the flow characteristics of the adsorption packed bed are jointly influenced by the inlet flow velocity and the particle size of the packed material. Optimizing these parameters can effectively improve the flow field distribution inside the bed and reduce the pressure drop.

关键词

填料床 / 压力分布 / 计算流体力学 / 数值模拟 / 流速

Key words

packed bed / pressure distribution / Computational Fluid Dynamics / numerical simulation / flow velocity

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