非强制环流混合器中的颗粒速度特性  

Characteristics of Particle Velocity in an Unforced Air-Loop Mixer

作　　者：孟振亮 张博峰[1] 刘梦溪[1] 王维[2] 卢春喜[1] Meng Zhenliang;Zhang Bofeng;Liu Mengxi;Wang Wei;Lu Chunxi(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China;Institute of Process Engineering,Chinese Academy of Science,Beijing 100080,China)

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100080

出　　处：《化学反应工程与工艺》2017年第6期508-520,共13页Chemical Reaction Engineering and Technology

基　　金：国家重点基础研究发展计划973(2012CB215000);国家自然科学基金项目(91534111;91334204;21625605)

摘　　要：为了考察无导流筒的非强制环流混合器的颗粒混合效率,强化颗粒沿径向的混合效果,采用计算流体动力学(CFD)方法,基于能量最小化多尺度(EMMS)的非均匀化曳力模型模拟研究了非强制环流混合器中的颗粒混合方式及相关流场。模拟结果所示:由于导流筒限制消失,颗粒在中心区与边壁区之间流入与流出,增加了颗粒的混合;在混合器底部(h=0.04 m),颗粒由边壁处向中心处流动,而其他高度,颗粒沿径向向外侧运动;由于中心下料管进料的偏流作用,使得颗粒在上部下降管区及h为0.16 m附近截面产生了明显的沿周向运动。在上部下降管区,边壁区的范围随着表观气速以及轴向高度的增加而减小。模拟结果为环流混合器结构的进一步优化提供了依据。In order to investigate the particle mixing efficiency of the unforced air loop mixer without draft tube and to enhance the mixing effect of the particles in the radial direction,a computational fluid dynamics(CFD)method was used to simulate the particle mixing modes and the related flow fields based on the energy minimization multi-scale(EMMS)inhomogeneous drag model.The simulation results showed that particles flowed in and out between the central zone and the side wall due to the disappearance of the draft tube,which strengthened the particle mixing.At the bottom of the mixer(h=0.04 m),particles flowed from the side wall to the center,while at the other heights,the particles moved outward along the radial direction.Due to the biased flow of feed to the central feed tube,the cross section of particles in the upper descending zone near h=0.16 m produced a significant circumferential movement.In the upper descending pipe area,the range of the side area decreased with increase of the apparent gas velocity and the axial heights.The simulation results provided the basis for further optimization of the structure of the air-loop mixer.

关 键 词：环流混合器 颗粒速度 能量最小化多尺度模型 计算流体力学 气固两相 

分 类 号：TQ051[化学工程]