顺流下行气固两相系统流体力学特性研究  

HYDRODYNAMIC CHARACTERISTICS OF G/S COCURENT DOWNFLOW SYSTEMS

作　　者：陈丙瑜[1] 夏麟培[1] 

机构地区：[1]中国科学院化工治金研究所,北京100080

出　　处：《化工冶金》1993年第3期252-259,共8页

基　　金：国家自然科学基金

摘　　要：本文研究了在气固两相顺流下行系统中固体加速运动的流动特性.从流体与颗粒絮团间的相互作用关系建立了顺流下行气固两相流动基本运动方程,将固体的运动分为三个区域进行分析研究:(1)第一加速段,颗粒絮团被加速到与气体速度相等,从 u_s~*=u_0到 u_s~*=u_f;(2)第二加速段,从 u_s~*=u_f;加速到 u_s~*=u_(sc)~*;(3)絮团匀速下降.分别对层流、湍流和过渡区,定量地予测进口端加速段影响区的长度,并分析了固体物料特性,形成团絮状物的大小、结构、形状,加料率及操作气速等的影响.在直径φ65mm 高7m 及φ32mm 高5m 的冷模试验装置中,用 FCC 及Al_2O_3为实验物料的实验结果较好的验证了本文的理论分析.Accelerative motion of fine particulates has been investigated for the cocur- rent downflow systems,in which fine particles trend to agglomerate forming loosely connected clusters. Process of the accelerative motion of clusters in G/S cocurrent downflow systems may be divided into 3 regions.In the first region,the clusters are accelerated from u_(sc)=U_(sco)to u_(sc)=u_f. In the second region,clusters are accelerated from u_(sc)=u_f to u_(sc)=uf+u_(tc).In the third region, the clusters move with a constant velocity. The analytic solutions of the dynamic equation in conjunction with the attribute param- eters of the G/S system and the boundary conditions are given for different flow reqions.The effect of cluster characteristics and operating conditions on the length of acceleration zone are discussed. The experimental results are coincident with theoretical anaysis.

关 键 词：顺流下行 絮团 流体力学特性 

分 类 号：TB13[理学—物理]