水平辅助气对喷动床流动特性影响的研究  

Study on the Effect of Horizontal Auxiliary Gas on the Flow Characteristics of Spouted Bed

作　　者：王志奇[1] 陈平[1] 李海滨[1] 吴创之[1] 陈勇[1] 李保庆[2] 

机构地区：[1]中国科学院广州能源研究所,广东广州510070 [2]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001

出　　处：《化学工程》2002年第5期38-43,共6页Chemical Engineering(China)

基　　金：国家自然科学基金 (No.2 9876 0 41)

摘　　要：在上部内径为 195mm柱状、下部为 6 0°锥体的喷动床中水平引入辅助气 ,考察了水平辅助气对流动特性的影响。实验结果发现 ,辅助气的水平引入比竖直或法向引入可以更有效地抑制喷动气体向环流区扩散 ,降低最小喷动气速。在总气速一定的条件下 ,增大辅助气速的比例 ,可以降低喷动区空隙率而使颗粒浓度增大 ,提高颗粒的循环流动量。相比而言 ,喷动气速对喷动区颗粒的流动速度影响较大 。Experiments were carried out in a spouted bed of ID 195mm plexiglass column with a 60° conical base, and auxiliary gas was introduced horizontally. The experimental results show that horizontal introduction of auxiliary gas has more effectiveness on the minimum spouting gas velocity than vertical introduction of auxiliary gas. The former can decrease the minimum spouting velocity than the later. With increasing the proportion of auxiliary gas velocity for a fixed total gas velocity, the voidage in the spout decreases which means more circulation of particles. Comparatively, spouting gas velocity has distinct effect on the particle velocity in the spout, but auxiliary gas velocity affects the particle velocity in the annulus markedly.

关 键 词：水平辅助气 喷动床 流动特性 影响 研究 最小喷动气速 床层空隙率 颗粒速度 

分 类 号：TQ021[化学工程]