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.
出处
《化学工程》
CAS
CSCD
北大核心
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)
