摘要
对各种不同物料在上部内径为 195mm柱状 ,下部为 60°锥体并水平引入辅助气的喷流 移动床中的流动特性进行了研究。实验结果发现 ,床层压降随着水平辅助气速的增大而呈线性增大 ,而在喷动状态 ,一定范围内的喷动气速变化对压降基本没有影响。最小喷动气速随着水平辅助气速的增加而逐渐减小 ,修改后的关联式的计算结果能够较好地与实验结果相符合。随着辅助气速和喷动气速的改变 ,可观察到床中粒子处于固定床、稳定喷动床、脉动喷动床、腾涌床四种不同的流动状态。
Experiments were carried out in a spouted bed of ID 195?mm plexiglass column with a 60° conical base and horizontally introduced auxiliary gas. The results indicate that the pressure drop increases with increasing auxiliary gas velocity, while spouting gas velocity shows little effect on the pressure drop when particles are spouted. The minimum spouting gas velocity decreases with increasing horizontal auxiliary gas velocity. An empirical equation for minimum spouting gas velocity is modified to fit the experimental data. Four flow regime as packed bed, spouting-moving bed, spouted bed with pulsation and slugging bed are observed when auxiliary and spouting gas velocities are changed into different levels.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2001年第4期334-338,共5页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金 ( 2 98760 41)&&
