内构件流化床内颗粒停留时间分布及压降的研究  

Particle Residence Time and Pressure Drop in a Fluidized Bed with Internals

作　　者：郝志刚[1,2] 朱庆山[1] 李洪钟[1] 

机构地区：[1]中国科学院过程工程研究所多相反应开放实验室,北京100080 [2]中国科学院研究生院,北京100049

出　　处：《过程工程学报》2006年第z2期359-363,共5页The Chinese Journal of Process Engineering

摘　　要：在一内径100mm设有数块水平挡板、底部连续加料与上部溢流排料的流化床内,采用粒径为0.04～1.0mm的精钛矿颗粒,进行了加料速率、流化气速以及内构件间距等不同因素对物料在床内停留时间及压降影响的实验研究,发现在气固并流向上的流化床内增设水平挡板且d/H=1时,可形成稳定流化状态.研究结果表明流化床中的持料量主要取决于流化气速,平均停留时间随流化气速和进料速率增加而降低.平衡时床内颗粒平均粒径大于进料颗粒的平均粒径,使得床内小颗粒停留时间减少,大颗粒停留时间延长,可满足各种粒度颗粒所需的反应时间.通过简化经验公式计算表明,大而重的颗粒趋于沉积床底,小而轻的颗粒趋于漂浮床顶.实验数据可为此类床型用于气固相加工提供有益参考.The effects of solid feeding rate,fluidizing gas velocity and space between baffles on the particle residence time and pressure drop of the titania slag particles ranging from 0.04 to 1.00 mm were investigated in a fluidized bed with internals and gas-solids countercurrent flow.The experimental results show that better fluidization state can form when the space between baffles equals the diameter of fluidized bed.The weight of particles in the fluidized bed depends on the fluidized gas velocity,and the average residence time decreases with increasing the fluidized gas velocity and the feeding rate.Average particle diameter in the bed at equilibrium state is greater than that of feeding particles,so the particle residence time decreases for the small particles and the particle residence time increases for the large particles.Fluidized bed reactor with internals can provide appropriate reaction time for different particle diameters.

关 键 词：多层流化床 内构件 停留时间 压降 

分 类 号：TQ027.3[化学工程]