非磁性粘性颗粒在添加磁性大颗粒磁场流化床中的流化性能  

Characteristics of Non-Magnetic Cohesive Particles by Adding Coarse Magnets in Magnetic Fluidized Beds

作　　者：周涛[1] 葛志强[1] Rajesh Dave Robert Pfeffer 

机构地区：[1]中南大学化学化工学院 [2]New Jersey Center for Engineered Particulates,New Jersey Institute of Technology,Newark,NJ 07102

出　　处：《化学反应工程与工艺》2005年第1期22-26,共5页Chemical Reaction Engineering and Technology

摘　　要：通过添加磁性大颗粒,破碎活塞及沟流,显著改善了非磁性粘性颗粒在磁场流化床中的流化性能。为了评价非磁性粘性颗粒在磁场流化床中的流化性能,测量了最小流化速度、床层压力降和床膨胀高度。实验结果表明,非磁性粘性颗粒的最小流化速度,由于添加磁性大颗粒,而显著降低。磁性大颗粒添加量对非磁性粘性颗粒的最小流化速度有较大影响,随磁性大颗粒添加量的增加,最小流化速度降低,但当磁性大颗粒添加量增大到40%后,非磁性粘性颗粒和磁性大颗粒的混合物的最小流化速度就不再降低。The fluidization behavior of non-magnetic cohesive particles in a magnetic fluidized bed was investigated. In order to determine the influence of coarse magnetic powder amount on the fluidization characteristics of non-magnetic cohesive powders, the minimum fluidization velocity and pressure drop were measured. The experimental results showed that the minimum fluidization velocity decreases significantly by adding coarse magnetic powders in the magnetic fluidized bed of non-magnetic cohesive particles since coarse magnetic powders can break up the plug and channel. Moreover, the minimum fluidization velocity of cohesive particles decreases with increasing the amount of coarse magnetic powders, but there is no any change for the minimum fluidization velocity after the amount of coarse magnetic powders is in excess of 40%.

关 键 词：磁场流化床 粘性颗粒 流化性能 大颗粒 非磁性 最小流化速度 床层压力降 添加量 速度降 混合物 沟流 

分 类 号：TQ051.13[化学工程] TQ026.7