磁性纳米Fe_3O_4在刁润磁丽场协助作用下的流态化研究  

Fluidization Research of Magnetic Fe_3O_4 Nano-particles in a Magnetic Fluidized Bed

作　　者：刁润丽[1] 周涛[2] 王辉[2] 章锋[2] 

机构地区：[1]河南质量工程职业学院食品与化工系,河南平顶山467000 [2]中南大学化学化工学院,湖南长沙410083

出　　处：《广东化工》2010年第10期24-26,共3页Guangdong Chemical Industry

摘　　要：磁性纳米Fe3O4的密度及黏性较大,透气性差,在传统流化床中很难实现"正常"流态化。实验采用外加磁场能的方法来改善这种状况,外加磁场、铁磁性大颗粒并与流化性能较好的非磁性物料混合流化。实验发现在一定磁场强度、添加质量分数及表观气速下,纳米Fe3O4的流化性能得到改善,其在流化床中形成的大聚团得到有效的破碎,床层膨胀增加,压降趋于一个稳定值,最小流化速度降低,床层可以实现比较均匀的流化。The narmal fluidization of magnetic Fe3O4 nano-particles was difficult to realize, for its density and viscosity were very high and permeability was poor. Magnetic fluidized bed （MFB） by adding coarse magnets was introduced to improve the fluidization quality, even the mixture of non-magnetic and magnetic nano-particles. The fluidization of Fe3O4 nano-particles was improved in the appropriate magnetic-field intensity, mass fraction and superficial gas velocity. The large agglomerate could be broken up effectively. The bed expression ratio was increased. The pressure drop reached steady. The minimum fluidization velocity was decreased. So the homogeneous fluidization was achieved.

关 键 词：磁丝纳米颗粒 磁场流化床 零团 磁性大颗粒 

分 类 号：TQ[化学工程]