气固磁稳定流化床屈服应力的实验研究  

Experimental study of yield stress of gas-solid magnetically stabilized fluidized bed

作　　者：宋树磊[1] 赵跃民[1] 骆振福[1] 唐利刚[2] 

机构地区：[1]中国矿业大学化工学院煤炭加工与高效洁净利用教育部重点实验室,江苏徐州221116 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190

出　　处：《中国矿业大学学报》2011年第6期908-911,共4页Journal of China University of Mining & Technology

基　　金：国家自然科学基金创新研究群体项目(50921002);国家自然科学基金项目(90510002;50774084);江苏省基础研究计划(自然科学基金)-创新学者攀登项目(BK2010002);中央高校基本科研业务费专项资金项目(2010QNB11;2010ZDP01A06);中国博士后科学基金项目(20100480473)

摘　　要：气固磁稳定流化床是分选6～1mm细粒煤的有效手段,屈服应力对气固磁稳定流化床的稳定性和被分选颗粒的运动具有重要影响.采用拉板法,以0.074～0.045mm磁铁矿粉为加重质,对床层的屈服应力进行了研究.结果表明,磁稳定流化床的屈服应力是磁场强度、床层深度和表观气速的函数,分别随磁场强度及床层深度的增加而增大,随流化气速的增大而减小,磁场强度对屈服应力的影响最大,床层深度次之,表观气速影响最小.构建了3个因素对屈服应力的单因素作用模型及综合作用模型,为气固磁稳定流化床分选6～1mm细粒煤提供了理论基础.The gas-solid magnetically stabilized fluidized bed（MSFB） can efficiently beneficiate 6-1 mm fine coal.The yield stress of bed influences greatly the stability of MSFB and the motion of fine coal particles.The yield stress of MSFB was investigated with 0.074-0.045 mm magnetite powder as medium solids using a drawing-plate method.The experimental results show that the yield stress is a function of magnetic intensity,bed depth and superficial gas velocity.The yield stress increases with the increasing of magnetic intensity or bed depth,and decreases with the increasing of gas velocity.The magnetic intensity has a prominent effect on the yield stress,and the bed depth and gas velocity has a minor effect on it,respectively.Additionally,the mathematic model characterizing the relationship between the three factors and the yield stress was proposed.This offers a theoretical foundation for the beneficiation of 6-1 mm fine coal with MSFB.

关 键 词：磁稳定流化床 细粒煤 分选 屈服应力 拉板法 

分 类 号：TD922[矿业工程—选矿]