空气重介质流化床中入料颗粒的受力特性  

Characteristics of forces on the feed particles in the air dense medium fluidized bed

作　　者：贺靖峰[1] 赵跃民[1] 何亚群[1] 骆振福[1] 段晨龙[1] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221116

出　　处：《中国矿业大学学报》2013年第1期69-75,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金委员会创新研究群体科学基金项目(50921002);国家重点基础研究发展计划(973)项目(2012CB214904);国家自然科学基金重点项目(51134022);国家自然科学基金项目(51174203;51074156)

摘　　要：入料颗粒在空气重介质流化床中所受合力是决定颗粒运动行为与分离特性的关键.在理论分析的基础上,建立了入料颗粒在流化床中运动时的受力平衡方程.采用自行研制的颗粒受力测量装置,对不同粒径示踪颗粒在流化床中的受力变化进行了准确测量,结果表明:对粒径为8～10mm、密度为7 850kg/m3的球形颗粒,在以0.3～0.1mm高密度磁铁矿粉作为加重质形成的稳定流化床中,其受力稳定,并与理论计算符合良好.The resultant forces on the feed particles in the air dense medium fluidized bed are pivotal to their dynamical behavior and separation characteristics. Based on the theoretical anal-ysis of forces on a single feed particle, we established the force balance equation for its motion in the fluidized bed. A dedicated measurement system was developed to measure the forces ondifferent tracer particles in the fluidized bed. The results indicate that the particles of 8-10 mm size and 7850 kg/m3 density experience steady resultant forces in the fluidized bed using thehigh-density magnetite powder of 0. 3-0. 1 mm size as medium solids, which are well predicted by the proposed force balance equation.

关 键 词：空气重介质流化床 入料颗粒 理论计算模型 受力 

分 类 号：TD922.4[矿业工程—选矿]