液固流化床中物料属性对固体混合物分布的影响  

Effect of properties of materials on solids distribution in a binary mixture liquid-solid fluidized bed

作　　者：楚振峰[1,2] 解京选[2] 李延锋[2] 

机构地区：[1]江苏中核华纬工程设计研究有限公司,江苏南京210019 [2]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》2012年第4期620-623,共4页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50904069);中国矿业大学青年基金项目(2008A028)

摘　　要：利用窄粒度和窄密度分布的石英砂和细粒煤作为实验物料,在液固流化床中进行了两种物料混合物的流化实验研究.结果表明,轻物料的自由沉降速度大于重物料的自由沉降速度是颗粒群发生完全混合和反分层的必要条件,提出了双物料混合物能否发生完全混合的判据;在双物料混合物中,当两种物料的有效密度比与粒度比的比值(ρe1/ρe2)/(d2/d1)大于1.5时,两种物料才能发生完全混合,并且该比值越大,完全混合越容易发生.Taking the mixture of quartz sand fine coal with narrow size and density distribution as experimental materials, the fluidization tests were completed at different conditions in a la- boratory-scale liquid-solid fluidized bed. The results show that the necessary condition to mix completely and inverse-layer is that the free settling velocity of light particles should be larger than that of heavy particles. A criterion is proposed to judge whether the complete mix could occur. The binary mixture could mix completely when the ratio value （ρe1/ρe2）/（d2/d1） is bigger than 1.5, and the larger the ratio is, the easier the mix occurs.

关 键 词：液固流化床 反分层 沉降速度 

分 类 号：TQ028.9[化学工程]