空气重介质流化床气泡行为及其对分选的影响  

Bubble Performance of Air Dense Medium Fluidized Bed and Its Effects on Coal Preparation

作　　者：徐守坤[1] 管玉平[1] 陈清如[1] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221008

出　　处：《中国矿业大学学报》2001年第3期268-271,共4页Journal of China University of Mining & Technology

基　　金：国家自然科学基金!资助项目 (5 99740 3 0 );高等学校骨干教师资助!计划 ;中国矿业大学科研启动项目

摘　　要：空气重介质干法选煤流化床属于高密浓相稳定鼓泡床 ,气泡的行为直接影响分选效果 .介绍了空气重介质流化床中气泡行为的重要性及特点 ,导出了以气泡体积分率表示的流化床密度表达式 ,分析了气泡对流化床的 6mm实际分选粒度下限的影响 .同时 ,阐述了流化床中介质的返混和颗粒透泡对产品错配的影响 ,并给出了一个不同粒度级分选结果 Ep的实例 .结果表明 :气泡是影响分选精度的重要因素 ,其体积分率的变化与床层密度波动密切相关 .The importance and characteristic of bubbles in an air dense medium fluidized bed (ADMFB) was introduced. The formula expressed by volume fraction of bubbles for the density of ADMFB was derived. The influence of bubbles on the lower size limit of 6 mm was analyzed. Meanwhile, the influence of the reversed mixing of medium and the penetration of particles through bubbles on the misplaced product was also described. Finally, a case example of separating coal with different sizes was given. The result shows that the bubble is an important factor influencing coal with different sizes was given. The result shows that the bubble is an important factor influencing coal separation, and the variation of its volume fraction is closely related to the variation of density of ADMFB.

关 键 词：气泡 空气重介质流化床 干法选煤 体积分率 直径 分选密度 

分 类 号：TD94[矿业工程—选矿] TD455.7