Effect of the distributor plugging ways on fluidization quality and particle stratification in air dense medium fluidized bed  

作　　者：Zhonglin Gao Xuesen Chai Enhui Zhou Ying Jia Chenlong Duan Ligang Tang 

机构地区：[1]Key Laboratory Coal Processing and Efficient Utilization of Ministry of Education,School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China [2]School of Environment Engineering,North China Institute of Science and Technology,Sanhe 065201,China

出　　处：《International Journal of Mining Science and Technology》2020年第6期883-888,共6页矿业科学技术学报（英文版）

基　　金：the National Natural Science Foundation of China-Xinjiang Joint Foundation(No.U1903132);National Natural Science Foundation of China(No.51904298).

摘　　要：Gas-solid fluidized bed separation is a highly efficient and clean technique for coal separation,and can effectively remove ash and sulfur contained gangue minerals from coal.However,the fine coal plugging distributor often leads to uneven fluidization and affects the separation effect.In this paper,different plugging ways were designed to study their effects on the fluidization characteristics and particle mixing.It was found that when the plugging phenomenon occurs,the minimum fluidization velocity of the fluidized bed gradually decreases as the plugging area enlarges.The difference between the top and the bottom of the bed minimum fluidization velocity increases accordingly,and a“stagnation phenomenon”occurs in the bed.The standard deviation of pressure fluctuations at the top of the bed is smaller than that at the bottom of the bed,which is the opposite of normal conditions.As the area of the plugging increases,the dead zone on the side wall of the fluidized bed significantly increases.The size of the dead zone is rapid reducing at the initial stage.It was noticed that the stratification of the low-density products is particularly affected by plugging,whereas the stratification of high-density products is not obviously influenced by certain conditions.

关 键 词：Dry separation DISTRIBUTOR Plugging Particle mixing 

分 类 号：TD94[矿业工程—选矿]