Effect of coal particle swarm properties on the fluidization characteristics and coal beneficiation in a dense-phase gas-solid fluidized bed
Effect of coal particle swarm properties on the fluidization characteristics and coal beneficiation in a dense-phase gas-solid fluidized bed作者机构：Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education China University of Mining & Technology Xuzhou 221116 China School of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221116 China
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2017年第15卷第6期
页 面：108-118页
核心收录：
学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）]
基 金：financial support from the Jiangsu Natural Science Fund-Youth Fund the Fund of State Key Laboratory of Mineral Processing Fundamental Research Funds for the Central Universities the Research Fund for the Postdoctoral Program 江苏高校优势学科建设工程
主 题：Coal separation Particle size distribution Fluidized bed Separation performance
摘 要：This paper analyzes the influence of different coal mass fraction in an air dense medium fluidized bed （ADMFB）. The effect of the low density particles layer on heavy sedimentation increased with increasing material layer thickness. The thickness of the low density particles layer also affected the final settling time of the high densiW particles. Increasing the thickness of the low density particles layer by △h provoked an increase in the settling of high density particles that was related to their diameter （△h/D）. The pressure gradient across the bed was lower than that observed for the control experiment, which had only the dense material, owing to a decrease in the pressure gradient in Zones 1 and 5 （at the top and bottom of the bed, respectively）. Introducing different coal sizes resulted in different fluidization environments, particle accumulation layers, and changes to the surrounding zone. However, the influence of the coal particles on the local bed characteristics was related to its concentration. The feeding mass fraction of 6-13mm size and 13-25mm size coal should be limited to10% and 13%, respectively. The ranges of possible deviation were found to be 0.08-0.15 and 0.07-0.10 for the respective samples.
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