The influence of discharge style on the separation of coarse coal slime by a hindered fluidized bed
The influence of discharge style on the separation of coarse coal slime by a hindered fluidized bed作者机构：School of Chemical Engineering and Technology China University of Mining and Technology Xuzhou China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing China Dadi Engineering Development (Group) Co. Ltd. Tianjin China
出 版 物：《Journal of Coal Science & Engineering(China)》 (煤炭学报（英文版）)
年 卷 期：2012年第18卷第1期
页 面：96-100页
学科分类：080706[工学-化工过程机械] 082304[工学-载运工具运用工程] 08[工学] 0807[工学-动力工程及工程热物理] 080204[工学-车辆工程] 0802[工学-机械工程] 0823[工学-交通运输工程]
基 金：Supported by the National Natural Science Foundation of China the China Postdoctoral Science Foundation
主 题：discharge style coarse coal slime hindered fluidized bed liquid distributor
摘 要：Two kinds of liquid distributor, a central discharge or a peripheral discharge, were designed into a hindered fluid- ized bed separator. The beneficiation performance of the fluidized bed was investigated using 0.25-1.00 mm coarse coal slime and the two different distributors. The experimental results show that the heterogeneity of axial particle velocity in the radial direction of the bed can be reduced by a distributor that has a central discharge. The beneficiation performance for this dis- tributor is improved relative to the distributor with the peripheral discharge. This indicates that it is necessary to eliminate or suppress the core-annulus structure within a hindered fluidized bed. Increasing superficial water velocity causes the clean coal ash content, the railings ash content, and the combustible recovery to increase. Additionally, increasing the bed height decreases all of these three indexes. The optimum superficial water velocity and bed height for a 0.25-1.00 mm coal feed were deter- mined to be 3 mm/s and 800 mm, respectively. This work provides a foundation for the scale-up of the bed.
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