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Insights in active pulsing air separation technology for coarse coal slime by DEM-CFD approach

Journal of Central South University 2013年第12期20卷 3660-3666页

作者：董良赵跃民谢卫宁段晨龙李浩华成鹏 School of Chemical Engineering and Technology China University of Mining and Technology

To research a novel technology for dry coarse coal slime beneficiation and extend its application, active pulsing air separation technology was investigated by DEM-CFD coupling simulation approach. The results show that the ash content of feed is reduced by 10% 15% and the organic efficiency is up to 91.78% by using the active pulsing air separation technology. The gas solid flow in the active pulsing air classifier was simulated. Meanwhile, the characteristics of particle motion and the separation process of different particles were analyzed, and the mechanical structure of the classifier was also modified to achieve high separation efficiency. Therefore, a novel high-efficiency dry beneficiation technique was advanced for coarse coal slime.

关键词： pulsing air coarse coal slime DEM-CFD separation

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The influence of discharge style on the separation of coarse coal slime by a hindered fluidized bed

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Journal of coal Science & Engineering(China) 2012年第1期18卷 96-100页

作者： Sha, Jie Xie, Guang-yuan Tang, Li-gang Peng, Yao-li Zhang, Xiu-feng 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

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.

关键词： discharge style coarse coal slime hindered fluidized bed liquid distributor

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