Comparison of coal separation characteristics based on different separating approaches in dry coal beneficiation flowsheet
来源期刊：中南大学学报(英文版)2015年第5期
论文作者：HE Jing-feng ZHAO Yue-min HE Ya-qun LUO Zhen-fu DUAN Chen-long
文章页码：1651 - 1659
Key words：separation characteristic; dense medium gas-solid fluidized bed; separating approach; numerical simulation; density stability
Abstract: The separation characteristic of raw coal from Luoyang mining area, China, was investigated by applying a dry coal beneficiation flowsheet with the dense medium gas-solid fluidized bed as main separating equipment. The experimental and simulation results indicate that the dense medium gas-solid fluidized bed can provide uniform distribution and stable fluctuation of bed densities at various heights. Two types of different separating approaches were compared using the dry coal beneficiation flowsheet. Compared with obtaining cleaning coal in the first stage of the flowsheet, a higher yield of the cleaning coal and better separation efficiency can be achieved when discharging gangue in the first stage. Finally, the results indicate that 64.86% pure cleaning coal with an ash content of 11.77% and 13.53% middlings were obtained, and 21.61% gangue was removed in two successive separation stages with the probable errors of 0.05 and 0.07 g/cm3, respectively.
HE Jing-feng(贺靖峰)1, 2, ZHAO Yue-min(赵跃民)1, 2, HE Ya-qun(何亚群)2, LUO Zhen-fu(骆振福)2, DUAN Chen-long(段晨龙)1, 2
(1. School of Chemical Engineering and Technology,
China University of Mining and Technology, Xuzhou 221116, China;
2. Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education
(China University of Mining and Technology), Xuzhou 221116, China)
Abstract:The separation characteristic of raw coal from Luoyang mining area, China, was investigated by applying a dry coal beneficiation flowsheet with the dense medium gas-solid fluidized bed as main separating equipment. The experimental and simulation results indicate that the dense medium gas-solid fluidized bed can provide uniform distribution and stable fluctuation of bed densities at various heights. Two types of different separating approaches were compared using the dry coal beneficiation flowsheet. Compared with obtaining cleaning coal in the first stage of the flowsheet, a higher yield of the cleaning coal and better separation efficiency can be achieved when discharging gangue in the first stage. Finally, the results indicate that 64.86% pure cleaning coal with an ash content of 11.77% and 13.53% middlings were obtained, and 21.61% gangue was removed in two successive separation stages with the probable errors of 0.05 and 0.07 g/cm3, respectively.
Key words:separation characteristic; dense medium gas-solid fluidized bed; separating approach; numerical simulation; density stability
