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

Abstract

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.

Keywords

pulsing air / coarse coal slime / DEM-CFD / separation

References

[1] GalvinK P, DoroodchiE, CallenA M, LamberN, PrattenS J. Pilot plant trial of the reflux classifier [J]. Minerals Engineering, 2002, 15(1): 19-25

[2] LiY-fengStudy on the separation mechanism and application of liquid-solid fluidized bed coarse slime separator [D], 2008Xuzhou, ChinaUniversity of Mining and Technology

[3] GuiX-h, LiY-f, LiuJ-t, WangY-t, CaoY-jun. Study on settlement characteristic of the grain in fluidized bed [J]. Journal of China Coal Society, 2010, 35(8): 1374-1379

[4] ChenY-l, LiuW-l, MaK-f, YaoJ-yin. Numerical simulation of the flow field in the teetered bed separator [J]. Journal of China University of Mining and Technology, 2011, 40(4): 608-611

[5] TangL-g, ZhuQ-s, DuanC-l, XuC-yan. Simulation study of particulate fluidization characteristics of fine coals in hindered fluidized bed [J]. Journal of China University of Mining and Technology, 2012, 41(1): 86-90

[6] ShenL-j, ChenJ-z, ZhuX-b, ZhaoJ-h, LiuB-c, HuangW-f, NieQ-q, SunWei. Research on ZK-LX1100 spiral separator separating coarse coal slime [J]. Coal Preparation Technology, 2009, 12(6): 16-20

[7] ChenJ-z, ShenL-j, DaiH-z, ZhangPeng. Research on the beneficiation of coarse coal slime by the HM cyclone for the coarse coal slime [J]. Coal Preparation Technology, 2010, 8(4): 48-50

[8] ZhaoY-m, TangL-g, LuoZ-f, LiangC-c, XingH-b, WuW-c, DuanC-long. Experimental and numerical simulation studies of the fluidization characteristics of a separating gas-solid fluidized bed [J]. Fuel Processing Technology, 2010, 91(12): 1819-1825

[9] ZhaoY-m, LiuX-j, LiuK-l, LuoZ-f, WuW-c, SongS-l, TangL-gang. Fluidization characteristics of a gas-paigeite-powder bed to be utilized for dry coal beneficiation [J]. International Journal of Coal Preparation and Utilization, 2011, 31(3/4): 149-160

[10] ZhaoY-m, LuoZ-f, ChenZ-q, TangL-g, WangH-f, XingH-bo. The effect of feed-coal particle size on the separating characteristics of a gas-solid fluidized bed [J]. Journal of the South African Institute of Mining and Metallurgy, 2010, 110(5): 219-224

[11] ZhaoY-m, LiG-m, LuoZ-f, LiangC-c, TangL-g, ChenZ-q, XingH-bo. Modularized dry coal beneficiation technique based on gas-solid fluidized bed [J]. Journal of Central South University of Technology, 2011, 18(2): 374-380

[12] LuoZ-f, ZhaoY-m, ChenQ-r, FanM-m, TaoX-xiang. Separation characteristics for fine coal of the magnetically fluidized bed [J]. Fuel Processing Technology, 2002, 79: 63-69

[13] HeY-q, ZhaoY-m, DuanC-l, WangH-f, ZuoW-ran. Classification mechanism and airflow simulation of active pulsing air separation [J]. Journal of Central South University: Science and Technology, 2009, 40(5): 1199-1204

[14] DuanC-l, HeY-q, ZhaoY-m, HeJ-f, WenB-feng. Development and application of the active pulsing air classification [J]. Procedia Earth and Planetary Science, 2009, 1(1): 667-672

[15] ChuK W, WangB, YuA B, VinceA. CFD-DEM modeling of multiphase flow in dense medium cyclones [J]. Powder Technology, 2009, 193: 235-247

[16] MansourpourZ, KarimiS, ZarghamiR, MostoufiN, RahmatS G. Insights in hydrodynamics of bubbling fluidized beds at elevated pressure by DEM-CFD approach [J]. Particuology, 2010, 8: 407-414

[17] ChuK W, WangB, XuD L, ChenY X, YuA B. CFD-DEM simulation of the gas-solid flow in a cyclone separator [J]. Chemical Engineering Science, 2011, 66: 834-847

[18] HeY-q, ZhaoY-minTechnology of pulsing air separation [M], 2009Beijing, ChinaChemical Industry Press115-118

[19] WuC N, ChengY, DingY L, JinY. CFD-DEM simulation of gas-solid reacting flows in fluid catalytic cracking (FCC) process [J]. Chemical Engineering Science, 2010, 65: 542-549

[20] YinL, JiangJ C. DEM-CFD Simulation of fluidized characteristics for group Geldart’s A particles under couple’s boundary condition [J]. Chemical Reaction Engineering and Technology, 2010, 26(5): 411-417

[21] HuG-mingAnalysis and simulation of granular system by discrete element method using EDEM [M], 2010WuhanWuhan University of Technology Press7-10

[22] XieG-y, ZhangM-x, BianB-x, FanM-qiangMineral processing [M], 2010XuzhouChina University of Mining and Technology304-306

[23] LuL-tao. Application of TBS in Liangbei coal mine [J]. Coal, 2008, 17(8): 20-22