1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China 2. Key Laboratory of Ecological Utilization of Multi��metallic Mineral of Education Ministry,Northeastern University, Shenyang 110819, Liaoning, China
DEM Simulation of Solid Flow Including Asymmetric Phenomena in COREX Shaft Furnace
1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China 2. Key Laboratory of Ecological Utilization of Multi��metallic Mineral of Education Ministry,Northeastern University, Shenyang 110819, Liaoning, China
ժҪ Based on the principles of the discrete element method (DEM), a scaled��down model was established to analyze burden descending behavior, including asymmetric phenomena, throughout an entire COREX shaft furnace (SF). The applicability of the DEM model was validated by determining its accordance with a previous experiment. The effects of discharge rate and abnormal conditions on solid flow were described in terms of solid flow pattern and microscopic analysis. Results confirmed that the solid flow of the COREX SF can be divided into four different flow regions; the largest normal force exists at the top of the man��made dead zone, and the weak force network exists in the funnel flow region. The basic solid flow profile was identified as a clear Flat��U��W type. Increasing the discharge rate decreased the quasi��stagnant zone size, but did not affect the macroscopic motion of particles or the shape of patterns above the bustle. For asymmetric conditions, in which particles were discharged at different rates, the solid flow patterns were asymmetric. Under an abnormal condition where no particles were discharged from the left outlet, a sizeable stagnant zone was formed opposite to the working outlet, and ��motionless�� particles located in the left stagnant zone showed potential to increase the period of static contacts and sticking effect.
Abstract��Based on the principles of the discrete element method (DEM), a scaled��down model was established to analyze burden descending behavior, including asymmetric phenomena, throughout an entire COREX shaft furnace (SF). The applicability of the DEM model was validated by determining its accordance with a previous experiment. The effects of discharge rate and abnormal conditions on solid flow were described in terms of solid flow pattern and microscopic analysis. Results confirmed that the solid flow of the COREX SF can be divided into four different flow regions; the largest normal force exists at the top of the man��made dead zone, and the weak force network exists in the funnel flow region. The basic solid flow profile was identified as a clear Flat��U��W type. Increasing the discharge rate decreased the quasi��stagnant zone size, but did not affect the macroscopic motion of particles or the shape of patterns above the bustle. For asymmetric conditions, in which particles were discharged at different rates, the solid flow patterns were asymmetric. Under an abnormal condition where no particles were discharged from the left outlet, a sizeable stagnant zone was formed opposite to the working outlet, and ��motionless�� particles located in the left stagnant zone showed potential to increase the period of static contacts and sticking effect.
��������:the National Key Technology R&D Program during the ��12th Five-Year Plan�� of China;the National Natural Science Foundation of China
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Zhou Heng
E-mail: zhouheng1566@126.com
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Zhi��guo LUO,,Heng ZHOU,,Tao ZHANG,,Yang YOU,,Hai��feng LI,,Zong��shu ZOU,. DEM Simulation of Solid Flow Including Asymmetric Phenomena in COREX Shaft Furnace[J]. �й������ڿ���, 2015, 22(12): 1098-1106.
Zhi��guo LUO,,Heng ZHOU,,Tao ZHANG,,Yang YOU,,Hai��feng LI,,Zong��shu ZOU,. DEM Simulation of Solid Flow Including Asymmetric Phenomena in COREX Shaft Furnace. Chinese Journal of Iron and Steel, 2015, 22(12): 1098-1106.
2015, Vol. 22 
