DEM Simulation of Solid Flow Including Asymmetric Phenomena in COREX Shaft Furnace

作者：Luo Zhi guo; Zhou Heng; Zhang Tao; You Yang; Li Hai feng; Zou Zong shu

来源：Journal of Iron and Steel Research International, 2015, 22(12): 1098-1106.

DOI：10.1016/s1006-706x(15)30118-7

• COREX shaft furnace
• solid flow
• discrete element method
• asymmetric phenomena

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.

• 出版日期2015-12
• 单位东北大学