Study on the characteristics of pellet movement under different roasting temperature in hopper

Roasting temperature plays an important role in the chemical reaction of vanadium-titanium magnetite. In order to investigate the effect of roasting temperature on pellet motion characteristics, a non-cohesive and multi element particle model of discrete element method (DEM) was constructed. On this basis, different diameter pellets (d(p) = 20.38 mm, 25.02 mm, 29.67 mm, 35.52 mm) with different roasting temperature (298 K <= T <= 1473 K) were selected to explore the effects on pellet velocity distribution, discharge mass flow rate, wall pressure and average voidage. Our results reveal a large change in the movement characteristics of pellets involving chemical reactions during high-temperature production. The mean voidage is negatively correlated with the diameter. The minimum deviations of pellet velocity distribution and discharge mass flow rate at different roasting temperature were 20.16% and 21%, respectively, and the maximum deviations of wall pressure and average voidage were 63.47% and 7.0%, respectively. (C) 2021 Elsevier B.V. All rights reserved.