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. [Display omitted] • The deviations of pellet motion at different temperatures were explored by DEM. • The average variance of particle movement velocity is logarithmic to the D / d p. • The effect of temperature on wall pressure is positively correlated with pellet size. • The average voidage has a positive correlation with the pellet equivalent diameter. [ABSTRACT FROM AUTHOR]