8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

The chute shape determines the particle trajectory on and leaving the chute, and further affects the burden distribution in blast furnace. Therefore, a three dimensional model of the upper part of serial type bell-less top blast furnace is established based on discrete element method. The effects of chute shape and chute angle on the burden distribution on the chute and at the throat of blast furnace. The results show the main striking point is the largest for semicircle shape chute, followed by trapezoidal shape chute, and the smallest for rectangular shape chute. The burden weight maximum position is further than MSP position and the margin between them increases with the increase of chute angle. The burden thickness at blast furnace throat is the smallest at 20 ° chute angle for semicircle shape chute, and at 30 ° chute angle for rectangular shape chute, and at 40 ° chute angle for trapezoidal shape chute. Semicircle shape chute is beneficial to obtain uniform radial size distribution at 20 ° and 30 ° chute angle, while it is trapezoidal shape chute at 40 ° shape chute. Rectangular shape chute helps to form aggregated burden stream at different chute angles, which is beneficial for practical operation to perform precise burden control. Some optimizations of chute shape are also put forward to provide guidance for practical workers.