DEM Modelling of Multi-Component Segregation in the Blast Furnace Charging System
A.H. Hadi (TU Delft - Mechanical Engineering)
D.L. Schott – Promotor (TU Delft - Mechanical Engineering)
Y. Pang – Copromotor (TU Delft - Mechanical Engineering)
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Abstract
Segregation, or de-mixing, is a significant challenge in the handling and processing of granular materials. It can lead to several problems, including inconsistent product quality, poor flowability, and process inefficiencies. In blast furnace steelmaking, segregation of the ferrous mixture (consisting of pellets, sinter, lump ore, and nut coke) causes uneven distribution of mixture components at the furnace throat. This reduces permeability and disrupts the gasburden interaction, which is critical for stable and efficient operation. Therefore, understanding segregation is essential. The Discrete Element Method (DEM) offers a powerful way to investigate segregation, particularly in the blast furnace, where direct measurements and experiments are difficult due to the harsh operating environment.
This thesis developed a systematic, accurate, and computationally efficient approach based on DEM to model the flow behaviour of multi-component mixtures, and to apply the developed model to the blast furnace charging system, from the weighing bunkers to the top hopper.