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DEM study on ternary-sized particle segregation during the sinter burden charging process

Xu, Yang, Xu, Jian, Liao, Zhehan, Pei, Yuandong, Gao, Leizhang, Sun, Chengfeng, Kou, Mingyin, Wen, Liangyin
Powder technology 2019 v.343 pp. 422-435
carbon, energy use and consumption, friction, models, particle size, particle size distribution, permeability, powders, product quality, China
Particle size distribution has a great impact on the permeability of burden packed bed in the sintering process, which affects fuel consumption, carbon emission and product quality in industrial production. This study establishes a 1:1 scale DEM model of #2 sinter burden charging system in the Shougang, China. Based on the ternary-sized diagram, two innovative indices, namely segregation degree (SD) and segregation tendency (ST), are proposed to quantitatively evaluate particle size segregation during the charging process. The small-sized particles have lower horizontal velocities on the nine-roller charger than the large ones, therefore they play a major role in the inner granular flow and give priority to forming the upper layer of the packed bed. Compared with the nine-roller's speed, the particle-roller's wall friction coefficient has a greater impact on size segregation, and the large-sized particles show a more significant accumulation at the bottom with the increasing friction coefficient. In addition, the medium-sized particles distribution, especially in the middle part of the packed bed, is not obviously affected.