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

Author:
Xu, Yang, Xu, Jian, Liao, Zhehan, Pei, Yuandong, Gao, Leizhang, Sun, Chengfeng, Kou, Mingyin, Wen, Liangyin
Source:
Powder technology 2019 v.343 pp. 422-435
ISSN:
0032-5910
Subject:
carbon, energy use and consumption, friction, models, particle size, particle size distribution, permeability, powders, product quality, China
Abstract:
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.
Agid:
6231837