Simulation of gas flow distribution in blast furnace under different column modes
XU Ying-jie1, SHE Xue-feng1, LI Hong-bing2, CAO Wei-qiang2, ZHANG Ji-bin2, XUE Qing-guo1
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2. Ironmaking Plant,Yuhua Steel Limited, Handan 056000, Hebei, China
Abstract:High-alumina charges are widely used in blast furnace smelting, and the slag composition needs to be controlled to satisfy the demand of ironmaking during the smelting process, which leads to increase in slag ratio and change in the location of the cohesive zone, and in turn affects the gas distribution in the blast furnace. Therefore, based on the Flunt numerical simulation method, the gas distribution in the blast furnace under different column modes was studied. The results show that the different column modes mainly affect gas distribution near the cohesive zone, and have less impact on gas distribution in the upper part of furnace shaft. With the increase of height and thickness of inverted V-shaped cohesive zone, the average gas velocity of 11.1 m to 13.0 m in the center of blast furnace is weakened from 0.76 m/s to 0.69 m/s, while the average gas velocity of 8.6 m to 11.1 m at the edge is increased by 0.05 m/s. The gas velocity in the lower part of cohesive zone under column modes of the W-shaped cohesive zone is higher than that under the charge column mode of the inverted V-shaped cohesive zone. The results can provide theoretical basis for guiding the smelting with large quantity of slag in blast furnace.
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