Model study of the effect of particles structure on the heat and mass transfer through the packed bed in ironmaking blast furnace

• Published in: International journal of heat and mass transfer Vol. 91; pp. 1176 - 1186
• Main Authors: Natsui, Shungo, Takai, Hifumi, Nashimoto, Ryota, Kikuchi, Tatsuya, Suzuki, Ryosuke O.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2015
• Subjects: Decreased coke ratio; DEM–CFD simulation; Ironmaking blast furnace; Packed bed; Pressure drop; Reduction rate; Packed bed; Decreased coke ratio; Pressure drop; DEM–CFD simulation; Reduction rate; Ironmaking blast furnace
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2015.08.033

•DEM–CFD simulation was carried out to analyze the heat and mass transfer in a blast furnace.•Recently proposed helical structure was compared with the layer-by-layer structure.•The helical structure becomes more permeable even under the decreased coke ratio condition.•For the helical structure, the reduction rate of ore tends to be lower than that for layered structure. Ironmaking technology is currently focused on the introduction of the decreased reducing agent operation of a blast furnace in order to decrease CO2 emissions. Because the coke ratio is reduced in this operation, causing a huge pressure drop, it has become increasingly important to understand the in-furnace phenomena using the non-empirical method. In this study, the DEM–CFD simulation was carried out to analyze the heat and mass transfer between the gaseous phase and the particles in a packed bed. In particular, the effect of recently proposed helical structure of coke and ore layers was compared with the traditional layer-by-layer structure. This comparison shows that the helical structure is effective for the smooth gas flow in the packed bed. It was found that the increase of the gas flow rate in a large grain size coke layer, would not affect the total permeability of the packed bed. Since the helical structure decreases the amount of inflow of the gaseous phase to the ore bed, the reduction rate of this ore tends to decrease the thickness of the layered structure, but this effect is relatively small. The helical structure becomes more permeable, if a thicker layer is maintained even under the decreased coke ratio condition.