7TH EUROPEAN COKE AND IRONMAKING CONGRESS - ECIC 2016

Utilization of small coke (nut coke) in the blast furnace was carried out to improve the permeability in the lower part of the blast furnace. However, at high small coke rates, it was thought that some small coke continues to exist in the lower part of the blast furnace because the small coke charging rate is larger than the gasification reaction rate of the small coke in the blast furnace. Therefore, the reaction behavior of the small coke in the blast furnace was investigated by a mathematical model of the blast furnace. The gasification reaction rate of the small coke and the lump coke were respectively considered for the simulation, and the reaction behavior of each coke was calculated. At high small coke rate, some small coke with a reduced particle size continues to exist in the lower part of the blast furnace, and a coke packed bed mixed with the unconsumed small coke was formed in the lower part of the blast furnace. As a result, the increase in pressure drop in the lower part of the blast furnace was predicted by the decrease in average particle size and void fraction of the coke packed bed in the lower part of the blast furnace.