アルミナを擬似鉱石とした賦存状態の異なるコークスの充填層内燃焼速度

抄録

The combustion rate of coke in the course of iron are sintering is one of the important factors which govern the temperature pattern in the sintering bed and resulting properties of the produced sinter in the blast furnace. It has been pointed out by Hida et al. that there are some kinds of existing states of coke in the sinter raw mixture, such as S, C and P types, and the existing states remarkably influenced the rate of coke combustion.
In this study, some quasi-granules, which were modeled S and P types, were prepared by using coke and alumina particles. The effects of melt formation and reduction and reoxidation of iron oxide, which occurred at the shell layer of the granules, on the coke combustion can be neglected. The combustion rates of coke in the bed packed with dense alumina spheres were measured by a sintering simulator system. On the other hand, a mathematical model for these coke combustions was developed by the application of the unreacted-core model. The calculated results of the combustion rates were compared with measured ones, in order to derive the combustion equations of the coke. The computed results and measured data, such as combustion rates and bed-temperatures, agreed fairly well at various preheating temperatures.