Ko-ichiro Ohno

Abstract:

Numerical simulation of temperature distribution in the iron ore sintering process is one of the most important techniques to maintain a high quality of iron ore sinter. A correct comprehension of coke combustion rate is necessary for estimation of temperature distribution in this process. However an ordinal equation, "Hottel's equation", for estimation of coke combustion rate cannot correctly describe the combustion behavior of fine coke in quasi-particle because it is normally applied for single particle coke combustion behavior. The purpose of this study is to correctly estimate temperature distribution in the iron ore sintering process using numerical simulation model based on coke combustion rate in the fine layer of the quasi-particle. The following results were obtained. The higher mixing ratio of fine coke made the larger effective diffusion coefficient of oxygen because the higher mixing ratio of coke made the higher void ratio in the sample after coke combustion. More practical temperature distribution could be calculated considering the coke combustion rate in quasi-particle instead of using only "Hottel's equation". A decrease in the temperature distribution in the sintering layer was found in consideration of the liquid phase formation effect on coke combustion rate. This effect will increase by increasing the fine coke amount in the process.