NUMERICAL-ANALYSIS OF COMBUSTION MECHANISM IN IRON BATH TYPE SMELTING REDUCTION FURNACE

A numerical analysis based on the mathematical model has been made on the combustion phenomena in an iron bath type smelting reduction furnace. This model deals with seven components : C, CO, CO2, O2, H-2, H2O, N2. Gas flow, temperature distribution in smelting reduction furnace were calculated. The change of post combustion ratio by coal species and coal feed rate into smelting reduction furnace was calculated and compared with 5 t scale experiment. The model was also used to calculate material and heat balance when heat loss amount and prereduction degree of ore changed. It was found that the material and heat balance point was determined uniquely by coal species, heat loss amount, and prereduction degree of ore. In this balance point, ore and coal feed rates are determined uniquely, post combustion ratio and heat efficiency are also determined, so coal and oxygen consumption and productivity at this point can be calculated.