Estimation of the Inner States by the Use of the Model to Evaluate the Influence of Sinter and Coke Properties at Blast Furnace

The effects of sinter qualities and coke qualities on the condition inside of the blast furnace are theoretically investigated by the two-dimensional mathematical model of blast furnace which was coupled with the degradation model of sinter and coke.The following results are obtained ;(1) Effect of sinter quality.1) The pressure drop in the blast furnace increases with the increase of RDI or the decrease of the particle diameter of charged sinter.2) The increase in RDI increases ore to coke ratio (O/C) and also gas utilization ratio because it increases the reduction rate of sinter. As the result, gas and solid temperature in the upper part of the blast furnace decreases.(2) Effect of coke quality.1) Coke degradation rate below the solution loss zone in the blast furnace decreases with the increase of CSR.2) The decrease of the solution loss reaction causes the increases of the gas utilization ratio and gas and solid temperature in the blast furnace.The simulated results agreed with the observed results of an actual blast furnace.