Effect of the coke particle size distribution on the burden layer porosity of blast furnace

The effect of the coke particle size distribution on the burden layer porosity of blast furnace were analyzed by DEM simulation in this study, and the uneven index proposed to achieve quantitative evaluation of the coke particle size distribution. The calculation results show that with the increase of uneven index of coke particle size distribution, 1) the total discharging time of coke discharged from hopper to throat process from 170 s decrease to 163 s. 2) the SI index of small particle is rising gradually but the SI index of large particle decreases gradually in the central region of the throat. 3) The thickness of burden layer decreases. 4) The porosity of burden layer from 37% decreases to 34%. Through the research in this study, combined with online coke and sintered ore particle size distribution detection system, which can adjust the flow rate of flow control gate and charging program in advance when the particle size distribution of coke and sintered ore fluctuates.