Abstract：Aiming at the common central coke charging process，the three-dimensional mathematical models for burden particles comprehensive motion within rotating chute during the charging process was established，and then the model describing particles falling in the freeboard and the model for stock profile formed by particles accumulation and its radial distribution of ore to coke ratio were developed as well. Through comparing the predicted stock profile by established model and measured results in blow-in stage，the validity of the model was proved. Based on actual blast furnace parameters，the distribution of burden falling point and radial distribution of ore to coke ration were calculated under 13° central coke charging pattern and 20° central coke charging pattern respectively. The results show that as part of central coke distributed in intermediate zone during charging process，the actual coke quantity in the center decreased，and the effective central coke charging rates were 49.4% and 70.4%，respectively. And under the former charging mode，a connected central coke column zone with about 1.2 m diameter has been formed，while wide range of columnar zone with low distribution of ore to coke ratio with about 2.5 m diameter was formed under the latter condition. Finally，the principle of central coke charging was deeply clarified，several problems existing in current central coke charging pattern were pointed out，and efficient burden distribution patterns were discussed with important significance in guiding the actual blast furnace production.
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2016, Vol. 51 
