A Mathematical Model of Blast Furnace Considering Uneven Distribution of Burdens and Gas

Abstract

In order to clarify the effects of radial distribution patterns of the burdens on the are reduction, heat transfer between gas and solids, and other operational results, a mathematical model taking account of an uneven radial distribution is presented.
The blast furnace is divided annularly into center, intermediate and peripheral zones, to all of which the mathematical model presented before can be applied by assuming the plug flow and uniform distribution of gas as well as of burdens. The distribution of gas flow rate to the three zones is regarded to be so determined as that gas pressure is equal everywhere in any horizontal section of the furnace under the radially different gas permeability due to radial distribution of ore/coke ratio. The calculation is carried out so as to make the mean of coke temperatures at the tuyere level equal to a predetermined value under a given o/c distribution.
The results of the calculation show that the increase of CO-utilization by about 1.8% and the saving of coke consumption by about 10kg/t-metal may be expected under the condition of uniform distribution in comparison with the distribution pattern in the 22th campaign of the experimental blast furnace.