Application of Simulation Model for Burden Distribution to Actual Operations

A simulation model for the burden distribution at blast furnace top was used for the quantitative evaluation of the effects of various charging conditions on the burden distribution and was applied to the actual operations at Kokura #2BF in cases of the control of hot spot occurrence at lower shaft and the control of furnace wall 'activeness'. Among three charging conditions, that is, coke base, charged O/C, and stock level, coke base has the most significant effect on the burden distribution. The decrease in charged O/C at furnace center was accelerated by the mixed layer formation during ore dumping in cases of the increase in coke base and charged O/C. On the other hand, the rise of stock level resulted in the increase in charged O/C at furnace center, which differs from the previous knowledge. For the restraint of hot spot occurrence, both suitable selection of movable armor notch based on the model computation and the mortar injection are important. To enhance wall 'activeness' the movable armor operation was successfully performed on the basis of the model computation. Through these applications of the model to actual operations, the effectiveness and the usefulness of the model was confirmed.