A Kinetic Model of Coke Combustion in the Tuyere Zone of Blast Furnace

Abstract

A mathematical model is developed to describe the behaviours of coke combustion in the tuyere zone of blast furnace. The model is based on the reaction kinetics, the differential balances of heat and mass, and the mechanics of gas flows.
Regarding the axial distribution of gas composition in the tuyere zone, good agreement is obtained between the model prediction and the data observed in a working furnace by the other investigators. Calculated results show that the maximum consumption of coke occurs at the intermediate region of the raceway.
At the blowing of oxygen-enriched or high-humidity blast, the position at which the maximum consumption of coke occurs is shifted toward tuyere nose. Similar effect is accompanied with the decrease in particle diameter of coke in the tuyere zone.