Effects of Coke Reactivity and Reaction Temperature on Coke Gasification Behavior in the Blast Furnace

Abstract

Coke degradation has a great influence on the blast furnace operation. Coke gasification behavior with CO₂ gas was investigated by coke gasification experiments and the mathematical model calculation. Cylindrically shaped coke was exposed to the CO/CO₂/N₂ atmosphere, at the temperature of 1473K or 1773K, then it was filed layer by layer to measure the gasification behavior. Coke gasification occurred preferentially at the surface of the coke with higher temperature or higher coke reactivity. Mathematical model of coke gasification clarified that the specific surface area of fine pores and the temperature had a great influence on the coke gasification behavior, which was expressed as α, the gasification ratio gradient inside the coke lump.