No.34 Influence of Gasification Regent on Coke-matrix Structure and Powdering Behavior

Abstract

Coke breakage or powdering behavior during gasification is very important parameter because size of coke particles influences the gas and molten iron permeability in a blast furnace. Crystalline carbon structure, pore structure of the coke-matrix, and especially type of gasification regent influence the powdering behavior. Comparing influence of CO_2 and H_2O gasification regent, the gasified and brittle coke-matrix layer is expected to be thinner in H_2O regent for the same reaction fraction. Since the reducing gas for iron ore is expected to be H_2 rich gas in COURSE50 project, in this study, the influence of gasification regent (CO_2, H_2O and CO_2/H_2O) on gasification kinetics of coke was investigated by analyzing the cross-sectional images of coke after reaction. Results from this study showed that the influence of the gasification regents on gasification kinetics was small.