Advancing carbon-neutral iron production: Non-equimolar diffusion kinetics of coke with HO in hydrogen-rich blast furnaces.

This study presents a non-equimolar diffusion model to enhance the predictive accuracy of coke degradation kinetics in hydrogen-rich blast furnaces, where elevated water vapor (HO) levels are present. The model integrates the unreacted core shrink model with the Maxwell-Stefan equation to delineate the 3D curved surface distribution of HO concentration and the effective diffusion coefficient within the coke ash layer. Validated against experimental data, the model demonstrated a significant improvement in accuracy, with a deviation range of 0.