Behavior of Alkali Metals in Lump Zone Coke Under Hydrogen-Rich Blast Furnace Conditions Based on Liquid Nitrogen-Quenching and Dissection
摘要
The behavior of alkali metals in coke ash under a hydrogen-rich atmosphere was systematically investigated in this study. Coke samples obtained from the lump zone of a dissected hydrogen-rich blast furnace were analyzed to determine the forms, concentrations, and distributions of alkali metals. The effects of hydrogen injection rates, temperature, and pressure on alkali metal reactions were examined through thermodynamic analysis. It was found that water vapor in hydrogen-enriched gas reacts with alkali metals, facilitating the formation and accumulation of nepheline phases in coke. Thermodynamic simulations revealed that a 10% hydrogen content, combined with pressurization, effectively suppresses alkali metal enrichment in hydrogen-rich blast furnaces. These findings provide critical insights into the optimization of hydrogen utilization in blast furnace operations for controlling alkali metal behavior.