Highly reactive coke made from low-rank coal: Relationship between the behavior of CO₂ + H₂O gasification reactions and multilevel structure

Abstract

Hydrogen-rich blast furnaces require the use of highly reactive coke due to their lower furnace temperature. In addition, a hydrogen-rich blast furnace contains a large amount of water vapor. We investigated the reaction behavior of highly reactive briquetting coke prepared from low-rank coal as the main raw material under a CO₂ + H₂O atmosphere. The reaction behavior and postreaction compressive strength of coke at different H₂O contents were examined. The changes in microcrystalline structure, functional groups, apparent porosity, micron pore structure, nitrogen and carbon dioxide adsorption properties of coke before reaction and after gasification reaction at different H₂O contents were investigated. Compared with traditional coke, briquetting coke not only has high reactivity at different H₂O contents but also high compressive strength after reaction. The reaction of briquetting coke under a CO₂ + H₂O atmosphere was significantly controlled by surface reactions.