Abstract
ABSTRACTIn top gas recycling-oxygen blast furnace (TGR-BF) and injection coke oven gas-blast furnace (COG-BF), lower coke ratio highlight the importance of coke in the melting and dropping zone. To understand the deterioration of coke in lower blast furnace, the dynamic dissolution of CO2/H2O-gasified coke by slag containing FeO and reaction kinetics were analysed. The results showed that the coke deterioration was more serious in CO2 than in H2O for the same gasification ratio. To understand the internal variation of coke, pore distribution and microstructure of coke were observed using mercury porosimeter and scanning electron microscope (SEM). For the same gasification ratio, pore structure was more uniform in H2O than in CO2. In addition, the kinetics of coke's reaction with FeO in slag was analysed.
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