2015 Volume 101 Issue 8 Pages 416-421
Shaft furnace (cupola) is a scrap melting furnace and it can reduce CO2 emission because it requires no reducing agents. In a shaft furnace, coke gasification reactions by CO2 and H2O are occurred in high temperature and they have great effects on coke rate in shaft furnace because they are strong endothermic reactions. So prediction of shaft furnace operation needs accurate gasification rates. In this study, first, gasification rates by CO2/N2 and H2O/N2 system were measured at 1573, 1673, 1773 and 1873 K. Diffusion coefficients in gasification rates were modified to fit experimental results. Next, one-dimensional mathematical model using modified gasification rates was developed for shaft furnace simulation. The effects of coke size and blast moisture on coke rate were calculated and compared with actual operations. Operational results were accurately predicted by the model.