Shaft Furnace Simulation by Mathematical Model Considering Coke Gasification Rate in High Temperature

摘要

Shaft furnace (cupola) is a scrap melting furnace and it can reduce CO_2 emission because it requires no reducing agents. In a shaft furnace, coke gasification reactions by CO_2 and H_2O 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 CO_2/N_2 and H_2O/N_2 system were measured at 1 573, 1 673, 1 773 and 1 873 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.