EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

The shaft furnace is a scrap melting furnace which produces high calorie gas and thus plays an important part as an energy supplier in a steel works. In shaft furnace operation, the coke rate is reduced or the exhaust gas calorie is increased corresponding to the energy balance in the steel works. Because the coke rate and exhaust gas calorie are determined by coke gasification reactivity, the reactivity control technique is very important. In this study, the coke surface was coated with CaCO3, Fe2O3 or SiO2 to control coke reactivity, and the gasification rates were measured at 1573-1773K. As results, the gasification rate was accelerated by CaCO3 and Fe2O3 and decelerated by SiO2. The acquired gasification rates were applied to a one-dimensional mathematical model of the shaft furnace. Shaft furnace operation with controlled coke reactivity was simulated, and the effects of coke reactivity on the coke rate and exhaust gas calorie were estimated.