Effects of Atmospheric Gas Composition and Temperature on the Gasification of Coal in Hot Briatietting Carbon Composite Iron Ore

The gasification behavior of carbon composite iron ore produced by hot briquetting process was examined under various gas atmospheres such as CO-N2, CO2-N2 and CO-CO2 at various temperatures. The gasification of coal was affected strongly by atmospheric gas concentration and reaction temperature. Kinetic analysis in various gas atmospheres was carried out by using the first order reaction model, which yields the straight line relation between reaction rate constants for the gasification of coal and the gas concentration. Therefore, reaction rate constants for the gasification of coal in CO-0O2-N2 gas atmosphere were written as follows; Icc, =a X Icc,(C0)+b xkc.,(CO2)+c X kci(N2) lcc2= a X Icc2(C0)+ b X kc2(CO2)+ c X Icc2(N2) a=Ccol(Cco+Cco,+C,), b= Ccol(Cco+ Cco+/- CO, c= CNI(Cco+ Cc0,+ Cm) where, /cc, and Icc2 are the gasification rate constant of the first half (1/s) and the latter half (1/s) respectively, kc1(C0), kci(CO2) and ko(N2) are kc, in 100% CO gas atmosphere (1/s), 100% CO2 gas atmosphere (1/s) and 100% N2 gas atmosphere (1/s) respectively, kc2(C0), kc2(CO2) and Icc2(N2) are Ica in 100% CO gas atmosphere (1/s), 100% CO2 gas atmosphere (1/s) and 100% N2 gas atmosphere (1/s) respectively, Cco, Ccc, and CN, are the concentration of CO gas (vol%), CO2 gas (vol%) and N2 gas (vol%) respectively.