2007 Volume 93 Issue 1 Pages 18-22
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-CO2-N2 gas atmosphere were written as follows;
kC1=a×kC1(CO)+b×kC1(CO2)+c×kC1(N2)
kC2=a×kC2(CO)+b×kC2(CO2)+c×kC2(N2)
a=CCO/(CCO+CCO2+CN2), b=CCO2/(CCO+CCO2+CN2), c=CN2/(CCO+CCO2+CN2)
where, kC1 and kC2 are the gasification rate constant of the first half (1/s) and the latter half (1/s) respectively, kC1(CO), kC1(CO2) and kC1(N2) are kC1 in 100% CO gas atmosphere (1/s), 100% CO2 gas atmosphere (1/s) and 100% N2 gas atmosphere (1/s) respectively, kC2(CO), kC2(CO2) and kC2(N2) are kC2 in 100% CO gas atmosphere (1/s), 100% CO2 gas atmosphere (1/s) and 100% N2 gas atmosphere (1/s) respectively, CCO, CCO2 and CN2 are the concentration of CO gas (vol%), CO2 gas (vol%) and N2 gas (vol%) respectively.
