8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

Pulverized coal injection is a commonly used practice in modern blast furnace operation. To further increase the PCI rate, a detailed understanding of gasification kinetics behavior of injected coal in tuyere and characteristics of combustion residues is critical. Using the PCI injection simulation rig at CanmetENERGY, the combustion behavior of selected typical PCI coals was examined. The combustion residues collected were analyzed to quantify the contribution of different types of carbon, namely char, coke and soot, using a TGA technique developed recently at CanmetENERGY. Using the information collected, the transformation of coal into different type of carbon materials during heating and combustion is determined. The collected information enables a direct comparison between coals and allows to optimize combustion conditions to further increase PCI rate.