2014 Alexander Babich Interaction between Co injected Substances with Pulverized Coal into the Blast Furnace isijinternational.54.2704

Co-injection of two or more reducing agents via tuyères is an innovative approach aimed at enhancing the technological, economic, and environmental performance of blast furnace operations. This study investigates the conversion behavior of pulverized coal in conjunction with various co-injected substances, focusing on the design features of tuyère assemblies. The research utilizes the Multifunctional Injection Rig for Ironmaking (MIRI) at the Department of Ferrous Metallurgy, RWTH Aachen University, conducting a series of experiments that simulate different conditions for the injection of coal, carbon monoxide, and oxygen. The conversion degree of the pulverized coal is assessed through three distinct methods, along with a microstructural analysis that examines the effects of pre-mixing with the aforementioned components on combustion behavior. Results indicate critical parameters influencing the conversion of coal particles, derived from the combustion mechanisms and constructional characteristics of the tuyère stock arrangement. This study provides valuable insights for optimizing lance arrangements in blast furnaces and suggests potential pathways for the implementation of more efficient reducing agents, ultimately aiming for a significant reduction in CO2 emissions during iron production.