Authors: I. Gordon, M. Blank, M. Prints, B. Bokovikov
1998 ICSTI Ironmaking Conference Proceedings - pp. 899-905
Abstract
The process for DRI/HBI production with natural gas self-reforming in the metallization zone of a shaft furnace is developed. This process utilizes counter-current flow for preheating, prereduction and cooling zones and co- current flow for metallization zone. The products of natural gas partial combustion are used as a process gas for reduction and preheating stages, and recycled hydrogen and natural gas mixture is used as a process gas for the metallization stage. Cycled process gas is also used as a coolant. The optimal design and operational parameters of the furnace have been determined based on mathematical model of the process. The large scale industrial plant tests have proved the possibility of DR1/HBI production with metallization level and carbon content up to 92-95% and 3-4% respectively. The heat consumption for this process is lower, by up to 5% per ton of metallized iron, in comparison with conventional reduction processes in shaft furnaces, and expensive catalystmaterialsare not required.
