Yiru Yang¹, Lei Guo¹, Qipeng Bao¹, Zhancheng Guo¹; ¹University of Science and Technology Beijing

The combined coal gasification and flash ironmaking process (CG-FI) was the latest industrial practice of the non-blast furnace ironmaking, and it can also be recognized as a polygeneration system for high-quality syngas and reduced iron. A computational fluid dynamics (CFD) model was established to explore the process conditions based on the pilot-scale equipment. The turbulent flow, gas-particle coupling, and reaction kinetic model were considered in the model, which was already validated in the prior researches. In this study, the different feed combinations, including Oxygen/Coal ratio (0.6-0.8) and Ore/Coal ratio (0.2-1.6), was investigated to illuminate the interrelationship during the gasification-reduction coupling process. The results demonstrated that the qualified reduced iron (Reduction Degree=52.47%) can be obtained even in the worst case (Oxygen/Coal ratio=0.6, Ore/Coal ratio=1.6). Moreover, the dispersed hematite particles replaced the role of H2O as the coolant and partial oxidant in the traditional coal gasification process to enhance the gasification performance.