LAUSR

Abstract In this study, the flash reduction process of hematite particles with six hydrogen-rich gases of purified COREX (PCOREX), dry pulverized coal gasification (DPCG), water-coal slurry gasification (WCSG), Midrex, HYL-III, and reformed coke oven gas (RCOG) was investigated. The homogeneous and heterogeneous reactions occurring in the reduction temperature range were determined by thermodynamic analysis. On this basis, a three-dimensional computational fluid dynamics model was established to demonstrate the flash reduction process in a drop tube furnace and describe hematite particle characteristics during the in-flight reduction process. Results showed that a higher hydrogen content led to a faster reduction rate and a higher reduction degree. Hence, the reduction degree increased according to the following trend of PCOREX 90%.