Effects of Hydrogen-Rich Gas Composition on Energy Consumption and the Raceway State of Oxygen Blast Furnace

Oxygen blast furnace is an important transformation method for the low-carbon and green development of traditional blast furnaces. This paper establishes a multi-zone mass and heat balance model and computational fluid dynamics model to study the influence of different hydrogen-rich gas composition on the smelting parameters, raceway state and combustion behavior of oxygen blast furnaces. The results show that the higher gas injection temperature can increase its physical heat, thereby reducing the coke ratio and improving the gas utilization rate. Furthermore, the injection amount of CH₄ and H₂ increases, resulting in lower raceway temperature and the direct reduction degree in the furnace, which can still meet the smelting requirements at lower raceway temperatures in actual production. Meanwhile, due to the oxygen competition relationship between coal and hydrogen-rich gas, as the proportion of CH₄ and H₂ injection increases, the coal burnout rate decreases. This research provides a theoretical basis for the regulation of low-carbon and high-efficiency oxygen blast furnace gas injection components.