Change of burden layer reduction process after injecting CO2 into the tuyere of a blast furnace

Abstract

In order to expand the utilisation of CO2 as a resource in the metallurgical industry, it is proposed to inject CO2 into the tuyere of blast furnace. CO2 reacts completely at the tuyere raceway zone, increasing the CO concentration of the gas, affects the reduction process. Therefore, the influence of injecting CO2 into the tuyere on the reduction process of the burden layer is analysed through a series of experiments. The results indicate that when the CO2 injection rate increases to 4%, the improvement of the permeability is most significant, which is due to the increase of the metal phase dispersion in the burden layer. The influence of injecting CO2 on the burden layer distribution mainly comes from the influence of the experimental atmosphere on the reduction degree. With the increase of the CO2 injection rate, the low temperature reduction pulverisation behavior of burden layer changes less.