Modeling Carbon Composite Briquette Reaction Under H2-H2O-CO-CO2-N2 Atmosphere

Charge carbon composite briquetteCarbon Composite Briquette (CCB) is an effective method to reduce CO2 emissions and save energy in blast furnaceBlast furnace (BF) ironmakingIronmaking. Presently with the hydrogenHydrogen-bearing gas being injected in the BFBlast furnace, the content of H2 and H2O in the BF gas is comparable to those of CO and CO2, and they could not be ignored in analyzing the CCB reaction behaviorReaction behavior in the BF shaft. In this research, a mathematical modelModel was developed for analyzing the reaction behaviorReaction behavior of CCB under the H2-H2O-CO-CO2-N2 atmosphere. The model was one-dimensional. Chemical reactions, internal gas diffusion, and mass transfer between the CCBCarbon Composite Briquette and the atmosphere were considered in the model. Using the model, the influence of gas composition and temperature on CCB reaction was discussed and the reaction progress was investigated. The simulation results showed that increasing temperature or increasing hydrogenHydrogen in the atmosphere can prompt the reductionReduction of iron oxide and the gasification of carbon in CCB. In the investigated temperature range, iron oxide reduction by hydrogen and carbon gasification by water vapor played important roles in the CCBCarbon Composite Briquette reaction process.