In the paper,the reduction behavior of pellets under different reducing gas components(H2 volume fraction content 0%,10%,20%,30%,40%)under simulated blast furnace heating system was studied.The kinetics of hydrogen-rich reduction of pellets and the macroscopic structure changes of pellets during the reaction were analyzed by using the unreacted core model.The results show that with the increase of hydrogen content in the reducing gas,the final reduction degree of pel-lets increased from 52.45%to 84.09%,and the reduction starting temperature under full hydrogen condition was 63 ℃ higher than that under full CO condition.In addition,the kinetic analysis showed that the reaction was first controlled by the chemical reaction,and then gradually controlled by the mix-ture of chemical reaction and internal diffusion.The structural analysis of the pellet control step transi-tion showed that the penetration rate increases from 2.3%to 42.3%with the increase of hydrogen con-tent.This study can provide a certain degree of reference for the mechanism analysis of the hydrogen-rich reduction process of blast furnace and the optimal control of process parameters.
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