Non-isothermal reaction kinetics of metallized burden in 50%CO2+50%CO gas mixture
YAN Rui-jun1,2,3, CHU Man-sheng1,2,3, LIU Zheng-gen1,2,3, LIU Pei-jun1,2,3
1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 2. Institute for Frontier Technologies of Low-carbon Steelmaking, Northeastern University, Shenyang 110819, Liaoning, China; 3. Liaoning Low-carbon Steelmaking Technology Engineering Research Center, Shenyang 110819, Liaoning, China
Abstract：As a new low-carbon ironmaking technology, the use of metallized burden in blast furnace offers new possibilities for deep cuts in CO2 emissions. Due to the easy re-oxidation of the metallized burden, the question of whether the metallized burden loaded into the top of blast furnace can be re-oxidized by CO2 in the top gas has become a concern. The non-isothermal reaction kinetics of metallized burden with metallization ratio of 70% in 50%CO2+50%CO gas mixture was studied. KAS method was used to calculate the apparent activation energy and reaction mechanism, and the reaction characteristic temperature was analyzed. The results show that the non-isothermal reaction process of metallized burden with metallization ratio of 70% exhibits a single step reaction behavior in 50%CO2+50%CO gas mixture. The optimal reaction mechanism model is A1 model controlled by chemical reaction. The reaction of metallized burden at low temperature needs to overcome large reaction energy barrier. The apparent activation energy of main reaction stages is 114.22 kJ/mol, and the pre-exponential factor is 2 785/s. The reaction process exhibits hysteretic phenomenon with increasing of heating rate. As the heating rate increases from 5 K/min to 20 K/min, the reaction starting temperature increases from 1 045 K to 1 140 K, and the rapid reaction temperature increases from 1 267 K to 1 470 K. However, actual top temperature of blast furnace is far lower than 1 045 K. Therefore, the metallized burden will not be re-oxidized by CO2 in the gas at the top of blast furnace.
闫瑞军, 储满生, 柳政根, 刘培军. 50%CO2+50%CO气氛下金属化炉料非等温反应动力学[J]. 中国冶金, 2023, 33(4): 33-40.
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2023, Vol. 33 
