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• W4367278864 abstract "There is a precise theoretical correspondence between the microscopic chemistry and physical structure of coke and its apparent rate constant k rea and pore diffusion coefficient D eff of carbon loss process, and a certain precise mathematical relationship between k rea / D eff and the degradation gradient or degradation behavior of coke in blast furnace should exist. This is the key basis for predicting and evaluating coke degradation behavior in blast furnace through coke microstructure. In this work, the evolution relationship between the chemical and physical structure of coke and the macroscopic kinetic parameters k rea , D eff was studied by gasification experiment of coke with different particle sizes. The results show that with the deepening of coke solution loss, minerals gradually precipitate on the surface of coke, and play a catalytic role in the process of solution loss, resulting in a decrease in activation energy and an increase in k rea . At this point, the micropores in coke expand and merge into mesopores and macropores, the diffusion path of CO 2 molecule decreases, the diffusion activation energy decreases, and D eff increases gradually. In the middle and late period of solution loss, the active components in coke are consumed and the ash in coke is precipitated, which increases the activation energy and decreases the k rea . Moreover, the number of macropores in coke is further increased, and the tortuous degree of porous structure is greatly reduced, which leads to the decrease of diffusion activation energy and the increase of D eff . k rea / D eff represents the gradient reaction ability of coke on the macro level. The higher the k rea / D eff value, the greater the reaction gradient of coke under the same conditions, which further affects the degradation gradient and degradation behavior of coke in the blast furnace." @default.
• W4367278864 created "2023-04-29" @default.
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• W4367278864 date "2023-01-01" @default.
• W4367278864 modified "2023-10-16" @default.
• W4367278864 title "Multi-scale relationship between coke gasification kinetics and its microstructure evolution in the blast furnace" @default.
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• W4367278864 doi "https://doi.org/10.1051/metal/2023024" @default.
• W4367278864 hasPublicationYear "2023" @default.
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