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Effect of Carbon Loss Reaction Kinetics on Coke Degradation by Piecewise Analysis

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Metallurgical and Materials Transactions B Aims and scope Submit manuscript

Abstract

During carbon loss reaction, different reaction gradients would be generated inside the porous structure of coke, which had an important impact on the degradation behavior of coke. The diffusion coefficient Deff of gas in coke pore will change with the random evolution of coke pore structure, which brings great difficulties to accurately analyze the concentration field or reaction gradient of carbon loss reaction by simulation method. To solve this problem, this work proposes to measure the relationship between coke pore structure and diffusion coefficient at different reaction stages by means of piecewise analysis. Furthermore, it is proposed that the size of the carbon loss reaction gradient in coke pores depends on the relative size of the chemical reaction rate and the mass transfer rate, and the parameter krea/Deff characterizing the gradient degradation properties of coke was given. Alkali metal catalysis has a significant kinetic effect on the carbon loss process of coke, that is, it can significantly increase the krea/Deff value of coke, resulting in a larger degradation gradient of coke in the blast furnace. This will make the particle size distribution of degraded coke more uneven, thus significantly reducing the permeability of the blast furnace. The process of coke degradation is similar to pencil sharpening, and the breaking strength and fines generation behavior of cokes depend on how sharp they are sharpened (degradation gradient). The degradation gradient is related to the instantaneous gradient which is determined by krea/Deff and speed of sharpening pencils. Thus, the piecewise analysis method used in this work could supply an effective reference for further constructing the mathematical relationship between coke microstructure and its degradation behavior in blast furnace.

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Acknowledgments

The authors would like to express their thanks for the support to this work by Natural Science Foundation of Shaanxi Province (2019JLM-34).

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, Shaanxi, P.R. China

    Qihang Liu, Di Wang, Xiaowei Zhao & Shuangping Yang

  2. Metallurgical Engineering Technology Research Center of Shaanxi Province, Xi’an, 710055, Shaanxi, P.R. China

    Qihang Liu, Di Wang, Xiaowei Zhao & Shuangping Yang

  3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Keng Wu

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  1. Qihang Liu
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  2. Di Wang
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Correspondence to Qihang Liu.

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Liu, Q., Wang, D., Zhao, X. et al. Effect of Carbon Loss Reaction Kinetics on Coke Degradation by Piecewise Analysis. Metall Mater Trans B 54, 2519–2529 (2023). https://doi.org/10.1007/s11663-023-02852-y

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  • DOI: https://doi.org/10.1007/s11663-023-02852-y

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