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Effect under the Low Concentration of CO2 and H2O(g) on the Coke Dissolution Loss Rate of Coke in CDQ

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Abstract

In order to investigate the carbon solution loss reaction in CDQ, this paper used thermo-gravimetric device to simulate the environment of a dry quenching furnace to investigate the effect of CO2, H2O (g) and CO2 + H2O (g) gas mixtures at low concentrations (<20%) on carbon solution loss of coke. The results showed that the reactivity of H2O (g) with coke was higher than that of CO2 at the same concentration, and that the reactivity of coke in the mixed atmosphere is lower than the sum of the independent reactivity of coke with CO2 and H2O (g) but higher than the reactivity of the corresponding single gas. The activation energy of the coke gasification reaction with H2O(g) was lower through calculating the kinetic parameters using the Coats-Redfern method, and the coke strength after reaction of nonisothermal (CSRnon) was lower than with CO2. The content of isotropic structure of coke decreased significantly after reaction with the increase of reaction CO2 and H2O (g) concentration, while the content of anisotropic structure increased. The surface of the coke was relatively smooth after reaction with CO2 by SEM, while that had increased in roughness and pore size after reaction with H2O (g), and it was severely eroded like a honeycomb after reaction with CO2 + H2O (g), which indicated that the coke pores were opened and expanded action under the erosion of CO2 + H2O (g), resulting in the thinning and even breaking of the pore walls and the formation of gas reaction channels.

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Funding

Financial support for this work by Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization, Anhui University of Technology (no. CHV19-02)

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Anhui University of Technology, 243002, Ma’anshan, Anhui, China

    Wenna Ma, Xue Wang, Xiaoyong Zhang & Dailin Zhang

  2. Meishan Iron and Steel Technology Center, Baosteel Research Institute Nanjing, 210039, Jiangsu, China

    Wencheng Zhang

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  1. Wenna Ma
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  2. Xue Wang
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  3. Xiaoyong Zhang
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  4. Dailin Zhang
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Correspondence to Wenna Ma, Xiaoyong Zhang or Wencheng Zhang.

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Wenna Ma, Wang, X., Zhang, X. et al. Effect under the Low Concentration of CO2 and H2O(g) on the Coke Dissolution Loss Rate of Coke in CDQ. Coke Chem. 66, 179–185 (2023). https://doi.org/10.3103/S1068364X23700576

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