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Inhibition to coke deterioration by benzene pyrolysis using response surface methodology

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Abstract

To solve the energy-saving and emission-reduction problem which caused by the deterioration of the thermal properties of coke in blast furnace and to improve the technologies applied to the inhibition to coke deterioration, benzene pyrolysis carbons were used to infiltrate into coke to inhibit coke deterioration for improving the thermal properties of coke. Taking aim at the coke reaction index (CRI) and the coke strength after reaction (CSR), the optimum infiltration conditions of benzene pyrolysis were researched by chemical vapor infiltration using response surface methodology. The models of regression of the thermal properties of coke with the experimental factors were established. Results indicated that the data were adequately fitted into quadratic models. The pyrolysis reaction time was found to have very significant linear effect on CRI and CSR. The pyrolysis reaction temperature, pyrolysis reaction time, flow rate of carrier gas and benzene temperature were found to have very significant quadratic effect on CRI and CSR, respectively. The interactions between some factors had significant effects on CRI and CSR. The experimental conditions range and optimum conditions were derived from three-dimensional response surface, contour plots and the model equations. Optimum results showed that the value of CRI decreased by about 11.94 wt % and the value of CSR increased by about 9.20 wt % under the optimum conditions. The SEM photos of cokes revealed that the pores of infiltrated coke were filled with pyrolysis carbon particles, which greatly reduced the reaction contact area for CO2 to erode coke. The changes of pore structure illustrated that the pores volume and the specific surface area of the infiltrated coke smaller than that of original coke. So infiltration of benzene pyrolysis can notably improve the thermal properties of coke.

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Authors and Affiliations

  1. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, 450001, China

    Zezhi Zhang, Zhenxi Jiang, Liucheng Wang & Fu-an Wang

  2. Department of Chemistry, Henan Institute of Education, Zhengzhou, 450046, China

    Zezhi Zhang & Chengwei Li

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  1. Zezhi Zhang
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  2. Zhenxi Jiang
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  3. Liucheng Wang
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  4. Chengwei Li
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  5. Fu-an Wang
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Correspondence to Zezhi Zhang.

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Zhang, Z., Jiang, Z., Wang, L. et al. Inhibition to coke deterioration by benzene pyrolysis using response surface methodology. Coke Chem. 55, 222–230 (2012). https://doi.org/10.3103/S1068364X12060105

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