Effect of CO<sub>2</sub> and H<sub>2</sub>O on gasification dissolution and deep reaction of coke

Zhi-yu Chang; Ping Wang; Jian-liang Zhang; Ke-xin Jiao; Yue-qiang Zhang; Zheng-jian Liu

doi:10.1007/s12613-018-1694-4

Volume 25 Issue 12

Dec. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(12): 1402-1411

Zhi-yu Chang, Ping Wang, Jian-liang Zhang, Ke-xin Jiao, Yue-qiang Zhang, and Zheng-jian Liu, Effect of CO₂ and H₂O on gasification dissolution and deep reaction of coke, Int. J. Miner. Metall. Mater., 25(2018), No. 12, pp. 1402-1411. https://doi.org/10.1007/s12613-018-1694-4

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Zhi-yu Chang, Ping Wang, Jian-liang Zhang, Ke-xin Jiao, Yue-qiang Zhang, and Zheng-jian Liu, Effect of CO2 and H2O on gasification dissolution and deep reaction of coke, Int. J. Miner. Metall. Mater., 25(2018), No. 12, pp. 1402-1411. https://doi.org/10.1007/s12613-018-1694-4

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Research Article

Effect of CO₂ and H₂O on gasification dissolution and deep reaction of coke

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Corresponding authors:
Ping Wang E-mail: wangping63629@163.com

Zheng-jian Liu E-mail: liuzhengjian@126.com
Received: 31 March 2018; Revised: 13 May 2018; Accepted: 13 July 2018

Abstract

Abstract

To more comprehensively analyze the effect of CO₂ and H₂O on the gasification dissolution reaction and deep reaction of coke, the reactions of coke with CO₂ and H₂O using high temperature gas-solid reaction apparatus over the range of 950-1250℃ were studied, and the thermodynamic and kinetic analyses were also performed. The results show that the average reaction rate of coke with H₂O is about 1.3-6.5 times that with CO₂ in the experimental temperature range. At the same temperature, the endothermic effect of coke with H₂O is less than that with CO₂. As the pressure increases, the gasification dissolution reaction of coke shifts to the high-temperature zone. The use of hydrogen-rich fuels is conducive to decreasing the energy consumed inside the blast furnace, and a corresponding high-pressure operation will help to suppress the gasification dissolution reaction of coke and reduce its deterioration. The interfacial chemical reaction is the main rate-limiting step over the experimental temperature range. The activation energies of the reaction of coke with CO₂ and H₂O are 169.23 kJ·mol^-1 and 87.13 kJ·mol^-1, respectively. Additionally, water vapor is more likely to diffuse into the coke interior at a lower temperature and thus aggravates the deterioration of coke in the middle upper part of blast furnace.
- coke;
- gasification dissolution reaction;
- deep reaction;
- rate-limiting step;
- activation energy

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