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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文章导航 > 矿物冶金与材料学报（英文） > 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

Cite this article as:

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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研究论文

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

School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243000, China
The third ironworks, Ma'anshan Iron & Steel Co., Ltd, Ma'anshan 243000, China

通讯作者:
Ping Wang E-mail: wangping63629@163.com

Zheng-jian Liu E-mail: liuzhengjian@126.com

中文摘要

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.

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Research Article

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

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

中文摘要

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

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