Combustion performance of pulverized coal and corresponding kinetics study after adding the additives of Fe<sub>2</sub>O<sub>3</sub> and CaO

Qiangjian Gao; Guopeng Zhang; Haiyan Zheng; Xin Jiang; Fengman Shen

doi:10.1007/s12613-022-2432-5

Volume 30 Issue 2

Feb. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(2): 314-323

Qiangjian Gao, Guopeng Zhang, Haiyan Zheng, Xin Jiang, and Fengman Shen, Combustion performance of pulverized coal and corresponding kinetics study after adding the additives of Fe₂O₃ and CaO, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 314-323. https://doi.org/10.1007/s12613-022-2432-5

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Qiangjian Gao, Guopeng Zhang, Haiyan Zheng, Xin Jiang, and Fengman Shen, Combustion performance of pulverized coal and corresponding kinetics study after adding the additives of Fe2O3 and CaO, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 314-323. https://doi.org/10.1007/s12613-022-2432-5

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Research Article

Combustion performance of pulverized coal and corresponding kinetics study after adding the additives of Fe₂O₃ and CaO

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Corresponding author:
Qiangjian Gao E-mail: gaoqiangjian@163.com
Received: 23 November 2021; Revised: 26 January 2022; Accepted: 29 January 2022; Available online: 30 January 2022

Abstract

Abstract

Combustion performance of pulverized coal (PC) in blast furnace (BF) process is regarded as a criteria parameter to assess the proper injection dosage of PC. In this paper, effects of two kinds of additives, Fe₂O₃ and CaO, on PC combustion were studied using the thermo-gravimetric method. The results demonstrate that both the Fe₂O₃ and CaO can promote combustion performance index of PC including ignition index (C_i), burnout index (D_b), as well as comprehensive combustibility index (S_n). The S_n increases from 1.37 × 10⁻⁶ to 2.16 × 10⁻⁶ %²·min⁻²·°C⁻³ as the Fe₂O₃ proportion increases from 0 to 5.0wt%. Additionally, the combustion kinetics of PC was clarified using the Coats-Redfern method. The results show that the activation energy (E) of PC combustion decreases after adding the above additives. For instance, the E decreases from 56.54 to 35.75 kJ/mol when the Fe₂O₃ proportion increases from 0 to 5.0wt%, which supports the improved combustion performance. Moreover, it is uneconomic to utilize pure Fe₂O₃ and CaO in production. Based on economy analysis, we selected the iron-bearing dust (IBD) which contains much Fe₂O₃ and CaO component to investigate, and got the same effects. Therefore, the IBD is a potential option for catalytic PC combustion in BF process.
- pulverized coal;
- combustion performance;
- blast furnace;
- kinetics;
- additives

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