Combustion characteristics and kinetic analysis of co-combustion of desulfurized dust and pulverized coal

ABSTRACT

With the rapid development of desulfurization process, how to efficiently utilize sintered desulfurized dust in the desulfurization process has always been a problem faced by a steel industry. In this paper, the physicochemical properties of Kubasi anthracite coal (RU), Shangwan bituminous coal (SW), and desulfurized dust (TL) were systematically studied by means of X-ray fluorescence spectrophotometer, scanning electron microscopy, and Raman spectroscopy. In addition, the combustion characteristics and mechanisms of anthracite, bituminous, and desulfurized dust mixtures were investigated by thermogravimetric analysis experiments. The results show that the particle size of TL is finer, the degree of graphitization of RU is higher, the combustibility of SW is better than that of RU, and the effects of TL addition on the combustion performance of RU and SW are different. The calculated results of combustion kinetics are in good agreement with the experimental results. With the addition of TL from 3 to 7 wt%, the activation energy of SW decreased from 44.00 to 37.30 kJ/mol. The results provide a theoretical basis for adding desulfurized dust to the blast furnace in the future.

KEYWORDS:

• Thermogravimetric analysis
• desulfurized dust
• synergy effect
• combustion properties
• kinetic model

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 52274316), the National Key R&D Program of China (No. 2022YFE0208100), the Interdisciplinary Research Project for Young Teachers of University of Science and Technology Beijing (Fundamental Research Funds for the Central Universities) (No. FRF-IDRY-20-014), and Anhui Province Key Research and Development Plan (No. 202210700037).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work was supported by the Anhui Provincial Key Research and Development Plan [202210700037]; National Natural Science Foundation of China [52274316]; Fundamental Research Funds for the Central Universities [FRF-IDRY-20-014]; National Key Research and Development Program of China [2022YFE0208100]

Notes on contributors

Shenyang Wang

Shenyang Wang, Department of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, China.

Runsheng Xu

Runsheng Xu, Department of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, China.

Jianliang Zhang

Jianliang Zhang, Department of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, China.

Baijun Yan

Baijun Yan, Department of Metallurgical Physics and Chemistry, University of Science and Technology Beijing, Beijing, China.

Nan Zhang

Nan Zhang, Department of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, China.

Jinhua Li

Jinhua Li, Department of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, China.