Synergistic effect of blast furnace slag on the pyrolysis process of oil-rich coal, tar product distribution and kinetic analysis

ABSTRACT

Low-rank coal is used as raw material, solid waste blast furnace slag (BFS) rich in metal oxides is selected as catalyst. Co-pyrolysis experiment is carried out and explore the influence of different BFS particle size and doping amount on coal pyrolysis. The catalyst is characterized by FT-IR, XRD, TG, and the contribution degree and mechanism of BFS to the increase of oil-rich kerosene products are clarified. The results show that BFS exhibits good activity. When the added amount of BFS is 9%, the tar yield is as high as 14.65%. When the particle size is 2–5 mm, the tar yield is 14.1%. Adding BFS catalyst can improve the tar yield. By controlling the particle size and addition amount, the composition of the tar can be adjusted to achieve directional pyrolysis. According to coal kinetic analysis, when the temperature is 350–600℃, the overall activation energy in the pyrolysis process is the highest, and the first reaction is the most active.

Graphical abstract

KEYWORDS:

• Co-pyrolysis
• coal
• blast furnace slag
• coal tar
• kinetics

Author contributions

Conceptualization, Zhang Lei; Methodology, Hao Shu; Software, Jia Yang; Validation, Hao Shu; Investigation, Hao Shu; Data Curation, Hao Shu; Writing-Original Draft Preparation, Zhang Lei; Writing-Review & Editing, Hao Shu.

Disclosure statement

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

Supplementary material

Supplemental data for this article can be accessed on the publisher’s website.

Additional information

Funding

This work was supported by Shannxi Key Research and Development Project [2019ZDLSF05-05-01]; 2019 Shaanxi Provincial Natural Science Basic Research Program Enterprise Joint Fund Project [2019JL-01]; and Open Fund of Shaanxi Key Laboratory of Geological Support for Coal Green Exploitation [NO. DZBZ2020-08].

Notes on contributors

Shu Hao

Shu Hao, Ph.D., studied at Xi'an University of Technology, School of Water Resources and Hydroelectric Engineering. His major is environmental science and engineering. The research direction is the development and functional utilization of coal-based solid waste materials.

Lei Zhang

Lei Zhang, professor, graduated from Beijing University of Mining and Technology, and currently works in the School of Geology and Environment at Xi'an University of Science and Technology. The research direction is the development and functional utilization of solid waste materials, and the removal of atmospheric pollutants (SO2, NOx, Hg, VOC).

Yang Jia

Yang Jia, Ph.D., studied at Xi'an University of Technology, School of Water Resources and Hydroelectric Engineering. His major is environmental science and engineering. The research direction is the clean utilization of coal, the research and efficient utilization of coal-based catalysts. Published many high-quality academic papers.