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The feasibility of replacing coal with biomass in iron-ore pelletizing plants with respect to melt-induced slagging
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy. Luleå University of Technology, Sweden.
LKAB, Sweden.
LKAB, Sweden.
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy. Luleå University of Technology, Sweden.ORCID iD: 0000-0002-9395-9928
2020 (English)In: Energies, E-ISSN 1996-1073, Vol. 13, no 20, article id 5386Article in journal (Refereed) Published
Abstract [en]

Combustion-generated fly ash particles in combination with the particles arising from the disintegration of iron-ore pellets, could give rise to the build-up of deposits on the refractory linings of the induration facility. Due to climate change and other environmental issues, there is a desire to cut down on use of fossil fuels. Therefore, it is of interest to investigate the feasibility of replacing coal with less carbon-intensive alternatives such as upgraded biomass, e.g., biochar and pyrolysis bio-oil. While the combustion of biomass can be carbon-neutral, the effects of biomass ash upon slagging during the iron-ore pelletizing process in a grate-kiln setup is unknown. In the present study, the effect of the interaction between the pellet dust and biomass-ash upon melt formation and the viscosity of the resulting melt, which can collectively affect melt-induced slagging, was theoretically assessed. The slagging potential of 15 different biomass fuels, suitable for the pelletizing process, was quantified and compared with one another and a reference high-rank coal using a thermodynamically derived slagging index. The replacement of coal with biomass in the pelletizing process is a cumbersome and challenging task which requires extensive and costly field measurements. Therefore, given the wide-ranging nature of the biomasses investigated in this study, a prescreening theoretical approach, such as the one employed in the present work, could narrow down the list, facilitate the choice of fuel/s, and help reduce the costs of the subsequent experimental investigations. © 2020 by the authors.

Place, publisher, year, edition, pages
MDPI AG , 2020. Vol. 13, no 20, article id 5386
Keywords [en]
Fuel-ash, Iron-ore pelletizing, Pellet dust, Slagging/deposition, Thermochemical equilibrium calculations, Biomass, Carbon, Climate change, Coal, Coal combustion, Disintegration, Economic geology, Fly ash, Fuels, Iron deposits, Iron ores, Pelletizing, Carbon neutrals, Environmental issues, Experimental investigations, Field measurement, Iron ore pelletizing, Pyrolysis bio-oil, Refractory lining, Theoretical approach, Iron ore pellets
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-50350DOI: 10.3390/en13205386Scopus ID: 2-s2.0-85093113967OAI: oai:DiVA.org:ri-50350DiVA, id: diva2:1498735
Note

Funding details: Energimyndigheten, 42684-2; Funding details: Energimyndigheten; Funding text 1: Funding: This research was funded by the Swedish Energy Agency, grant number 42684-2, HYBRIT (Hydrogen Breakthrough Ironmaking Technology)—Research project 1.; Funding text 2: Acknowledgments: This work has been conducted as part of the HYBRIT research project RP1. We gratefully acknowledge the financial support from the Swedish Energy Agency. HYBRIT (Hydrogen Breakthrough Ironmaking Technology) is a joint initiative of the three companies SSAB, LKAB and Vattenfall with the aim of developing the world’s first fossil-free ore-based steelmaking route.

Available from: 2020-11-05 Created: 2020-11-05 Last updated: 2023-08-28Bibliographically approved

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Wiinikka, Henrik

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