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The effect of co-firing coal and woody biomass upon the slagging/deposition tendency in iron-ore pelletizing grate-kiln plants
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. Luossavaara-Kiirunavaara Aktiebolag (LKAB), Luleå, Sweden.
Department of Applied Physics and Electronics, Thermochemical Energy Conversion Laboratory, Umeå University, Umeå, Sweden.
Luossavaara-Kiirunavaara Aktiebolag (LKAB), Luleå, Sweden.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. Luossavaara-Kiirunavaara Aktiebolag (LKAB), Luleå, Sweden.
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2020 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 199, article id 106254Article in journal (Refereed) Published
Abstract [en]

Woody biomass is being considered a potential co-firing fuel to reduce coal consumption in iron-ore pelletizing rotary kilns. An important consideration is the slagging inside the kiln caused by ash deposition that can lead to process disturbances or shutdowns. In terms of ash chemistry, co-firing woody biomass implies the addition of mainly Ca and K to the Si- and Al-dominated coal-ash (characteristic of high-rank coals) and Fe from the iron-ore that are both inherent to the process. An alkali-laden gaseous atmosphere is also present due to the accumulation of alkali via the recirculation of flue gas in the system. The slagging propensity of blending woody biomass with coal in the grate-kiln process was studied based on the viscosity of the molten phases predicted by global thermochemical equilibrium modeling. This was carried out for variations in temperature, gaseous KOH atmosphere, and fuel blending levels. Results were evaluated and compared using a qualitative slagging indicator previously proposed by the authors where an inverse relationship between deposition tendency and the viscosity of the molten fraction of the ash was established. The results were also compared with a set of co-firing experiments performed in a pilot-scale (0.4 MW) experimental combustion furnace. In general, the co-firing of woody biomass would likely increase the slagging tendency via the increased formation of low-viscosity melts. The fluxing behavior of biomass-ash potentially reduces the viscosity of the Fe-rich aluminosilicate melt and intensifies deposition. However, the results also revealed that there are certain conditions where deposition tendency may decrease via the formation of high-melting-point alkali-containing solid phases (e.g., leucite).© 2019 Elsevier

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 199, article id 106254
Keywords [en]
Iron-ore pelletizing, Coal-ash, Biomass-ash, Pellet dust, Deposition (slagging), Thermochemical equilibrium calculations, Viscosity estimations
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-76783DOI: 10.1016/j.fuproc.2019.106254ISI: 000513295200001Scopus ID: 2-s2.0-85074608707OAI: oai:DiVA.org:ltu-76783DiVA, id: diva2:1371534
Note

Validerad;2019;Nivå 2;2019-12-03 (johcin)

Available from: 2019-11-20 Created: 2019-11-20 Last updated: 2020-03-10Bibliographically approved

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Sefidari, HamidLindblom, BoWiinikka, HenrikÖhman, Marcus

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