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Understanding of Blast Furnace Performance with Biomass Introduction
Metallurgy Department, Swerim, 974 37 Luleå, Sweden.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. Metallurgy Department, Swerim, 974 37 Luleå, Sweden.ORCID iD: 0000-0003-3363-351X
Relitor, 973 34 Luleå, Sweden.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
2021 (English)In: Minerals, E-ISSN 2075-163X, Vol. 11, no 2, article id 157Article in journal (Refereed) Published
Abstract [en]

The blast furnace still dominates the production and supply of metallic units for steelmaking. Coke and coal used in the blast furnace contribute substantially to CO2 emissions from the steel sector. Therefore, blast furnace operators are making great efforts to lower the fossil CO2 emissions and transition to fossil-free steelmaking. In previous studies the use of pre-treated biomass has been indicated to have great potential to significantly lower fossil CO2 emissions. Even negative CO2 emission can be achieved if biomass is used together with carbon capture and storage. Blast furnace conditions will change at substantial inputs of biomass but can be defined through model calculations when using a model calibrated with actual operational data to define the key blast furnace performance parameters. To understand the effect, the modelling results for different biomass cases are evaluated in detail and the overall performance is visualised in Rist- and carbon direct reduction rate (CDRR) diagrams. In this study injection of torrefied biomass or charcoal, top charging of charcoal as well as the use of a combination of both methods are evaluated in model calculations. It was found that significant impact on the blast furnace conditions by the injection of 142 kg/tHM of torrefied biomass could be counteracted by also top-charging 30 kg/tHM of charcoal. With combined use of the latter methods, CO2-emissions can be potentially reduced by up to 34% with moderate change in blast furnace conditions and limited investments.

Place, publisher, year, edition, pages
MDPI, 2021. Vol. 11, no 2, article id 157
Keywords [en]
bio-coal, blast furnace, heat and mass balance, Rist diagram, CDRR diagram
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy; Centre - Centre for Advanced Mining & Metallurgy (CAMM)
Identifiers
URN: urn:nbn:se:ltu:diva-82826DOI: 10.3390/min11020157ISI: 000622847500001Scopus ID: 2-s2.0-85100178644OAI: oai:DiVA.org:ltu-82826DiVA, id: diva2:1526892
Funder
Luleå University of Technology
Note

Validerad;2021;Nivå 2;2021-02-09 (alebob)

Available from: 2021-02-09 Created: 2021-02-09 Last updated: 2024-01-17Bibliographically approved

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Sundqvist Ökvist, LenaBjörkman, Bo

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