Open this publication in new window or tab >>Show others...
2024 (English)In: Metals, ISSN 2075-4701, Vol. 14, no 9, article id 969Article in journal (Refereed) Published
Abstract [en]
The steel industry accounts, according to the International Energy Agency, for ~6.7% of global CO2 emissions, and the major portion of its contribution is from steelmaking via the blast furnace (BF) route. In the short term, a significant reduction in fossil CO2 emissions can be achieved through the introduction of bio-coal into the BF as part of cold bonded briquettes, by injection, or as part of coke. The use of bio-coal-containing residue briquettes was previously demonstrated in industrial trials in Sweden, whereas bio-coal injection was only tested on a pilot scale or in one-tuyere tests. Therefore, industrial trials replacing part of the pulverized coal (PC) were conducted. It was concluded that the grinding, conveying, and injection of up to 10% of charcoal (CC) with PC can be safely achieved without negative impacts on PC injection plant or BF operational conditions and without losses of CC with the dust. From a process point of view, higher addition is possible, but it must be verified that grinding and conveying is feasible. Through an experimentally validated computational fluid flow model, it was shown that a high moisture content and the presence of oversized particles delay devolatilization and ignition, lowering the combustion efficiency. By using CC with similar heating value to PC, compositional variations in the injected blend are not critical.
Place, publisher, year, edition, pages
MDPI, 2024
Keywords
bio-coal, charcoal, reducing agent, injection, CO2 emission
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-110273 (URN)10.3390/met14090969 (DOI)001326312800001 ()2-s2.0-85205082989 (Scopus ID)
Funder
Swedish Energy Agency, P44676-1
Note
Validerad;2024;Nivå 2;2024-10-07 (sarsun);
Full text license: CC BY 4.0;
2024-10-072024-10-072024-12-02Bibliographically approved