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A thermodynamic study of hot syngas impurities in steel reheating furnaces: Corrosion and interaction with oxide scales
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan.
Division of Energy and Furnace Technology, KTH Royal Institute of Technology.
Division of Energy and Furnace Technology, KTH Royal Institute of Technology.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0001-8247-8320
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2014 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 77, p. 352-361Article in journal (Refereed) Published
Abstract [en]

Environmental concerns lead industries to implement gasified biomass (syngas) as a promising fuel in steel reheating furnaces. The impurities of syngas as well as a combination with iron oxide scale form complex mixtures with low melting points, and might cause corrosion on steel slabs. In this paper, the effects of syngas impurities are thermodynamically investigated, when scale formation on the steel slabs surface simultaneously takes place. A steel reheating furnace can be divided into preheating, heating, and soaking zones where the temperature of a steel slab changes respectively. Therefore, the thermodynamic calculation is performed at different temperatures to predict the fate of impurities. Then, the stable species are connected with respective zones in a reheating furnace. It is concluded that reactions due to alkali compounds, chloride, and particulate matter could take place on steel slabs. In the low temperature range, interaction of sodium chloride occured with pure iron prior to scale formation. Then, at high temperature the reactions of impurities are notable with iron oxides due to scale growing. Furthermore, the multicomponent reactions with syngas impurities showed that most of alkali contents evaporate at first stages, and only small amounts of them remain in slag at high temperature.

Place, publisher, year, edition, pages
2014. Vol. 77, p. 352-361
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-11202DOI: 10.1016/j.energy.2014.08.092ISI: 000346542500040Scopus ID: 2-s2.0-84909646337Local ID: a1e06d99-0137-4c53-a720-6583cbd292b6OAI: oai:DiVA.org:ltu-11202DiVA, id: diva2:984151
Note
Validerad; 2014; 20141022 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Grip, Carl-Erik

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