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The behavior of impurities during producer gas implementation as alternative fuel in steel reheating furnaces: A CFD and thermochemical study
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
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2016 (English)In: ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), American Society of Mechanical Engineers (ASME) , 2016Conference paper, Published paper (Refereed)
Abstract [en]

The use of available and cheap industrial producer gases as alternative fuels for the steel reheating furnaces is an attractive topic for steel industry. The application of producer gases for such furnaces introduces not only the complicated combustion system of Low Calorific Value (LCV) gases, but also several impurities that could be problematic for the quality of final steel products. The quality of steel can be highly affected by the interaction of impurities with iron-oxides at hot slab surfaces. In this research, the combustion of producer gases and the behavior of impurities at the steel slab surface are studied by aid of a novel coupled computational fluid dynamics (CFD) and thermodynamics approach. The impurities are introduced as mineral ash particles with the particle size distributions of 15-100 νm. The CFD predicted data regarding the accumulation of ash particles are extracted from an interface layer at the flaring gas media around the steel slab surface. Later on, these predicted data are used for the thermo-chemical calculations regarding the formation of sticky solutions and stable phases at the steel slab surface. The results show that the particles are more likely follow the flow due to the high injection velocity of fuel (70 m/s) and the dominant inertial forces. More than 90 percent of particles have been evacuated through the exhaust pipes. The only 10 percent of remaining particles due to the high recirculation zones at the middle of furnace and the impinging effect of front walls tend to stick to the side wall of slab in the heating zone more than the soaking zone. 

Place, publisher, year, edition, pages
American Society of Mechanical Engineers (ASME) , 2016.
Keywords [en]
Ash particles, CFD, Impurities, Producer gas, Reheating furnace, Thermodynamics, Combustion, Computational fluid dynamics, Fuels, Furnaces, Gases, Heating furnaces, Industrial furnaces, Industrial heating, Phase interfaces, Slab mills, Steelmaking, Combustion systems, Inertial forces, Interface layer, Recirculation zones, Reheating furnaces, Thermo-chemical, Alternative fuels
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42157DOI: 10.1115/IMECE201667168Scopus ID: 2-s2.0-85021898266ISBN: 9780791850589 (print)OAI: oai:DiVA.org:ri-42157DiVA, id: diva2:1384366
Conference
ASME 2016 International Mechanical Engineering Congress and Exposition, IMECE 2016, 11 November 2016 through 17 November 2016
Available from: 2020-01-09 Created: 2020-01-09 Last updated: 2020-01-09Bibliographically approved

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CiteExportLink to record
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