Modelling of the Off-gas Exit Temperature and Slag Foam Depth of an Electric Arc Furnace

A derivation of a dynamic Electric Arc Furnace (EAF) model is shown in Bekker and Bekker, Craig and Pistorius. This model describes the time-evolution of EAF furnace and off-gas system variables. A preliminary verification of this model with measurements taken from an industrial EAF, is discussed in...

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Bibliographic Details
Published inISIJ International Vol. 41; no. 4; pp. 399 - 401
Main Authors Oosthuizen, Daniël Jacobus, Viljoen, Johannes Henning, Craig, Ian Keith, Pistorius, Petrus Christiaan
Format Journal Article
LanguageEnglish
Published Tokyo The Iron and Steel Institute of Japan 01.01.2001
Iron and Steel Institute of Japan
Subjects
Applied sciences
Exact sciences and technology
Metallurgical fundamentals
Metals. Metallurgy
Production of metals
Electric oven
Gas emission
Electric steel plant
Foaming
Steelmaking
Theoretical study
Steel refining
Modeling
Molten steel
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Summary:A derivation of a dynamic Electric Arc Furnace (EAF) model is shown in Bekker and Bekker, Craig and Pistorius. This model describes the time-evolution of EAF furnace and off-gas system variables. A preliminary verification of this model with measurements taken from an industrial EAF, is discussed in Bekker, Craig and Pistorius. In this note the Bekker model is improved and expanded to include some process variables not modelled previously. Improvements are made to the off-gas temperature model, and a slag foam depth model is added. The off-gas model as derived by Bekker is sufficient as far as the CO production rate is concerned. The mass flow through the cooling duct is also fairly accurately modelled. The off-gas temperature model, however, still had room for improvement. There are two main processes in the cooling duct which affect the temperature of the off-gas mixture. Of these, combustion adds heat to the gas, and convective heat transfer to the duct sides extracts heat from the gas. The rates of both processes were initially modelled as being proportional to the difference between the off-gas temperature at the entrance to the cooling duct, and the temperature of the cooling duct walls. These two processes were remodelled to better describe the mechanics of the heat transfer that occurs.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.41.399