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Measurement techniques for meltdown control in a stainless steel AC electric arc furnace
KTH.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.ORCID iD: 0000-0003-1919-9964
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.ORCID iD: 0000-0001-9775-0382
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2017 (English)In: ESSC and DUPLEX 2017 - 9th European Stainless Steel Conference - Science and Market and 5th European Duplex Stainless Steel Conference and Exhibition, Associazione Italiana di Metallurgia , 2017Conference paper, Published paper (Refereed)
Abstract [en]

A method for vibrational evaluations of spectrogram data from pilot plant measurements was established for obtaining a consistent analysis of the molten scrap state. Not knowing the meltdown progress inside the furnace results in an inefficient power scheduling, which affects refractory life, process time and energy losses. Hence, there exists potential to control the furnace power so that it is kept high while there is sufficient amounts of scrap inside furnace to absorb the input energy. Thus, harmonic distortions of the electric current and measurements of the sound and vibrations emitted from the furnace were correlated to the molten state of the scrap. By using this method, a reduction in melting time in the order of minutes per heat can be obtained. The method was found to give stable signals and it was judged to be a good candidate for implementation in industry. Furthermore, the developed method is universal and may be applied for other types of signals and combined into intelligent soft sensor systems. 

Place, publisher, year, edition, pages
Associazione Italiana di Metallurgia , 2017.
Keywords [en]
Flat bath, Process control, Scrap meltdown, Thd, Vibrations, Electric arcs, Electric furnaces, Energy dissipation, Furnaces, Pilot plants, Vibration analysis, Consistent analysis, Electric arc furnace, Measurement techniques, Plant measurement, Power Scheduling, Soft sensor system, Stainless steel
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236817Scopus ID: 2-s2.0-85049263456ISBN: 9788898990122 (print)OAI: oai:DiVA.org:kth-236817DiVA, id: diva2:1275812
Conference
9th European Stainless Steel Conference: Science and Market, ESSC 2017 and 5th European Duplex Stainless Steel Conference and Exhibition, DUPLEX 2017, 25 May 2017 through 27 May 2017
Funder
Swedish Energy Agency
Note

QC 20190107

Available from: 2019-01-07 Created: 2019-01-07 Last updated: 2019-01-07Bibliographically approved

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Andersson, Nils A. I.Tilliander, AndersJönsson, Pär

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Schmidt, ChristofferAndersson, Nils A. I.Tilliander, AndersJönsson, Pär
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