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Study on Slopping Prevention in the BOF Steelmaking Process
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2017 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 88, no 8, article id UNSP 1600399Article in journal (Refereed) Published
Abstract [en]

A new method of preventing slopping is proposed in this paper, by simply blowing gas at the top of the foam surface. The physical experiment results show that the foam height can be effectively decreased by the top blowing air. The maximum decrease of the foam height can reach around 70 mm with an initial foam height of 145 mm in the current setup, around a 48% decrease. The first 40 mm of the foam height is easy to destroy with a low flow rate from the top. However, it is increasingly difficult for a further decrease in the foam height. Different types of nozzles show a large difference in the role of destroying the foam. The air flow velocity from the nozzle outlet is found to be the key factor for a decreased foam height. Overall, three foam destruction mechanisms are proposed. When the top air flow velocity is small, the drag and pressure destruction mechanisms are the main reasons for the decrease in foam height. However, when a large top air flow velocity is used, the coalescence and breakup mechanisms due to a high turbulence and the shear force on gas bubble shape deformation become important.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2017. Vol. 88, no 8, article id UNSP 1600399
Keywords [en]
slag foaming, physical experiment, BOF, slopping prevention, gas rupture
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-212335DOI: 10.1002/srin.201600399ISI: 000406720700005Scopus ID: 2-s2.0-85009997088OAI: oai:DiVA.org:kth-212335DiVA, id: diva2:1135582
Note

QC 20170823

Available from: 2017-08-23 Created: 2017-08-23 Last updated: 2017-11-13Bibliographically approved

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Ni, PeiyuanErsson, Mikael

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