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Design of magnetic fields for half and full type electromagnetic swirl flow generators
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.
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2015 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 86, no 4, 361-374 p.Article in journal (Refereed) Published
Abstract [en]

In this work, the placement of an electromagnetic swirl flow generator (EMSFG) around a submerged entry nozzle (SEN) was proposed as a method for generating a rotating electromagnetic field in a continuous casting (CC) process of steel. First, two kinds of a full type EMSFG and a half type EMSFG were designed based on mathematical modeling. Then, distributions of magnetic flux intensity in an EMSFG as well as distributions of Lorentz force in molten steel were simulated. It was found that the EMSFG structure and electromagnetic parameters have an important effect on magnetic flux intensity and Lorentz force distributions. For both a full type and a half type EMSFG, the magnetic flux intensity and Lorentz force increases as the magnetomotive force increases. Especially, for a full type EMSFG, the magnetic flux intensity is distributed evenly in molten steel. Moreover, the Lorentz force increases along a radial direction in the molten steel in the SEN. However, for a half type EMSFG, the magnetic flux intensity and Lorentz force decreases gradually towards the region without an EMSFG. Consequently, a full type EMSFG with a 44 000 AT magnetomotive force and a 50 Hz frequency is more suitable to apply in the operation of an EMSFG under actual production conditions.

Place, publisher, year, edition, pages
John Wiley & Sons, 2015. Vol. 86, no 4, 361-374 p.
Keyword [en]
rotating magnetic field, electromagnetic swirl flow generator, full type, half type
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-143900DOI: 10.1002/srin.201300463ISI: 000352712300004Scopus ID: 2-s2.0-84926627883OAI: oai:DiVA.org:kth-143900DiVA: diva2:709486
Note

QC 20150511. Updated from manuscript to article in journal.

Available from: 2014-04-02 Created: 2014-04-02 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Inclusion Motion under a Swirl Flow in the Continuous Casting Process and Wire Feeding in the Induction Furnace
Open this publication in new window or tab >>Inclusion Motion under a Swirl Flow in the Continuous Casting Process and Wire Feeding in the Induction Furnace
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The thesis includes the studies of two phenomena related to continuous casting. One subject is the inclusion motion in the submerged entry nozzle (SEN) and mold when using a swirl flow. The swirl flow is generated in a SEN by using an electromagnetic swirl flow generator (EMSFG). The other subject is focused on FeSiRE particles (powder) that are added into the molten steel by using a wire feeding method, which in the future could be used in a continuous casting mold.

Firstly, two kinds of a full type and a half type EMSFG were designed based on mathematical modeling. Then, the distributions of the magnetic flux intensity and the Lorentz force were obtained for two types of EMSFG devices. Based on the results of the Lorentz force, the flow field, temperature field and inclusion motion in the SEN and the mold were studied by using a full type and a half type EMSFG. Moreover, a comparison from the above aspects was investigated between a full type EMSFG and a half type EMSFG. In addition, the effect of different inclusion parameters such as the densities, sizes and boundary conditions, on the inclusion behavior was studied. It was found that light Al2O inclusion moves towards the rotational center by a centrifugal force and that a swirl flow prevents nozzle clogging. The heavy CeO inclusion more or less moves outwards towards the SEN wall and they may stick to the wall. It was also found that the inclusion separation to a mold meniscus increased and that the inclusions being trapped into a solidified shell decreased when using a swirl flow compared to when not using a swirl flow.

A study of a wire feeding into molten steel in an induction furnace was done to determine the potential to implement wire feeding into a mold in the future. A major difference compared to a traditional solid wire is that the wire contains particles (powder). Firstly of all, the wire melting behavior in the molten steel was studied. More specially, the influence of the different wire materials (aluminum, copper and 316L stainless steel wires) on the dissolution time in the molten steel was modeled. Moreover, these simulation results were compared to experimental results. In addition, the FeSiRE particle (powder) motion in the induction furnace was also simulated. The results showed that the copper wire is more suitable to apply in the continuous casting mold when a small addition and a lower wire feeding speed are used. Conversely, if a large amount and a higher feeding speed are needed, the aluminum wire may be recommended for injections in the mold. The results also indicated that the thermal properties of particle (powder) have an influence on the wire melting behavior in the molten steel.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. ix, 71 p.
Keyword
inclusion motion, swirl flow, rotating magnetic field, electromagnetic swirl flow generator, full type, half type, submerged entry nozzle, mold, wire feeding, melting behavior, FeSiRE particle (powder) motion, induction furnace
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-175999 (URN)978-91-7595-736-4 (ISBN)
Public defence
2015-11-27, Sal D3, Lindstedtsvägen 5, KTH, Stockholm, 10:00 (English)
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Note

QC 20150102

Available from: 2015-11-02 Created: 2015-10-27 Last updated: 2015-11-02Bibliographically approved

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