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Mathematical and Physical Simulation of a BOF Converter
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.ORCID iD: 0000-0001-6212-7662
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , x, 29 p.
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-150413ISBN: 978-91-7595-226-0 (print)OAI: oai:DiVA.org:kth-150413DiVA: diva2:743157
Presentation
2014-09-25, Sal Sefström M131, Brinellvägen 23, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2014-09-08 Created: 2014-09-03 Last updated: 2014-11-21Bibliographically approved
List of papers
1. Mathematical and physical simulation of a top blown converter
Open this publication in new window or tab >>Mathematical and physical simulation of a top blown converter
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2014 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 85, no 2, 273-281 p.Article in journal (Refereed) Published
Abstract [en]

A mathematical model of a top blown converter, which was based on a physical model of a 30 t vessel, was developed in this study. A simplified model consisting of the converter was used in the mathematical simulation. With the simplified model, it is possible to run a large number of tracer calculations within a short time, compared to solving for the entire flow evolution each time. A cavity depth and radius comparison has been done between the physical model and the mathematical model, which showed a good relative difference of 2.5% and 6.1% for the cavity depth and radius, respectively. The velocity change in the bath of the converter was monitored by setting several monitoring points in the physical model. A fully developed flow field was assumed to occur when the fluctuations in these points were small or periodic. It took approximately 25 s to get a developed flow field. In addition, the predicted mixing time showed a good relative difference of 2.8% in comparison to the experimental data. A simplified model consisting of the converter has been used in the mathematical simulation. The comparison between the physical model and the mathematical model shows that the simplified top blown model can successfully be used to calculate long-time simulations, and the mixing time calculations in frozen field can save a large amount of time compared to the simulation time using a transient flow field.

Keyword
converter, mixing time, cavity, simplified model, top blown
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-142979 (URN)10.1002/srin.201300310 (DOI)000331948200011 ()2-s2.0-84893635768 (Scopus ID)
Note

QC 20140314

Available from: 2014-03-14 Created: 2014-03-14 Last updated: 2017-12-05Bibliographically approved
2. Optimization of Combined Blown Converter Process
Open this publication in new window or tab >>Optimization of Combined Blown Converter Process
2014 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 54, no 10, 2255-2262 p.Article in journal (Refereed) Published
Abstract [en]

A 1/6th scaled down physical model was used to study and optimize the stirring condition of a 30 t converter. A number of parameters were studied and their effects on the mixing time were recorded. A new bottom tuyere scheme with an asymmetrical configuration was found to be one of the best cases with respect to a decreased mixing time in the bath. Mathematical modeling was employed to study the flow field characteristics caused by the new tuyere scheme. In the mathematical model, a comparison between the existing and the new tuyere setups was made with regards to the mixing time and turbulence in the bath. In addition, a new volumetric method for calculating the mixing time was applied. The results showed that, on average, a 23.1% longer mixing time resulted from the volumetric method compared to the standard method where discrete point are used to track the mixing time. Furthermore, an industrial investigation was performed to check the effects of the new tuyere scheme in a converter by analyzing the [O], [C] and [P] contents in the bath. The results showed that the application effects of the new tuyere scheme yield a better stirring condition in the bath compared to the original case.

Keyword
Combined blown, Converter, Industrial experiment, Mixing time, Optimized scheme
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-150640 (URN)10.2355/isijinternational.54.2255 (DOI)000343741200016 ()2-s2.0-84908473652 (Scopus ID)
Note

QC 20141121. Updated from manuscript to article in journal. Previous title: "Optimization of the Combined Blown Converter Process".

Available from: 2014-09-08 Created: 2014-09-08 Last updated: 2017-12-05Bibliographically approved

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Zhou, Xiaobin

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