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Simulation of the Filling of a Liquid Steel Sampler
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, Applied Process Metallurgy.
2010 (English)In: Steel Research International, ISSN 1611-3683, Vol. 81, no 9, 749-758 p.Article in journal (Refereed) Published
Abstract [en]

Steel samples extracted from the ladle furnace in liquid state are vital to monitor the steel making process in the iron & steel industries. The main function of the steel sample is to exam whether the steel is at the aimed composition for elements that dissolve in steel. In addition, more interest is arising to determine the inclusion characteristics in steel samples, in order to monitor the development throughout the process. However, the molten steel sampling is a process involving multi-phenomena such as a high temperature, a fast solidification, reoxidation of steel and a highly turbulent flow pattern. Therefore, mathematical simulations have been carried out to fundamentally study the sampler filling process. The Wilcox k-ω turbulence model was employed to predict the turbulent flow. The calculated results show that flow patterns inside the sampler can be classified into three distinct flow regions: the vortex flow region close to the free surface, the lower horizontal flow region and the middle vertical flow region. From the flow and turbulence data, the inclusion particle collision volume rate was calculated to study the influence of turbulent flow on the inclusion growth in the sampler during fillings. It is shown that the collision volume in the sampler is much higher than that found in the ladle furnace, where the steel sampling normally takes place. This is due to the high turbulence energy dissipation rate in the samplers compared to the ladles.

Place, publisher, year, edition, pages
2010. Vol. 81, no 9, 749-758 p.
Keyword [en]
steel sampler, simulations, turbulent flow, Wilcox k-ω turbulence model, turbulence energy dissipation rate, collision volume
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-24415DOI: 10.1002/srin.201000107ISI: 000281912200008Scopus ID: 2-s2.0-77956585289OAI: oai:DiVA.org:kth-24415DiVA: diva2:349543
Note
QC 20100907Available from: 2010-09-07 Created: 2010-09-07 Last updated: 2011-11-06Bibliographically approved
In thesis
1. On the Study of a Liquid Steel Sampling Process
Open this publication in new window or tab >>On the Study of a Liquid Steel Sampling Process
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The liquid steel sampling method is one of the commonly used procedures in monitoring the steelmaking process. Besides it can be used for analyzing the dissolved alloys, hydrogen content and oxygen content, it can be also employed to monitor the inclusion characteristics at the steelmakings. Here, a crucial point is that the steel sampler should be filled and the metal solidifies without changing the inclusion characteristics. Therefore, the objective of this work is to fundamentally understand the liquid steel sampling process by means of analyzing and modeling the two-phase flow during the sampler filling process, and verifying the mathematical model by using the experimental data.

The present dissertation presents an experimental and theoretical study of the filling process of both the lollipop-shaped sampler and the rectangular-shaped sampler. Firstly, a physical modeling by using a water model has been carried out to fundamentally investigate the flow pattern inside the sampler vessels during its filling. The flow patterns were obtained by a PIV system. Then, a mathematical model has been built to theoretically understand the phenomena. The commercial CFD code was used. Here, different turbulence model have been compared between the realizable k-ε turbulence model and Wilcox k-ω turbulence model. It concludes that the Wilcox k-ω turbulence model agrees well with the PIV measurements.HH

Thus, the preferred it was further employed to predict the turbulent flow inside the production lollipop-shaped sampler fillings. It is important to find that the average collision volume in the production steel sampler without solidification at filling is about 30 times higher than that in a ladle furnace.

In the end, the whole sampling system was modeled. The initial solidification during the filling was taken into account. Focus was on the influence of the initial solidification on the inclusion concentrations. A discrete phase model was used to simulate the movement of inclusions in the liquid steel. Some selected different sized primary inclusions that exist in the ladles at a steelmaking process were simulated.

The same method of studying the filling procedure of the lollipop-shaped sampler was further applied to comprehensively investigate the rectangular-shaped sampler.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 47 p.
National Category
Metallurgy and Metallic Materials Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-24385 (URN)978-91-7415-704-8 (ISBN)
Public defence
2010-09-17, Salongen KTHB, Osquars Backe 31,KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100908Available from: 2010-09-08 Created: 2010-09-07 Last updated: 2012-02-24Bibliographically approved

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