Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Simulation of the Steel Sampling Process
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.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2010 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 50, no 12Article in journal (Refereed) Published
Abstract [en]

This work presents a theoretical study of the liquid steel sampling process in the iron &steel industry. As a continuous research with the previous work, the initial solidification duringthe sampler filling was taken into account. The liquid steel sampling procedure, which ismainly used to monitor whether the steel is at the correct composition during the steelmaking,can also be applied to examine the inclusion size characteristics. Focus was on the influence ofthe initial solidification on the inclusion concentrations. The whole sampling system wasmodeled in order to obtain a simulation result which is realistic from an industrial perspective.Argon-protected sampling was the focus in the simulations. A discrete phase model was usedto simulate the movement of inclusions in the liquid steel. Inclusions were injected from theinlet pin of the lollipop-shaped sampler. Some selected different sized primary inclusions thatexist in the ladles during a steelmaking process were simulated. The conclusion from this workis that turbulent flow patterns within the sampler mold will change because of the spaceshrinkage due to the solidification. This, in turn, will also affect the inclusion dispersions. Itconcludes that the preferred position for detecting inclusions is the bottom region, except thebottom surface. It estimates that the mean deviation between the calculated result and the initialconcentration for all inclusions in these regions is within 10%.

Place, publisher, year, edition, pages
2010. Vol. 50, no 12
Keyword [en]
liquid steel sampling, sampler, solidification, flow fields, CFD, mathematical modeling, Wilcox k-ω turbulence model, inclusion concentration
Identifiers
URN: urn:nbn:se:kth:diva-24416ISI: 000285666400004Scopus ID: 2-s2.0-79952044944OAI: oai:DiVA.org:kth-24416DiVA: diva2:349546
Note
QC 20100907Available from: 2010-09-07 Created: 2010-09-07 Last updated: 2017-12-12Bibliographically 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

Open Access in DiVA

No full text

Scopus

Search in DiVA

By author/editor
Zhang, ZhiTilliander, AndersKarasev, AndreyJönsson, Pär
By organisation
Applied Process Metallurgy
In the same journal
ISIJ International

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 65 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf