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A Study of Dynamic Lining Temperature Variations in the Taphole Region of a Blast Furnace
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.
(English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344XArticle in journal (Other academic) Submitted
Abstract [en]

The thermal behavior of the blast furnace hearth with special focus on the taphole regionwas studied. The original lining is in this region assumed to be replaced with tap clay,which influences the dynamic lining temperature variations. A heat transfer modelpreviously developed has been used to study the effect of the size and shape of the tapclay layer around the taphole. Four different cases have been calculated: one referencecase and three cases different tap clay layer geometries. It was found that the calculatedpeak-to-peak amplitudes of the lining temperatures during the tap cycles at the location ofa thermocouple can be approximated as a linear function of the tap clay layer thicknessesfor all calculated cases: the R2-value of the linear approximations were in the range 0.9-0.98. Modeling was also done where both the 90th and the 10th percentile of the observedpeak-to-peak values of the studied tap cycles were included to describe the behavior ofthe operating furnace. The calculation results show that the taphole region can be dividedinto three categories based on how well the model can describe the measured processdata: below, at and above taphole level. Below the taphole level, the measured liningtemperature variations are smaller than for the calculated results. At the taphole level, themodel can describe the behavior of the operating furnace. Above the taphole level, themeasured lining temperature variations are larger than for the calculated results. It wasconcluded, that in order to make a more accurate heat transfer model of the tapholeregion, the presence of a skull build-up below the taphole, erosion above the taphole andthe bath level variations need to be taken into account.

Keyword [en]
Blast furnace, mathematical model, heat transfer, taphole, tap cycles, tap clay
Identifiers
URN: urn:nbn:se:kth:diva-13977OAI: oai:DiVA.org:kth-13977DiVA: diva2:328739
Note

QC20100706

Available from: 2010-07-06 Created: 2010-07-06 Last updated: 2017-12-12Bibliographically approved
In thesis
1. A Study of the Heat Flow in the Blast Furnace Hearth Lining
Open this publication in new window or tab >>A Study of the Heat Flow in the Blast Furnace Hearth Lining
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of the present thesis was to study the heat flows in the blast furnace hearth lining by experimental measurements and numerical modeling. Thermocouple data from an operating furnace have been used throughout the work, to verify results and to develop methodologies to use the results in further studies. The hearth lining were divided into two zones based on the thermocouple readings: a region with regular temperature variations due to the tapping of the furnace, and another region with slow temperature variations. In an experimental study, the temperatures of the outer surfaces of the wall and bottom were measured and compared with lining temperature measured by thermocouples. Expressions to describe the outer surface temperature profiles were derived and used as input in a two-dimensional steady state heat transfer model. The aim of the study was to predict the lining temperature profiles in the region subjected to slow temperature variations. The methodology to calculate a steady state lining temperature profile was used as input to a three-dimensional model. The aim of the three-dimensional model was primarily to study the region with dynamic lining temperature variations caused by regular tappings. The study revealed that the replacement of original lining with tap clay has an effect when simulating the quasi-stationary temperature variations in the lining. The study initiated a more detailed study of the taphole region and the size and shape of the tap clay layer profile. It was concluded, that in order to make a more accurate heat transfer model of the blast furnace hearth, the presence of a skull build-up below the taphole, erosion above the taphole and the bath level variations must to be taken into consideration.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. xiv, 51 p.
Keyword
Blast furnace, heat transfer, mathematical model, experimental
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-13163 (URN)978-91-7415-677-5 (ISBN)
Public defence
2010-06-11, F3, Lindstedtsvägen 26, KTH, Stockholm, 13:00 (English)
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Supervisors
Note
QC 20100706Available from: 2010-05-31 Created: 2010-05-31 Last updated: 2010-12-03Bibliographically approved

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