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Short-term Lining Temperature Changes during Tapping in 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.
2010 (English)In: Steel Research International, ISSN 1611-3683, Vol. 81, no 9, 724-734 p.Article in journal (Refereed) Published
Abstract [en]

The following paper presents a three-dimensional heat transfer model of the blast furnace hearth. The model has been developed with the objective of studying the short term changes in lining temperature during regular tappings. It is based on the actual conditions of Blast Furnace No. 2 at SSAB Oxelosund in Sweden. The model was evaluated and analysed using thermocouple data from the operating furnace. The study showed that a layer of tap clay around the tap hole had a significant effect on the heat transfer by reducing the heat variations in the lining. More specifically, a layer of 10-15 cm gave the best correlation between calculated and thermocouple data. A simulation was performed where the melt temperature and the tap cycle duration was based on process data from the operating furnace. Moreover, the size of the area subjected to changes due to the regular tappings was defined. It was found to be the region within an angle of 13 degrees from the tap hole, 0.9 m above and 0.8 m below the tap hole.

Place, publisher, year, edition, pages
2010. Vol. 81, no 9, 724-734 p.
Keyword [en]
Blast furnace, mathematical model, heat transfer, taphole, tap cycles, tap clay
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-13976DOI: 10.1002/srin.201000035ISI: 000281912200005Scopus ID: 2-s2.0-77956577386OAI: oai:DiVA.org:kth-13976DiVA: diva2:328736
Note
QC 20100706. Uppdaterad från accepted till published (20101203).Available from: 2010-07-06 Created: 2010-07-06 Last updated: 2010-12-03Bibliographically 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)
Opponent
Supervisors
Note
QC 20100706Available from: 2010-05-31 Created: 2010-05-31 Last updated: 2010-12-03Bibliographically approved

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