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A Study of the Heat Flow in the Blast Furnace Hearth Lining

Swartling, Maria, 1983- (author)
KTH,Tillämpad processmetallurgi
Jönsson, Pär G., Professor (thesis advisor)
KTH,Tillämpad processmetallurgi
Bi, Xuegong, Professor (opponent)
Wuhan University of Science and Technology, Department of Metallurgical Engineering
 (creator_code:org_t)
ISBN 9789174156775
Stockholm : KTH, 2010
English xiv, 51 s.
  • Doctoral thesis (other academic/artistic)
Abstract Subject headings
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  • 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.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

Keyword

Blast furnace
heat transfer
mathematical model
experimental
Metallurgical process and manufacturing engineering
Metallurgisk process- och produktionsteknik

Publication and Content Type

vet (subject category)
dok (subject category)

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