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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN='8th ECIC & 9th ICSTI 2022':MAILTO:info@ecic-icsti.com
LOCATION:Room „Lloyd“
SUMMARY:Estimation of the local wall-mushroom thickness at the blast furnace taphole
DESCRIPTION:The life length of the blast furnace is usually determined by the wear of the hearth refractory, so it is important to estimate the extent of the hearth wear during the campaign. Since it is impossible to directly measure the thickness of the remaining refractories, approaches based on inverse heat transfer formulations have been proposed. These one- or two-dimensional models of the system estimate how the position of the inner hearth profile progresses throughout the campaign by solving a sequence of static states based on temperatures measured by thermocouples in the lining. By this procedure it is also possible to track the formation of skull on the hot face. Crucial parts for the hearth wear are the regions close to the taphole, where the liquid flow is strongest. However, the thermal conditions in these regions make the use of one- or two-dimensional models incorrect since the taphole, when operated, acts as an additional heat source and further induces strong short-term dynamics that should not be neglected.
The paper proposes an inverse heat transfer model that appropriately considers the heat source of the liquids in the taphole and the dynamics caused by the intermittent tapping operation. The model focuses on the region around the taphole and estimates the position of the hot face, i.e., the inner end of the “mushroom” formed by the taphole mud, based on the time evolution of the temperatures of the closest thermocouples in the lining. The paper describes the basic assumptions and equations of the model and presents an application of it to measurements from a large blast furnace. The estimates of the local wall-mushroom thicknesses on the different sides of the taphole are found to be correlated and also to follow the changes in the taphole length, which indicates the feasibility of the approach. 
 
CLASS:PUBLIC
DTSTART:20220630T153500
DTEND:20220630T160000
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