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Wear-Model-Based Analysis of the State of Blast Furnace Hearth

MIKKO HELLE, HENRIK SAXE ´ N

2022enblast furnacerefractorieswear modelthermal cyclesmetal composition

Abstract

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The condition and state of the hearth of the blast furnace is of considerable importance since the life length of the refractories governs the campaign length of the furnace, but it is also of significance as it affects the drainage of iron and slag as well as the hot metal temperature and composition. This paper analyzes the hearth of a blast furnace using a model of the lining wear based on the solution of an inverse heat conduction problem, studying the changes in the lining state throughout the campaign. Different operation states are detected, characterized by smooth and efficient hot metal production alongside erratic behavior with large disturbances in the hearth state. During the periods of poor performance, the hearth exhibits cycling states with stages of excessive skull growth on the unworn refractory, followed by periods of dissolution of the skull and lining erosion. An explanation of the transitions is sought by stating and solving a force balance for the deadman with the aim to clarify whether it is floating or sitting. Finally, a connection between the thermal cycles in the hearth and the hot metal sulfur content is demonstrated.

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Cite This Work

@article{fd6376f0-74f0-4478-9b9a-3fcf16aeb129,
  title={Wear-Model-Based Analysis of the State of Blast Furnace Hearth},
  author={MIKKO HELLE and HENRIK SAXE ´ N},
  year={2022},
  language={en}
}
TY  - JOUR
TI  - Wear-Model-Based Analysis of the State of Blast Furnace Hearth
AU  - MIKKO HELLE
AU  - HENRIK SAXE ´ N
PY  - 2022
LA  - en
ER  -

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