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

Mikko Helle, Henrik Saxén

2022enblast furnacelining wearheat conductionthermal cyclesmetal composition

Abstract

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The condition and state of the hearth of the blast furnace is vital as the life length of the refractories directly impacts the campaign duration of the furnace. This paper presents an analysis of the blast furnace hearth using a wear model predicated on an inverse heat conduction problem, allowing for an examination of the variations in the lining state throughout the furnace campaign. The study distinguishes between different operational states, identifying periods characterized by stable metal production and those marked by erratic behavior and significant disturbances in hearth conditions. The analysis reveals that during suboptimal performance phases, the hearth experiences a cycling behavior, alternating between excessive skull growth on unworn refractories and subsequent erosion phases. To understand the transitions in hearth conditions, a force balance equation for the deadman is formulated and solved, aiming to ascertain whether it remains in a floating or resting state. Ultimately, the research establishes a link between thermal cycling in the hearth and the sulfur content in the hot metal, thereby contributing to a better understanding of blast furnace operations and wear dynamics.

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Cite This Work

@article{7e51bdbc-8d6e-4f5b-bde6-aae471384601,
  title={Wear-Model-Based Analysis of the State of Blast Furnace Hearth},
  author={Mikko Helle and Henrik Saxén},
  year={2022},
  language={en}
}
TY  - JOUR
TI  - Wear-Model-Based Analysis of the State of Blast Furnace Hearth
AU  - Mikko Helle
AU  - Henrik Saxén
PY  - 2022
LA  - en
ER  -

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