Physical modelling of hot metal flow in a blast furnace hearth

Luomala, Matti Juhani; Mattila, Olli; Härkki, Jouko

doi:10.1034/j.1600-0692.2001.300405.x

Cited by 12 publications

(6 citation statements)

References 8 publications

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“…Based on the findings from a previous study 7) that viscous fingering is more likely to take place in a non-uniform bed than in a uniform one, it is expected that the existence of a coke-free zone in the BF hearth, which has been widely reported, [16][17][18][19] would influence the G-L interface stability. This was examined uring the packed bed model.…”

Section: Effect Of Coke-free Zonementioning

confidence: 99%

Cold Model Study of Blast Gas Discharge from the Taphole during the Blast Furnace Hearth Drainage

et al. 2012

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Blast gas discharge from the taphole in the course of the blast furnace hearth drainage was experimentally studied using a packed bed cold model. It was found that gas break-through time was strongly influenced by the furnace operating conditions and coke bed structure. Gas break-through time decreases with (a) increasing draining rate; (b) decreasing slag and iron levels in the hearth; and (c) increasing slag viscosity. It increases with an increase in the coke-free layer depth and coke-free space width. Under certain conditions, the gas-liquid interface in the region directly above the taphole becomes unstable, leading to viscous finger formation and subsequently early blast gas discharge from the taphole. The amount of blast gas entrained into the taphole due to viscous fingering, when it occurs, is sufficient to cause a splashy taphole stream.KEY WORDS: blast gas discharge; splashy taphole; viscous fingering; hearth drainage; blast furnace; ironmaking.

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Section: Effect Of Coke-free Zonementioning

confidence: 99%

Cold Model Study of Blast Gas Discharge from the Taphole during the Blast Furnace Hearth Drainage

et al. 2012

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“…The BF hearth phenomena have been investigated mainly based on mathematical and experimental modeling because the in‐hearth variables cannot be directly measured during the continuous operation . As for the skulling behavior, Zhao et al were among the first to put dedicated efforts into simulating skull formation utilizing a two‐dimensional computational fluid dynamics (CFD) model .…”

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confidence: 99%

An Experimental Technique for Investigating the Skulling Behavior in the Blast Furnace Hearth

Shao

Taskinen²,

Jokilaakso³

et al. 2018

steel research int.

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The skulling behavior in the blast furnace (BF) hearth has yet to be investigated as few (if any) industrial/experimental studies with particular focus on hot metal are reported in the open literature. As a necessary first step toward a better understanding of the sophisticated behavior, an experimental technique is introduced in the present paper. The experimental apparatus, which mainly consists of a vertical tube furnace, a rotating and moveable pedestal, and a moveable water‐cooled probe covered with a multi‐layer structured refractory sleeve can utilize industrial coke, pig iron, and BF hearth carbon brick as raw materials. The technique is shown to be capable of producing chemical, thermal, and mechanical conditions similar to those in the real process. The feasibility and potential of the technique are demonstrated by a set of experimental runs. The results indicate that the air gap between the cooling device and the refractory lining plays a decisive role in both skull formation and lining erosion. Furthermore, the microstructure of graphite precipitated during solidification is influenced by the cooling rate, which in practice is affected by the BF hearth operating parameters. It is hoped that the current contribution will stimulate the growing research interest in this subject.

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“…The descent of burden during casting can be very rapid and irregular, which could endanger the safety and stability of the furnace. [2][3][4][5] In addition, the long accumulation time causes distortion of the raceway, fluctuation in gas distribution, increased thermal requirement and fluctuation in the chemistry of hot metal and slag. Furthermore, it is known that large amount of liquid remains inside the hearth even after tapping is over, which implies that the hearth is never totally clean and a 'dry hearth' in practice is never achieved.…”

Section: List Of Symbolsmentioning

confidence: 99%

Quantification of blast furnace hearth drainage parameters through physical model study

Desai¹,

Lenka²

2007

Ironmaking & Steelmaking

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The present study on hearth drainage phenomena was conducted by setting up a 1:10 scaled down three-dimensional physical model of G blast furnace hearth, Tata Steel. The novelty of this study is the use of thermocole balls which do not get wetted by liquid and thus simulate hearth conditions correctly. The effect of variables, such as blast pressure, taphole length, taphole diameter, taphole angle and initial liquid height in the blast furnace hearth on residual ratio of the liquid in water model has been studied.

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Physical modelling of hot metal flow in a blast furnace hearth

Cited by 12 publications

References 8 publications

Cold Model Study of Blast Gas Discharge from the Taphole during the Blast Furnace Hearth Drainage

Cold Model Study of Blast Gas Discharge from the Taphole during the Blast Furnace Hearth Drainage

An Experimental Technique for Investigating the Skulling Behavior in the Blast Furnace Hearth

Quantification of blast furnace hearth drainage parameters through physical model study

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