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For evaluation of hearth wear in a blast furnace by liquid flow phenomena, taking into consideration the shape and the position of the "dead man", a 1 :10 hearth model was used. Hot metal was simulated by water and refractory materials by carbohydrate specimens. This technique is applicable for simulating nearly all processes in which a soluble solid comes into contact with unsaturated fluid. The results confirmed that a possible strategy for reducing the risk of a breakout is to choose an undissoluble (ceramic) lining for the side wall and a less-durable lining for the bottom. Low-refractory wear can be expected when the sump depth is low enough that the dead man covers the whole hearth bottom, because the absence of a coke-free region leads to a low-flow velocity level and a low- mass transfer from the side wall to the hot metal.

The effects of levels and flow of hearth liquid upon blast furnace operation and hearth wear were determined through a combination of laboratory and plant-based studies and measurements. Liquid level determination on operational blast furnaces was carried out using EMF measurement. In a newly constructed physical model, the influence of the liquid in the blast furnace upon blast furnace operation and hearth wear, that means liquid height, casting procedure, liquid viscosity and coke bed properties on the raceway shape and stability, was evaluated. EMF measurements were very erratic and varied considerably around the furnace. After the introduction of an SPC scheme the EMFs became quite steady. EMF data can be of use in estimating hearth liquid level. The physical model work provided useful information on the way the liquid surface deforms during casting and the accompanying pressure distributions.

Additional information

Authors: LUNGEN H ET AL, BFI VDEH Betriebsforschungsinstitut, Dusseldoerf (DE);RUTHER H, Thyssen Krup Staahl GmbH, Duisburg (DE);CLIXBY G, British Steel, Teesside Laboratories, Grangetown, Middlesbrough (UK);CASSELLA ET AL, CSM, Via di Castel Romano, Rome (IT)
Bibliographic Reference: EUR 19347 EN (2000), 193pp, Euro: 29.50
Availability: Available from ECSC-steel Programme Office, European Commission, 200 rue de la Loi, B-1049 Bruxelles (BE), Fax: +32-2-2965897 or email:
ISBN: ISBN: 92-828-6698-X
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