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- W4234364755 abstract "The aim of this investigation is to explain and to predict the wear line (mushrooming effect) in the hearth of a blast furnace. In the regions of erosion a high flow rate seems to be necessary. With numerical fluid flow computations the flow behaviour of the iron will be simulated during a tapping cycle. The mathematical basis for this description are the Boussinesq-equations. The vertical movement and the shape of the coke zone (dead man) will be taken into consideration as this has a strong influence on the flow pattern. For this purpose the equilibrium of forces (burden, coke, pressure, buoyancy forces of slag and iron) within the furnace was considered. Good results of the fluid flow computations and water model experiments were achieved. The dimensionless parameters of the model and the furnace were in agreement even for the temperature. The temperature induced convection is quite small compared with the forced convection due to tapping. The thermal effects are responsible for the horizontal thermal layering of the fluid. In the case of a floating dead man, a large porous free region exists at the bottom of the hearth. A ring-shaped channel flow with a high flow rate along the periphery will be formed if the dead man is “sitting” at the bottom. The implication of this is the suggestion that the ring-shaped channel flow is responsible for the hearth erosion. Ziel dieser Untersuchung ist die Erklärung des Verschleißprofils (Zwiebelbildung) im Gestell des Hochofens. Dazu scheint in erster Linie eine erhöhte Strömungsbelastung in den Bereichen starken Verschleißes notwendig. Durch numerische Strömungsberechnungen wurde die Roheisenströmung während eines Abstichzyklus simuliert. Die mathematische Grundlage zur Beschreibung des Strömungsverhaltens bilden die Boussinesq-Gleichungen. Lage und Form des Toten Mannes haben einen wesentlichen Einfluß auf die Strömung. Die Lage wurde durch Berechnung der Kräftegleichgewichte im Hochofen ermittelt. Durch Wassermodellversuche konnten die numerischen Strömungsergebnisse verifiziert werden. Die freie Konvektivströmung ist vernachlässigbar. Der Temperatureinfluß ist aber wesentlich für die Schichtung der Strömung. Ein sich während des Abstiches, infolge des Absinkens des Toten Mannes, bildender freier Ringspalt ist die Ursache für die sich einstellende Ringströmung am Boden entlang der Gestellwand. Diese Ringströmung verursacht den hohen Verschleiß in diesem Bereich." @default.
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- W4234364755 date "1992-04-01" @default.
- W4234364755 modified "2023-10-03" @default.
- W4234364755 title "Computation of the iron flow in the hearth of a blast furnace" @default.
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- W4234364755 doi "https://doi.org/10.1002/srin.199200487" @default.
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