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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN='8th ECIC & 9th ICSTI 2022':MAILTO:info@ecic-icsti.com
LOCATION:Room „Lloyd“
SUMMARY:Transient DEM-CFD simulations of a blast furnace tapping process: Effect of flow and carbon dissolution on the movement of coke particles
DESCRIPTION:The lifetime of an industrial blast furnace is strongly affected by the campaign length of the hearth lining. Therefore, understanding the processes related to lining degradation in the hearth is essential. Since on-site measurements and experimental approaches can only provide a limited insight, numerical simulations are a valuable tool to evaluate the complex multiphase flow involved.
The current work presents a numerical DEM-CFD simulation study of the multiphase processes in the blast furnace hearth. The movement of a particulate phase (coke particles), three continuous fluid phases (hot metal, liquid slag, gas) and their interactions are computed by a combined Eulerian-Lagrangian approach.
In the BF hearth movement of the coke bed and the hot metal flow are intimately connected. Therefore, a coupled DEM-CFD approach is necessary to account for the transient movement of the coke particles instead of conventionally assuming a predefined porosity field.
As the calculation of actual size particles in the total hearth is not feasible due to extensive computational cost, a static porosity field is assumed except for the region in front of the taphole. This results in two different domains for the CFD-side (total hearth) and the DEM-simulation (close-up of a coke bed section). Since steep velocity gradients and a high carbon dissolution rate prevail in this specific region, the movement of solid particles is of main interest. In particular, the principal flow direction of particles filling up the void space of dissolved coke is investigated. Since the path line of a single particle is determined by the interaction with the fluids (buoyancy and drag forces) and the mechanical interaction of solids, the numerical approach contributes a valuable insight into BF hearth phenomena, which are otherwise inaccessible.
CLASS:PUBLIC
DTSTART:20220901T085500
DTEND:20220901T092000
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