Abstract
The modern direction of improving the technology of steel production in high-power arc furnaces is the intensification of magnetohydrodynamic effects for melt mixing. In this regard, it is relevant to study the characteristics of heat trans-fer in the melt of this furnace, taking into account the interaction of electrovortex and thermogravitational convection. The results were obtained using a three-dimensional mathematical model of magnetohydrodynamic and thermal pro-cesses, constructed using a non-inductive approximation, taking into account the k- turbulence model. As heat-generating sources, the model takes into account the heat flows from electric arcs and Joule heating. Processing of the results was carried out using visualization methods of vortex structures. A furnace design containing three arched and three bottom electrodes and providing the formation of additional electrovortex flows in the melt is proposed. It is shown that under the given simulation conditions and currents in 80 kA electrodes a multivortex flow is formed in the furnace melt as a result of the interaction of electrovortex and thermogravitational convection. Electrovortex convection dominates near the bath axis. Thermogravitational convection, due to uneven heating of the melt, leads to a reduction in the size of the main electrovortex flow and the formation of an additional flow near the side walls of the furnace. Maximum speeds of 2 m/s are fixed in the melt areas under electric arcs. In this case, the speed of the downward flow under the electric arcs decreases, and the speed of the upward flow in the region of the bottom elec-trodes increases. The effect of thermogravitational convection on the azimuthal melt flow is manifested mainly in the region of the bottom electrodes, leading to an increase in the azimuthal velocity and displacement of the vortices to the center of the bath. The verification of the proposed model was carried out by comparing the calculation results with the experimental data obtained in laboratory installations with various electrode arrangements. The results will be used to further improve the energy and design parameters of arc furnaces.
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