Abstract
A formulation is presented of physical and mathematical parts of models of electromagnetic processes in electric arc steel-smelting furnaces. The model makes it possible to take into account energy release due to current flowing in the furnace workspace, including conduction currents and induced currents in the charge from interaction of electromagnetic fields in a three-phase system with the charge and melt. As a result of defining the problem of electromagnetic field parameters, the maximum field intensity located inside an area that is limited by the pitch circle diameter is found. It can also be roughly proposed that the magnetic field strength decreases inversely to squared radios. The magnetic field strength decreases by more than 20 times on the surface of water-cooled wall panels, and, consequently, the electromagnetic losses in these panels appear negligibly small for the furnace system under consideration. Solution of the electromagnetic problem of examination conduction currents flows gives a vector distribution of current density in electrodes and charge for different periods of melting—the period of initial trunk melting, the period of trunk formation before trunk decay, and the period of burning of arc discharges on melt of slag and metal. Simulation results allow the causes to be fund of unstable burning of arc discharges during initial melting periods, as well as the variations of sound furnace characteristics and the apparent changes of potential gradients in the arcs during trunk melting in the charge.
Published Version
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