Loading patent…
AssigneeDanieli & C. Officine Meccaniche SpA
InventorsMilorad Pavlicevic, Anatoly Kolesnichenko, Alfredo Poloni, Cristina Bassi
Estimating the term…
Method for the electromagnetic stirring of the liquid metal (14) in direct current electric arc furnaces which include a hearth (35) defined by a floor (13) and by side walls (15), a central cathode (11) cooperating with anodes (12) arranged on the floor (13) of the furnace and fed by a main current (I.sub.0), wherein there is an electromagnetic system generating a magnetic field inside the liquid metal (14) whose vertical (B.sub.z) and radial (B.sub.r) components interact respectively with the radial (J.sub.r) and vertical (J.sub.z) components of the overall current present in the liquid metal (14). The method and device use a first electromagnetic system including at least a first winding (19) through which a current (I.sub.1) flows and operating from inside the floor (13) and the walls (15) of the hearth (35), and a second electromagnetic system generating a secondary induced current (I.sub.3), between adjacent anodes (12), which circulates through the liquid metal (14). The first winding includes a plurality of spirals (20), at least some of the spirals (20) being arranged inside the refractory of the hearth (35) in cooperation with the floor (13) and with at least a vertical segment of the side walls (15).
Method for the electromagnetic stirring of liquid metal in direct current electric arc furnaces comprising a hearth containing the liquid metal bath defined by a floor and by side walls made of refractory material, the electric arc furnaces including a central cathode cooperating with a plurality of anodes distributed on the floor, comprising the steps of feeding the anodes by a main current (I.sub.0) which flows through the liquid metal towards the central cathode generating the electric arc, and generating a magnetic field inside the liquid metal whose vertical component (B.sub.z) and radial component (B.sub.r) interact respectively with a radial component (J.sub.r) and a vertical component (J.sub.z) of an overall current present in the liquid metal in order to generate electromagnetic forces (f.sub..phi.) to agitate the liquid metal, wherein the magnetic field is generated by at least a first electromagnetic system comprising at least a first winding through which a current (I.sub.1) flows, wherein the first winding comprises a plurality of spirals, at least some of the spirals being arranged inside the refractory of the hearth in cooperation with the floor and with at least a vertical segment of the sidewalls, and wherein the overall current comprises at least the main current (I.sub.0).
A direct current electric arc furnace including a device for the electromagnetic stirring of liquid metal, comprising a hearth containing the liquid metal bath defined by a floor and by side walls made of refractory material, a central cathode cooperating with a plurality of anodes distributed on the floor, the anodes being fed by a main current (I.sub.0) which flows towards the central cathode generating the electric arc, the device for the electromagnetic stirring comprising an electromagnetic system generating a magnetic field inside the liquid metal including a first electromagnetic system comprising at least a first winding through which a current (I.sub.1) flows, said first winding comprising a plurality of spirals, at least some of the spirals being arranged inside the refractory of the hearth in cooperation with the floor and with at least a vertical segment of the side walls.
Device as in claim from 13, in which the secondary induced current (I.sub.3) circulating between the anodes interacts with the components of the magnetic field of the first and the second winding so as to produce electromagnetic forces (f.sub..phi.) with a helical trend to stir the liquid metal.
Device as in claim from 12, in which at least some of the spirals of the first winding are located inside the refractory adjacent to a ferromagnetic shell which surrounds at least the hearth of the furnace, there being included pole pieces between adjacent spirals.
Dependencies are inferred from the claim text.