Direct current arc furnace and method for its operation

F - Mech Eng,Light,Heat,Weapons – 27 – B

Patent

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F27B 3/08 (2006.01) C21C 5/52 (2006.01) H05B 7/06 (2006.01) H05B 7/11 (2006.01)

Patent

CA 2110619

A direct current arc furnace is described with a cathodic electrode held in the centre of the melting vessel and an anodic bottom electrode arrangement in the vicinity of an electrically conductive lower vessel from the vessel wall to the melt. The current supply and removal takes place on one side via leads to a rectifier power supply set up in spaced manner alongside the furnace. The lower vessel is connected in several quadrants with leads and in the vicinity of each quadrant a connecting plate is provided on the furnace wall. Close below the arc the power supplies are led in a horizontal plane to the furnace wall. The current intensity for the quadrants of the lower vessel adjacent to the rectifier power supplies is lower than that of the power supplies to the remaining quadrants. The spacings of the connecting plates for the quadrant areas can be unequal.

Description d'un four à arc à courant continu muni d'une cathode maintenue au centre du récipient de fusion et d'un dispositif à anode près d'un récipient inférieur électriquement conducteur de la paroi du récipient vers le matériau en fusion. L'alimentation en courant et l'interruption du courant s'effectuent sur un côté au moyen de fils allant à un dispositif d'alimentation redresseur installé de manière espacée le long du four. Le récipient inférieur est relié à plusieurs secteurs par des fils, et près de chaque secteur, une plaque de connexion se trouve sur la paroi du four. Tout près sous l'arc, les dispositifs d'alimentation sont reliés dans un plan horizontal à la paroi du four. L'intensité du courant pour les secteurs du récipient inférieur près des dispositifs d'alimentation redresseurs est plus faible que l'intensité du courant des dispositifs d'alimentation reliés aux autres secteurs. L'espacement des plaques de connexion des secteurs peut être inégal.

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