Method and device to feed premixed gas to tuyeres of...

C - Chemistry – Metallurgy – 21 – C

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C21C 5/52 (2006.01) F27B 3/22 (2006.01)

Patent

CA 2318150

Method to feed tuyères in an electric furnace, the tuyères comprising a central conduit to deliver a comburent gassy substance and a peripheral conduit to deliver a cooling gassy substance, the method providing to send to the central conduit a comburent mixture consisting of oxygen and neutral gas (N2, Ar, etc.) in defined percentages, the oxygen and the neutral gas being fed, for each of the tuyères, to a mixing device (13) with a high mixing capacity, at least the pressure of the neutral gas being able to be adjusted on the relative feed line so as to modulate the pressure of the mixture according to the characteristics of the melting process. Device to feed a comburent gassy substance to a tuyère for an electric furnace, the device comprising at least a line to feed oxygen and at least a line to feed neutral gas, the two lines being connected downstream to a mixing device (13) with a high mixing capacity, arranged immediately upstream of the relative tuyère, each of the lines comprising at least means to modulate and/or stabilise the pressure of delivery.

L'invention concerne un procédé d'alimentation de tuyères dans un four à arc électrique, les tuyères comprenant un conduit central permettant de distribuer une substance gazeuse comburante et un conduit périphérique permettant de distribuer une substance gazeuse de refroidissement. Le procédé consiste à envoyer au conduit central un mélange comburant formé d'oxygène et de gaz neutre (N¿2?, Ar, etc.) dans des proportions définies, l'oxygène et le gaz neutre étant acheminés, pour chacune des tuyères, vers un mélangeur (13) doté d'une capacité de mélange élevée, la pression du gaz neutre étant au moins en mesure d'être régulée sur le conduit d'alimentation de manière à moduler la pression du mélange selon les caractéristiques du processus de fonte. L'invention concerne aussi un dispositif permettant d'acheminer une substance gazeuse comburante vers une tuyère pour un four à arc électrique, le dispositif comprenant au moins un conduit d'alimentation en oxygène et au moins un conduit d'alimentation en gaz neutre, les deux conduits étant reliés en aval à un mélangeur (13) doté d'une capacité de mélange élevée, disposé immédiatement en amont de chaque tuyère, chacun des conduits comprenant au moins un organe permettant de moduler et/ou de stabiliser la pression de distribution.

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