Development of Oxygen Jet Burner in Electric Arc Furnace

Two Oxygen-fuel burners were applied to 80 ton electric arc furnace for making stainless steel at Wakayama Steel Works of Sumitomo Metal Industies Ltd. But the trouble was that adhesion of slag splashed on the burner tip lost enough efficiency of the burner. A new burner was developed to prevent adhesion of slag splashes on the burner tip and to shorten charge-tap time. In a conventional burner,fuel injected from the burner center and oxygen swirled by swirl impeller are ejected into the arc furnace. Above this, a new burner has a laval nozzle in the burner center in order to eject super high speed oxygen. The ratio of oxygen ejected from jet lance and oxygen swirled for combustion is controled according to the operation period. After melting period, flow rate of oxygen ejected from jet lance is reduced. Two conventional burners were replaced to the new burners, one by one. l) The result is as follows. Oxygen ejected from jet lance prevents adhesion of slag splashes on the burner tip. And charge-tap time was shortened by 10 minutes and electricity consumption was reduced 57 kwh par ton.