The term "carbon oxygen lance" primarily pertains to electric furnace smelting operations, encompassing both electric furnace door carbon oxygen lances and furnace wall carbon oxygen lances.
The furnace door carbon oxygen lance is typically outfitted with two water-cooled nozzles. These nozzles can be configured as either two separate water-cooled oxygen lances or a combined oxygen lance. In the case of the former setup, the two oxygen lances are arranged in a specific manner: one is a Laval supersonic oxygen lance, while the other is a carbon gun designed for spraying carbon powder through a straight hole, with the Laval nozzle positioned above the carbon gun.
During the smelting process, as the scrap material gradually melts, the spray gun located at the furnace door is incrementally inserted into the furnace.
When compared to traditional smelting processes, the utilization of carbon oxygen lances in electric furnaces offers several notable advantages:
Supersonic Oxygen Injection: The furnace door carbon oxygen lance is capable of injecting oxygen into the molten pool at a supersonic velocity, specifically at a Mach number of 2. This high-speed injection alters the chemical equilibrium within the molten pool, significantly increasing the quantity of carbon monoxide (CO) present.
Enhanced Foam Slag Smelting: The introduction of carbon injection via the carbon oxygen lance improves the conditions for the entire foam slag smelting process. This leads to reduced splashing, increased power utilization efficiency, decreased noise levels, and improved overall smelting quality.
Increased Flue Gas Temperature and Optimized Oxygen Utilization: The temperature of the flue gas rises, and the ample oxygen supply reacts effectively with the carbon. In contrast to traditional systems, free oxygen is utilized for CO combustion during the decarburization phase. Consequently, the oxidizing atmosphere within the furnace is weakened, resulting in reduced consumption of electrodes and refractory materials.
In summary, the adoption of carbon oxygen lances in electric furnace smelting operations presents a range of benefits that enhance efficiency, quality, and cost-effectiveness.
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