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US 5,572,544 AGranted
Electric arc furnace post combustion method
AssigneePraxair Technology, Inc.
InventorsPravin C. Mathur, Zhiyou Du, Ronald J. Selines
Life of this patent
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Abstract
A method for carrying out post combustion in an electric arc furnace comprising forming a preferential gas stream within the electric arc furnace, concentrating carbon monoxide within the gas stream, and providing post combustion oxygen into the gas stream where the carbon monoxide is concentrated.
Claims11
A method for carrying out post combustion in an electric arc furnace having at least one electrode and an exhaust port comprising:
- (A) forming a molten metal bath comprising molten metal and carbon within the electric arc furnace;
- (B) providing main oxygen into the molten metal through the upper portion of the molten metal bath and not providing any oxygen into the molten metal through the bottom of the molten metal bath, and reacting main oxygen with carbon within the molten metal to generate carbon monoxide within the furnace to provide heat to the furnace and to stir the bath;
- (C) forming a gas stream within the furnace from where the main oxygen is provided into the molten metal to the exhaust port and passing carbon monoxide generated within the furnace toward the exhaust port within said gas stream;
- (D) providing post combustion oxygen into the gas stream above the molten metal and close to the formation of the gas stream;
- and
- (E) reacting said post combustion oxygen with said carbon monoxide within said gas stream and forming carbon dioxide in an exothermic reaction within the electric arc furnace.
3 more elements
Dependencies are inferred from the claim text.