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Title: Fuel and oxygen addition for metal smelting or refining process

A furnace for smelting iron ore and/or refining molten iron is equipped with an overhead pneumatic lance, through which a center stream of particulate coal is ejected at high velocity into a slag layer. An annular stream of nitrogen or argon enshrouds the coal stream. Oxygen is simultaneously ejected in an annular stream encircling the inert gas stream. The interposition of the inert gas stream between the coal and oxygen streams prevents the volatile matter in the coal from combusting before it reaches the slag layer. Heat of combustion is thus more efficiently delivered to the slag, where it is needed to sustain the desired reactions occurring there. A second stream of lower velocity oxygen can be delivered through an outermost annulus to react with carbon monoxide gas rising from slag layer, thereby adding still more heat to the furnace. 7 figs.
Inventors:
Issue Date:
OSTI Identifier:
7120845
Assignee:
Steel Technology Corp., Washington, DC (United States) PTO; EDB-94-164076
Patent Number(s):
US 5366537; A
Application Number:
PPN: US 8-000722
Contract Number:
FC07-89ID12847
Resource Relation:
Patent File Date: 5 Jan 1993
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; COAL; COMBUSTION; SMELTERS; FUEL FEEDING SYSTEMS; OXYGEN ENRICHMENT; COMBUSTION HEAT; IRON ORES; PULVERIZED FUELS; SMELTING; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; ENERGY; ENERGY SOURCES; ENRICHMENT; ENTHALPY; FOSSIL FUELS; FUEL SYSTEMS; FUELS; HEAT; MATERIALS; ORES; OXIDATION; PHYSICAL PROPERTIES; REACTION HEAT; THERMOCHEMICAL PROCESSES; THERMODYNAMIC PROPERTIES; 014000* - Coal, Lignite, & Peat- Combustion; 320301 - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Energy Sources