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Title: Lance for fuel and oxygen injection into smelting or refining furnace

A furnace 10 for smelting iron ore and/or refining molten iron 20 is equipped with an overhead pneumatic lance 40, through which a center stream of particulate coal 53 is ejected at high velocity into a slag layer 30. An annular stream of nitrogen or argon 51 enshrouds the coal stream. Oxygen 52 is simultaneously ejected in an annular stream encircling the inert gas stream 51. 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 84 to react with carbon monoxide gas rising from slag layer 30, thereby adding still more heat to the furnace.
Inventors:
 [1]
  1. (Chesterton, IN)
Issue Date:
OSTI Identifier:
869654
Assignee:
Steel Technology Corporation (Washington, DC) IDO
Patent Number(s):
US 5374297
Contract Number:
FC07-89ID12847
Research Org:
American Iron and Steel Inst., Pittsburgh, PA (United States)
Country of Publication:
United States
Language:
English
Subject:
lance; fuel; oxygen; injection; smelting; refining; furnace; 10; iron; molten; 20; equipped; overhead; pneumatic; 40; center; stream; particulate; coal; 53; ejected; velocity; slag; layer; 30; annular; nitrogen; argon; 51; enshrouds; 52; simultaneously; encircling; inert; gas; interposition; streams; prevents; volatile; matter; combusting; reaches; heat; combustion; efficiently; delivered; sustain; desired; reactions; occurring; outermost; annulus; 84; react; carbon; monoxide; rising; adding; monoxide gas; volatile matter; carbon monoxide; gas stream; inert gas; particulate coal; slag layer; molten iron; coal stream; smelting iron; gas rising; refining molten; reactions occur; center stream; oxygen injection; oxygen stream; overhead pneumatic; oxide gas; pneumatic lance; /75/266/