Lance for fuel and oxygen injection into smelting or refining furnace

Patent · Sat Jan 01 04:00:00 EST 1994

OSTI ID:869654

Schlichting, Mark R ^[1]

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1. Chesterton, IN

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.

• Research Organization: American Iron and Steel Inst., Pittsburgh, PA (United States)
• DOE Contract Number: FC07-89ID12847
• Assignee: Steel Technology Corporation (Washington, DC)
• Patent Number(s): US 5374297
• OSTI ID: 869654
• Country of Publication: United States
• Language: English

Related Subjects

/75/266/
10
20
30
40
51
52
53
84
adding
annular
annulus
argon
carbon
carbon monoxide
center
center stream
coal
coal stream
combusting
combustion
delivered
desired
efficiently
ejected
encircling
enshrouds
equipped
fuel
furnace
gas
gas rising
gas stream
heat
inert
inert gas
injection
interposition
iron
lance
layer
matter
molten
molten iron
monoxide
monoxide gas
nitrogen
occurring
outermost
overhead
overhead pneumatic
oxide gas
oxygen
oxygen injection
oxygen stream
particulate
particulate coal
pneumatic
pneumatic lance
prevents
reaches
react
reactions
reactions occur
refining
refining molten
rising
simultaneously
slag
slag layer
smelting
smelting iron
stream
streams
sustain
velocity
volatile
volatile matter