Lance for fuel and oxygen injection into smelting or refining fu

Details Lance for fuel and oxygen injection into smelting or refining fu Lance for fuel and oxygen injection into smelting or refining fu

1993-11-12

1994-12-20

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75508, 75544, 75548, 75550, 266217, 266225, C22B 1500, C21C 532

Patent

active

053742974

ABSTRACT:
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.

REFERENCES:
patent: 2991173 (1961-07-01), Trentini
patent: 3615356 (1971-10-01), Grenfell
patent: 3653877 (1972-04-01), Enya
patent: 3832161 (1974-08-01), Leroy
patent: 3844768 (1974-10-01), Leroy
patent: 4434005 (1984-02-01), Metz et al.
patent: 4533124 (1985-08-01), Mercatoris

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