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US 6,146,442 AGranted
Apparatus and method for introducing gas into a shaft furnace without disturbing burden flow
AssigneeMidrex International B.V. Rotterdam, Zurich Branch
InventorDaniel J. Sanford
Life of this patent
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Abstract
An apparatus for the direct reduction of iron oxide utilizing a shaft furnace equipped with a bustle and tuyere system having multiple rows of tuyeres. The bustle and tuyere system utilizes multiple rows of tuyeres to aid in the reduction of gas velocities through the system and to improve burden flow.
Claims11
An apparatus for direct reduction of iron oxides to a metallized iron product, comprising:
- (a) a generally vertical shaft furnace;
- (b) a device to charge particulate iron oxide material to the upper portion of said furnace to form a burden therein, and a device to remove metallized iron product from the bottom of said furnace, whereby a continuous gravitational flow of said burden can be established through the furnace;
- (c) a reducing gas inlet system comprising a single bustle having multiple sets of tuyeres communicating with said bustle said tuyeres being aligned in multiple vertically-spaced rows around the circumference of the furnace through which a common reducing gas is injected into the burden, said reducing gas inlet system located intermediate to the ends of the furnace and arranged integrally within the wall of the shaft furnace;
- and
- (d) a reacted gas outlet at the upper end of said furnace.
2 more elements
A method for the direct reduction of iron oxides comprising the steps of:
- charging particulate iron oxide material to a generally vertical shaft furnace to form a burden therein;
- injecting a common reducing gas from a single bustle, through multiple sets of tuyeres and into said burden, said single bustle arranged integrally within the wall of the shaft furnace, said single bustle having multiple sets of tuyeres communicating with said bustle, said tuyeres being aligned in multiple vertically-spaced rows around the circumference of the furnace, and
- removing metallized iron product from the bottom of said furnace thereby establishing a continuous gravitational flow of said burden through said furnace.
Dependencies are inferred from the claim text.