Patent ID: 6602317
Filing Date: 2003-08-05
Classification: B01J,C01B,C21B,C21C,C22B,F23C,Y02E,Y02P

Abstract:
An apparatus for controlling temperature uniformity of the burden in a furnace for direct reduction of iron oxides to a metallized iron product, comprising:a generally vertical shaft furnace having an upper charging end and a bottom discharge end; means for charging particulate iron oxide material to the upper end of said furnace to form a burden therein, and a means for removing metallized iron product from the bottom end of said furnace, whereby a continuous gravitational flow of said burden can be established through the furnace; a reacted gas outlet at the upper end of said furnace; a first hot reducing gas inlet means through which a hot reducing gas is injected into the burden, said hot reducing gas inlet means located between the upper end of said furnace and the bottom of said furnace, wherein said hot reducing gas is injected into the burden to reduce the burden to metallized iron; and a second hot reducing gas inlet means through which a hot reducing gas is injected into a vertical centerline of the furnace to offset a cooling effect of upflowing gases, said second reducing inlet means intermediate to said first reducing inlet means and said bottom of said furnace.