PRE-REDUCTION FURNACE IN SMELTING REDUCTION DEVICE FOR IRON ORE

PURPOSE:To effectively prevent sticking and growth of dust to the inside of a nozzle hole by connecting a metal cylinder constituting a nozzle hole embedded in a dispersing plate main body for forming a fluidized bed with a water cooling pipe and executing cooling while making the gas flow in a wall. CONSTITUTION:In a pre-reduction furnace in a smelting reduction device for iron ore, the exhaust gas from a smelting reduction furnace introduced into a gas injecting chamber 15 at lower part segmented into an upper part and a lower part with the dispersing plate 5 is introduced into the pre-reduction chamber 14 at upper part through the nozzle hole 7, and the fluidized bed is formed on the dispersing plate 5 to execute the pre-reduction to the iron ore. The above-mentioned nozzle hole 7 is constituted of the closed double pipe structural metal cylinder 8 embedded in the refractory-made dispersing plate body 6. In the dispersing plate body 6, further, a gas supplying pipe 9 and the metal-made water cooling pipe 10 are set. The cooling gas of N2, etc., is supplied in the double pipe structural inner part from this gas supplying pipe 9 through a branching pipe 11. Further, the water cooling pipe 10 and the metal cylinder 8 are connected through connecting members 12. By this method, the metal cylinder 8 is cooled and the sticking and the growth of dust are prevented so as not to clog the nozzle hole 7.