FLUE GAS RECIRCULATION TYPE TWO STORY IRON ORE SINTERING METHOD AND FLUE GAS RECIRCULATION TYPE TWO STORY IRON ORE SINTERING APPARATUS

摘要

PURPOSE: Flue gas recirculation type two story iron ore sintering method and apparatus are provided to reduce amount of pollutants discharged into the air and improve quality and productivity of sintered ore by using sintering flue gas circulation system and two story sintering method. CONSTITUTION: In a two-story iron ore sintering apparatus comprising a sintering car(7) for transferring two sintering layers(8,8a) vertically stacked after sintering raw materials are supplied from two hoppers(2,2a) continuously positioned in front and rear, a plurality of wind boxes(9) positioned under the sintering car to suck in air required for sintering reaction, and a main blowing pipe for blowing flue gas sucked in after sintering reaction into dust collector(11) through the wind boxes, the flue gas recirculation type two story iron ore sintering apparatus is characterized in that a wind box switch(56) is installed at a position corresponding to a part at which only the lower sintering layer(8) in the two sintering layers exists in the main blowing pipe; first injection pipe(52) at which first circulation means(12b) is installed is connected to a front part of the main blowing pipe prior to the wind box switch, wherein the first circulation means circulates flue gas passing through dust collector(11a) after being sucked in from wind boxes prior to the wind box switch; a hood(59) formed in such a way that the hood encircles the upper sintering layer is connected to one side of the first injection pipe; and a rear part of main blowing pipe(1c) is connected to an injection pipe(53) to which circulation means(12a) for recirculating flue gas into sintering car after the reference position is connected in such a way that flue gas is communicated between the rear part of main blowing pipe and the injection pipe, wherein the rear part of main blowing pipe is connected to some wind boxes just prior to a reference position corresponding to a point where the sintering car is contacted with a flame behind plane inside the lower sintering layer.