APPARATUS FOR IMPROVING AIR PERMEABILITY OF SINTERING LAYER

PURPOSE: An apparatus for improving air permeability of sintering layer is provided to substantially improve quality and productivity of sinter produced by mounting a puff pipe on the lower part of a backward inclined plate of a charging unit, and reduce pig iron manufacturing cost by increasing use amount of inexpensive limonite. CONSTITUTION: In an apparatus which sinters sintering raw materials using a sintering unit and comprises a sintering car(4) for transferring sintering raw material layer, an ignition furnace for igniting the surface of the sintering raw material layer at the upper part of the sintering car, and a gas exhaust part for exhausting flue gas generated during cooling of sinter into the atmosphere, the apparatus for improving air permeability of sintering layer comprises a hot blast supplier(20) for supplying 400 to 600 Nm¬3/hr of hot blast after converting the recovered sintering flue gas into hot blast of 200 to 300 deg.C by recovering some of sintering flue gas that is generated when cooling sinter before ignition for sinter manufacturing; and a four-stage aeration unit(10) which is positioned at the lower part of a backward inclined plate(3) that is installed at a Dwight Lloyd type sintering machine and connected to the hot blast supplier(20) so that the four-stage aeration unit(10) blows the hot blast supplied from the hot blast supplier(20) into the sintering raw material layer charged.