RECOVERING METHOD FOR POTENTIAL HEAT OF BLAST FURNACE MOLTEN SLAG

摘要

PURPOSE:To recover the poetntial heat of molten slag efficiency in dry type by blowing air to the blast furnace molten slag while allowing the same to flow down to make red hot paticulate slag and gas-conveying the same to a fluid layer device to undergo solid-gas heat exchanging. CONSTITUTION:Blast furnace molten slag 1 is flowed down into a tundish 3 and flows in an induced air tunnel 5 by being blown by the air being flowed at an air flow of 500M3 or over per ton of the flowing slag from an air nozzle 4. The red hot particulate slag 1a having frozen by hitting against a baffle plate 6 is gas-conveyed in the state of maintaining temperatures of 500-1000 deg.C and is charged into a fluid layer device 19. This particulate slag 1c is flowed by the heat-exchanging gas being blown through a nozzle 22 and after passing through fluid plates 20a thru 20d, it is taken out as cold fine particles 1d through overflow discharge communicating pipe. This heat-exchanging gas goes into a gas-liquid heat exchanger 29 from the exhaust hole 25 via cyclone dust collector 27 to undergo heat exchanging with the medium, after which it is again blown into the fluid layer device 19. The medium having been heated is led to other heat-utilizing apparatus.