| 摘要 |
PURPOSE:To inhibit the damage of a furnace wall at the inner furnace wall part in a transferring zone extending from the lower end of an upper small-diameter side wall part to a lower large-diameter side wall part, by forming the stream of steam along the inner wall surface at the lower end of the upper small-diameter side wall part of its lower vicinity inside a melting-gasifying furnace. CONSTITUTION:In the melting-gasifying furnace 10 comprising an upper small-diameter side wall part 11, a lower large-diameter side wall part 12 and an inclined middle side wall part 13, reduced iron 17 and coke 18 through a charging opening 19, solid fuel 28 and a slag-forming agent 29 through a middle charging opening 31, and oxygen 21 and fuel 22 through tuyeres 23 are charged, respectively, while reductive recovered gas 27 through a gas-withdrawing opening 20, and pig iron 26 and steel slag 24 through an opening 26 for discharging pig iron and slag are withdrawn, respectively. In the interior of said furnace, a heating zone a, a melting zone b, a combistion chamber c, a molten slag layer d, a basin e and a middle layer f packed with charged matter are formed. An opening 32 for injecting steam is provided at said middle side wall part 13, and steam is injected through it along the inner wall surface to inhibit the rising of the temp. of the inner wall part 33 in the transferring zone or the inner wall in its vicinity. Hence, the erosion or damage of the furnace wall is alleviated. |
