| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the exhausting of dust fine powder, etc., from the inner part of a furnace as much as possible while using the inner part of a shaft as the dust catcher by forming an iron ore raw material layer and a coke layer at the part upper than tuyeres at the lower part of the furnace, developing a hollow part in the inner part of the shaft, fusing the iron ore raw material at high temp. and setting the tuyere level to multi-stages. SOLUTION: At the time of blowing the to blast from tens of the tuyeres 7 (e.g. each six positions at the upper, middle and lower stages) opened on the furnace wall, the inner part of the furnace is formed so that the heat fully spreads through raceways 8. The blown hot blast passes through the raw material iron ore layer and the coke layer, and the iron ore is reduced and melted pig iron is discharged from the lower part and slag is discharged to the outer part, too). In the upper part of the furnace, since the large hollow part 25 is developed at the upper part of the furnace and the number of stages of the iron ore layers and the coke layers is small, such as about few stages, speed of combustion gas becomes about 1/3-1/10 of the conventional speed, and the dust is not blown up to the outside of the furnace, but floated and circulated, and deposited to the raw material layer at the lower part. In this way, the development of the dust is restrained and various dusts are treated and recycled.</p> |
