| 摘要 |
PURPOSE:To achieve less variance in the quality of molten iron, stable furnace conditions and less time since tappint till slag off in a blast furnace provided with >=2 tap holes, by eliminating the temp. difference in the molten iron between the tap holes. CONSTITUTION:Tuyere end temps. are determined by the heat balance in tuyere parts; for example, the molten iron temps. from respective tap holes are made always constant by changing the blowing rate of heavy oil whereby the operations of a blast furnace can be continued stably. With a blast furnace wherein the Nos. 2, 3 THs on the 2nd, 1st hearth side of tap holes Nos. 1-3 THs are usually used alternately in tapping, the No. 1 TH is used as a spare and its tuyeres are divided appriximately equally to Nos. 1-27. In case the molten iron temp. of the No. 2 TH is slightly higher between the Nos. 2 and 3 THs in the stage of operation, 27 pieces of the tuyeres are quadrisected to the No. 1 near the latter, the tuyere group of the Nos. 21-27, the tuyere group of the Nos. 9-15 near the former, and the other goup. The rate of the heavy oil to be blown is changed to a slight decrease, a slight increase and absence of the increase or decrease in order of these groups, whereby the differences in said molten iron temps. are eliminated. |
