1982 Volume 22 Issue 4 Pages 243-252
In June, 1977, No. 6 Blast Furnace at Chiba Works of Kawasaki Steel Corporation, was blown in as the largest bell-less top equipped furnace in Japan. Although troubles, such as tuyere bending and burning-out attributable to inappropriate gas flow distribution, were encountered at the initial stage, the results of a series of operational experiments were conducive to improving the in furnace conditions. Especially, the tests designed to determine the optimum charging sequence for coke and ore produced the following achievements:
1) The CO gas utilization ratio (out of the top gas) improved to about 54%.
2) No tuyere burn-outs since April, 1979.
3) A considerable decrease in the thermal load on the furnace shell.
Furthermore, very low fuel rates followed these improvements: a monthly average of 418.4kg/mt-h•m in March, 1980; and a yearly average of 436.1kg/mt-hm•m for the one year period from April, 1979 to March, 1980.
