Abstract
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.
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