1980 Volume 66 Issue 13 Pages 1956-1965
A large blast furnace of Kawasaki Steel Corporation, No. 6 furnace at Chiba Works, was blown in as the largest bell-less top equipped furnace in Japan in June, 1977. At the initial stage after the blowing-in the operators experienced such troubles as tuyere bending and burning-out which were attributed to inappropriate gas flow distribution in the furnace. However, a series of operational experiments made it possible to improve the internal furnace condition. Especially the trials to find out the better charging sequence for coke and are burdening have brought about the followings :
i) CO gas utilization ratio in the top gas has been improved up to about 54 per cent.
ii) There has been no tuyere burning-out since April, 1979.
iii) The thermal load on the furnace shell has considerably decreased.
Those improvements were followed by very low fuel rate records :
418.4 kg/t-p as a monthly averaged value in March, 1980 and 436.1 kg/t-p as a yearly avearged value for the period between April, 1979 and March, 1980.
