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At No. 3 blast furnace of K imitsll Works, a test operation was planned to obtain the lower limit of fuel rate (the target was 430 kg/t-Pig mainly by controlling the profile of sqftening-melting zone in the furnace. As a result of the operation, a new record of fue l rate of 431 kg/t-Pig was attained in March, 1975. Based on the results of the test operation, the technique to decrease fuel rate was investigated, and the lower limit of fu el rate to be attained in the next J 0 years wa s estimated by use of a mathematical model to be about 400 kg/t-Pig. This fuel rate is attained mainly by the improvement of raw material properties .

Synopsis:A new method by which the detection of the damages of blast furnace cooling system is easily made was developed. This is an acoustical method which detects the abnormal sounds caused by the entry of gas bubbles into cooling box or tuyere from the blast furnace through the small damaged part. The result of the application of this method to the actual blast furnace was found to be quite satisfactory.

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