Synopsis Nippon Steel Corporation began pulverized coal injection at No. 1 blast furnace (inner volume: 4 158 m3, top pressure: 2.5 x 104 kg/m2) at Oita Works in June, 1981. Since then, both the pulverized coal injection system and No. 1 BF have been working smoothly with no serious troubles. This report describes the development of application techniques of pulverized coal injection to a large blast furnace with high top pressure and high blast temperature, and introduces the results of operation at Oita No. 1 BF in comparison with those of oil injection and all-coke operations.
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