Title: Process for operating blast furnaces
Application Number: 87105969 Application Date: 1987.12.26
Publication Number: 1019683 Publication Date: 1988.07.20
Approval Pub. Date: 1990.08.22 Granted Pub. Date: 1990.08.22
International Classifi-cation: C21B5/00
Applicant(s) Name: Nippon Kokan K. K. Address:
Inventor(s) Name: Yotaro Ono
Attorney & Agent: LIU WENZHI
Abstract:
    A method for operating a blast furnace, comprising the steps: charging iron ores and cokes through a furance top into the blast furnace; blowing in gas containing 40vol.% or more oxygen together with pulverized coal through tuyeres into the blast furnace; and controlling a fuel ratio within a range of 500 to 930kg/ton., molten pig iron and still a ratio of the pulverized coal blown in through the tuyeres within a range satisfying the formula iron, where X represents a fuel ratio. Through blown-in inlets set in the furnace shaft, preheating gas is blown in to preheat burndens. Cokes to be charged into the blast furnace is cokes of low strength having drum index of DI of 80 to 90%.
Time: 5