METHOD FOR OPERATING A BLAST FURNACE

摘要

A method for operating a blast furnace (1), comprising the steps: charging iron ores (2) and cokes (3) through a furance top into the blast furnace; blowing in gas containing 40vol.% or more oxygen together with pulverized coal through tuyeres (4) 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: $iron,\; where\; X\; represents\; a\; fuel\; ratio.\; Through\; blown-in\; (11)\; inlets\; set\; in\; the\; furnace\; shaft,\; preheating\; gas\; (10)\; is\; blown\; in\; to\; preheat\; burndens.\; Cokes\; to\; be\; charged\; into\; the\; blast\; furnace\; is\; cokes\; of\; low\; strength\; having\; drum\; index\; of\; DI\; @@\; of\; 80\; to\; 90\%.$