OPERATING METHOD FOR BLAST FURNACE

• Main Authors: YAMAOKA YOJIRO, TAKEBE TAKASHI, IZUMI MASARO
• Format: Patent
• Language: English
• Published: 22.12.1986
• Subjects: CHEMISTRY; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON

PURPOSE:To freely control the level of the remaining pig and the temp. and compsn. of the molten iron for each of plural tap holes by providing heat-resistant hot air control valves respectively to the branch pipes of the plural tuyeres of a blast furnace and controlling the rates of the high-temp. hot air the control valves. CONSTITUTION:The hot air conditioned to 900-1300 deg.C and 7-50g/Nm moisture is blown from the many tuyeres into the blast furnace 1. The hot air control valves 8 made of ceramics having heat resistance are provided to the branch pipes 7 of the many tuyeres 6. The adequate remaining pig level at which the tuyeres 6 are not eroded is set from the in-furnace reaction model preliminarily determined from the raw materials to be charged into the blast furnace, air flow rate, etc. and is inputted to an arithmetic control device 12 which calculates the remaining pig level from the tapping rate and slag discharging rate for each of the tap holes 10 to control the remaining pig level at every tapping by controlling the hot air control valves of the tuyere branch pipes. The adequate molten pig temp. and components by the infurnace reaction model and the temp. and components of the molten iron at each tap hole are compared and the valves 8 are controlled to control the temp. and components of the molten iron from each tap hole to adequate values.