OPERATION METHOD OF VERTICAL FURNACE

• Main Authors: TERUHIKO KOKUBUN, YASUSHI OBARA, NORIMITSU KONNO, KYOICHI ARAKI, YASUHIKO FUJIWARA, MASAAKI NAITO, TADASHI OBARA
• Format: Patent
• Language: English
• Published: 29.09.2006
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

A METHOD FOR OPERATING A SHAFT FURNACE WHICH COMPRISES CHARGING THE FURNACE WITH AN IRON SOURCE HAVING A LOW DEGREE OF METALLIZATION AND THUS REQUIRING REDUCTION, AN IRON SOURCE HAVING A HIGH DEGREE OF METALLIZATION AND THUS REQUIRING NOTHING BUT MELTING, AND A SOLID FUEL, AND BLOWING AN OXYGEN-CONTAINING GAS AT ORDINARY OR HIGHER TEMPERATURE UP TO 600 °C. INTO THE FURNACE THROUGH TUYERES (7) TO REDUCE AND MELT THE IRON SOURCES.THE OPTIMAL VALUES OF CO (GAS UTILIZATION FACTOR) ARE DETERMINED FROM THE AVERAGE DEGREE OF METALLIZATION OF THE IRON SOURCES, AND THE SHAFT FURNACE IS CONTROLLED SO THAT THE EFFLUENT GAS FROM THE FURNACE HAS THE OPTIMAL CO VALUES. THE CONTROL IS ACCOMPLISHED BY REGULATING THE HEIGHT OF THE CHARGE, REGULATING THE HEIGHT OF THE COKE BED (10), ETC., USING MULTISTAGE TUYERES (7), AND RADIALLY PARTITIONING THE CHARGE. THUS, THE IRON SOURCES CAN BE EFFICIENTLY REDUCED AND MELTED AT A LOW FUEL RATIO.(FIG 1 (A)