ROTARY HEARTH FURNACE EXHAUST GAS DUCT APPARATUS AND METHOD FOR OPERATING SAME

The purpose of the present invention is to provide a rotary hearth furnace exhaust gas duct apparatus which produces reduced iron or granular metal iron by heating a raw material containing a carbonaceous reduction material and an iron oxide-containing substance, which can collect dust while also av...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	TOKUDA, KOJI, TSUGE, OSAMU, MIZUTANI, NORIAKI
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BLASTING CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE FERROUS OR NON-FERROUS ALLOYS FURNACES FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING KILNS LIGHTING MANUFACTURE OF IRON OR STEEL MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON OPEN SINTERING OR LIKE APPARATUS OVENS PRETREATMENT OF RAW MATERIALS PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL PRODUCTION AND REFINING OF METALS RETORTS 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 TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	The purpose of the present invention is to provide a rotary hearth furnace exhaust gas duct apparatus which produces reduced iron or granular metal iron by heating a raw material containing a carbonaceous reduction material and an iron oxide-containing substance, which can collect dust while also avoiding problems that accompany increases in exhaust gas amount and temperature, and which also can stably operate for a long period of time at a high thermal efficiency, and to provide a method for operating the rotary hearth furnace exhaust gas duct apparatus. A cooling unit (12) for solidifying metal salt in exhaust gas discharged from a rotary hearth furnace by cooling the exhaust gas, a collision unit (13) for colliding the exhaust gas immediately after cooling to cause the solidified metal salt to fall, and a direction conversion duct (14) for leading the collided exhaust gas in a direction other than the direction in which the metal salt fell are disposed in two stages in the aforementioned order in a rotary hearth furnace exhaust gas duct (8) in the rotary hearth furnace exhaust gas duct apparatus (11) according to the present invention.