ROTARY HEARTH REDUCING FURNACE AND METHOD OF OPERATING THE SAME

PROBLEM TO BE SOLVED: To provide a method of combustion with a rotary hearth reducing furnace, in which the generation of nitrogen oxides in the rotary hearth reducing furnace is suppressed to thereby attain substantial reduction of an emission rate. SOLUTION: In this rotary hearth reducing furnace...

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1. Verfasser:	SHIMA SHINJI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS 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 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 OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method of combustion with a rotary hearth reducing furnace, in which the generation of nitrogen oxides in the rotary hearth reducing furnace is suppressed to thereby attain substantial reduction of an emission rate. SOLUTION: In this rotary hearth reducing furnace of countercurrent heating system adapted to charge a metal oxide and a reducing agent thereinto and carry out heating/reduction by burners provided in a heating combustion zone and a reducing combustion zone, regulation is made so that the reducing combustion zone of below 0.98 theoretical air ratio in a combustor occupies at least 15% of the overall combustion space and so that in the gas emission area of the furnace, the oxygen concentration of combustion emission gas is 5% or less. COPYRIGHT: (C)2008,JPO&INPIT