METHOD AND APPARATUS FOR TREATING EXHAUST GAS

PROBLEM TO BE SOLVED: To remove dioxins highly and economically from an exhaust gas of a melting furnace for melting scraps. SOLUTION: A rotary kiln type preheating furnace 2, having a burner for burning a combustible component in the exhaust gas is provided in an upper part of the melting furnace 1...

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Bibliographische Detailangaben
Hauptverfasser:	IRITA TOSHIYUKI, EBA ATSUSHI, KITAGUCHI HISATSUGU, YAMASHITA KOSUKE
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COMBUSTION APPARATUS COMBUSTION PROCESSES CONSUMING WASTE PRODUCTS BY COMBUSTION CREMATION FURNACES 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 GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING KILNS LIGHTING MECHANICAL ENGINEERING METALLURGY OVENS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS RETORTS SEPARATION TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To remove dioxins highly and economically from an exhaust gas of a melting furnace for melting scraps. SOLUTION: A rotary kiln type preheating furnace 2, having a burner for burning a combustible component in the exhaust gas is provided in an upper part of the melting furnace 1 for melting the scraps, and a wet dust collector 3 having the functions of water-cooling and dust removal of the exhaust gas, is provided directly behind the rotary kiln type preheating furnace 2. In the rotary kiln type preheating furnace 2, the scraps prior to being charged to the melting furnace is heated to 800 deg.C or higher, the oxygen concentration in the exhaust gas at an exhaust gas outlet of the rotary kiln type preheating furnace 2 is controlled to be not higher than 1%, and the temperature of the exhaust gas at an inlet of the wet type dust collector 3 is controlled at 400 deg.C or higher by controlling the combustion of the burner.