METHOD FOR CONTROLLING AFTERBURN IN DIRECT-FLAME ANTI-OXIDATION HEATER, AND APPARATUS THEREFOR

• Main Author: KUNIKATA YASUO
• Format: Patent
• Language: English
• Published: 11.08.2005
• Edition: 7
• Subjects: CHEMISTRY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

PROBLEM TO BE SOLVED: To provide a controlling method for preheating a steel sheet while completely combusting flue gases in a preheating furnace for preheating the steel sheet, in a direct-flame anti-oxidation heater of a continuous annealing facility, and to provide an apparatus therefor. SOLUTION: This apparatus has the preheating furnace 3 arranged so as to adjoin the direct-flame anti-oxidation heater 2, into which the flue gases of the direct-flame anti-oxidation heater 2 are introduced, and a slit burner 4 arranged in a portion of connecting the preheating furnace 3 with the direct-flame anti-oxidation heater 2. The method for reliably combusting the flue gases includes feeding fuel and air to the slit burner 4, while controlling the amount of fuel to the minimally necessary amount for heating the unburned gases in the flue gases to the ignition temperatures, and the amount of air to the necessary amount for completely combusting the fuel and the unburned fuel gas. COPYRIGHT: (C)2005,JPO&NCIPI