METHOD AND DEVICE FOR ANNEALING OF METAL

摘要

PURPOSE:To reduce energy consumption of an annealing furnace by mixing fuel with the gas formed by combustion from the annealing furnace, burning the gas together with the gas formed by combustion and supplies separately in a combustion furnace and utilizing the combustion gas for an atmosphere gas. CONSTITUTION:The gas discharged from a heating pipe C of an annealing furnace A is gathered by a fan 3 and is conducted into a combustion chamber 1. The fuel is fed through a pipe 5 into the chamber 1 via control valves 11, 12 in accordance with the amt. of said waste gas and the concn. of oxygen and is mixed with said gas by an impeller 6. The gaseous mixture thus formed and the gas formed by combustion and fed through an air pipe 8 and a combustion pipe 9 are mixed and are burned. The combustion gas is passed through a heat exchanger E, by which heat is recovered. The gas is then passed through a cooler E' and is removed of moisture in a dehumidifier F. The gas is further passed through the exchanger E and is blown into the furnace A so as to be utilized as the atmospheric gas. The fuel consumption for the purpose of forming the atmospheric gas is reduced by such method.