초록 ▼

A method for heating and/or melting a charge such as aluminum in a furnace using heat generated by combustion to radiatively heat the charge through a layer of protective gas wherein combustion reaction products generated by the combustion are exhausted from a lower level within the furnace, and, du

A method for heating and/or melting a charge such as aluminum in a furnace using heat generated by combustion to radiatively heat the charge through a layer of protective gas wherein combustion reaction products generated by the combustion are exhausted from a lower level within the furnace, and, during melting, the protective gas layer has a higher upper boundary than during a subsequent heating period, enabling reduced NO.sub.x generation, lower fuel and oxygen consumption and reduced refractory corrosion by avoiding furnace gas flow through the high temperature upper furnace region.

대표청구항 ▼

[ We claim:] [1.] A method for providing heat to a furnace charge contained in a furnace having a floor, comprising:(A) providing fuel and oxidant into a furnace and combusting the fuel and oxidant within the furnace generating heat and combustion reaction products and forming a combustion layer wit

[ We claim:] [1.] A method for providing heat to a furnace charge contained in a furnace having a floor, comprising:(A) providing fuel and oxidant into a furnace and combusting the fuel and oxidant within the furnace generating heat and combustion reaction products and forming a combustion layer within the furnace, at least one of said fuel and oxidant being provided into the furnace at a first vertical distance above the floor;(B) providing protective gas into the furnace at a second vertical distance above the floor, said second vertical distance being less than the first vertical distance, and forming a protective gas layer within the furnace between at least some of the furnace charge and the combustion layer;(C) radiating heat from the combustion layer through the protective layer and to the furnace charge; and(D) withdrawing the combustion reaction products from the furnace from below the first vertical distance.