Patent ID: 8413595

Claim:
A furnace comprising an enclosure in which combustion takes place, and a nozzle for feeding a combustion-maintaining medium including air into the furnace, the nozzle comprising: a nozzle tip, at least partly protruding into the enclosure; and a feeding conduit arranged to direct a combustion-maintaining medium including air in a first direction into the nozzle tip, and through the nozzle tip into the furnace; the nozzle tip including a passage for the flow of combustion-maintaining medium through the nozzle tip into the furnace, said passage being bounded in part by at least one wall having an outer surface directly exposed to heat generated by combustion in the furnace, and an opposite, inner, surface directly exposed to, and cooled by air in the combustion-maintaining medium in said passage, said inner surface of said at least one wall being positioned at an angle relative to said first direction such that air directed by said feeding conduit into the nozzle tip impinges obliquely upon said inner surface; and said at least one wall of the nozzle tip having an array of openings each providing for the flow of air from said passage to the outer surface of said wall, whereby the temperature difference between said inner and outer surfaces is moderated.