DISPOSITIF POUR CHAUFFER UN FOUR INDUSTRIEL

摘要

A burner housing lodged in a furnace wall comprises a nest of coaxial tubes including an inner gas-supply tube terminating in a burner head, an intermediate air-supply tube extending past that head to form a combustion chamber, and an outer tube defining with the intermediate tube a return duct for combustion gases. The metallic intermediate tube is provided with thermally conductive vanes facilitating the preheating of the entering combustion air by the high-temperature exhaust gases whose residual heat is then utilized to preheat the incoming fuel gas in a heat exchanger laterally connected with the outer tube. An ancillary burner at the opposite end of the inner tube directs a pilot flame toward the burner head.