Two-chamber burner and process

Claim 1

A BURNER COMPRISING IN COMBINATION: (A) A BURNER HOUSING OF GENERALLY CYLINDRICAL, ELONGATED CONFIGURATION; (B) A HOLLOW, ELONGATED REFRACTORY BOOSTER BURNER BODY FIXED IN THE UPSTREAM END OF SAID HOUSING COAXIAL THEREWITH AND FORMING AN AXIAL BOOSTER BURNER COMBUSTION CHAMBER AND A SURROUNDING AIR HEATING ANNULUS WITH SAID HOUSING, SAID CHAMBER HAVING A RESTRICTED OUTLET ON ITS DOWNSTREAM END AND A BURNER IN THE UPSTREAM END THEREOF; (C) MEANS FOR FEEDING A COMBUSTIBLE MIXTURE OF FUEL GAS AND AIR TO THE BURNER OF (B) AND MEANS FOR IGNITING SAME; (D) MEANS FOR FEEDING PRIMARY AIR TO SAID HEATING ANNULUS; (E) AN ELONGATED HOLLOW REFRACTORY PRIMARY BURNER BODY COAXIAL WITH SAID HOUSING IN THE DOWNSTREAM END THEREOF SPACED FROM THE BURNER BODY OF (B) TO PROVIDE A SUBSTANTIAL FREE GAS SPACE THEREBETWEEN AND FORMING AN AXIAL PRIMARY COMBUSTION CHAMBER; (F) A HOLLOW FUEL RING IN THE GAS SPACE OF (E) COAXIAL WITH SAID HOUSING HAVING ORIFICES THEREIN DIRECTED IN A CONICAL PATTERN DOWNSTREAM INTO THE PRIMARY COMBUSTION CHAMBER OF (E), SAID FREE GAS SPACE COMMUNICATING BETWEEN THE ANNULUS OF (B) AND SAID PRIMARY COMBUSTION CHAMBER TO PROVIDE FOR FLOW OF HEATED COMBUSTION AIR FROM SAID ANNULUS TO SAID PRIMARY COMBUSTION CHAMBER; AND (G) MEANS FOR FEEDING FLUID FUEL TO THE FUEL RING OF (F).