GB521270A - Improvements in and relating to heat radiating combustion tubes for furnaces - Google Patents

Abstract

521,270. Lighting burners. HEPBURN, W. M. Nov. 10, 1938, No. 32723. Convention date, Nov. 11, 1937. [Class 75 (iii)] [Also in Group XII] Heat radiating combustion tubes for furnaces have burners arranged at the intake ends, fans for exhausting the combustion products from the discharge ends and heat exchange devices between the fans and discharge ends for cooling the exhaust gases. Figs. 1 and 4 show one form of radiator tube 12 of hair pin shape supported in the furnace wall 10 provided with a burner A at the intake end and a fan 17 for exhausting the gases which pass through a gilled pipe 18 arranged in a casing 29 through which gas passes to the burner A. As shown in Fig. 4, gas entering by the pipe 15 and through the tube 13 mixes with air entering the mouth 12<SP>1</SP> of the tube 12. An igniting mixture of gas and air enters the pipe 19 surrounding the tube 13 from a pipe 20. A sleeve 24 is arranged within the tube 12 to provide a constricted combustion zone. Unburnt fuel issuing from the sleeve slowly diffuses into the air flowing through the annular passage 26 thereby lengthening the zone of combustion. Fig. 7 shows a modification in which air enters the radiator tube 111 from the pipe 117 and mixes with gas supplied from an annular passage 119 and through pipes 118 to the inlet end of the radiator tube. An igniting tube 124 communicates with a chamber 125 into which a burner 126 fires tangentially, atmospheric air being admitted to this chamber through an opening 127.