Patent GB-623781-A (GB)
Title: Improvements in or relating to liquid fuel burners
IPC: F23C99/00
Filed: 1947-02-19
Abstract: 623,781. Vapour burners. RANSFORD, A. J. (Lorenzen, W. H. H.). Feb. 19, 1947,. No. 4902. [Class 75(i)] In a liquid fuel burner of the type having a vaporizer heated by the burner flame the mixing channel opens into a combustion chamber and is provided with a heating jacket the interior of which communicates with the combustion chamber. A cylindrical gasifying chamber 8 is supported above a refractory lined combustion chamber 5 opening into a boiler furnace and a circular aperture 7 in the ceiling of the combustion chamber receives with a clearance the bottom of the gasifying chamber. An annular mixing pan 10 the inner wall 11 of which forms a continuation of the gasifying chamber 5 is supported by a cylindrical housing member 12 and the space between the outer wall of the annular pan and the housing member communicates with the aperture 7 in the combustion chamber 5. Hot gases enter this space and escape to the atmosphere through vents 35 in the housing member 12. Liquid fuel is supplied to the gasifying chamber by a pipe 21 and the vaporized fuel passes into the annular pan 10 through an aperture 19 in the inner wall 11 thereof. The lower edge of the aperture 19 is slightly below the level of the bottom of the annular pan. Carbon deposit in the aperture 19 can be removed by means of a rod which slides in a bore in the outer wall of the annular pan. Air from a blower enters the annular pan at a point radially opposite the aperture 19 but at a higher level. A transverse wall in the annular pan guides the annular channel of the pan into a semi-circularly bent heat-insulated tube 17 which connects with the combustion chamber 5. The cross section of the tube 17 increases toward the combustion chamber and a wire gauze 18 is disposed at the entrance to the combustion chamber. The annular pan 10 and the gasifying chamber 5 are closed by a single cover 13 or separate covers may be used. Fig. 5 shows the fuel and air supply systems. A main pipe 21 delivering fuel from a pump 24 to the gasifying chamber has a branch line 25 returning surplus fuel to the fuel tank. A spring loaded non-return valve 26 in the branch line imposes a pressure sufficient to raise the fuel to the upper end of the main pipe 21. The fuel supply to the gasifying chamber is regulated by a valve 27 which is automatically operated by a thermostat 30 mounted on the boiler being heated. The fuel valve 27 is mechanically connected to a damper 28 in an air supply pipe 20 connecting a blower 22 with the mixing chamber so that under normal operation of the blower 22 and pump 24 an adequate mixture of fuel and air is obtained at all settings of the fuel valve 27. A trimming damper 33 adjusted by means of a screw 34 is disposed in the air supply pipe 20. To start the burner, fuel in a small receptacle 41 situated belowan aperture 42 (Fig. 1) in the combustion chamber 5 is ignited, the oil to the receptacle being supplied by a branch fuel pipe 43 including a closable valve 44 and air being supplied by a branch air pipe 45 having a manually operated damper 46. Alternatively the gasifying chamber may be initially heated by a gas burner or an electric heating member.