JPS6428406A - Burner - Google Patents

Abstract

PURPOSE:To improve flame stability and to achieve the generation of NOx on a low level by a method wherein burner ports are located at the outlets of air-fuel mixture feed passages connecting a combustion chamber to an air-fuel mixture branch pipe and the burner ports provided on the combustion chamber wall are arranged sparsely in the central part of said chamber and closely in the periphery thereof. CONSTITUTION:After an electric current flows to sheath heaters 12 and a vaporization cylinder 11 is heated, a liquid fuel 15 is ejected from a fuel ejection nozzle 14. After the liquid fuel 15 is vaporized in the vaporization cylinder 11 and mixed with air 16 which is simultaneously blown thereinto, the liquid fuel 15 passes through a throat 9 and is turned into a uniform air-fuel mixture 17. The air-fuel mixture 17 passes through an air-fuel mixture branch pipe 6 and is fed into a combustion chamber 4 from the outlets of burner ports 5 through a plurality of air-fuel mixture feed passages 7. After having been ignited, the air-fuel mixture forms counter flames 18 and becomes exhaust gas 19 to be discharged through an exhaust port 20. On the other band, cooling air 21 passes through the outside of the air-fuel mixture feed passages 7 provided in a cooling air path 8. The counter flames 18 thus formed stagnate at the flame impingement portions in the combustion chamber 4 to slow the flow speed, so that the flames can be stabilized. Further, by dispersing the counter flames 18 and facilitating heat radiation from the combustion chamber 4 and the air-fuel mixture feed passages 7, the generation of NOx can be reduced to a low level.