BURNER

摘要

PURPOSE:To increase the reduction effect of NOx in a low excess air ratio and improve the stability of flames by a method wherein a number of opposing flames colliding with the walls of a combustion chamber are formed and the flames are arranged respectively on different axes. CONSTITUTION:Flame holes 11 are facing each other through a combustion chamber 8 and a number of the holes 11 are arranged at a nearly fixed distance on the walls 9 of the combustion chamber and form flame arrays. Fuel supply passages 12 are arranged in groups between the walls 9 and branch pipes 13 and cooling passages 14 are formed between them. A number of flames 20 are formed in the chamber 8 and heat generated in these flames 20 heats the walls 9 and the passages 12. Heat is radiated from the walls 9 and the passages 12 to reduce the flame temp. and the quantity of NOx contained in exhaust gas. When the flow amount of fuel becomes small, the flames 20 do not collide with the walls 9 and gradually become short and are apt to enter the holes 11. At that time, the walls 9 and the passages 12 are cooled by cooling air 22. The flames 20 therefore advance toward the upstream part of the passages 12 and a back fire does not occur and the flames burn stably near the holes 11.