BURNER ELEMENT FOR SURFACE COMBUSTION

PURPOSE:To enable achievement of stable combustion even under a high area load, by a method wherein a main air-fuel mixture flow passage and a pilot air-fuel mixture flow passage, which are different in the sectional area of the flow passage, are arranged in juxtaposition with each other in an adjoining state to form an air-fuel mixture flow passage bundle having a given length, and the downstream end surfaces of the flow passages form a combustion surface. CONSTITUTION:The length of each of plural pipes 3 arranged in parallel to each other is selected to a value long enough to allow flow uniformization of mixture of air and fuel gas passing through the interior and prevention of reverse flow of flame due to production of an eddy current within a pipe A. flow passage formed about in a triangular shape in cross section is formed between the outer surfaces of the two adjoining pipes 3 and a flat plate 4 by means of the flat plates 4 situated in a state to surround and nip a pipe train. A main air-fuel mixture flow passage 1 having a high sectional area is formed on the interior side of the pipe, and a bundle of pilot- air-fuel mixture flow passages 2, each having a low sectional area, is formed between the pipes 3 and the flat plates 4. This constitution produces friction resistance in the flow passage forms the pilot air-fuel mixture flow passage, having a low velocity of flow, which adjoins to the main air-fuel mixture flow passage, forms a stable pilot flame, having a balance between a combustion speed and a velocity of gas flow, to the downstream end thereof, and stabilizes a main flame.