FUEL COMBUSTION BURNER AND METHOD

PROBLEM TO BE SOLVED: To provide a long flame nozzle for reducing discharge of nitrogen oxides, by minimizing storage of carbon of a fuel nozzle, by reducing nonuniformity of a flow of fuel and an oxidizing agent. SOLUTION: This burner 10 includes a fuel conduit and an oxidizing agent conduit. The fuel conduit has an inlet section 16, a passing section 18 and an outlet section 20. The oxidizing agent conduit has an inlet section and an outlet section 30. The flowing cross-sectional area of a fuel passing section 18 changes up to the separate flowing cross-sectional area in a fuel outlet 22 from the first flowing cross-sectional area in a fuel inlet 14, and the flowing cross-sectional area of a fuel outlet section 20 is substantially uniform. At least a part of an oxidizing agent inlet section is substantially positioned at an interval around the whole of at least a part of at least one of the inlet section 16, the passing section 18 and the outlet section 20. The flowing cross-sectional area of an oxidizing agent outlet section is substantially uniform so as to become less than the flowing cross-sectional area of the oxidizing agent inlet section or equal to its area. COPYRIGHT: (C)2009,JPO&INPIT