| 摘要 |
PROBLEM TO BE SOLVED: To achieve further reduction of NOx, increase of efficiency, and miniaturization of a boiler having a substantially cylindrical can structure. SOLUTION: The boiler has an annular heat transfer section 4 having a circulation clearance 30 for communicating the inside with the outside, and a combustion apparatus 7 disposed at one opening edge of the axial direction of the annular heat transfer section 4. The annular heat transfer section 4 is disposed in flame jetted from the combustion apparatus 7. The interval between the combustion apparatus 7 and the annular heat transfer section 4 and the circulation clearance 30 are set so that the temperature of the flame jetted from the circulation clearance 30 is 800°C to 1,300°C. COPYRIGHT: (C)2004,JPO
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