| 摘要 |
PROBLEM TO BE SOLVED: To prevent deviation in a combustion gas flow flowing in a combustion gas passage, and to increase a heat absorption amount in the combustion gas passage 7. SOLUTION: In a multitubular boiler, a portion connecting an annular lower part header 1 and a lower part header 2 by a multiplicity of water tubes 3 and surrounded by the water tubes is used as a combustion chamber 9, a space between the water tubes 3 and furnace tubes 4 is used as the combustion gas passage 7 by surrounding an outer side of a water tube row by the cylindrical furnace tubes 4, portions other than combustion gas passage inlets 5 provided in upper parts between the water tubes in intervals of adjacent water tubes 3 are blocked, and combustion gas passage outlets 6 discharging combustion exhaust gas are provided in lower parts of the furnace tubes 4. A space part 12 for combustion gas flowing with an enlarged passage cross section is provided in a lower part in the combustion gas passage 7, multiple stages of fins 11 for heat absorption are provided in portions facing the combustion gas passages 7 of the water tubes 3 in parts higher than the space parts 12 for combustion gas flowing, and the passage cross section of the space part for combustion gas flowing of a part lower than an installation part of the fins for heat absorption of an upper part is enlarged in the combustion gas passage. COPYRIGHT: (C)2009,JPO&INPIT
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