| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiple tube type through flow boiler having construction permitting the vertical flow of combustion gas into a combustion gas passage provided between two inner and outer water tube rows while compatibly increasing a heat absorbing amount and preventing an pressure increase in a furnace. SOLUTION: In the multiple tube type through flow boiler with heat absorbing fins intersecting a combustion gas flow, an annular upper tube header 1 and an annular lower tube header 2 are provided at the upper part and at the lower part, respectively, the upper and lower tube headers are connected to each other with a number of water tubes 3, 4 in two inner and outer rows, a space between the adjacent water tubes in the water tube rows are closed excluding parts thereof, and the combustion gas passage 7 is provided between the inner water tube row and the outer water tube row for the vertical flow of the combustion gas in the combustion gas passage 7. The number of heat absorbing fins 11 intersecting a combustion gas flow are provided in portions of the inner water tube 3 and the outer water tube 4 facing the combustion gas passage 7. The installation start positions of the heat absorbing fins 11 in the inner water tube 3 are different from those in the outer water tube 4. COPYRIGHT: (C)2005,JPO&NCIPI
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