| 摘要 |
A package water tube boiler (10) has offset upper (22) and lower (20) steam and water drums located adjacent its opposite side walls (12, 14), with a generally square combustion chamber (36) between the drums. Connecting the drums are generally L-shaped riser and downcomer tubes including convection tubes (28) and radiant tubes (24) extending in vertical and horizontal runs along the sides, top and bottom of the combustion chamber. The tubes, especially the inboard radiant tubes (24), are configured, and their entrances and exits to and from the drums are located, so as to permit increased efficiency and steam generation capacity without increasing the package boiler's outside dimensions, to shield the drums from thermal radiation emanating from the combustion chamber, to locate the boiler's center of gravity equivalent from its side walls, and to fix the upper drum to and support it by the boiler's end walls.
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