| 摘要 |
A vertical steam or hot water boiler includes a convection part enclosed in a drum, and has a final combustion chamber attached thereto. The convection part includes at least two groups of smoke tubes. An annular box structure encloses either, or both, of said groups, at the ends of the tubes adjacent to the final combustion chamber, and the box structure being provided with an inlet and an outlet for a boiler fluid. This fluid may be feed water or steam to be superheated.
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