| 摘要 |
<p>A water tube boiler comprises a hearth (11) and a vertical flue gas stack (12) located to one side of this with a convection tube assembly (31) arranged in the stack (12) for the recovery of heat from flue gases passing through the flue gas stack. With the object of facilitating any repair work needing to be performed on this convection tube assembly, it is formed by a plurality of parallel rows of vertical convection tubes (31) which are provided externally with surface enlarging elements (32), the tubes in each row being joined together to form a coherent flat unit with the aid of an upper, horizontal header (33) to which all convection tubes (31) in said row are connected by their upper ends, and a lower horizontal manifold (34), the headers (33) of the various units being connected individually to a steam dome (19) of the boiler (10) and their manifolds (34) being connected individually to a stuff box (16) in the boiler (10).</p> |
