US 5,273,002 AGranted

Water tube boiler

AssigneeGadelius Sunrod AB

InventorsEndre Balint, Erik Andersson

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Abstract

A water tube boiler comprises a furnace having a burner and a vertical flue gas stack located to one side of the furnace. A convection tube assembly is arranged in the stack 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 the convection tube assembly, the tube assembly comprises by a plurality of parallel rows of vertical convection tubes which are provided externally with surface enlarging elements e.g. in the form of pins, along part of the height of each tube. The tubes in each row are joined together to form a coherent flat unit with the aid of a respective upper, horizontal header to which all convection tubes in the row are connected at their upper ends, and a respective lower horizontal manifold to which the bottom ends of the tubes in the row are connected. The headers of the various units are connected individually to a steam drum of the boiler and their manifolds are connected individually to a stuff box in the boiler. The heights of the headers and manifolds for adjacent flat tube units across the stack respectively alternate in height vertically.

Claims15

Dependent claims

A water tube boiler comprising

a furnace having a burner for generating a flame in the furnace, lateral sides around the furnace, a substantially vertical, flue gas stack located close to one of the sides of the furnace;
an inlet to the stack from the furnace for flue gases, the inlet located in the lower part of the furnace and the lower part of the stack;
an outlet for flue gases located at the upper part of the stack;
a convection tube assembly is arranged in and extending vertically in the stack for recovering heat from the flue gases passing through the stack, the convection tube assembly comprising a plurality of parallel rows of substantially vertical convection tubes, the tubes extending along a substantial portion of the height of the stack;
the respective tubes in each row being joined together to form a flat coherent unit, a respective upper, substantially horizontal header for each row of tubes and the header being connected at the upper ends of the tubes in the row, a respective lower and substantially horizontal manifold to which the lower ends of the tubes are connected;
a steam drum of the boiler to which the headers of the units are connected;
a stuff box in the boiler to which the manifolds of the units are connected;
and
surface enlarging elements provided on the exteriors of the tubes along at least a portion of the height of the tubes in the stack.

6 more elements

Dependencies are inferred from the claim text.