Patent ID: 8042497
Filing Date: 2011-10-25
Classification: F22B

Abstract:
1. A method of modifying a boiler flue of a boiler to provide an internal gas bypass arrangement, the boiler flue having parallel flow gas paths with superheater surface located in one gas flow path, reheater surface located in another gas flow path and outlet flow control dampers provided in the superheater and reheater gas flow paths, the boiler flue having a plurality of tube banks having multiple tube bank inlets and multiple tube bank outlets within the parallel gas flow paths within the boiler setting, comprising the steps of: removing tubes from at least one of the tube banks to create a void within the tube bank; installing a bypass flue within the boiler setting in the void from the inlet of the tube bank to the outlet of the tube bank for transporting flue gas there through; and installing a damper within the bypass flue for controlling a pre-selected portion of the flowing flue gas through the bypass flue.