BOILER OR FURNACE FOR COMBUSTION OF FUEL IN AN AIR STAGED COMBUSTION MODE

摘要

The invention relates to a boiler or furnace (10) for combustion of fuel in an air staged combustion mode, comprising an enclosure (12) having walls (16) defining a combustion chamber (14), of which walls (16) at least a part is provided with heat exchanging tubes (18) for generating a heated fluid, at least one burner (22) for combustion of fuel positioned in one (20) of the walls (16) and provided with a fuel supply (26) and a primary air supply (24), and a secondary air supply (32), and an outlet (28) for discharge of flue gas, wherein the secondary air supply (32) is a manifold system comprising an inlet (38; 54) through the wall (20), in fluid communication with a distribution channels (46) positioned internally of the enclosure (12) and the heat exchanging tubes (18) downstream of the at least one burner (22) in a secondary combustion zone.