Patent ID: 7004086
Filing Date: 2006-02-28
Classification: F22B

Abstract:
1. A boiler comprising: a primary combustion zone having a downstream passage for flowing flue gases generated during combustion; a boiler nose forming with walls of the boiler a restriction in the downstream flue gas passage, said boiler nose having a plurality of ports for feeding overfire air into the flue gases flowing along the downstream passage; wherein said boiler walls define a generally vertically extending boiler enclosure confining the flue gas for flow in a generally upward vertical direction from said combustion zone, said boiler nose extending generally laterally across the downstream passage forming said restriction between said boiler nose and a wall of said boiler opposite said nose; wherein said nose includes a boiler wall portion inclined relative to the generally upward vertical flow direction of the flue gas, said ports being formed in said inclined wall portion; and wherein the wall portion is inclined upwardly away from said restriction.