Burner and method

Claim 1

In an industrial burner having means for delivering fuel into a combustion chamber having a wall, a system for intermixing air, fuel and recirculating gases within the combustion chamber to provide a flame having substantially uniform combustion gas profiles of velocity and temperature at the combustion chamber exit, the system comprising: a secondary air passage for the flow of secondary air surrounding the fuel delivering means and having an inner wall, an outer wall and means for dividing said secondary air passage into a plurality of separate flow passages to provide zones of relatively higher pressure secondary air flow forming along said dividing means adjacent relatively lower pressure secondary air flow within at least one of said flow passages; a flow attachment wall connected to the outer wall of said secondary air passage and extending divergingly into the combustion chamber away from the axial centerline of said combustion chamber; a secondary air chamber surrounding said secondary air passage at the entrance to said passage for providing secondary air to said secondary air passage in a direction non-parallel to the longitudinal axis of said secondary air passage and each said secondary air passage dividing means; a secondary air inlet means for supplying secondary air to said secondary air chamber; said secondary air chamber being connected between said inlet means and said secondary air passage; deflector means connected to the end of said secondary air passage inner wall downstream of said dividing means for promoting attachment of said secondary air flow along said flow attachment wall and for providing a boundary between regions of different pressures adjacent said deflector means in the combustion chamber to promote generation of vortexes by the interaction of the zones of high-pressure secondary air flow with the fuel and recirculating gases.