Patent ID: 7874157
Filing Date: 2011-01-25
Classification: F23D,F23R,Y02E

Abstract:
1. A low emission combustor, comprising: a combustor housing defining a combustion chamber; a secondary nozzle disposed along a center line of the combustion chamber and configured to inject air or a first mixture of air and fuel to a downstream side of the combustion chamber; wherein the secondary nozzle comprises: an air inlet configured to introduce a first fluid comprising air, a diluent, or combinations thereof into the secondary nozzle; at least one fuel plenum configured to introduce a second fluid comprising a fuel, another diluent, or combinations thereof into the secondary nozzle and over a predetermined profile disposed proximate to the fuel plenum, wherein the predetermined profile is configured to facilitate attachment of the second fluid to the profile to form a fluid boundary layer and to entrain the incoming first fluid through the fluid boundary layer to promote premixing of the first fluid and the second fluid to produce a first fluid mixture; a plurality of primary nozzles disposed proximate to an upstream side of the combustion chamber and located around the secondary nozzle and configured to inject air or a second mixture of air and fuel to an upstream side of the combustion chamber; wherein an amount of first fluid mixture is less than the second mixture of air and fuel wherein the plurality of primary nozzles comprises a plurality of coanda nozzles.