COANDA PILOT NOZZLE FOR LOW EMISSION

摘要

PROBLEM TO BE SOLVED: To reduce NOx emission from a combustor without impairing the dynamics and operability of the combustor. SOLUTION: A secondary nozzle 28 is disposed along a center line 30 of a combustion chamber 17 to inject a first air-fuel mixture to the downstream side of the combustion chamber 17. The secondary nozzle 28 includes an air inlet adapted to introduce a first fluid to the secondary nozzle 28. One or more fuel plenums are adapted to introduce a second fluid over a predetermined profile disposed adjacently to the secondary nozzle 28 and the fuel plenums. The predetermined profile is adapted to form a fluid boundary layer by adhering the second fluid to the profile and also to promote premixing of the first fluid and the second fluid by entraining the first fluid flowing thereto through the fluid boundary layer to generate a first fluid air-fuel mixture. A plurality of primary nozzles 34 is located around the secondary nozzle 28 to inject a second air-fuel mixture to the upstream side of the combustion chamber 17. COPYRIGHT: (C)2010,JPO&INPIT