Pilot cones for dry low-NO.sub.x combustors
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United States of America Patent
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-
Sep 26, 2000
Grant Date -
N/A
app pub date -
Jan 2, 1998
filing date -
Jan 2, 1998
priority date (Note) -
In Force
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Abstract
A gas turbine combustor is provided having a nozzle housing adjacent to a main combustion zone, a diffusion fuel pilot nozzle, at least one main nozzle extending through the nozzle housing and attached thereto, and a parabolic pilot cone projecting from the vicinity of an injection port of the pilot nozzle. The parabolic pilot cone has a diverged end adjacent to the main combustion zone, and a parabolic profile forming a pilot flame zone adjacent to the injection port and the diverged end. The increased volume of the pilot flame zone provide a more stable pilot flame. The more stable pilot flame and leaner fuel/air mixture reduce NO.sub.x /CO emissions. A second gas turbine combustor is provided having a fluted pilot cone. The fluted pilot cone has an undulated diverged end adjacent to the main combustion zone forming a pilot flame zone adjacent to the injection port and the undulated diverged end. The undulated diverged end of the fluted pilot cone creates turbulence in the main combustion zone. The turbulence results in greater interaction between main and pilot combustion zones, consequently reducing NO.sub.x /CO emissions.
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