Power plants – Combustion products used as motive fluid – Combined with regulation of power output feature
Reexamination Certificate
2008-01-22
2008-01-22
Casaregola, L. J. (Department: 3746)
Power plants
Combustion products used as motive fluid
Combined with regulation of power output feature
Reexamination Certificate
active
07320213
ABSTRACT:
A system for ranking combustion chambers in a gas turbine in order of chamber combustion temperature including: at least one fuel nozzle supplying fuel to the combustion chambers at a predetermined fuel rate abnormally near a lean blow out (LBO) condition of the chambers; at least one dynamic pressure sensor in each chamber sensing combustion dynamic pressures in said combustion chambers and generating dynamic pressure signals representative of the dynamic pressure in each of said combustion chambers, wherein the dynamic pressure signals provide information regarding the dynamic pressure at a plurality of frequencies; a signal band pass filter segmenting the signals into a plurality of predefined frequency bands comprising a lean blow out (LBO) precursor frequency band, a cold tone frequency band and a hot tone frequency band; a processor determining a value for each chamber representative of amplitudes of the signals in each of LBO precursor frequency band, the cold tone frequency band and the hot tone frequency band, wherein the value is characteristic of a combustion temperature within the chamber, and said processor ranking a plurality of the combustion chambers in an order of the combustion temperature.
REFERENCES:
patent: 6205765 (2001-03-01), Iasillo et al.
patent: 6955039 (2005-10-01), Nomura et al.
patent: 6979118 (2005-12-01), Mick et al.
patent: 2005/0278108 (2005-12-01), Norman et al.
Shah Minesh Ashok
Simons Derrick
Singh Ajai
Ziminsky Willy Steve
Casaregola L. J.
General Electric Company
Nixon & Vanderhye P.C.
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