Coordinated fuel-air controller for gas turbine without load fee

Power plants – Combustion products used as motive fluid

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60 3727, F02C 950

Patent

active

056365071

ABSTRACT:
A method of minimizing undesirable emissions from and acoustic pressure oscillations in a gas turbine includes the step of coordinating modulation of turbine fuel and air supply signals to maintain the fuel air ratio (FAR) within a selected range. Coordination of the modulation of fuel and air supply signals includes the steps of producing a turbine fuel supply control signal in correspondence with a turbine speed error signal, generating a coordinated turbine exhaust temperature error signal by modifying a preliminary turbine exhaust temperature error signal in correspondence with the derivative of the speed error signal, and producing a turbine air supply control signal from the coordinated turbine exhaust temperature error signal; the coordinated turbine exhaust temperature error signal provides coordination between the turbine fuel supply signal and the turbine air supply signal so as to maintain the fuel-air ratio of the combustible mixture being fed to the turbine within the selected range.

REFERENCES:
patent: 3584459 (1971-06-01), Amann
patent: 3899886 (1975-08-01), Swick
patent: 4529887 (1985-07-01), Johnson
patent: 4550565 (1985-11-01), Ozono
patent: 5487265 (1996-01-01), Rajamani et al.

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