Title: Combined cycle electric power plant and a gas turbine having improved liquid fuel flow detection

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Abstract: A combined cycle power plant includes gas and steam turbines and steam generators and a digital/analog control system. A megawatt load control system varies a fuel control signal to govern a detected power output according to a reference value. The fuel control signal determines the flow rate of fuel to the combustor of a gas turbine-generator that is adapted to use gas and liquid fuels. A flow divider comprises a plurality of gear pumps connected to rotate with a common shaft, and distributes liquid fuel equally to a plurality of nozzles of the combustor, the total liquid fuel flow to the nozzles being related to the shaft speed. The shaft speed is detected and a signal representative of the total liquid fuel flow is generated in response to the detected speed. During fuel transfer a liquid fuel valve is positioned to govern the detected liquid fuel flow according to a desired flow such that the power output that results when both the gas and liquid fuels flow to the combustor is dependent upon the level of the fuel control signal and independent of the relative levels of the gas and liquid fuel flows. Undesirable power output disturbances that typically occur during fuel transfer due to nonlinearities of fuel system components are reduced.


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