Method and apparatus for automatically actuating fuel trim valves in a gas

The gas turbine combustion system comprising:

• a plurality of combustion chambers;
• a plurality of fuel nozzles for each of Said combustion chambers;
• a plurality of manifolds for supplying fuel to at least one fuel nozzle in each of the combustion clambers;
• the manifolds having a flow metering devices for the fuel nozzles, wherein the flow metering devices are mounted on the manifolds for metering the fuel to the fuel nozzles in the combustion chambers, and
• a flow metering controller automatically actuating one or more of the flow metering devices to adjust fuel to the fuel nozzles based on gas turbine operating conditions, wherein the manifolds each comprise a nested arrangement of fuel supply lines connecting the manifold to one of the fuel nozzles, and wherein the flow metering devices are each mounted on a respective fuel supply line.

A gas turbine combustion system comprising:

• a plurality of combustion chambers;
• plurality of fuel nozzles for each of said combustion chambers;
• a plurality of manifolds for supplying fuel to at least one of said fuel nozzles in each of the combustion chambers, wherein the manifold have differing fuel flow capacities and each of the manifolds has mounted thereon flow metering devices for said fuel nozzles;
• a plurality of sensors for measuring a condition of exhaust gas from the combustion chambers, and
• a controller automatically actuating one of the flow metering devices, separately from another one of the flow metering devices, to adjust fuel flow to the fuel nozzles based on exhaust gas data collected from the sensors.