Abstract: A system for providing fuel to a combustor assembly in a gas turbine engine includes a main fuel valve assembly a plurality of multi-stage combustor valve assemblies. Each multi-stage combustor valve assembly is provided for delivering fuel to a respective combustor of the combustor assembly and includes at least two stage valves, each stage valve in communication with a respective stage within the corresponding combustor. The main fuel valve assembly receives fuel from a source of fuel and selectively delivers the fuel to the plurality of multi-stage combustor valve assemblies. Each stage valve within each multi-stage combustor valve assembly is adjustable to control delivery of fuel to each respective stage.

Abstract: A fuel modulation system usable in can-annular combustor systems of turbine engines for more efficiently managing fuel flow to reduce the amount of NOx while maintaining appropriate combustor flame temperatures. The fuel modulation system controls individual inline modulation valves in cooperation with a overall stage control valve to bring a turbine engine through the startup phase and to maintain operating conditions at a load set point while reducing NOx variability between baskets by using individual combustor dynamic pressure measurements. The fuel modulation system may be managed such that individual inline modulation valves remain within a predetermined range of positions relative to a nominal position to reduce NOx variability.

Abstract: A fuel modulation system usable in can-annular combustor systems of turbine engines for more efficiently managing fuel flow to reduce the amount of NOx while maintaining appropriate combustor flame temperatures. The fuel modulation system controls individual inline modulation valves in cooperation with a overall stage control valve to bring a turbine engine through the startup phase and to maintain operating conditions at a load set point while reducing NOx variability between baskets by using individual combustor dynamic pressure measurements. The fuel modulation system may be managed such that individual inline modulation valves remain within a predetermined range of positions relative to a nominal position to reduce NOx variability.