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In a gas turbine having a plurality of combustors, each having an annular array of outer fuel nozzles arranged about a center fuel nozzle. A method for operating the combustors wherein the annular array is supplied with fuel from a diffusion manifold and at least one pre-mix manifold, and further wh

In a gas turbine having a plurality of combustors, each having an annular array of outer fuel nozzles arranged about a center fuel nozzle. A method for operating the combustors wherein the annular array is supplied with fuel from a diffusion manifold and at least one pre-mix manifold, and further wherein the center nozzle is supplied with fuel from a center premix manifold includes the steps of:

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[ What is claimed is:] [1.] A method of operating a combustor wherein the combustor has a plurality of fuel nozzles in an annular array arranged about a center axis and a center nozzle located on the center axis, and wherein the annular array is supplied with fuel from a diffusion fuel manifold and

[ What is claimed is:] [1.] A method of operating a combustor wherein the combustor has a plurality of fuel nozzles in an annular array arranged about a center axis and a center nozzle located on the center axis, and wherein the annular array is supplied with fuel from a diffusion fuel manifold and at least one pre-mix fuel manifold, and further wherein the center nozzle is supplied with fuel from a center nozzle pre-mix fuel manifold comprising the steps of:a) at start-up, supplying at least some of the fuel nozzles in the annular array with diffusion fuel from the diffusion fuel manifold;b) at part speed, supplying pre-mix fuel from the said at least one pre-mix fuel manifold to one of the nozzles in the annular array;c) at full speed, part load, transferring those of the fuel nozzles in the annular array supplied with diffusion fuel in step a) to pre-mix fuel;d) as load is further increased, initiating pre-mix fuel supply to the center nozzle without adding to the supply of pre-mix fuel to the fuel nozzles in the annular array; and thene) supplying additional pre-mix fuel to all of the fuel nozzles in the annular array and the center nozzle to thereby uniformly increase the fuel/air ratio as the turbine load increases.