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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 axis, an improved construction is provided wherein each combustor has a center nozzle located on the center axis. Various methods of operating the improved combustor are also

In a gas turbine having a plurality of combustors, each having an annular array of outer fuel nozzles arranged about a center axis, an improved construction is provided wherein each combustor has a center nozzle located on the center axis. Various methods of operating the improved combustor are also disclosed. For example, one method of operating a combustor for a gas turbine wherein the combustor has a plurality of fuel nozzles in an annular array arranged about a center axis and has a center nozzle located on the center axis, and wherein the annular array is supplied with fuel from 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 includes the steps of:

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[ What is claimed is:] [1.] A method of operating a combustor for a gas turbine wherein the combustor has a plurality of outer fuel nozzles in an annular array arranged about a center axis, with two of said plurality of outer fuel nozzles in said annular array being cross-fire nozzles aligned with c

[ What is claimed is:] [1.] A method of operating a combustor for a gas turbine wherein the combustor has a plurality of outer fuel nozzles in an annular array arranged about a center axis, with two of said plurality of outer fuel nozzles in said annular array being cross-fire nozzles aligned with cross-fire tubes and remaining outer fuel nozzles in said annular array being non-cross-fire nozzles, a center nozzle located on the center axis, and a flame detector, and wherein the annular array is supplied with fuel from at least two pre-mix fuel manifolds, and further wherein the center nozzle is supplied with fuel from a center nozzle pre-mix fuel manifold the method comprising:a) at ignition, supplying the center nozzle with fuel from the center nozzle pre-mix fuel manifold and the two cross-fire nozzles with fuel from one of said at least two pre-mix fuel manifolds;b) after detecting cross-fire with the flame detector, turning off fuel to the two cross-fire nozzles, supplying all fuel to the center nozzle, and accelerating through full speed no load to a part load by increasing fuel flow to the center nozzle;c) at said part load, begin transferring some pre-mix fuel away from the center nozzle and staging it to the outer fuel nozzles in the following sequence as total fuel flow is increased: 1) center nozzle+two cross-fire nozzles, 2) center nozzle+non-cross-fire nozzles, and 3) all outer fuel nozzles but not the center nozzle;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.