To provide a pilot nozzle of a gas turbine combustor, where a measure to counter heat elongation is taken.
This pilot nozzle has such structure that an oil fuel supply pipe 6 is arranged at the center of a heat insulating air layer 3 provided along the axis. A plurality of atomized fluid supply paths 12 are arranged in the circumferential direction of the tube 7 surrounding the heat insulating air layer 3. Moreover, in case that the pilot nozzle is a dual fuel system, a plurality of gas supply paths 13 are arranged independently in circumferential direction similar to the above atomized fluid supply path 12. Moreover, the atomized fluid supply paths 12 and the gas fuel supply paths 13 are arranged equally alternately. By arranging it into such constitution, the heat insulating air layer can be taken largely to its maximum in diametrical direction, so the center oil fuel supply pipe can be protected from high temperature from outside the pilot nozzle.
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ICHIYANAGI TAKU
MATSUI KAZUHIRO
