Patent ID: 9500370
Filing Date: 2016-11-22
CPC Classification: F23R

Claim Text:
1. A combustion turbine engine having a combustor that includes a fuel nozzle in which a supply of compressed air and fuel are mixed for combustion, wherein the fuel nozzle further includes: a fuel plenum defined between a circumferentially extending shroud and axially by a forward tube-sheet and an aft tube-sheet; and a mixing-tube that extends across the fuel plenum that defines a passageway connecting an inlet formed through the forward tube-sheet and an outlet formed through the aft tube-sheet, the mixing-tube comprising one or more fuel ports that fluidly communicate with the fuel plenum; wherein the mixing-tube, comprises a plurality of grooves on an outer surface; wherein the mixing-tube is attached to the forward tube-sheet and aft tube-sheet along an interface that comprises a fail-safe leakage path; wherein the interface includes shoulders formed within each of the inlet and the outlet that engages a correspondingly shaped tip face formed on the mixing-tube, such that the mixing-tube is mechanically trapped therebetween.