Apparatus for mixing fuel in a gas turbine nozzle

摘要

A fuel nozzle in a combustion turbine engine that includes: a fuel plenum defined between an 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. The mixing-tube may include grooves on an outer surface, and be attached to the forward tube-sheet by a connection having a fail-safe leakage path.

主权项

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.