Fuel injection nozzle assembly for gas turbine drive

Claim 1

A fuel injection nozzle assembly for gas turbine drives of the type having at least one heat exchanger for heating the combustion air, and a fuel injection nozzle which includes an annular conduit that runs coaxially to the longitudinal axis of the nozzle between an outer shielding wall and a sleeve-like central body having a passage for fuel supply, said annular conduit being ventilated by cool air that is not heated by the heat exchanger, characterized by the combination of the following features: (a) the fuel injection nozzle is confined in a structural part that is integrated in the engine housing, forming part of an outer housing of a combustion chamber, and from there the nozzle extends via a primary air supply bore in a back wall of a flame tube, into a primary zone of the combustion chamber; (b) the ventilated annular conduit of the injection nozzle is connected directly to a compressor end of the turbine drive and said central fuel supply passage is connected with a frontal section of the annular conduit via fuel supply bores in an injection head, and also with the primary zone by means of intake openings in the shielding wall; (c) the central body for fuel supply engages the outer shielding wall exclusively via localized contact surfaces on the ends of cross-pieces protruding radially from the central body and located in the region of the injection head and said engine housing integrated structural part; and (d) wherein said outer shielding member is formed of a material having the high temperature resistivity and low thermal conductivity of nickel alloys, and said central body is formed of a material having the high thermal conductivity of a copper alloy, whereby heat will be caused to flow from the injection head to the engine housing so as to act to prevent fuel carbonization.