Patent ID: 9599343
Date: 2017-03-21
CPC Classifications: F23D,F23R,Y10T

Claim:
1. A fuel nozzle for use in a turbine engine, the fuel nozzle comprising: an end cover; an end cap downstream of the end cover; a first plenum wall downstream of the end cover and upstream of the end cap, the end cover and the first plenum wall defining a liquid fuel plenum; a second plenum wall downstream of the first plenum wall and upstream of the end cap, the first plenum wall and the second plenum wall defining a first cooling plenum configured to receive a flow of cooling fluid through an aperture in a first cooling wall between the first plenum wall and the second plenum wall, and the second plenum wall and the end cap defining a gas fuel plenum configured to channel a flow of gas fuel into at least one premixer tube; said at least one premixer tube extending from the end cap and comprising a tube wall and a plurality of perforations in said tube wall and extending through said tube wall, said plurality of perforations configured to channel a flow of air therethrough; and at least one fuel injection tube extending from said first plenum wall through the liquid fuel plenum and through said second plenum wall and the first cooling plenum and through the gas fuel plenum to the end cap, to couple said liquid fuel plenum in flow communication with at least one fuel injector, wherein the flow of cooling fluid cools liquid fuel channeled through said fuel injection tube, wherein the at least one fuel injector is coupled in flow communication with said at least one fuel injection tube and said at least one premixer tube, said at least one fuel injector terminating at the end cap and configured to channel the liquid fuel from said liquid fuel plenum into said at least one premixer tube, wherein said at least one fuel injector is configured to direct a liquid fuel jet substantially axially into said at least one premixer tube, wherein the liquid fuel jet has a discharge angle of 5° to 15° with respect to a premixer tube centerline axis.