Dual fuel nozzle tip assembly with impingement cooled nozzle tip

摘要

A fuel nozzle for a combustor includes a burner tube and a center nozzle assembly disposed within the burner tube. The center nozzle assembly includes a center body that at least partially defines a cooling air flow passage through the center nozzle assembly. A premix flow passage is defined between the burner tube and the center nozzle assembly. A tip assembly is disposed at a downstream end of the center body. The tip assembly includes an impingement plate, and a cap that is disposed downstream from the impingement plate. The impingement plate and the cap at least partially define a cooling plenum therebetween. An insert passage extends through the impingement plate and a cooling flow outlet extends through the cap. A plurality of cooling ports extends through the impingement plate to provide for fluid communication between the cooling air flow passage and the cooling plenum.

主权项

1. A fuel nozzle for a combustor, the fuel nozzle comprising:
a burner tube component; a center nozzle assembly concentrically disposed within the burner tube component, the center nozzle assembly having center body that at least partially defines a cooling air flow passage through the center nozzle assembly, the center body having a downstream end; a premix flow passage defined between the burner tube component and the center nozzle assembly; a tip assembly disposed at the downstream end of the center body, the tip assembly having an impingement plate that extends radially across the downstream end of the center body, and a radially extending cap disposed downstream from the impingement plate, the impingement plate and the cap at least partially defining a cooling plenum therebetween; an insert passage that extends through the impingement plate; a cooling flow outlet that extends through the cap, the cooling flow outlet being coaxially aligned with the insert passage; a plurality of cooling ports that extend through the impingement plate to provide for fluid communication between the cooling air flow passage and the cooling plenum;
an annular heat shield concentrically disposed within the insert passage; andone of a liquid fuel cartridge or a purge air bypass cartridge concentrically disposed within the insert passage of the impingement plate and that extends through the heat shield.