Dual fuel nozzle tip assembly

A tip assembly for a fuel nozzle, comprising:

• a. an annular impingement plate, the impingement plate at least partially defining an insert passage that extends concentrically through the impingement plate along a longitudinal axis of the diffusion tip assembly;
• b. an annular cap disposed coaxially downstream from the impingement plate, the cap at least partially defining a cooling flow outlet, the cooling flow outlet being aligned with the insert passage, the cap having an outer portion that extends between the impingement plate and the cap, the outer portion, the cap and the impingement plate at least partially defining a cooling plenum therebetween;
• and
• c. a plurality of angled cooling ports extending through the impingement plate to provide fluid communication into the cooling plenum, the plurality of cooling ports being set at an angle with respect to the longitudinal axis of the impingement plate within a plane defined between the longitudinal axis and a tangential axis of the impingement plate.

A gas turbine comprising:

• a. a compressor at an upstream end of the gas turbine, a combustor positioned downstream from the compressor, and a turbine positioned downstream from the combustor, the combustor being in fluid communication with a fuel supply and a compressed air supply, the combustor having an end cover coupled to a casing, the casing at least partially surrounds the combustor, a fuel nozzle extends downstream from the end cover, the fuel nozzle comprising:
• i. a burner tube component;
• ii. a center nozzle assembly concentrically disposed within the burner tube component, the center nozzle assembly having an annular center body that at least partially defines a cooling air flow passage through the center nozzle assembly, the center body having a downstream end;
• iii. a premix flow passage defined between the burner tube component and the center body assembly;
• iv. a tip assembly disposed at the downstream end of the center body, the diffusion tip assembly having an impingement plate that extends radially across the downstream end of the center body and a radially extending cap disposed coaxially downstream from the impingement plate, the impingement plate and the cap at least partially defining a cooling plenum therebetween, the impingement plate at least partially defining an insert passage and the cap at least partially defining a cooling flow outlet that is aligned with the insert passage;
• and
• v. a plurality of angled cooling ports that extend through the impingement plate to provide for fluid communication between the cooling air flow passage and the cooling plenum.