Pilot burner for combustor

A pilot burner for a combustor, the pilot burner comprising:

• an inner conduit configured to deliver a fuel;
• an outer conduit concentric with the inner conduit and configured to deliver air;
• an inner wall defining an inner plenum;
• a partition wall radially outward of the inner wall and defining an intermediate plenum with at least a portion of the inner wall, the inner wall including a plurality of exit passages for fluidly coupling the inner plenum to the intermediate plenum;
• an outer wall defining an outer plenum with at least a portion of the partition wall;
• a crossover section in fluid communication with the inner and outer conduit, the crossover section including a first plurality of passages fluidly coupling the inner conduit to the outer plenum and a second plurality of passages fluidly coupling the outer conduit to the inner plenum;
• and
• an end plate including a plurality of openings in fluid communication with a burner interior, the plurality of openings including a set of fuel exit openings in fluid communication with the outer plenum, a set of air exit openings adjacent the set of fuel exit openings and in fluid communication with the intermediate plenum, and a set of cooling openings in fluid communication with the inner plenum.

A gas turbine (GT) system, comprising:

• a compressor;
• a combustion section operatively coupled to the compressor and including an annular combustor, the annular combustor including a burner for a combustion chamber of the annular combustor, the burner including:
• a hood;
• a swirl generator operatively coupled to the hood and defining a first portion of a burner interior;
• a mixing tube downstream of the swirl generator and defining a second portion of the burner interior, the mixing tube having an outlet opening in fluid communication with the combustion chamber;
• and
• a pilot lance extending along a longitudinal axis and extending from the hood into the burner interior, the pilot lance including a pilot burner having a single fuel conduit for supplying a fuel, and an air conduit for supplying air;
• and
• a turbine operatively coupled to the combustion section
• wherein the single fuel conduit includes an inner conduit for supplying the fuel, and the air conduit includes an outer conduit concentric with the inner conduit for supplying air, and wherein the pilot burner further includes:
• an inner wall defining an inner plenum;
• an outer wall defining an outer plenum;
• and
• a crossover section including a first plurality of passages fluidly coupling the inner conduit to the outer plenum and a second plurality of passages fluidly coupling the outer conduit to the inner plenum.