System for reducing flame holding within a combustor

摘要

A system for reducing flame holding within a combustor includes a high pressure plenum and a head end plenum defined within the combustor. A cap assembly defines an inner plenum within the combustor and a fuel nozzle passage that extends through the cap assembly. A primary fuel nozzle has an annular burner tube that at least partially defines a premix flow passage through the cap assembly. The primary fuel nozzle and the burner tube at least partially define an inlet to the premix flow passage. A high pressure flow passage and a cooling flow passage are defined within the combustor. The high pressure flow passage defines a flow path between the high pressure plenum and the inner plenum, and the cooling flow passage defines a flow path between the high pressure plenum and the head end plenum.

主权项

1. A combustor for a gas turbine, comprising:
an end cover coupled to a casing, wherein the casing at least partially defines a high pressure plenum, wherein the end cover and the casing form a head end plenum that is in fluid communication with the high pressure plenum; a cap assembly disposed within the casing, the cap assembly including a base plate axially spaced from the end cover, a cap plate axially spaced from the base plate and a shroud that extends from the base plate to the cap plate, wherein the base plate, the shroud and the cap plate form an inner plenum within the combustor, wherein the inner plenum is fluidly sealed from the head end plenum, and wherein the shroud defines an inlet port that at least partially defines a flow passage from the high pressure plenum into the inner plenum; and a primary fuel nozzle extending from the end cover through the head end plenum, the base plate, the inner plenum and the cap plate, the primary fuel nozzle having a premix flow passage defined between a center body and a burner tube, wherein an inlet to the premix passage is in fluid communication with the inner plenum and is fluidly sealed from the head end plenum.