Combustor and a method for cooling the combustor

摘要

A combustor includes a first shroud extending circumferentially inside the combustor and at least partially defining an inlet passage. A second shroud extends circumferentially inside the combustor. The second shroud defines an outlet passage. A first plate extends radially inside the second shroud downstream from the inlet passage of the first shroud and upstream from the outlet passage of the second shroud. The first plate generally defines an inlet port and an outlet port. A second plate extends radially around the first plate downstream from the inlet port and upstream from the outlet port of the first plate. A first fluid flow path extends from the inlet passage to the inlet port. A second fluid flow path extends from the outlet port to the outlet passage. A baffle extends from the first shroud to the first plate. The baffle separates the first and second fluid flow paths.

主权项

1. A combustor, comprising:
an end cover coupled to a casing and a plurality of fuel nozzles disposed within the casing, wherein the plurality of fuel nozzles extend axially downstream from the end cover with respect to an axial centerline of the combustor; a cap assembly axially spaced from the end cover, at least partially surrounding the plurality of fuel nozzles and disposed within the casing, the cap assembly comprising:
an annular shaped first shroud coaxially aligned with the axial centerline of the combustor and radially spaced from the casing so as to partially define an annular passage therebetween, wherein the first shroud defines at least one inlet passage;an annular shaped second shroud coaxially aligned with the axial centerline of the combustor and axially offset from the first shroud;a first plate that extends radially and circumferentially across one end of the second shroud, wherein the first plate is coupled to the first shroud via a baffle plate that is set radially inwardly from the second shroud so as to define an outlet plenum therebetween, wherein the first plate, the first shroud, and the baffle plate at least partially define an inlet plenum therebetween, wherein the first plate defines a plurality of fuel nozzle passages, each fuel nozzle passage being axially aligned with a respective fuel nozzle of the plurality of fuel nozzles, wherein the first plate defines a plurality of inlet ports in fluid communication with the inlet plenum and at least one outlet port in fluid communication with the outlet plenum; anda second plate axially spaced from the first plate and connected to a periphery edge of the first plate, wherein the first plate and the second plate define an intermediate plenum therebetween, wherein the plurality of inlet ports and the at least one outlet port are in fluid communication with the intermediate plenum.