Patent ID: 8522556
Filing Date: 2013-09-03
Classification: F23R

Abstract:
1. An air-staged diffusion nozzle disposed in a combustor of a gas turbine including a gas-fuel source and a compressed air source wherein the gas-fuel nozzle discharges to a burner tube space of the combustor, the air-staged diffusion nozzle comprising: providing an air-staged diffusion nozzle comprising a nozzle body including a gas-fuel cavity bounded by an outer peripheral wall disposed along a longitudinal axis of the nozzle; an end closure wall, a cooling air chamber disposed within the gas-fuel cavity; an outer swirler supplied by gas-fuel from the gas-fuel cavity and compressed air from an external space surrounding the nozzle body; and a forward projection of the cooling air chamber, extending through the peripheral wall of the within and projecting through an end closure nozzle body disposed along a longitudinal axis including the gas-fuel cavity, bounded distally by the end closure wall, bounded proximally by a connection to the gas-fuel source, and bounded peripherally by an annular wall; the outer swirler with swirl vanes extending from a tip end of the annular wall forming a swirled axial passage to a downstream burner tube space; a space external to the annular wall of the gas-fuel cavity including a compressed air source in fluid communication with the swirled axial passage of the outer swirler, and a plurality of passages through the annular wall from the gas-fuel cavity into the swirled axial annular passage of the outer swirler, wherein the outer swirler delivers a swirling mixture of a gas-fuel and the compressed air to the downstream burner tube space of the combustor; the cooling air chamber enclosed within the gas-fuel cavity and comprising the outer peripheral wall, wherein the outer peripheral wall disposed in proximity to the distal end of the gas-fuel cavity extends axially through the end closure wall to the burner tube space of the combustor; a plurality of passages through the annular wall of the gas-fuel cavity from the external compressed air space coupled in fluid communication with the cooling air chamber; and