Patent ID: 7412833
Filing Date: 2008-08-19
Classification: F23D,F23R

Abstract:
1. A method of cooling a fuel nozzle that includes an outer peripheral wall, a nozzle centerbody concentrically disposed within said outer wall, a fuel/air premixer including an air inlet, a fuel inlet, and a premixing passage defined between said outer wall and said centerbody and extending at least part circumferentially thereof; a cooling air flow passage defined within said centerbody and extending at least part circumferentially thereof; and a gas fuel flow passage defined within said centerbody and extending at least part circumferentially thereof; the method comprising: flowing cooling air through said cooling air passage toward and impinging said cooling air against an inner surface of an end face of the centerbody; and flowing spent impingement air from a vicinity of said inner surface to and into said premixing passage defined between said nozzle centerbody and said outer wall of said fuel nozzle.