Patent ID: 7165405
Filing Date: 2007-01-23
Classification: F23D,F23R

Abstract:
1. A premix fuel nozzle assembly capable of dual fuel operation for use in a gas turbine comprising: a base; a first tube having a first outer diameter, a first inner diameter, a first thickness, and opposing first tube ends, said base fixed to said first tube at one of said ends; a second tube coaxial with said first tube and having a second outer diameter, a second inner diameter, a second thickness, and opposing second tube ends, said second outer diameter smaller than said first inner diameter thereby forming a first annular passage between said first and second tubes; a third tube coaxial with said second tube and having a third outer diameter, a third inner diameter, a third thickness, and opposing third tube ends, said third outer diameter smaller than said second inner diameter thereby forming a second annular passage between said second and third tubes, said third tube having a third annular passage contained within said third inner diameter; a fourth tube coaxial with said third tube and having a fourth outer diameter, a fourth inner diameter, a fourth thickness, and opposing fourth tube ends, said fourth tube having a means for fixed engagement at one of said ends, said fourth outer diameter smaller than said third inner diameter thereby forming a third annular passage between said third and fourth tubes; a fifth tube coaxial with said fourth tube and having a fifth outer diameter, a fifth inner diameter, a fifth thickness, and opposing fifth tube ends, said fifth outer diameter smaller than said fourth inner diameter thereby forming a fourth annular passage between said fourth and fifth tubes, said fifth tube having a swirler proximate one of said fifth tube ends on said outer diameter such that a swirl is imparted to fluid flowing through said fourth annular passage, a means for fixed engagement at said end opposite to said swirler, said fifth tube having a fifth passage contained within the said fifth inner diameter; an injector assembly fixed to each of said first, second, and third tubes at said tube ends thereof opposite said base, said injector assembly having a plurality of radially extending fins, each of said fins having an outer surface, an axial length, a radial height, and a circumferential width, a first radially extending slot within said fin and a second radially extending slot within said fin, a set of first injector holes located in the outer surface of each of said fins and in fluid communication with said first slot therein, a set of second injector holes located in the outer surface of each of said fins and in fluid communication with said second slot therein, and a fin cap fixed to the radially outermost portion of the outer surface of said fin to enclose said slots; a cap assembly fixed to said injector assembly and having a sixth outer diameter and a sixth inner diameter wherein said sixth inner diameter is substantially the same as said third inner diameter; wherein each of said first slots is in fluid communication with said first passage and each of said second slots is in fluid communication with said second passage.