Combustor nozzle and method for supplying fuel to a combustor

摘要

A combustor nozzle includes a first and second liquid fuel passages that terminate at first and second fuel ports. A first diluent passage terminates at a first diluent outlet radially surrounding the second fuel ports. A second diluent passage terminates at a second diluent outlet between the first diluent outlet and the second fuel ports. A third diluent passage surrounds at least a portion of the first and second diluent passages. A method for supplying fuel to a combustor includes flowing a liquid fuel through a first fuel passage and flowing an emulsified liquid fuel through a second fuel passage. The method further includes flowing a first diluent through a shroud surrounding the second fuel passage to a first diluent passage surrounding at least a portion of the second fuel passage and flowing a second diluent through a second diluent passage radially disposed between the first diluent passage and the second fuel passage.

主权项

1. A fuel nozzle assembly comprising:
a center body configured to extend axially downstream from an end cover of a combustor, the center body comprising:
a first intermediate tube that extends axially within the center body and a first diluent passage defined therebetween;an annular disk disposed at a downstream end of the first intermediate tube, wherein the disk is axially offset upstream from a downstream surface of the center body, wherein the disk defines a plurality of circumferentially spaced vanes which provide for fluid communication from the first diluent passage through the disk;a second intermediate tube that extends axially within the first intermediate tube and through an opening defined by the disk, wherein the second intermediate tube and the first intermediate tube define a second diluent passage therebetween;an inner tube that extends axially within the second intermediate tube, wherein the inner tube defines a first fuel passage therein and the inner tube and the second intermediate tube define a second fuel passage therebetween, the first fuel passage terminating at first fuel port defined in an end wall that extends radially between a downstream end of the inner tube and a downstream end of the second intermediate tube, the second fuel passage terminating at a plurality of second fuel ports annularly arranged around the first fuel port proximate to the end wall; anda flow sleeve circumferentially surrounding an end portion of the second intermediate tube and extending axially through the disk opening, the flow sleeve and the end portion of the intermediate tube defining an annular flow passage therebetween, wherein the flow sleeve defines a plurality of circumferentially spaced radial passages in fluid communication with the second diluent passage and the annular flow passage.