Fuel injector assembly with water or auxiliary fuel capability

Claim 1

An air-blast fuel injector assembly useful in the compressor discharge airstream of a gas turbine power plant comprising: (a) a first sleeve means having a first longitudinal bore therethrough and having an open downstream end with a first annular lip and an upstream end; (b) a second sleeve means disposed inside said first sleeve means, said second sleeve means having a second longitudinal bore therethrough and having an open downstream end with a second annular lip disposed upstream from said first annular lip and an upstream end, portions of said second sleeve means being spaced from said first sleeve means to form an annular liquid fuel-receiving chamber therebetween extending toward said first and second lips where the chamber opens for discharging liquid fuel over said first lip to form a fuel spray cone; (c) a third sleeve means disposed inside said second sleeve means, said third sleeve means having a third longitudinal bore therethrough and having an open downstream end with a third annular lip disposed upstream from said second lip and an open upstream end, portions of said third sleeve means being spaced from said second sleeve means to form an annular water or auxiliary fuel-receiving chamber therebetween disposed inside relative to said liquid fuel-receiving chamber and extending toward said second and third lips where said chamber opens for discharging water or auxiliary fuel over said second lip in addition or alternatively to said liquid fuel, said third sleeve means receiving compressor discharge air through its open upstream end for discharge over said third lip to intermix with the fuel spray cone and/or water or auxiliary fuel from the inside, and (d) an annular shroud means disposed exteriorly of said first sleeve means, said shroud means having a longitudinal bore therethrough and having an open downstream end with an annular shroud lip disposed downstream from said first lip and an upstream end into which said first sleeve means extends, portions of said shroud means being spaced from said first sleeve means to form an annular air-receiving chamber disposed exteriorly around said first sleeve means and extending downstream toward said shroud lip where said air-receiving chamber opens for discharging air over said shroud lip to intermix with the fuel spray cone and/or water or auxiliary fuel from the outside and other portions of said shroud means forming aperture means for receiving compressor discharge air.