Burner assembly

Abstract

A burner assembly for a gas turbine is provided. The burner assembly has a combustor, a centrally arranged pilot burner and plurality of main burners surrounding the pilot burner. Each main burner has a cylindrical housing having a lance which is centrally arranged therein and has a fuel channel for liquid fuel. The lance is supported on the housing by swirl blades and an attachment is arranged on the lance in the direction of the combustor. The liquid fuel nozzle is arranged in the attachment downstream of the swirl blades and connected to the fuel channel. For the improved mixing of the fuel with the air, the liquid fuel nozzle is designed as a full jet nozzle and the full jet nozzle has a length and a diameter, the ratio of the length to the diameter is at least 1.5.

1 .- 36 . (canceled) 
     
     
         37 . A burner assembly for a gas turbine, comprising:
 a combustor;   a centrally arranged pilot burner; and   a plurality of main burners surrounding the pilot burner,   wherein each of the main burners comprises a cylindrical housing having a lance that is centrally arranged therein and has a fuel channel for liquid fuel,   wherein the lance is supported on the housing by swirl blades,   wherein an attachment is arranged on the lance in a direction of the combustor,   wherein a liquid fuel nozzle is arranged in the attachment downstream of the swirl blades and connected to the fuel channel,   wherein the liquid fuel nozzle is a full jet nozzle,   wherein a ratio of a length to a diameter of the full jet nozzle is at least 1.5, and   wherein a fuel and drop size distribution is optimized as a function of an alignment of an injection position of the full jet nozzle relative to a pilot cone.   
     
     
         38 . The burner assembly as claimed in  claim 37 ,
 wherein the attachment has a cylindrical part and a part tapering conically in the direction of the combustor, and   wherein the conical part has a cone angle of 10 to 20 degrees.   
     
     
         39 . The burner assembly as claimed in  claim 37 ,
 wherein the attachment comprises a central attachment axis, and   wherein the full jet nozzle comprises a central axis and is arranged in the attachment so that the central axis of the full jet nozzle is at an angle of 90 degrees or between 90+/−30 degrees to the central attachment axis of the attachment.   
     
     
         40 . The burner assembly as claimed in  claim 37 ,
 wherein the attachment has an attachment surface, and   wherein the full jet nozzle comprises a central axis and is arranged in the attachment so that the central axis of the full jet nozzle is perpendicular to the attachment surface or at an angle of −10 degrees to +10 degrees with a surface normal of the attachment surface.   
     
     
         41 . The burner assembly as claimed in  claim 37 , wherein the full jet nozzle is arranged along a peripheral line running around the attachment. 
     
     
         42 . The burner assembly as claimed in  claim 41 ,
 wherein eight to twelve full jet nozzles are provided for the each of the main burners, and   wherein diameters of the full jet nozzles are between 0.55 mm and 0.8 mm, or between 0.6 mm and 0.7 mm, or between 0.55 mm and 0.65 mm, or between 0.7 mm and 0.8 mm.   
     
     
         43 . The burner assembly as claimed in  claim 42 ,
 wherein more full jet nozzles are arranged on a side of the attachment facing the pilot burner than on a side of the attachment facing away from the pilot burner,   wherein a density of the full jet nozzles varies in a peripheral direction along the peripheral line,   wherein the full jet nozzles are arranged along the peripheral line so that an inclination of central axes of the full jet nozzles in a direction of a central attachment axis of the attachment varies in the peripheral direction,   wherein the central axes of the full jet nozzles are alternately aligned running perpendicular to the central attachment axis and is angled maximum 20 degrees in a direction of the central attachment axis,   wherein the central axis of at least one full jet nozzle has an inclination in the peripheral direction from a position perpendicular to the central attachment axis.   
     
     
         44 . The burner assembly as claimed in  claim 42 , wherein the full jet nozzles have different diameters or same diameter along the peripheral line. 
     
     
         45 . The burner assembly as claimed in  claim 42 ,
 wherein the full jet nozzles are arranged along an upstream peripheral line and a downstream peripheral line running in a ring shape and perpendicular to a central attachment axis of the attachment at different axial positions,   wherein the full jet nozzles arranged along the upstream peripheral line have a larger diameter than the full jet nozzles arranged along the downstream peripheral line, or   wherein the full jet nozzles arranged along the upstream peripheral line have a smaller diameter than the full jet nozzles arranged along the downstream peripheral line.   
     
     
         46 . The burner assembly as claimed in  claim 45 ,
 wherein the full jet nozzles arranged along the downstream peripheral line are arranged on common flow lines with the full jet nozzles arranged along the upstream peripheral line so that air can be swirled along the flow lines when the air flows through the swirl blades, or   wherein the full jet nozzles arranged along the downstream peripheral line are arranged offset with the full jet nozzles arranged along the upstream peripheral line so that air can be swirled along flow lines on which only one of the full jet nozzles is arranged when the air flows through the swirl blades.   
     
     
         47 . The burner assembly as claimed in  claim 45 , wherein the full jet nozzles arranged along the downstream peripheral line inject fuel to a same radial position as the full jet nozzles arranged along the upstream peripheral line. 
     
     
         48 . The burner assembly as claimed in  claim 42 ,
 wherein the full jet nozzles are arranged along a helical peripheral line,   wherein diameters of the full jet nozzles arranged along the helical peripheral line increase in a flow direction or increase counter to the flow direction.   
     
     
         49 . The burner assembly as claimed in  claim 42 , wherein the full jet nozzles are arranged along two helical peripheral lines. 
     
     
         50 . The burner assembly as claimed in  claim 42 , wherein the full jet nozzles arranged along the peripheral line are at distances from one another and diameters of the full jet nozzles are repeated along the peripheral line. 
     
     
         51 . The burner assembly as claimed in  claim 50 ,
 wherein a full jet nozzle with a smaller diameter is arranged along the peripheral line between two full jet nozzles of same diameter,   wherein the full jet nozzle with the smaller diameter is arranged closer to one of the two full jet nozzles with a larger diameter.   
     
     
         52 . The burner assembly as claimed in  claim 50 ,
 wherein the full jet nozzles arranged along the peripheral line inject a fuel having a radial distribution about a central attachment axis of the attachment, and   wherein the fuel distribution comprises a ring-shaped zone of a first fuel distribution and a ring-shaped zone of a second fuel distribution.   
     
     
         53 . The burner assembly as claimed in  claim 52 ,
 wherein the ring-shaped zone of the first fuel distribution overlaps with the ring-shaped zone of the second fuel distribution, or   wherein the ring-shaped zone of the first fuel distribution is at a distance from the ring-shaped zone of the second fuel distribution.