Burner tip having an air channel structure and a fuel channel structure for a burner, and method for producing said burner tip

Abstract

A burner tip for installation in a burner, wherein the burner tip has a surface facing a combustion chamber, an air channel structure leading to the surface and defining an air channel, and a fuel channel structure leading to the surface, and wherein the fuel channel structure defines a fuel channel, which extends in a surface region of the burner tip in a first direction parallel to the surface and then extends back, at least in part, in a second direction, different from the first direction, in order to cool the surface region of the burner tip by a fuel flowing through the fuel channel during operation of the burner tip.

1 . A burner tip for installation in a burner, comprising:
 a surface facing a combustion chamber,   an air channel structure leading to the surface and defining an air channel, and   a fuel channel structure leading to the surface,   wherein the fuel channel structure defines a fuel channel which runs in a surface region of the burner tip in a first direction parallel to the surface and then extends back, at least in part, in the surface region in a second direction, different from the first direction, in order to cool the surface region of the burner tip by a fuel flowing through the fuel channel when the burner tip is in operation.   
     
     
         2 . The burner tip as claimed in  claim 1 ,
 wherein the fuel channel extends starting from its course along the first direction into an inside of the burner tip and then opens out via at least one further directional change into the surface.   
     
     
         3 . The burner tip as claimed in  claim 1 ,
 wherein the first direction encloses an angle of between 160° and 200° relative to the second direction.   
     
     
         4 . The burner tip as claimed in  claim 1 ,
 wherein the fuel channel, subsequent to its course along the first direction and before an opening into the surface, has a region with an enlarged cross section.   
     
     
         5 . The burner tip as claimed in  claim 1 ,
 wherein the air channel structure comprises a central air channel which leads to a central outlet opening in the burner tip.   
     
     
         6 . The burner tip as claimed in  claim 1 ,
 wherein the burner tip has an inlet region in which both the air channel and the fuel channel run coaxially and an outlet region which is offset with respect to the inlet region along an axis of symmetry.   
     
     
         7 . The burner tip as claimed in  claim 6 ,
 wherein the fuel channel runs in the inlet region radially outside the air channel.   
     
     
         8 . The burner tip as claimed in  claim 6 ,
 wherein the fuel channel runs in the outlet region at least partly radially within the air channel.   
     
     
         9 . The burner tip as claimed in  claim 1 ,
 wherein the fuel channel and the air channel run in an interlocking manner, so that the surface region of the burner tip can be cooled in addition by an air flow.   
     
     
         10 . The burner tip as claimed in  claim 1 ,
 wherein the fuel channel structure has vanes which subdivide the fuel channel into a plurality of sub-channels.   
     
     
         11 . The burner tip as claimed in  claim 6 ,
 wherein the fuel channel structure in the inlet region defines an annular chamber and wherein the fuel channel structure is formed in such a manner that the fuel channel runs through the annular chamber subsequent to its course in the second direction and before it opens out into the surface.   
     
     
         12 . The burner tip as claimed in  claim 1 ,
 wherein the air channel runs at least in part through the fuel channel and wherein the air channel structure has a plurality of air channels which lead into the combustion chamber at different outlet angles relative to the surface.   
     
     
         13 . The burner tip as claimed in  claim 1 ,
 wherein the air channel structure and the fuel channel structure define channel cross sections which have a cross-sectional shape that differs from a round or circular shape.   
     
     
         14 . The burner tip as claimed in  claim 1 ,
 wherein the surface is formed by an openly porous wall structure which defines a plurality of air channels.   
     
     
         15 . The burner tip as claimed in  claim 1 ,
 wherein the burner tip is manufactured additively and integrally.   
     
     
         16 . A gas turbine comprising
 a burner tip as claimed in  claim 1 .   
     
     
         17 . A method for manufacturing a burner tip as claimed in  claim 1 , wherein the burner tip is manufactured additively and integrally. 
     
     
         18 . The burner tip as claimed in  claim 2 ,
 wherein the fuel channel extends starting from its course along the first direction into an inside of the burner tip and then opens out via at least one further directional change comprising a deflection of between 70° and 110° into the surface.