Gas turbine burner hub with pilot burner

Abstract

A burner arrangement for a combustion chamber for combustion of fluid fuels has a main burner and pilot burner arranged centrally within the main burner for the ignition and/or stabilization of the combustion of the main burner. The main burner has central fuel feed arrangement arranged around the pilot burner, an annular air duct surrounding the central fuel feed arrangement for the supply of combustion air, first fuel nozzles for injection of substantially gaseous fuel into the annular air duct. The first fuel nozzles are fed from a first fuel distributor in the central fuel feed arrangement, and second fuel nozzles for the injection of a substantially liquid fuel into the annular air duct are fed from a second fuel distributor in the central fuel feed arrangement. Ducts are provided which branch off from at least one of the fuel distributors and issue into the pilot burner.

1 . A burner arrangement for a combustion chamber for burning fluid fuels, comprising:
 a main burner and a pilot burner arranged centrally therein, which pilot burner serves to ignite and/or to stabilize main burner combustion,   the main burner comprising
 a central fuel feed arrangement arranged around the pilot burner, 
 an annular air duct surrounding the central fuel feed arrangement for supplying combustion air, 
 first fuel nozzles for injecting a substantially gaseous fuel into the annular air duct, wherein the first fuel nozzles are supplied by a first fuel manifold in the central fuel feed arrangement, and 
 second fuel nozzles for injecting a substantially liquid fuel into the annular air duct, wherein the second fuel nozzles are supplied by a second fuel manifold in the central fuel feed arrangement, 
   wherein ducts are provided which branch off from at least one of fuel manifolds and lead into the pilot burner and the pilot burner has a gas feed duct independent of the ducts.   
     
     
         2 . The burner arrangement as claimed in  claim 1 ,
 wherein the pilot burner comprises a pilot annular air duct which supplies combustion air and the ducts lead into this pilot annular air duct.   
     
     
         3 . The burner arrangement as claimed in  claim 2 ,
 wherein the ducts leading into the pilot annular air duct are uniformly distributed around the circumference thereof.   
     
     
         4 . The burner arrangement as claimed in  claim 1 ,
 wherein the ducts take the form of bores.   
     
     
         5 . The burner arrangement as claimed in  claim 1 ,
 wherein the ducts branch off from the second fuel manifold and have nozzles at their ends leading into the pilot burner.   
     
     
         6 . The burner arrangement as claimed in  claim 5 ,
 wherein the nozzles are cavitation-free and screw-fastenable.   
     
     
         7 . The burner arrangement as claimed in  claim 1 ,
 wherein the annular air duct comprises swirl vanes and the first fuel nozzles are arranged in these swirl vanes.   
     
     
         8 . The burner arrangement as claimed in  claim 1 ,
 wherein the pilot burner comprises an oil feed duct independent of the ducts.   
     
     
         9 . The burner arrangement as claimed in  claim 1 ,
 wherein the combustion chamber comprises a gas turbine combustion chamber,