Burner assembly for a combustor of a gas turbine power plant and combustor comprising said burner assembly

Abstract

A burner assembly for a combustor is provided with a pilot burner extending along a longitudinal axis and a premix burner surrounding the pilot burner; the pilot burner being integral with the premix burner.

1 . Burner assembly for a combustor, the burner comprising:
 a pilot burner extending along a longitudinal axis (A); and   a premix burner surrounding the pilot burner;   the pilot burner being integral with the premix burner.   
     
     
         2 . Burner assembly according to  claim 1 , wherein the premix burner and the pilot burner are a monolithic body. 
     
     
         3 . Burner assembly according to  claim 1 , wherein the premix burner and the pilot burner are two separated pieces fixed together. 
     
     
         4 . Burner assembly according to  claim 1 , wherein the pilot burner is fixed to an inner surface of the premix burner. 
     
     
         5 . Burner assembly according to  claim 3 , wherein the premix burner comprises:
 an inlet portion coupled to a fuel supply assembly; and   an injection portion extending, when in use, about the longitudinal axis (A) and coupled to the inlet portion.   
     
     
         6 . Burner assembly according to  claim 5 , wherein the injection portion is provided with a first end and a second end, the second end having a second section diameter lower than a first section diameter of the first end and the inlet portion being coupled to the second end. 
     
     
         7 . Burner assembly according to  claim 5 , wherein the pilot burner is fixed to the inlet portion of the premix burner. 
     
     
         8 . Burner assembly according to  claim 7 , wherein the pilot burner is fixed to the inlet portion of the premix burner along at least two contact zones axially displaced. 
     
     
         9 . Burner assembly according to  claim 4 , wherein the pilot burner and the premix burner are fixed together so as to define a sliding interface between the pilot burner and the premix burner. 
     
     
         10 . Burner assembly according to  claim 9 , wherein the sliding interface is defined by an air gap between the pilot burner and an inlet portion of the premix burner. 
     
     
         11 . Burner assembly according to  claim 1 , wherein the pilot burner comprises:
 at least two concentric conduits, at least one of the two concentric conduits being provided with an extendible portion.   
     
     
         12 . Burner assembly according to  claim 1 , wherein the premix burner comprises:
 at least one fuel supply conduit provided with a further extendible portion.   
     
     
         13 . Combustor for a gas turbine power plant the combustor comprising:
 the burner assembly claimed in  claim 1 .