A premixed dual fuel burner with a tapering injection component for main liquid fuel

Abstract

A premixed dual fuel burner includes a burner head, a burner interior elongated along a main axis and having an upstream side enclosed by a swirler and a downstream side enclosed by a premixing section, and an injection component. The burner head and sides are serially arranged. The swirler includes an inlet section for introducing air and a main gas fuel. The injection component has a tapering structure positioned along the main axis which extends from the burner head into the burner interior. The injection component tapers from a burner head side and an injection side along the main axis. At the injection side a liquid fuel outlet introduces a main liquid fuel into the burner interior. The injection side is disposed in the burner interior. At least one of the at least one liquid fuel outlet is at a side of the injection side of the injection component.

1 . A premixed dual fuel burner for a combustion chamber of a turbomachine, the premixed dual fuel burner comprising:
 a burner head having a burner head end,   a burner interior elongated along a main axis and having an upstream side and a downstream side, wherein the upstream side is disposed between the burner head and the downstream side and wherein the upstream side is fluidly connected to the downstream side,   a swirler enclosing the upstream side of the burner interior and comprising an inlet section configured to introduce air and a main gas fuel into the burner interior,   a premixing section enclosing the downstream side of the burner interior, wherein the swirler is arranged between the burner head and the premixing section, and wherein the premixing section comprises a burner outlet configured to be arranged with the combustion chamber such that the downstream side is fluidly connected to the combustion chamber, and   an injection component having a tapering structure positioned along the main axis and extending from the burner head into the burner interior, the injection component having a burner head side and an injection side and wherein the injection component tapers from the burner head side to the injection side along the main axis,   wherein the injection component comprises at least one liquid fuel outlet at the injection side and the injection component is configured to introduce a main liquid fuel into the burner interior through the at least one liquid fuel outlet and wherein the injection side of the injection component is disposed in the burner interior, and   wherein at least one of the at least one liquid fuel outlet is at a side of the injection side of the injection component.   
     
     
         2 . The premixed dual fuel burner according to  claim 1 ,
 wherein the tapering structure of the injection component is a conical structure.   
     
     
         3 . The premixed dual fuel burner according to  claim 1 ,
 wherein the tapering structure of the injection component is arranged coaxially to the main axis.   
     
     
         4 . The premixed dual fuel burner according to  claim 1 ,
 wherein a first distance along the main axis between the at least one liquid fuel outlet and the burner head end is between 20% and 80% of a second distance along the main axis between the burner outlet of the premixing section and the burner head end.   
     
     
         5 . The premixed dual fuel burner according to  claim 1 ,
 wherein the injection component is configured to be longitudinally adjustable such that a position of the at least one liquid fuel outlet of the injection component is changeable from a first location along the main axis to a second location along the main axis.   
     
     
         6 . The premixed dual fuel burner according to  claim 1 ,
 wherein the at least one liquid fuel outlet is positioned in the upstream side of the burner interior.   
     
     
         7 . The premixed dual fuel burner according to  claim 1 ,
 wherein the at least one liquid fuel outlet is positioned in the downstream side of the burner interior.   
     
     
         8 . The premixed dual fuel burner according to  claim 1 ,
 wherein the injection component comprises a second additional outlet configured to introduce the main liquid fuel into the burner interior and wherein the second additional outlet is at an end of the injection side, particularly at a tip, of the injection component.   
     
     
         9 . The premixed dual fuel burner according to  claim 1 ,
 wherein the inlet section of the swirler comprises at least one air inlet and at least one main fuel gas inlet.   
     
     
         10 . The premixed dual fuel burner according to  claim 9 ,
 wherein at least one of the at least one air inlet and the at least one main fuel gas inlet is arranged tangentially along the swirler with respect to the main axis.   
     
     
         11 . The premixed dual fuel burner according to  claim 1 ,
 wherein the swirler has a conical frustum shape having a top side and a bottom side and wherein a cross-section of the conical frustum increases from the top side towards the bottom side and wherein the top side is connected to the burner head and the bottom side is connected to the pre-mixing section.   
     
     
         12 . The premixed dual fuel burner according to  claim 1 ,
 wherein a part of the premixing section surrounding the burner outlet of the premixing section comprises an external pilot configured to introduce a pilot fuel into the combustion chamber.   
     
     
         13 . The premixed dual fuel burner according to  claim 1 ,
 wherein a radial width of the injection component reduces over an axial distance D by only or less than D/10.   
     
     
         14 . The premixed dual fuel burner according to  claim 1 ,
 wherein a radial width of the injection component reduces over an axial distance D by only or less than D/15.