Burner and Method for Reducing Self-Induced Flame Oscillations

Abstract

A method for reducing self-induced flame oscillations is provided. In a first fluid mass flow flowing through a jet nozzle from a fluid inlet opening to a fluid outlet opening, a second fluid mass flow is injected on an axial position of the jet nozzle positioned downstream from the fluid inlet opening. One fluid mass flow includes air, and the other fluid mass flow includes a fuel. A second method for reducing self-induced flame oscillations is also provided. In a first fluid mass flow flowing through a jet nozzle from a fluid inlet opening to a fluid outlet opening, a second fluid mass flow is injected on a radial position of the jet nozzle in relation to the circumference of the jet nozzle. One mass flow includes air and the other fluid mass flow includes a fuel. Burners which ensure the execution of the method are also provided.

1 .- 27 . (canceled) 
     
     
         28 . A method for reducing self-induced flame oscillations, comprising:
 injecting a second mass flow of fluid that includes a fuel into a first mass flow of fluid comprising air and flowing through a jet nozzle from a fluid inlet opening to a fluid outlet opening wherein the second mass flow of fluid is injected at an axial position on the jet nozzle downstream of the fluid inlet opening; and   injecting a third mass flow of fluid into the first mass flow of fluid from the fuel line from which the first mass flow of fluid flows into the jet nozzle wherein the third mass flow of fluid is injected at a first plurality of positions disposed mutually offset in an axial direction around a circumference of the jet nozzle.   
     
     
         29 . A method for reducing self-induced flame oscillations, comprising:
 injecting a second mass flow of fluid comprising a fuel into a first mass flow of fluid comprising air and flowing through a jet nozzle from a fluid inlet opening to a fluid outlet opening wherein the second mass flow is injected at a radial position on the jet nozzle with respect to a circumference of the jet nozzle; and   injecting a third mass flow into the first mass flow of fluid from the fuel line from which the first mass flow of fluid flows into the jet nozzle, wherein the third mass flow is injected at a second plurality of positions disposed mutually offset in an axial direction around a circumference of the jet nozzle.   
     
     
         30 . The method as claimed in  claim 29 , wherein a plurality of different radial fuel distributions are implemented. 
     
     
         31 . The method as claimed in  claim 28 , wherein the second mass flow of fluid is injected into the first mass flow of fluid at a second plurality of positions around the circumference of the jet nozzle. 
     
     
         32 . The method as claimed in  claim 29 , wherein the second mass flow of fluid is injected into the first mass flow of fluid at a second plurality of positions around the circumference of the jet nozzle. 
     
     
         33 . The method as claimed in  claim 32 , wherein the second mass flow of fluid is injected into the first mass flow of fluid at the second plurality of positions disposed mutually offset in the axial direction around the circumference of the jet nozzle. 
     
     
         34 . The method as claimed in  claim 28 , wherein the second mass flow of fluid is an air/fuel mixture. 
     
     
         35 . The method as claimed in  claim 28 , wherein the second and/or the third mass flow of fluid is injected into the first mass flow of fluid at an angle of between 0° and 90°. 
     
     
         36 . The method as claimed in  claim 35 ,
 wherein the second mass flow of fluid is injected into the first mass flow of fluid at the angle of 90°, and   wherein the third mass flow of fluid is injected into the first mass flow of fluid at the angle of 45°.   
     
     
         37 . A burner, comprising:
 a jet nozzle with a main fluid inlet opening and a fluid outlet opening,   wherein the main fluid inlet opening is connected to a first fluid supply line which is an air supply line,   wherein fuel may be injected into the jet nozzle either via a fuel nozzle which is disposed in or immediately preceding the main fluid inlet opening or via a first secondary fluid inlet opening connected to a fluid supply line, the first fluid inlet is disposed in an axial position on the jet nozzle downstream of the main fluid inlet opening, and   wherein a plurality of second secondary fluid inlet openings are connected to the first fluid supply line and disposed at a plurality of positions disposed in a mutually offset manner in an axial direction along a circumference of the jet nozzle.   
     
     
         38 . A burner, comprising:
 a jet nozzle with a main fluid inlet opening and a fluid outlet opening,   wherein the main fluid inlet opening is connected to a first fluid supply line which is an air supply line,   wherein fuel may be injected into the jet nozzle either via a fuel nozzle which is disposed in or immediately preceding the main fluid inlet opening, or via first secondary fluid inlet opening connected to a fluid supply line from a radial position of the jet nozzle with respect to a circumference of the jet nozzle, and   wherein a plurality of second secondary fluid inlet openings are connected to the first fluid supply line and disposed at a first plurality of positions disposed in a mutually offset manner in an axial direction along the circumference of the jet nozzle.   
     
     
         39 . The burner as claimed in  37 , wherein the plurality of first fluid inlet openings or the plurality of second secondary fluid inlet openings are disposed at a second plurality of positions along the circumference of the jet nozzle. 
     
     
         40 . The burner as claimed in  claim 39 , wherein the plurality of first fluid inlet openings or the plurality of second secondary fluid inlet openings are disposed at the second plurality of positions disposed in a mutually offset manner along the circumference of the jet nozzle. 
     
     
         41 . The burner as claimed in  claims 37 ,
 wherein the plurality of first secondary fluid inlet openings or the plurality of second secondary fluid inlet openings and the main fluid inlet opening each include a central axis, and   wherein the plurality of central axes of the plurality of first fluid inlet opening or the plurality of second secondary fluid inlet openings are at an angle of between 0° and 90° to the central axis of the main fluid inlet opening and/or to the central axis of the jet nozzle.   
     
     
         42 . The burner as claimed in  claim 41 ,
 wherein the plurality of central axes of a first portion of the plurality of first or second secondary fluid inlet openings are at the angle of 90° to the central axis of the main fluid inlet opening and/or to the central axis of the jet nozzle, and   wherein the plurality of central axes of a second portion of the plurality of first or second secondary fluid inlet openings are at an angle of 45° to the central axis of the main fluid inlet opening and/or to the central axis of the jet nozzle.   
     
     
         43 . The burner as claimed in  claim 37 ,
 wherein the plurality of first or second secondary fluid inlet openings and the main fluid inlet opening each include a central axis, and   wherein the plurality of central axes of the plurality of first or second secondary fluid inlet openings are at the angle of between 0° and 90° to a radial direction with respect to the central axis of the main fluid inlet opening.   
     
     
         44 . The burner as claimed in  claim 37 , wherein a plurality of fluid supply lines connected to the plurality of first secondary fluid inlet openings are interconnected via an annular distributor disposed along the circumference of the jet nozzle. 
     
     
         45 . The burner as claimed in  claim 37 ,
 wherein the fuel nozzle comprises a fuel distributor which is disposed in or immediately preceding the main fluid inlet opening.   
     
     
         46 . The burner as claimed in  claim 37 , wherein the second secondary fluid inlet opening is implemented as an annular gap running along the circumference of the jet nozzle. 
     
     
         47 . The burner as claimed in  claim 46 ,
 wherein the burner is implemented as a jet burner and comprises a plurality of jet nozzles, and   wherein a plurality of annular gaps of the plurality of different jet nozzles are disposed at different axial positions in each case.