Premixing burner and method for operating a premixing burner

Abstract

A method for operating a premixing burner is provided. The premixing burner includes a premixing zone. An air mass flow and fuel may be injected into the premixing zone, and a potential hot gas backflow area may form. A fluid containing no fuel is injected downstream from the fuel injection into the premixing zone in order that a hot gas backflow area does not form. A premixing burner including a premixing zone is also provided.

1 .- 18 . (canceled) 
     
     
         19 . A method for operating a premixing burner including a premixing zone, the method comprising:
 injecting an air mass flow and fuel into the premixing zone wherein a hot gas flowback region may form; and   injecting a fluid containing no fuel into the premixing zone downstream from the fuel injection.   
     
     
         20 . The method as claimed in  claim 19 ,
 wherein the fluid is injected along a surface of the premixing zone located in the potential hot gas flowback region, and   wherein the fluid is injected in a main direction of air mass flow into the premixing zone.   
     
     
         21 . The method as claimed in  claim 19 , wherein the fuel is injected at right angles to the main direction of air mass flow into the premixing zone. 
     
     
         22 . The method as claimed in  claim 19 ,
 wherein the premixing zone comprises a cone side and a hub side, and   wherein the fuel is injected into the premixing zone on the cone side and/or on the hub side.   
     
     
         23 . The method as claimed in  claim 19 , wherein the fuel is injected into the premixing zone via a swirler vane. 
     
     
         24 . The method as claimed in  claim 19 , wherein the fuel is a syngas. 
     
     
         25 . The method as claimed in  claim 19 , wherein the fluid is air. 
     
     
         26 . The method as claimed in  claim 25 ,
 wherein a proportion of 10 percent of an overall air supplied to the premixing zone is injected along the surface of the premixing zone located in the hot gas flowback region.   
     
     
         27 . The method as claimed in  claim 19 , wherein the fluid is an inert gas. 
     
     
         28 . The method as claimed in  claim 27 , wherein the inert gas is a noble gas, carbon dioxide, water vapor or nitrogen. 
     
     
         29 . A premixing burner, comprising:
 a premixing zone;   an air swirl generator including an air inlet; and   a fuel nozzle,   wherein a fuel may be injected through the fuel nozzle into an air mass flow swirled by the air swirl generator in the premixing zone where a hot gas flowback region may form, and   wherein a surface of the premixing burner in the potential hot gas flowback region includes an opening through which a fluid may be injected into the premixing zone.   
     
     
         30 . The premixing burner as claimed in  claim 29 , wherein the opening is connected in such a way via a fluid channel to the air inlet leading to the air swirl generator that a portion of the air mass flow may be injected through the opening as the fluid into the premixing zone. 
     
     
         31 . The premixing burner as claimed in  claim 29 ,
 wherein the premixing zone comprises a cone side and a hub side, and   wherein the premixing zone also comprises a plurality of fuel nozzles on the cone side and/or the hub side of the premixing zone.   
     
     
         32 . The premixing burner as claimed in  claim 29 , wherein the plurality of fuel nozzles are arranged in one or more rows lying behind one another downstream of the air swirl generator. 
     
     
         33 . The premixing burner as claimed in  claim 29 , wherein the plurality of fuel nozzles and/or a plurality of openings are located in the air swirl generator. 
     
     
         34 . The premixing burner as claimed in  claim 33 ,
 wherein the fuel is injected via a fluid flow channel through the plurality of openings into the premixing zone, and   wherein the plurality of openings are located in a main direction of air mass flow downstream from the plurality of fuel nozzles.   
     
     
         35 . The premixing burner as claimed in  claim 29 , wherein the plurality of fuel nozzles are embodied as a plurality of round holes. 
     
     
         36 . The premixing burner as claimed in  claim 29 , wherein the plurality of fuel nozzles are designed so that the fuel may be injected at right angles to the main direction of air mass flow into the premixing zone. 
     
     
         37 . The premixing burner as claimed in  claim 29 , wherein the fuel is a syngas. 
     
     
         38 . The premixing burner as claimed in  claim 29 ,
 wherein the fluid may be injected into the premixing zone through a plurality of openings in the main direction of air mass flow, and   wherein the fluid is injected into the premixing zone along the surface of the premixing zone.