Burner for Powdered and/or Particulate Fuels with Adjustable Swirl

Abstract

A burner for powdered and/or particulate fuels having a flow channel for transporting at least one gas stream into a combustion chamber, wherein the flow channel has an annular cross section and a swirl device imparting a swirl to the gas stream in a circumferential direction. The swirl device has at least a first and a second group of deflection means to generate the swirl, that at least the second group of deflection means is attached in a fixed manner to supporting structure that is axially displaceable along the flow channel and/or can be rotated about the longitudinal axis of the flow channel in order to alter the swirl.

1 . A burner for powdered and/or particulate fuels, comprising:
 a flow channel for transporting at least one gas stream into a combustion chamber,   wherein the flow channel has an annular cross section and a swirl device imparting a swirl to the gas stream in a circumferential direction, wherein   the swirl device has at least one first and one second group of deflection means distributed over the circumference of the flow channel to generate the swirl,   at least the second group of deflection means is attached in a fixed manner relative to each other on a supporting structure, and   the supporting structure is axially displaceable along the flow channel and/or is provided so as to be rotatable about the longitudinal axis of the flow channel in order to alter the swirl imparted.   
     
     
         2 . The burner according to  claim 1 ,
 wherein, in order to impart the swirl in the circumferential direction, the deflection means have guide surfaces inclined towards the longitudinal direction of the flow channel.   
     
     
         3 . The burner according to  claim 1 ,
 wherein the deflection means are configured as guide vanes and/or guide plates.   
     
     
         4 . The burner according to  claim 1 , wherein the flow channel is configured in the shape of a hollow cylinder. 
     
     
         5 . The burner according to  claim 1 , wherein the flow channel is delimited by an inner tube, preferably core tube, and an outer, in particular concentric, tube, preferably primary tube. 
     
     
         6 . The burner according to  claim 1 , wherein a fuel supply is provided for feeding powdered or particulate fuel into the flow channel. 
     
     
         7 . The burner according to  claim 1 , wherein in a first position of at least the second group of deflection means, adjacent deflection means in the first and second group of deflection means are aligned flush with one another and that in a second position of at least the second group of deflection means the adjacent deflection means in the first and second group of deflection means are arranged offset relative to one another. 
     
     
         8 . The burner according to  claim 1 , wherein the deflection means in the second group of deflection means continue into the deflection means in the first group of deflection means and/or vice versa. 
     
     
         9 . The burner according to  claim 1 , wherein, in a first position of at least the second group of deflection means, adjacent deflection means of at least the first group of deflection means and the second group of deflection means have a larger free flow section for the gas stream in a longitudinal direction of the flow channel than in a second position of the at least second group of deflection means. 
     
     
         10 . The burner according to  claim 1 , wherein in a position of at least the second group of deflection means, the deflection means in the first group of deflection means and the second group of deflection means form joint deflection channels and/or flow channels inclined towards the longitudinal direction of the flow channel. 
     
     
         11 . The burner according to  claim 1 , wherein, in a position of at least the second group of deflection means, the deflection means in the first group of deflection means and the second group of deflection means form separate deflection channels and/or flow channels inclined towards the longitudinal direction of the flow channel. 
     
     
         12 . The burner according to  claim 1 , wherein the swirl device has at least a third group of deflection means distributed over the circumference of the flow channel to generate the swirl. 
     
     
         13 . The burner according to  claim 12 , wherein
 the third group of deflection means is attached in a fixed manner relative to each other on a further supporting structure, and   the supporting structure for altering the imparted swirl is axially displaceable along the flow channel and/or is provided so as to be rotatable about the longitudinal axis of the flow channel.   
     
     
         14 . The burner according to  claim 1 , wherein the first group of deflection means is provided in a fixed manner in the flow channel. 
     
     
         15 . The burner according to  claim 1 , wherein the supporting structure is configured as annular.