Hollow jet injector for liquid fuel

Abstract

The invention relates to a liquid fuel spray injector comprising a liquid fuel intake duct and a spray fluid intake duct, said liquid fuel intake duct comprising an element perforated with oblique channels for shaping said fuel into a hollow rotating jet before ejection from said injector, characterized in that the generatrix of each of said channels makes an angle of less than 10° with the liquid fuel intake direction. The injector is intended to form part of a burner, in particular for glass furnaces. The injector serves to obtain a significant reduction of NOx.

1 - 10 . (canceled) 
   
   
       11 . A liquid fuel spray injector comprising:
 a liquid fuel intake duct; and   a spray fluid intake duct;   the liquid fuel intake duct comprising an element perforated with oblique channels for shaping the fuel into a hollow rotating jet before ejection from the injector,   wherein a generatrix of each of the channels makes an angle of less than 10° with the liquid fuel intake direction.   
   
   
       12 . The injector as claimed in  claim 11 , wherein the generatrix of each of the channels makes an angle of between 2° and 8° with the fuel intake direction. 
   
   
       13 . The injector as claimed in  claim 12 , wherein an outer face of the liquid fuel intake duct is in a same plane as an outer face of the injector. 
   
   
       14 . The injector as claimed in  claim 13 , wherein the spray fluid intake duct is placed concentrically around the liquid fuel intake duct, the liquid fuel intake duct terminating in a nozzle for ejecting the liquid fuel through its outer face, the spray fluid intake duct terminating in a block drilled with an orifice ejecting the spray fluid, at least part of the nozzle being inserted into the block, and the outer face of the nozzle being aligned in the plane of the outer face of the block and onto which the orifice opens. 
   
   
       15 . A burner comprising an injector as claimed in  claim 11 . 
   
   
       16 . The burner as claimed in  claim 15 , further comprising an inlet for air or oxygen-enriched air having a cross-sectional area of between 0.5 and 3 m 2 . 
   
   
       17 . A furnace comprising a burner as claimed in  claim 15 . 
   
   
       18 . The furnace as claimed in  claim 17 , as an end-fired furnace. 
   
   
       19 . A method for heat treating a glass melt, wherein the glass melt is heated in a furnace as claimed in  claim 18 . 
   
   
       20 . The use of the injector or of the burner as claimed in  claim 11 , for heating a glass melt.