Burner with adjustable flue gas recirculation

Abstract

The invention relates to a burner (B) for firing a combustion chamber, having a supply duct (Z 1 ) for supplying combustion gas or combustion air into the combustion chamber, wherein the burner (B) has an inlet opening (E) via which flue gas ( 4 ) can flow into the supply duct (Z 1 ). To be able to adjust the flow rate of the flue gas ( 4 ) flowing into the supply duct (Z 1 ), the burner (B) comprises an adjustable throttle device (D).

1 . A burner (B) for firing a combustion chamber, with a feed duct (Z 1 ) for feeding fuel gas or combustion air into the combustion chamber, wherein the burner (B) has an inlet opening (E), via which flue gas ( 4 ) may flow into the feed duct (Z 1 ), characterized in that it comprises an adjustable throttle apparatus (D), by means of which the mass flow rate of the flue gas ( 4 ) flowing into the feed duct (Z 1 ) is adjustable. 
     
     
         2 . The burner as claimed in  claim 1 , characterized in that the throttle apparatus (D) is operable from outside the combustion chamber when the burner is in the installed state. 
     
     
         3 . The burner as claimed in  claim 1 , characterized in that the throttle apparatus (D) is operable manually or by means of an adjusting drive. 
     
     
         4 . The burner as claimed in  claim 1 , characterized in that the throttle apparatus (D) consists wholly or in part of refractory material and/or ceramic fibers and/or a high temperature metal. 
     
     
         5 . The burner as claimed in  claim 1 , characterized in that the throttle apparatus (D) comprises a disk (P) arranged so as to be movable lengthwise in the feed duct (Z 1 ), the cross sectional shape of which disk largely corresponds to the shape of the clear cross section of the feed duct (Z 1 ) and which narrows the inlet opening (E) to a greater or lesser extent depending on its position. 
     
     
         6 . The burner as claimed in  claim 1 , characterized in that the throttle apparatus (D) comprises a rotary slide valve mounted rotatably about the longitudinal axis of the feed duct (Z), rotation of which may narrow the inlet opening (E) to a greater or lesser extent.