Fluid injection lance with balanced flow distribution

Abstract

An injector configured to introduce a reductant into an exhaust stream, the injector includes: a body including a conduit with a first diameter, a nozzle fluidly coupled to the conduit and disposed at a distal end of the body, and an extension extending from the distal end of the body, the extension extending from the distal end of the body by at least a distance equal to the first diameter.

What is claimed is: 
     
         1 . An injector configured to introduce a reductant into an exhaust stream, the injector comprising:
 a body including a conduit with a first diameter;   a nozzle fluidly coupled to the conduit and disposed at a distal end of the body; and   an extension extending from the distal end of the body, the extension extending from the distal end of the body by at least a distance equal to the first diameter.   
     
     
         2 . The injector assembly of  claim 1 , wherein the body extends in a first direction and the extension extends in a second direction substantially parallel to the first direction. 
     
     
         3 . The injector assembly of  claim 2 , further comprising a cross-member coupled to the body and extending in a third direction substantially perpendicular to the first direction. 
     
     
         4 . The injector assembly of  claim 2 , further comprising a ring mixer coupled to the body. 
     
     
         5 . The injector assembly of  claim 4 , wherein the ring mixer is disposed with a center of the ring mixer axially aligned with a center of the nozzle. 
     
     
         6 . The injector assembly of  claim 1 , wherein at least one of the body and the extension includes a teardrop-shaped cross-section. 
     
     
         7 . The injector assembly of  claim 1 , wherein the extension is fluidly isolated from the body. 
     
     
         8 . The injector assembly of  claim 1 , wherein the nozzle extends in a fourth direction substantially perpendicular to the first direction. 
     
     
         9 . The injector assembly of  claim 1 , wherein the nozzle includes only a single nozzle. 
     
     
         10 . An aftertreatment module for treating constituents of exhaust gases of an internal combustion engine, the aftertreatment module comprising:
 a housing;   an injector disposed within the housing, the injector including:
 a body coupled to the housing and including a conduit with a first diameter; 
 a nozzle fluidly coupled to the conduit of the body and disposed at a distal end of the body; and 
 an extension extending from the distal end of the body, the extension extending from the distal end of the body by at least a distance equal to the first diameter; and 
   a mixing duct disposed downstream of the injector and within the housing.   
     
     
         11 . The aftertreatment module of  claim 10 , wherein the body extends in a first direction and the extension extends in a second direction substantially parallel to the first direction. 
     
     
         12 . The aftertreatment module of  claim 11 , wherein the body and extension together extend a distance equal to substantially an entire diameter of the mixing duct. 
     
     
         13 . The aftertreatment module of  claim 11 , further comprising a cross-member coupled to the body and extending in a third direction substantially perpendicular to the first direction. 
     
     
         14 . The aftertreatment module of  claim 11 , further comprising a ring mixer coupled to the body. 
     
     
         15 . The aftertreatment module of  claim 10 , further including a diffuser disposed upstream of the mixing duct. 
     
     
         16 . The aftertreatment module of  claim 10 , wherein the body and extension together extend less than a distance equal to substantially an entire diameter of the mixing duct. 
     
     
         17 . The aftertreatment module of  claim 10 , further comprising a header fluidly coupled to the internal reductant conduit of the body of the injector. 
     
     
         18 . The aftertreatment module of  claim 10 , further comprising at least one selective catalytic reduction catalyst disposed downstream of the mixing duct. 
     
     
         19 . The aftertreatment module of  claim 10 , wherein the injector is disposed within the mixing duct. 
     
     
         20 . An injector configured to introduce a reductant into an exhaust stream, the injector comprising:
 a body;   a nozzle fluidly coupled to, and disposed at a distal end of, the body; and   an extension extending from the distal end of the body, the extension configured to equalize a velocity of exhaust flow over the nozzles in at least two directions.