Exhaust after treatment system and method for treating exhaust

Abstract

In one exemplary embodiment of the invention an exhaust after treatment system is provided that includes an inlet housing, an inlet in the inlet housing configured to receive an exhaust gas flow from an internal combustion engine and an outlet in the inlet housing configured to direct the exhaust gas flow to a pollutant reduction device. The system also includes a deflector coupled to an inner surface of the inlet housing, the deflector configured to receive the exhaust gas flow from the inlet and uniformly direct the exhaust flow through the outlet and to the pollutant reduction device.

1 . An exhaust gas after treatment system comprising:
 an inlet housing;   an inlet in the inlet housing configured to receive an exhaust gas flow from an internal combustion engine;   an outlet in the inlet housing configured to direct the exhaust gas flow to a pollutant reduction device disposed in the exhaust gas after treatment system; and   a deflector coupled to an inner surface of the inlet housing, the deflector configured to receive the exhaust gas flow from the inlet and uniformly direct the exhaust gas flow through the outlet and to the pollutant reduction device.   
     
     
         2 . The system of  claim 1 , comprising a plurality of deflectors extending substantially perpendicularly from the inner surface. 
     
     
         3 . The system of  claim 2 , comprising wherein the plurality of deflectors comprise curved members. 
     
     
         4 . The system of  claim 1 , comprising a side deflector extending from a side wall of the elliptical shaped housing. 
     
     
         5 . The system of  claim 1 , wherein the housing comprises an elliptical shape housing. 
     
     
         6 . The system of  claim 1 , wherein a first exhaust gas flow direction through the inlet is substantially perpendicular to a second exhaust gas flow direction through the outlet. 
     
     
         7 . The system of  claim 1 , wherein the deflector is configured to uniformly direct the exhaust gas flow through the outlet with a uniformity index greater than about 0.85. 
     
     
         8 . The system of  claim 1 , wherein the pollutant reduction device comprises an oxidation catalyst. 
     
     
         9 . The system of  claim 1 , wherein the inlet is configured to receive an exhaust gas flow from a turbocharger of the internal combustion engine. 
     
     
         10 . The system of  claim 1 , wherein the elliptical shaped housing is formed by stamping. 
     
     
         11 . The system of  claim 1 , wherein the deflector is coupled to the inner surface by a brazing or welding process. 
     
     
         12 . A method for treating exhaust gas from an internal combustion engine, the method comprising:
 receiving an exhaust gas flow from the internal combustion engine via an inlet in a housing;   directing the exhaust gas flow to form a uniform exhaust flow to an outlet of the housing; and   directing the uniform exhaust flow to a pollutant reduction device.   
     
     
         13 . The method of  claim 12 , wherein directing the exhaust gas flow comprises deflecting the exhaust gas flow via a plurality of deflectors extending perpendicular from an inner surface of the housing. 
     
     
         14 . The method of  claim 13 , wherein directing the exhaust gas flow comprises deflecting the exhaust gas flow via a side deflector extending from a side wall of the housing. 
     
     
         15 . The method of  claim 13 , wherein directing the exhaust gas flow comprises deflecting the exhaust gas flow via the plurality of deflectors comprising a plurality of curved members. 
     
     
         16 . The method of  claim 12 , wherein the housing comprises an elliptical shape housing. 
     
     
         17 . The method of  claim 12 , wherein receiving the exhaust gas flow comprises receiving the exhaust gas flow in a first flow direction through the inlet that is substantially perpendicular to a second gas flow direction through the outlet. 
     
     
         18 . The method of  claim 12 , wherein deflecting the exhaust gas flow comprises directing the uniform exhaust gas flow through the outlet with a uniformity index greater than about 0.85. 
     
     
         19 . The method of  claim 12 , wherein directing the uniform exhaust gas flow comprises directing the uniform exhaust flow to an oxidation catalyst. 
     
     
         20 . The method of  claim 12 , wherein receiving the exhaust gas flow comprises receiving the exhaust gas flow from a turbocharger of the internal combustion engine.