Exhaust aftertreatment system

Abstract

An exhaust aftertreatment module is provided. The exhaust aftertreatment module includes a housing having a first end and a second end. The at least one inlet is disposed between the first end and the second end and is configured to introduce an exhaust into the housing. A mixing tube is disposed downstream of the at least one inlet. The mixing tube is configured to direct the exhaust towards the second end of the housing. The exhaust aftertreatment module further includes a single bank of Selective Catalytic Reduction (SCR) catalysts disposed at an oblique angle to a longitudinal axis of the mixing tube. The single bank of SCR catalysts is configured to receive the exhaust redirected from the second end of the housing.

What is claimed is: 
     
         1 . An exhaust aftertreatment module comprising:
 a housing having a first end and a second end;   at least one inlet disposed between the first end and the second end, the at least one inlet configured to introduce exhaust into the housing;   a mixing tube disposed downstream of the at least one inlet, the mixing tube configured to direct the exhaust towards the second end of the housing; and   a single bank of Selective Catalytic Reduction (SCR) catalysts disposed at an oblique angle to a longitudinal axis of the mixing tube, the single bank of SCR catalysts configured to receive the exhaust redirected from the second end of the housing.   
     
     
         2 . The exhaust aftertreatment module of  claim 1  further comprising at least one diesel oxidation catalyst (DOC) device disposed proximate to the at least one inlet. 
     
     
         3 . The exhaust aftertreatment module of  claim 1  further comprising a reductant injector located at an inlet of the mixing tube. 
     
     
         4 . The exhaust aftertreatment module of  claim 1  further comprising at least one outlet located downstream of the single bank of SCR catalysts and proximate to the at least one inlet, the at least one outlet configured to allow the exhaust to exit from the housing. 
     
     
         5 . The exhaust aftertreatment module of  claim 1  further comprising a sound attenuation chamber disposed downstream of the at least one inlet and proximate to the mixing tube, the sound attenuation chamber configured to receive the exhaust from the at least one inlet. 
     
     
         6 . The exhaust aftertreatment module of  claim 5 , wherein the sound attenuation chamber comprises a plurality of compartments. 
     
     
         7 . The exhaust aftertreatment module of  claim 6 , wherein at least one of the plurality of compartments has a trapezoidal shaped configuration. 
     
     
         8 . The exhaust aftertreatment module of  claim 7 , wherein at least one of the plurality of compartments has a triangular shaped configuration and is disposed adjacent to and is in fluid communication with the at least one of the plurality of compartments having the trapezoidal shaped configuration. 
     
     
         9 . An exhaust aftertreatment module comprising:
 a housing having a first end and a second end;   at least one inlet disposed between the first end and the second end, the at least one inlet configured to introduce exhaust into the housing;   a sound attenuation chamber disposed downstream of the at least one inlet, the sound attenuation chamber configured to receive the exhaust from the at least one inlet;   a mixing tube disposed downstream of the sound attenuation chamber, the mixing tube configured to direct the exhaust towards the second end of the housing; and   a single bank of Selective Catalytic Reduction (SCR) catalysts disposed at an oblique angle to a longitudinal axis of the mixing tube, the single bank of SCR catalysts configured to receive the exhaust redirected from the second end of the housing.   
     
     
         10 . The exhaust aftertreatment module of  claim 9  further comprising at least one diesel oxidation catalyst (DOC) device disposed between the at least one inlet and the sound attenuation chamber. 
     
     
         11 . The exhaust aftertreatment module of  claim 9  further comprising at least one outlet located downstream of the single bank of SCR catalysts and proximate to the at least one inlet the at least one outlet configured to allow the exhaust to exit from the housing. 
     
     
         12 . The exhaust aftertreatment module of  claim 9 , wherein the sound attenuation chamber comprises a plurality of compartments. 
     
     
         13 . The exhaust aftertreatment module of  claim 12 , wherein at least one of the plurality of compartments has a trapezoidal shaped configuration. 
     
     
         14 . The exhaust aftertreatment module of  claim 13 , wherein at least one of the plurality of compartments has a triangular shaped configuration and is disposed adjacent to and is in fluid communication with the at least one of the plurality of compartments having the trapezoidal shaped configuration. 
     
     
         15 . A method comprising:
 introducing exhaust into at least one inlet disposed between a first end and a second end of a housing;   receiving the exhaust into a mixing tube disposed downstream of the at least one inlet;   directing the exhaust towards the second end of the housing; and   receiving the exhaust redirected from the second end of the housing into a single bank of Selective Catalytic Reduction (SCR) catalysts disposed at an oblique angle to a longitudinal axis of the mixing tube.   
     
     
         16 . The method of  claim 15  further comprising allowing the exhaust to exit from the housing through at least one outlet, the at least one outlet located downstream of the single bank of SCR catalysts and proximate to the at least one inlet. 
     
     
         17 . The method of  claim 15  further comprising receiving the exhaust into a sound attenuation chamber disposed downstream of the at least one inlet and proximate to the mixing tube.