Tall vertical scr

Abstract

An exhaust aftertreatment system including an exhaust conduit transmitting exhaust from an engine, a reductant introduction system introducing a reductant into the exhaust, and a selective catalytic reduction catalyst (SCR) receiving the exhaust and reductant. A SCR length divided by a SCR width is greater than 4. A SCR cell density is less than 180 cells per square inch of cross-sectional area of the SCR. The SCR is vertically mounted adjacent a corner of a cab of a machine.

What is claimed is: 
     
         1 . A exhaust aftertreatment system comprising:
 an exhaust conduit transmitting exhaust from an engine;   a reductant introduction system introducing a reductant into the exhaust; and   a selective catalytic reduction catalyst (SCR) receiving the exhaust and reductant, wherein a SCR length divided by a SCR width is greater than 4.   
     
     
         2 . The exhaust aftertreatment system of  claim 1  wherein the SCR includes a plurality of cells with a cell density of less than 180 cells per square inch of cross-sectional area of the SCR. 
     
     
         3 . The exhaust aftertreatment system of  claim 1  wherein the SCR includes a plurality of cells with a cell density of between 130 and 180 cells per square inch of cross-sectional area of the SCR. 
     
     
         4 . The exhaust aftertreatment system of  claim 3  wherein the SCR length is between 3 and 4 feet. 
     
     
         5 . The exhaust aftertreatment system of  claim 1  wherein the SCR is vertically mounted on a machine. 
     
     
         6 . The exhaust aftertreatment system of  claim 5  wherein the reductant introduction system introduces the reductant into a horizontal section of the exhaust conduit. 
     
     
         7 . The exhaust aftertreatment system of  claim 5  wherein the SCR is mounted adjacent a corner of a cab. 
     
     
         8 . The exhaust aftertreatment system of  claim 5  wherein the SCR includes a metallic substrate. 
     
     
         9 . The exhaust aftertreatment system of  claim 5  further including a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF) upstream of the SCR and a clean-up catalyst downstream of the SCR. 
     
     
         10 . A exhaust aftertreatment system comprising:
 an exhaust conduit transmitting exhaust from an engine;   a reductant introduction system introducing a reductant into the exhaust; and   a selective catalytic reduction catalyst (SCR) receiving the exhaust and reductant, wherein the SCR includes a plurality of cells with a cell density of less than 180 cells per square inch of cross-sectional area of the SCR.   
     
     
         11 . The exhaust aftertreatment system of  claim 1  wherein a SCR length divided by a SCR width is greater than 4. 
     
     
         12 . The exhaust aftertreatment system of  claim 11  wherein the SCR includes a plurality of cells with a cell density of between 130 and 180 cells per square inch of cross-sectional area of the SCR. 
     
     
         13 . The exhaust aftertreatment system of  claim 11  wherein the SCR length is between 3 and 4 feet. 
     
     
         14 . The exhaust aftertreatment system of  claim 11  wherein the SCR is vertically mounted on a machine. 
     
     
         15 . The exhaust aftertreatment system of  claim 14  wherein the reductant introduction system introduces the reductant into a horizontal section of the exhaust conduit. 
     
     
         16 . The exhaust aftertreatment system of  claim 14  wherein the SCR is mounted adjacent a corner of a cab. 
     
     
         17 . The exhaust aftertreatment system of  claim 14  wherein the SCR includes a metallic substrate. 
     
     
         18 . The exhaust aftertreatment system of  claim 14  further including a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF) upstream of the SCR and a clean-up catalyst downstream of the SCR. 
     
     
         19 . A machine comprising:
 an exhaust conduit transmitting exhaust from an engine;   a reductant introduction system introducing a reductant into the exhaust; and   a selective catalytic reduction catalyst (SCR) receiving the exhaust and reductant, wherein the SCR is vertically mounted adjacent a corner of a cab of the machine.   
     
     
         20 . The exhaust aftertreatment system of  claim 19  wherein a SCR length divided by a SCR width is greater than 4 and the SCR includes a plurality of cells with a cell density of less than 180 cells per square inch of cross-sectional area of the SCR.