Engine Exhaust After-Treatment System

Abstract

An engine exhaust after-treatment system including an exhaust passage; an exhaust treatment component housing communicating with the exhaust passage; a pair of baffles spaced apart within the housing; a plurality of exhaust treatment devices positioned between the pair of baffles, each exhaust treatment device including a canister; a plurality of restraining devices fixed between the pair of baffles for positioning each of the canisters between the baffles, each restraining device including at least a portion thereof that is angled relative to an outer surface of the canister such that ends of the restraining device abut the outer surface of the canister at the first end and prevent radial movement of the canister; and a soot blower positioned in the housing upstream of the exhaust treatment devices, the soot blower for dispersing particulate matter deposited on each of the exhaust treatment devices.

1 . An exhaust after-treatment component, comprising:
 a housing;   a pair of baffles spaced apart within the housing;   a canister including an exhaust treatment substrate positioned between the pair of baffles, the canister including a first end and a second end; and   a plurality of restraining devices fixed between the pair of baffles for positioning the canister between the baffles, each restraining device including a first portion spaced apart from an outer surface of the canister and a second portion abutting the outer surface of the canister at the first end and preventing radial movement of the canister.   
     
     
         2 . The exhaust treatment component of  claim 1 , wherein a second end of the canister is bolted to one of the baffles. 
     
     
         3 . The exhaust treatment component of  claim 1 , wherein the exhaust treatment substrate is an SCR substrate. 
     
     
         4 . The exhaust treatment component of  claim 1 , further comprising a particulate matter dispersion device within the housing. 
     
     
         5 . The exhaust treatment component of  claim 4 , wherein the particulate matter dispersion device includes a plurality of nozzle lines, each nozzle line including a plurality of nozzles for dispersing particulate matter deposited on the exhaust treatment substrate. 
     
     
         6 . The exhaust treatment component of  claim 1 , wherein a plurality of canisters are supported between the baffles in an array. 
     
     
         7 . The exhaust treatment component of  claim 6 , wherein each canister corresponds to a plurality of restraining devices that position the canisters between the baffles. 
     
     
         8 . The exhaust treatment component of  claim 1 , wherein the restraining devices abut the canister at an inlet side of the housing. 
     
     
         9 . The exhaust treatment component of  claim 1 , wherein the first portion of the restraining device forms an angle α relative to the outer surface of the canister in the range of 1 to 20 degrees, inclusive. 
     
     
         10 . The exhaust treatment component of  claim 9 , wherein α is in the range of 5 to 15 degrees, inclusive. 
     
     
         11 . The exhaust treatment component of  claim 10 , wherein α is in the range of 5 to 10 degrees, inclusive. 
     
     
         12 . An engine exhaust after-treatment system, comprising:
 an exhaust passage;   an exhaust treatment component housing communicating with the exhaust passage;   a pair of baffles spaced apart within the housing;   a plurality of exhaust treatment devices positioned between the pair of baffles, each exhaust treatment device including a canister;   a plurality of restraining devices fixed between the pair of baffles for positioning each of the canisters between the baffles, each restraining device including a first portion spaced apart from an outer surface of the canister and a second portion engaging the outer surface of the canister to prevent radial movement of the canister; and   a soot blower positioned in the housing upstream of the exhaust treatment devices, the soot blower for dispersing particulate matter deposited on each of the exhaust treatment devices.   
     
     
         13 . The exhaust after-treatment system of  claim 12 , wherein a second end of the canisters is bolted to one of the baffles. 
     
     
         14 . The exhaust after-treatment system of  claim 12 , wherein the exhaust treatment devices each include an SCR substrate. 
     
     
         15 . The exhaust after-treatment system of  claim 12 , wherein the soot blower includes a plurality of nozzle lines, each nozzle line including a plurality of nozzles. 
     
     
         16 . The exhaust after-treatment system of  claim 12 , wherein the restraining devices abut the canisters at an inlet side of the housing. 
     
     
         17 . The exhaust after-treatment system of  claim 12 , wherein the first portion of the restraining device forms an angle α relative to the outer surface of the canister in the range of 1 to 20 degrees, inclusive. 
     
     
         18 . The exhaust after-treatment system of  claim 12 , further comprising a bypass pipe that directs exhaust gases around the exhaust treatment component housing. 
     
     
         19 . The exhaust after-treatment system of  claim 18 , wherein a first valve is disposed within the bypass pipe, and a second valve is positioned at an inlet of exhaust treatment component housing. 
     
     
         20 . The exhaust treatment component system of  claim 19 , wherein when the first valve is open, the second valve is closed.