Device and method for injecting a mixing gas into an exhaust line

Abstract

A device for injecting a mixing gas into an exhaust gas exhaust line of an engine, the device comprising: one or more inlet openings, a plurality of walls comprising: o a first wall (31) and; o a second wall (32) having one or more outlet openings and being arranged downstream of the first wall, and means (36) for injecting the mixing gas between the first wall and the second wall, so as to allow the mixing gas and the exhaust gases to be mixed between the first wall and the second wall.

1 . A device for injecting a mixing gas into an exhaust gas exhaust line of an engine, the device comprising:
 one or more inlet openings,   a plurality of walls comprising:
 a first wall, and 
 a second wall having one or more outlet openings and positioned downstream of the first wall, and 
   injection means of the mixing gas between the first wall and the second wall, so as to allow mixing of the mixing gas and the exhaust gases between the first wall and the second wall.   
     
     
         2 . The device according to  claim 1 , wherein the plurality of walls comprises at least one intermediate wall positioned between the first wall and the second wall, the intermediate wall comprising one or more openings. 
     
     
         3 . The device according to  claim 1 , comprising means for bypassing at least one zone, at one opening at least, configured to form a fluid communication between at least one opening of a wall of the plurality of walls upstream of the zone with at least one opening of a wall of the plurality of walls downstream of the zone without passing through the zone. 
     
     
         4 . The device according to  claim 1 , also comprising a lateral wall connecting the first wall and the second wall and delimiting with the first wall and the second wall an interior space, the injection device being adapted to be positioned inside the exhaust line, so as to allow the passage of exhaust gases between the lateral wall and the wall of the exhaust line. 
     
     
         5 . The device according to  claim 4 , wherein the device comprises means for attaching the device to the exhaust line. 
     
     
         6 . The device according to  claim 1 , the device forming a section of the exhaust line, in particular the device comprising a lateral wall connecting the first wall and the second wall and delimiting with the first wall and the second wall an interior space so that the lateral wall is in contact with the exhaust line and/or forms a portion of the wall of the exhaust line. 
     
     
         7 . The device according to  claim 5 , comprising mixing gas supply means of the injection means, the attachment means comprising the supply means. 
     
     
         8 . The device according to  claim 1 , wherein the first wall or the lateral wall has one or more of the one or more inlet openings. 
     
     
         9 . The device according to  claim 1 , wherein the injection means are positioned at the first wall or extend between the first wall and the second wall from the first wall. 
     
     
         10 . The device according to  claim 1 , wherein, for at least one wall of the plurality of walls, the dimensions of the openings or the total empty surface or the total empty surface density or the total empty volume density or the quantity of openings vary(ies). 
     
     
         11 . The device according to  claim 1 , wherein the dimensions of the openings or the total empty surface or the total empty surface density or the total empty volume density or the quantity of openings of at least one wall vary(ies) with respect to at least one other wall of the plurality of walls. 
     
     
         12 . An assembly comprising an engine and/or an exhaust gas exhaust line of the engine, the assembly comprising a device according  claim 1 . 
     
     
         13 . The assembly according to  claim 12 , comprising a selective catalytic reduction system for exhaust gases, or an oxidation catalyst. 
     
     
         14 . A method for injecting a mixing gas into an exhaust gas exhaust line of an engine implemented by means of a device according to  claim 1 , comprising the following steps:
 entry of the exhaust gases between the first wall and the second wall,   injection of the mixing gas between the first wall and the second wall,   mixing the entered exhaust gases and the injected mixing gas,   output of the mixed exhaust gases and the mixing gas by at least one opening of the second wall.