Method and device for the purification of diesel exhaust gases

F - Mech Eng,Light,Heat,Weapons – 01 – N

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F01N 3/021 (2006.01) B01D 53/94 (2006.01) F01N 3/025 (2006.01) F01N 3/035 (2006.01) F01N 3/20 (2006.01) F01N 3/28 (2006.01) F01N 9/00 (2006.01) F02B 37/02 (2006.01)

Patent

CA 2729063

The invention proposes a method for the purification of exhaust gases which are generated by a diesel engine with a charging turbine, and a special device for carrying out said method. The device comprises, in the flow direction of the exhaust gas, a dosing device for a reducing agent from a reducing agent reservoir (2), an SCR catalytic converter (3), an oxidation catalytic converter (4) and a diesel particle filter (5). The system is particularly suitable for the purification of the exhaust gases of diesel vehicles in which engines with a turbocharger (charging turbine (1)) and an exhaust- gas recirculation device are used, which en-gines generate exhaust gases which, in addition to carbon monoxide, hydrocarbons and particles, have nitrogen oxides with an NO2/NO x ratio of between 0.3 and 0.7.

L'invention concerne un procédé dépuration des gaz déchappement générés par un moteur diesel muni dune turbine de suralimentation, ainsi quun dispositif spécial destiné à réaliser ledit procédé. Le dispositif comprend, dans la direction découlement du gaz déchappement, un dispositif doseur pour un agent réducteur provenant dun réservoir (2) dagent réducteur, un convertisseur catalytique (3) à SCR, un convertisseur catalytique (4) à oxydation et un filtre (5) à particules pour diesel. Le système convient tout particulièrement à lépuration des gaz déchappement des véhicules diesel utilisant des moteurs équipés dun turbocompresseur (turbine (1) de suralimentation) et dun dispositif de recirculation des gaz déchappement, lesdits moteurs générant des gaz déchappement qui, en plus du monoxyde de carbone, des hydrocarbures et des particules, contiennent des oxydes dazote avec un rapport NO2/NOX compris entre 0,3 et 0,7.

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