Method for purification of exhaust gas from a diesel engine

Details Method for purification of exhaust gas from a diesel engine Method for purification of exhaust gas from a diesel engine

F - Mech Eng,Light,Heat,Weapons

01

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F01N 3/025 (2006.01) F01N 3/035 (2006.01) F01N 3/20 (2006.01) F01N 9/00 (2006.01)

Patent

CA 2750013

The invention provides a method for purification of exhaust gas from a diesel engine in a system, which comprises a device for selective catalytic reduction and a diesel particulate filter preferably at least partially covered by a catalytic layer installed downstream of the device for selective catalytic reduction. A device for catalytic oxidation is installed upstream of the device for selective catalytic reduction and/or between the device for selective catalytic reduction and the diesel particulate filter. A device for injection of a controlled amount of reductant is installed inlet of the device for selective catalytic reduction, and a device for injection of a controlled amount of hydrocarbon is installed inlet of the catalytic oxidation.

L'invention concerne un procédé de purification de gaz d'échappement d'un moteur diesel dans un système, comprenant un dispositif pour réduction catalytique sélective et un filtre à particules diesel de préférence couvert au moins partiellement par une couche catalytique se trouvant en aval du dispositif pour réduction catalytique sélective. Un dispositif pour oxydation catalytique est installé en amont du dispositif pour réduction catalytique sélective et/ou entre le dispositif pour réduction catalytique sélective et le filtre à particules diesel. Un dispositif d'injection d'une quantité contrôlée d'agent réducteur est installé à l'entrée du dispositif pour réduction catalytique sélective, et un dispositif d'injection d'une quantité contrôlée d'hydrocarbures est installé à l'entrée de l'oxydation catalytique.

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