Device and method for purification of exhaust gases from an...

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

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F01N 3/20 (2006.01)

Patent

CA 2611027

The invention relates to a device and method for purification of exhaust gases from an internal combustion engine (10), with an exhaust system (12), comprising a NOx-catalyst (14) and a reducing agent introduction device (16), embodied to introduce reducing agent into the exhaust system (12) before the NOx-catalyst (14). According to the invention, the reducing agent introduction device (16) comprises a reformer (18), embodied to convert the exhaust gas exiting the internal combustion engine (10) and fuel into a reformate serving as a reducing agent. The invention further relates to a method for purification of exhaust gases from an internal combustion engine (10), in which a reducing agent is supplied to a NOx-catalyst (14) in an exhaust system (12), whereby reformate generated by a reformer (18) is used as reducing agent and the reformer (18) generates the reformate from exhaust gas exiting the internal combustion engine (10) and fuel.

Dispositif de purification des gaz d'échappement d'un moteur à combustion interne (10), qui comporte un système d'échappement (12) pourvu d'un catalyseur de NOx (14), et un dispositif d'introduction d'agent de réduction (16) conçu pour l'introduction d'un agent de réduction dans le système d'échappement (12) avant le catalyseur de NOx (14). Selon la présente invention, le dispositif d'introduction d'agent de réduction (16) comporte un reformeur (18) conçu pour convertir les gaz d'échappement et le carburant sortant du moteur à combustion interne (10) en un reformat servant d'agent de réduction. La présente invention concerne en outre un procédé de purification de gaz d'échappement d'un moteur à combustion interne (10) selon lequel un agent de réduction est introduit dans un catalyseur de NOx (14) situé dans un système d'échappement. Selon la présente invention, le reformat produit par un reformeur (18) est utilisé en tant qu'agent de réduction, ledit reformeur (18) produisant le reformat à partir de gaz d'échappement émis par le moteur à combustion interne (10), et de carburant.

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