Improved exhaust treatment system

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

Patent

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F01N 3/20 (2006.01) B01D 53/94 (2006.01) F01N 3/02 (2006.01) F01N 3/021 (2006.01) F01N 3/033 (2006.01) F01N 3/04 (2006.01) F01N 3/28 (2006.01) F28G 9/00 (2006.01) F01N 13/14 (2010.01) F02B 3/06 (2006.01)

Patent

CA 2120033

An improved exhaust treatment apparatus includes a particulate filter assembly (18) connected to the exhaust system of a diesel engine (12) for removing the solid particulate soot matter entrained in the engine exhaust. The particulate filter assembly (18) includes a disposable low-temperature filter element (60) that can be readily replaced when it becomes clogged. Heat insulat- ed catalyst assemblies (26) located upstream of the particulate filter assembly (18) reduce the amounts of solid particulate matter and other gaseous pollutants in the engine exhaust. A self-cleaning exhaust gas heat exchanger (14) located between the catalyst assemblies (26) and the particulate filter cools the hot, catalyzed exhaust gases before they reach the low temperature filter ele- ment (60). The self-cleaning heat exchanger (14) also includes an intermittent water injection system (24) for periodically remov- ing soot accumulations from the heat exchanger (14).

urificateur d'émissions amélioré comprenant un ensemble filtre à particules (18) raccordé au système d'échappement d'un moteur diesel (12) afin d'enlever les particules de suie solides entraînées dans les gaz d'échappement. L'ensemble filtre à particules (18) comprend un filtre jetable agissant à basse température (60), facile à remplacer lorsqu'il est encrassé. Des ensembles calorifugés pour catalyse (26) situés en amont du filtre à particules (18) réduisent la quantité de particules solides et d'autres polluants gazeux présents dans les gaz d'échappement du moteur. Un échangeur de chaleur des gaz d'échappement autonettoyant (14), situé entre les ensembles pour catalyse (26) et le filtre à particules, refroidit les gaz d'échappement chauds catalysés avant qu'ils n'atteignent l'élément filtre agissant à basse température (60). L'échangeur (14) comprend également un dispositif d'injection intermittente d'eau (24) pour l'enlèvement périodique de la suie qui se dépose sur l'échangeur (14).

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