Filter assembly for an exhaust gas purification system
A filter assembly for an exhaust gas purification system of an internal combustion engine. The filter assembly, has porous filter plate elements, connected with each other on their outer as well as on their inner peripheries, forming in pairs as filter pockets. Catalytic agents such as ammonia are applied to the filter pockets on the outer and/or inner sides to oxidize carbon black contained in the combustion gas. In particular, this filter assembly is compact and can be used for diesel engines of motor vehicles.
1. A filter assembly for an exhaust gas purification system of an internal combustion engine of a motor vehicle comprising:
(a) a plurality of filter plate elements arranged alternately parallel to each other and coupled to each other on their outer and inner periphery thereby forming in pairs, a plurality of filter pockets, said plurality of filter pockets having outer and inner sides and outer and inner apexes and being arranged one after another in a main direction of an exhaust gas flow; and,
wherein said plurality of filter plate elements which are formed as sintered metal filter plate rings are shaped as dishes;
(b) a plurality of catalytic agents with at least one catalytic agent associated with at least one side of said at least one of said plurality of filter pockets.
2. The filter assembly as in claim 1 , wherein said plurality of filter plate elements have a central passage.
3. The filter assembly as in claim 1 , wherein said plurality of catalytic agents are associated with said outer sides of said plurality of filter pockets and act as an oxidation catalyst.
4. The filter assembly as in claim 2 , wherein said plurality of catalytic agents are associated with said outer sides of said plurality of filter pockets and act as an oxidation catalyst.
5. The filter assembly as in claim 1 , wherein said plurality of catalytic agents are associated with said inner sides of said plurality of filter pockets and comprise a catalyst material supporting the reduction of nitrogen oxide.
6. The filter assembly as in claim 2 , wherein said plurality of catalytic agents are associated with said inner sides of said plurality of filter pockets and comprise a catalyst material supporting the reduction of nitrogen oxide.
7. The filter assembly as in claim 3 , wherein said plurality of catalytic agents are associated with said inner sides of said plurality of filter pockets and comprise a catalyst material supporting the reduction of nitrogen oxide.
8. The filter assembly as in claim 4 , wherein said plurality of catalytic agents are associated with said inner sides of said plurality of filter pockets and comprise a catalyst material supporting the reduction of nitrogen oxide.
9. The filter assembly as in claim 3 , wherein said plurality of catalytic agents are catalytically active foils coupled to at least one of said plurality of filter plate elements on said inner apexes and project into said outer side of said plurality of filter pockets.
10. The filter assembly as in claim 4 , wherein said plurality of catalytic agents are catalytically active foils coupled to at least one of said plurality of filter plate elements on said inner apexes and project into said outer side of said plurality of filter pockets.
11. The filter assembly as in claim 5 , wherein said plurality of catalytic agents are catalytically active foils coupled to at least one of said plurality of filter plate elements on said outer apexes and project into said inner side of said plurality of filter pockets.
12. The filter assembly as in claim 6 , wherein said plurality of catalytic agents are catalytically active foils coupled to at least one of said plurality of filter plate elements on said outer apexes and project into said inner side of said plurality of filter pockets.
13. The filter assembly as in claim 7 , wherein said plurality of catalytic agents are catalytically active foils coupled to at least one of said plurality of filter plate elements on said inner and outer apexes and project into said outer and inner sides of said plurality of filter pockets.
14. The filter assembly as in claim 8 , wherein said plurality of catalytic agents are catalytically active foils coupled to at least one of said plurality of filter plate elements on said inner and outer apexes and project into said outer and inner sides of said plurality of filter pockets.
15. The filter assembly as in claim 9 , wherein said catalytically active foils have a metering means for feeding a reducing agent.
16. The filter assembly as in claim 10 , wherein said catalytically active foils have a metering means for feeding a reducing agent.
17. The filter assembly as in claim 11 , wherein said catalytically active foils have a metering means for feeding a reducing agent.
18. The filter assembly as in claim 12 , wherein said catalytically active foils have a metering means for feeding a reducing agent.
19. The filter assembly as in claim 13 , wherein said catalytically active foils have a metering means for feeding a reducing agent.
20. The filter assembly as in claim 14 , wherein said catalytically active foils have a metering means for feeding a reducing agent.