Particle separator and method for removing particles from an exhaust gas stream of an internal combustion engine
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-045/00
B01D-046/00
B01D-053/92
B01D-053/94
출원번호
UP-0487572
(2009-06-18)
등록번호
US-7850934
(2011-02-10)
우선권정보
DE-10 2008 029 521(2008-06-21)
발명자
/ 주소
Döring, Andreas
출원인 / 주소
MAN Nutzfahrzeuge AG
대리인 / 주소
Becker, Robert W.
인용정보
피인용 횟수 :
7인용 특허 :
8
초록▼
A particle separator and method for removing particles from an exhaust gas stream of an internal combustion engine. Differing flow regions having different flow conditions are formed in the particle separator. The differing flow regions are configured such that essentially particles having different
A particle separator and method for removing particles from an exhaust gas stream of an internal combustion engine. Differing flow regions having different flow conditions are formed in the particle separator. The differing flow regions are configured such that essentially particles having different, defined sizes and/or masses are adapted to be separated out of the exhaust gas stream in the differing flow regions. The exhaust gas stream is adapted to flow through at least portions of the particle separator.
대표청구항▼
What I claim is: 1. A particle separator for removing particles from an exhaust gas stream of an internal combustion engine, wherein differing flow regions having different flow conditions are formed in said particle separator, further wherein said differing flow regions are configured such that es
What I claim is: 1. A particle separator for removing particles from an exhaust gas stream of an internal combustion engine, wherein differing flow regions having different flow conditions are formed in said particle separator, further wherein said differing flow regions are configured such that essentially particles having different, defined sizes and/or masses are adapted to be separated out of the exhaust gas stream in said differing flow regions, and wherein the exhaust gas stream is adapted to flow through at least portions of said particle separator, wherein said differing flow regions are spatially separated from one another in said particle separator for an essentially separate removal of defined very fine particles essentially by diffusion, and of defined larger and/or heavier coarse particles based on their mass moment of inertia. 2. A particle separator according to claim 1, wherein said differing flow regions differ from one another with respect to at least one of flow velocity and retention time of the exhaust gas stream in said flow regions. 3. A particle separator according to claim 1, wherein for forming said differing flow regions, said particle separator is provided with means for effecting at least one of accelerating and slowing down the exhaust gas stream in said particle separator. 4. A particle separator according to claim 3, wherein said means comprises differently sized free flow cross-sections of said differing flow regions. 5. A particle separator according to claim 4, wherein as viewed in a direction of flow of the exhaust gas stream, said different flow regions are disposed one after another and/or next to one another and/or over one another. 6. A particle separator according to claim 5, further comprising means for repeatedly deflecting the exhaust gas stream in said particle separator and/or for dividing the exhaust gas stream into partial exhaust gas streams. 7. A particle separator according to claim 6, wherein said differing flow regions are arranged in such a way that a partial exhaust gas stream of said exhaust gas stream that flows through a first one of said differing flow regions with a defined flow velocity and/or a defined retention time, flows into a second one of said differing flow regions that differs from said first flow region relative to flow velocity and/or retention time of the exhaust gas stream. 8. A particle separator according to claim 7, wherein a plurality of groups of differing flow regions are provided, and wherein the flow regions of each group have an essentially identical configuration. 9. A particle separator according to claim 7, wherein at least portions of adjacent, preferably differing, flow regions, as viewed in the direction of flow, are offset relative to one another in such a way that a discharge opening of a first one of said flow regions forms an intake opening of a second one of said flow regions, which differs relative to said first flow region. 10. A particle separator according to claim 5, wherein said different flow regions form a plurality of flow channels, further wherein at least a portion of said flow channels, in particular relative to an opening cross-section thereof, are oriented transverse to the direction of flow of the exhaust gas stream and/or are provided with flow-through openings formed in a lateral flow channel wall region, and wherein at least a portion of said flow channels are in flow communication via said flow-through openings. 11. A particle separator according to claim 10, wherein at least a portion of said flow-through openings differ with respect to their shape and/or size, especially along a direction of flow of the exhaust gas stream. 12. A particle separator according to claim 1, wherein at least one of a particle collection device and a storage device is associated with each of said differing flow regions. 13. A particle separator according to claim 12, wherein said particle collector and/or particle storage device is formed by a storage space or blind-end bore type clearance volume space. 14. A particle separator according to claim 13, wherein said particle collector and/or particle storage device is formed by a blind-end bore type flow channel section having a baffle base wall that is oriented essentially perpendicular to the exhaust gas stream. 15. A particle separator according to claim 12, wherein said particle collection and/or particle storage device, as viewed in the direction of flow of the exhaust gas stream, is disposed upstream of an intake opening of a respective flow region and/or downstream of a discharge opening of a respective flow region. 16. A particle separator according to claim 12, wherein prescribed portions of said particle collection and/or particle storage device are gas permeable, and wherein in particular prescribed wall portions of said particle collection and/or particle storage device are perforated and/or are made of a gas permeable material. 17. A particle separator according to claim 16, wherein said gas permeability is such that a prescribed quantity of the exhaust gas stream in a respective one of said differing flow regions flows out of said flow region through said particle collection and/or particle storage device. 18. A particle separator according to claim 1, wherein at least portions of said particle separator are catalytically active, by being provided with a catalytic coating. 19. A particle separator according to claim 1, which is formed of a plurality of separator plates that are interconnected in superimposed layers and form a set of plates. 20. A particle separator according to claim 19, wherein individual ones of said separator plates are formed of foils and/or mats having a prescribed thickness. 21. A particle separator according to claim 19, wherein said separator plates are produced of at least one of the group consisting of metallic, ceramic, silicon-containing, silicon carbide-containing, quartz-containing and fiber-containing material. 22. A particle separator according to claim 19, wherein at least portions of said separator plates are provided with a surface structure having a prescribed magnitude of roughness or peak to valley height. 23. A particle separator according to claim 19, wherein said differing flow regions and/or deflection regions and/or separation regions and/or collection regions and/or storage regions and/or flow-through openings are formed by material shaping and/or material deformation and/or material stamping and/or material recessing at prescribed regions of at least a portion of said separator plates of a set of plates. 24. A particle separator according to claim 19, wherein at least a portion of said separator plates of a set of plates has an essentially identical configuration. 25. A particle separator according to claim 19, wherein at least a portion of said set of plates is formed of separator plates that essentially transverse to and/or along a direction of flow of the exhaust gas stream has a corrugated or wavelike configuration and forms a corrugation layer. 26. A particle separator according to claim 25, wherein said separator plates, which form a corrugation layer, are provided with constrictions, wherein said constrictions are spaced from one another in the direction of flow of the exhaust gas stream, further wherein said constrictions extend essentially transverse to the direction of flow, and wherein said constrictions interrupt a corrugated profile, and hence a longitudinal path, of flow channels formed by said corrugated profile. 27. A particle separator according to claim 26, wherein a side portion of said separator plates, that form a corrugation layer, is provided upstream or downstream of each constriction with at least one flow-through opening for the exhaust gas stream. 28. A particle separator according to claim 26, wherein when viewed in the direction of flow, successive ones of said constrictions constrict said corrugated profile alternatingly first from one side and then from an opposite side. 29. A particle separator according to claim 25, wherein said differing flow regions are formed by different amplitudes and/or frequencies of said corrugated profile of at least one separator plate that forms a corrugation layer. 30. A particle separator according to claim 29, wherein said differing flow regions are formed by different amplitudes and/or frequencies of said corrugated profile of different separator plates that form a corrugation layer. 31. A particle separator according to claim 25, wherein said set of plates is provided with planar separator plates that form a smooth layer and that alternate with separator plates that are provided with a corrugated profile and form a corrugated layer. 32. A particle separator according to claim 1, which when viewed in cross-section has a honey-combed structure, and wherein each individual honeycomb thereof represents a flow cross-section of a specific section of a flow channel as viewed in a direction of flow of the exhaust gas stream. 33. A particle separator according to claim 1, wherein at least one of said particle separators, together with at least one catalytic converter, is disposed in a muffler of an exhaust gas unit. 34. A method for removing particles from an exhaust gas stream of an internal combustion engine, including the steps of: passing the exhaust gas stream through at least portions of a particle separator; configuring the particle separator to have differing flow regions having different flow conditions, wherein said differing flow regions are configured such that essentially particles having different, defined sizes and/or masses are adapted to be separated out of the exhaust gas stream in said differing flow regions; defining the flow velocity and/or the retention time of an exhaust gas stream or a partial stream of an exhaust gas stream in said differing flow regions in such a way that in a first group of said flow regions, essentially fine particles having a defined size are removed by diffusion, and in at least one further group of said flow regions, essentially, in contrast to the fine particles, larger and/or heavier coarse particles are removed due to their mass moment of inertia. 35. A method according to claim 34, which includes the further steps of: deflecting an exhaust gas stream, which is in a high velocity flow region and has a prescribed high velocity, in such a way that coarse particles of a specific size and/or weight can no longer follow the exhaust gas stream due to their mass moment of inertia and are removed, by being collected in a particle collection and/or storage device, and slowing down an exhaust gas stream in a low velocity flow region that has a lower flow velocity than exists in said high velocity flow region in such a way that in contrast to said coarse particles smaller and/or lighter fine particles are removed from the exhaust gas stream by diffusion. 36. A method according to claim 34, which includes the further step of oxidizing carbon-containing particles removed in said particle separator with the aid of NO2 formed on a catalyst for oxidation of NO. 37. A method according to claim 34, which includes the further step of raising the temperature of the exhaust gas stream to oxidize carbon-containing particles removed in said particle separator.
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