Cyclone particulate filtration for lean burn engines
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01N-003/00
F01N-003/021
F01N-003/027
F01N-003/037
출원번호
US-0204304
(2014-03-11)
등록번호
US-9260995
(2016-02-16)
발명자
/ 주소
Patchett, Joseph A.
Huennekes, Edgar V.
출원인 / 주소
BASF Corporation
대리인 / 주소
Womble Carlyle Sandridge & Rice, LLP
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
Provided is a particulate filtration apparatus for removing combustible and noncombustible particulate matter from a lean burn engine exhaust gas stream containing particulate matter. The apparatus comprises a cyclone body with a roughened surface on the inner walls designed to trap and agglomerate
Provided is a particulate filtration apparatus for removing combustible and noncombustible particulate matter from a lean burn engine exhaust gas stream containing particulate matter. The apparatus comprises a cyclone body with a roughened surface on the inner walls designed to trap and agglomerate the combustible particulate matter. A catalyst, selected from a selective catalytic reduction catalyst, an ammonia oxidation catalyst, a hydrolysis catalyst, an oxidation catalyst, a three-way catalyst, and combinations thereof can be coated on the roughened surface. Also provided is a system and methods for treating an exhaust gas stream.
대표청구항▼
1. A particulate filtration apparatus for removing combustible and noncombustible particulate matter from a lean burn engine exhaust gas stream containing particulate matter, the apparatus comprising: a cyclone body having an upper portion and a conical section contiguous with the upper portion;an i
1. A particulate filtration apparatus for removing combustible and noncombustible particulate matter from a lean burn engine exhaust gas stream containing particulate matter, the apparatus comprising: a cyclone body having an upper portion and a conical section contiguous with the upper portion;an inlet in the upper portion to place the exhaust gas containing particulate matter in flow communication with the upper portion of the cyclone body, the cyclone body having an inner wall providing a surface facing an interior of the cyclone body, wherein the surface of the inner wall is a roughened surface designed to trap and agglomerate the combustible particulate matter on the inner wall, and wherein the roughened surface extends from the upper portion of the cyclone body into the conical section;an outlet in flow communication with and downstream from the cyclone body;a particulate collector adjacent to the conical section of the cyclone body, wherein the combustible particulate matter is forced against the inner wall by centrifugal force and down to the particulate collector; anda particulate matter incinerator to combust the combustible particulate matter trapped on the roughened surface of the inner walls of the inlet or trapped in the particulate collector. 2. The particulate filtration apparatus of claim 1, wherein the roughened surface has a k value greater than 0.5. 3. The particulate filtration apparatus of claim 1, wherein the roughened surface is in the form of a coating applied to the surface of the inner wall. 4. The particulate filtration apparatus of claim 3, wherein the coating is a plasma-sprayed or arc-sprayed coating. 5. The particulate filtration apparatus of claim 1, further comprising a catalyst on the roughened surface of the inner wall of the cyclone body. 6. The particulate filtration apparatus of claim 5, wherein the roughened surface provides a locally higher gas pressure at the roughened surface and the chemical reaction for which the catalyst is selected is such that the reaction proceeds at a different rate because of the locally higher gas pressures adjacent to the roughened surface. 7. The particulate filtration apparatus of claim 5, wherein the catalyst is selected from the group consisting of a selective catalytic reduction catalyst, an ammonia oxidation catalyst, a hydrolysis catalyst, an oxidation catalyst, a three-way catalyst, and combinations thereof. 8. The particulate filtration apparatus of claim 1, wherein the inner wall comprises a ceramic, a metal, a composite, or combinations thereof. 9. The particulate filtrate apparatus of claim 1, wherein at least a portion of the inner wall is porous. 10. The particulate filtration apparatus of claim 1, wherein the particulate matter incinerator comprises a heater that produces temperatures sufficient to combust the particulate matter. 11. The particulate filtration apparatus of claim 10, wherein the particulate matter incinerator comprises catalytic material to promote the combustion of the particulate matter. 12. A system for purifying the exhaust gas stream of a lean burn engine, the system comprising the particulate filtration apparatus of claim 1 and at least one catalytic article upstream or downstream of the particulate filtration apparatus. 13. The system of claim 12, further comprising a wall flow filter. 14. The system of claim 13, wherein the wall flow filter includes at least one catalytic material. 15. The system of claim 14, wherein said at least one catalytic article is disposed upstream of the particulate filtration apparatus and the wall flow filter. 16. The system of claim 14, wherein the wall flow filter is a wall flow filter having greater than 90% filtration efficiency on a mass basis. 17. The system of claim 14, further comprising a catalyst on the roughened surface of the inner wall of the cyclone body. 18. The system of claim 12, wherein the outlet is in flow communication with an exhaust gas conduit that directs exhaust gas that has been filtered through the apparatus out of the system through an outlet end. 19. The system of claim 18, wherein at least a portion of the exhaust gas that has been filtered through the apparatus is directed through an exhaust gas recirculation valve that redirects the exhaust gas that has been filtered through the system. 20. The particulate filtration apparatus of claim 5, wherein there are multiple cyclone bodies connected to common inlet and outlet manifolds. 21. The system of claim 17, wherein the catalyst on the roughened surface of the inner wall comprises a selective catalytic reduction catalyst for the reduction of oxides of nitrogen in the presence of a reductant. 22. A particulate filtration apparatus for removing combustible and noncombustible particulate matter from a lean burn engine exhaust gas stream containing particulate matter, the apparatus comprising: a cyclone body having an upper portion and a conical section contiguous with the upper portion;an inlet in the upper portion to place the exhaust gas containing particulate matter in flow communication with the upper portion of the cyclone body, the cyclone body having an inner wall providing a surface facing an interior of the cyclone body, wherein the surface of the inner wall is a roughened surface designed to trap and agglomerate particulate matter on the inner wall, and wherein the roughened surface extends from the upper portion of the cyclone body into the conical section and wherein at least a portion of the inner wall of the upper portion is both roughened and porous such that at least a portion of the exhaust gas is filtered through the porous inner wall;a first outlet in flow communication with the interior of the cyclone body;a second outlet to extract a portion of the filtered gas through the porous surface, the outlet in flow communication with and downstream from the cyclone body;a particulate collector adjacent to the conical section of the cyclone body, wherein the combustible particulate matter is forced against the inner wall by centrifugal force and down to the particulate collector; anda particulate matter incinerator to combust the combustible particulate matter trapped on the roughened and porous surface of the inner walls of the cyclone body or trapped in the particulate collector. 23. The particulate filtration apparatus of claim 22, wherein the cyclone body comprises a catalyst on the roughened and porous surface of the inner wall of the cyclone body. 24. The particulate filtration apparatus of claim 23, wherein the chemical reaction for which the catalyst was selected is such that the reaction benefits from the locally higher gas pressures adjacent to the roughened and porous surface. 25. The particulate filtration apparatus of claim 23, wherein the catalyst is selected from a selective catalytic reduction catalyst, an ammonia oxidation catalyst, a hydrolysis catalyst, an oxidation catalyst, a three-way catalyst, and combinations thereof. 26. The particulate filtration apparatus of claim 22, wherein the inner wall comprises a ceramic, a metal, a composite, or combinations thereof. 27. The particulate filtration apparatus of claim 22, wherein the particulate matter incinerator comprises a heater that produces temperatures sufficient to combust the particulate matter. 28. The particulate filtration apparatus of claim 27, wherein the particulate matter incinerator comprises catalytic material to promote the combustion of the particulate matter. 29. The particulate filtration apparatus of claim 23, wherein there are multiple cyclone bodies connected to common inlet and outlet manifolds. 30. The particulate filtration apparatus of claim 29, wherein the catalyst comprises a selective catalytic reduction catalyst for the reduction of oxides of nitrogen in the presence of a reductant. 31. A system for purifying the exhaust gas steam of a lean burn engine, the system comprising the particulate filtration apparatus of claim 22 and at least one catalytic article upstream or downstream the particulate filtration apparatus. 32. The system of claim 31, further comprising a wall flow filter. 33. The system of claim 32, wherein the wall flow filter includes at least one catalytic material. 34. The system of claim 33, wherein said at least one catalytic article is disposed upstream of the particulate filtration apparatus and the wall flow filter. 35. The system of claim 32, wherein the wall flow filter is a wall flow filter having greater than 90% filtration efficiency on a mass basis. 36. The system of claim 32, wherein the inner walls of the cyclone body comprise a catalytic material disposed thereon. 37. The system of claim 31, wherein at least a portion of the exhaust gas that has been filtered through the apparatus is directed through an exhaust gas recirculation valve that redirects the exhaust gas that has been filtered through the system.
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이 특허에 인용된 특허 (10)
Miller Jan D. (Salt Lake City UT), Air-sparged hydrocyclone and method.
Spence ; deceased Billy F. (8202 Research Blvd. ; No. 207 late of Houston TX) Spence ; legal representative by Eva L. (8202 Research Blvd. ; No. 207 Austin TX 78758) Balandrano ; deceased Jesus F. (l, Multi stage gas scrubber.
Pence Dallas T. (Idaho Falls ID) Thomas Thomas R. (Idaho Falls ID), Reduction of nitrogen oxides with catalytic acid resistant aluminosilicate molecular sieves and ammonia.
Speronello Barry K. (Belle Mead NJ) Byrne John W. (Edison NJ) Chen James M. (Edison NJ), Staged metal-promoted zeolite catalysts and method for catalytic reduction of nitrogen oxides using the same.
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