International Engine Intellectual Property Company, LLC
대리인 / 주소
Keller, Paul V.
인용정보
피인용 횟수 :
1인용 특허 :
11
초록▼
A soot resistant and efficient diesel fuel reformer for a diesel exhaust aftertreatment system has serially arranged first and second catalyst supports. The first support is nearer the inlet and has a monolith structure that is uniform in the direction of flow. The second support has a modified mono
A soot resistant and efficient diesel fuel reformer for a diesel exhaust aftertreatment system has serially arranged first and second catalyst supports. The first support is nearer the inlet and has a monolith structure that is uniform in the direction of flow. The second support has a modified monolith structure that is non-uniform in the direction of flow. Preferably, the first support has straight channels. Preferably, the second support has internal leading edges spaced periodically through its length to break up the flow. The first support has a catalyst coating comprising at least an oxidation catalyst. The second support has a catalyst coating comprising at least a steam reforming catalyst.
대표청구항▼
1. A diesel exhaust aftertreatment system, comprising: an exhaust conduit having an upstream inlet and a downstream outlet;a fuel reformer within the conduit, the fuel reform comprising serially arranged first and second catalyst supports, the first support being nearer the inlet;wherein the first s
1. A diesel exhaust aftertreatment system, comprising: an exhaust conduit having an upstream inlet and a downstream outlet;a fuel reformer within the conduit, the fuel reform comprising serially arranged first and second catalyst supports, the first support being nearer the inlet;wherein the first support has a monolith structure that is uniform lengthwise;the second support has a modified monolith structure providing a multiplicity of internal leading edges periodically spaced through its length;the first support has a catalyst coating comprising at least an oxidation catalyst; andthe second support has a catalyst coating comprising at least a steam reforming catalyst. 2. The diesel exhaust aftertreatment system of claim 1, wherein the exhaust aftertreatment system has a peak flow capacity;the uniform structure of the first support causes a fully developed laminar flow to form within its channels when the exhaust flow is at the peak of the system's capacity; andthe modified structure of the second support prevents a fully developed laminar flow from forming within its channels when the exhaust flow is at the peak of the system's capacity. 3. The diesel exhaust aftertreatment system of claim 1, further comprising a lean NOX trap positioned within the conduit downstream from the fuel reformer; anda diesel particulate filter positioned within the conduit, downstream from the fuel reformer. 4. The diesel exhaust aftertreatment system of claim 1, wherein the fuel reformer has a peak flow capacity and the modified monolith structure repeats in the direction of flow with a frequency less than two times a hydrodynamic entry length at the peak flow capacity for a straight channel monolith having a cross-section corresponding to a cross-section of the modified monolith structure. 5. The diesel exhaust aftertreatment system of claim 1, wherein the first support structure defines channels that are straight. 6. The diesel exhaust aftertreatment system of claim 1, wherein the second support is a monolith structure defining channels and is modified by a secondary structure providing valleys and troughs with a height below that of the channels. 7. The diesel exhaust aftertreatment system of claim 6, wherein the valleys and troughs a height less than ⅓ that of the channels. 8. The diesel exhaust aftertreatment system of claim 1, wherein the first and second supports are formed by layered metal foils, at least some of which are contiguous between the first and second lengths. 9. The diesel exhaust aftertreatment system of 8, wherein the first and second supports are formed from one set of metal foils, whereby the hydraulic diameters of the first and second support are nearly equal. 10. The diesel exhaust aftertreatment system of claim 1, wherein the first support has a hydraulic diameter substantially greater than that of the second support. 11. A diesel exhaust aftertreatment system, comprising: an exhaust conduit having an upstream inlet and a downstream outlet;a fuel reformer positioned within the conduit between the inlet and the outlet, the fuel reform comprising one or more catalyst supports the catalysts supports having distinct first and second catalyst support structures, the first support structure being manifest nearer the inlet than the second support structure;a first catalyst coating comprising at least an oxidation catalyst over a portion of the support having the first catalyst structure; anda second catalyst coating comprising at least a steam reforming catalyst over a portion of the support having the second catalyst structure;wherein the first support structure defines a first structured array of exhaust flow channels having a first mean flow direction and a first hydraulic diameter, the cross-section of the first support structure perpendicular to the first mean flow direction being uniform along the first mean flow direction for a length at least ten times the first mean hydraulic diameter; andthe second support structure defines a second structured array of exhaust flow channels having a second mean flow direction and a second hydraulic diameter, the cross-section of the second support structure perpendicular to the second primary flow direction varying in a repeating pattern along the second mean flow direction with a period of repetition less than ten times the second mean hydraulic diameter. 12. The diesel exhaust aftertreatment system of 11, wherein the cross-section of the second support structure perpendicular to the second primary flow direction provides internal leading edges. 13. The diesel exhaust aftertreatment system of 11, wherein the cross-section of the first support structure is constant along the first flow direction throughout its length, whereby the first support structure provides an exhaust flow that is essentially in one direction throughout once beyond an entrance region where the flow is develops. 14. The diesel exhaust aftertreatment system of 11, wherein exhaust flow channels defined by the second structure have valleys and troughs with a height below that of the channels themselves. 15. The diesel exhaust aftertreatment system of 11, wherein exhaust flow channels defined by the second structure has valleys and troughs with a height less than ⅓ the second hydraulic diameter. 16. The diesel exhaust aftertreatment system of 11, wherein the first and second structures are formed by layered metal foils, at least some of which are contiguous between the first and second lengths. 17. The diesel exhaust aftertreatment system of 16, wherein the first and second structures are formed from one set of metal foils, whereby the first and second hydraulic diameters are nearly equal. 18. The diesel exhaust aftertreatment system of 11, wherein the first hydraulic diameter is substantially greater than the second hydraulic diameter. 19. The diesel exhaust aftertreatment system of 11, further comprising: a lean NOX trap; anda diesel particulate filter, both positioned within the exhaust conduit downstream from the fuel reformer.
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이 특허에 인용된 특허 (11)
Nonnenmann Manfred (Schwieberdingen DEX), Carrier matrix for a catalytic reactor for the purification of exhaust gas.
Maus Wolfgang (Bergisch Gladbach DEX) Swars Helmut (Bergisch Gladbach DEX) Wieres Ludwig (Overath DEX), Honeycomb body with internal leading edges, in particular a catalyst body for motor vehicles.
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