Apparatus and method for desulfation of a catalyst used in a lean burn methane source fueled combustion system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01N-003/08
F01N-003/20
F01N-009/00
F01N-011/00
B01J-038/04
F02B-043/10
B01D-053/96
B01D-053/94
F01N-003/10
F01N-003/36
출원번호
US-0438029
(2017-02-21)
등록번호
US-10184374
(2019-01-22)
발명자
/ 주소
Han, Xue
Nunan, John
출원인 / 주소
UMICORE AG & CO. KG
대리인 / 주소
Smith, Gambrell & Russell, LLP
인용정보
피인용 횟수 :
0인용 특허 :
13
초록▼
Apparatus for reactivating a sulfur poisoned oxidation catalyst operating in exhaust of a lean burn, methane source fueled combustion device. Reactivation includes desulfation of the poisoned catalyst through a CO supplementation apparatus communicating with the control unit that is adapted to suppl
Apparatus for reactivating a sulfur poisoned oxidation catalyst operating in exhaust of a lean burn, methane source fueled combustion device. Reactivation includes desulfation of the poisoned catalyst through a CO supplementation apparatus communicating with the control unit that is adapted to supplement CO content in exhaust reaching the catalyst, while avoiding an overall rich exhaust atmosphere at the catalyst (e.g., an added supply of hydrocarbons to one or more-of the lean burn engine's combustion chambers as by an ECU controlled extra supply of NG to some of the combustion chambers). Also featured is a method for desulfation of an oxidation catalyst of a lean burn CNG engine by supplying excess CO to exhaust reaching the catalyst while retaining an overall lean state, and a method of assembling an apparatus for reactivating a sulfur deactivated lean burn NG engine catalyst by assembling a CO supplementation apparatus with control unit.
대표청구항▼
1. An apparatus for catalytic treatment of exhaust from a lean burn, methane sourced fuel combustion device, comprising: an exhaust line adapted for receipt of exhaust from the combustion device;a catalyst positioned for contact with exhaust traveling in the exhaust line;a methane level sensor downs
1. An apparatus for catalytic treatment of exhaust from a lean burn, methane sourced fuel combustion device, comprising: an exhaust line adapted for receipt of exhaust from the combustion device;a catalyst positioned for contact with exhaust traveling in the exhaust line;a methane level sensor downstream of the catalyst;a control unit;a CO supplementation apparatus in communication with the control unit and adapted to supplement CO content in the exhaust reaching the catalyst, while avoiding an overall rich exhaust atmosphere at the catalyst, so as to desulfate the catalyst, andwherein the catalyst is a Pd-based catalyst. 2. The apparatus of claim 1 wherein the catalyst comprises Pd and at least a second metal. 3. The apparatus of claim 2 wherein the second metal is Pt. 4. The apparatus of claim 1 wherein the CO supplementation apparatus supplements the CO exhaust content by adding fuel to the CO supplementation apparatus during a combustion state in the combustion device while retaining an overall lean burn state at the catalyst during CO supplementation. 5. The apparatus of claim 4 wherein the CO supplementation apparatus operates such that the lean state of the exhaust reaching the catalyst during supplementation is retained at or greater than lambda 1.1. 6. The apparatus of claim 5 wherein the CO supplementation apparatus operates such that the percentage of CO content in the exhaust is 1.0% to <7.5% during supplementation. 7. The apparatus of claim 1 wherein the CO supplementation apparatus provides a percentage of CO content in the exhaust that is 2.0% to 6.0% CO during supplementation and while the exhaust is in a lean state at the catalyst. 8. The apparatus of claim 7 wherein the CO supplementation apparatus provides a CO content in the exhaust that is 2.5 to 4.0% CO by volume during supplementation and while the exhaust is in a lean state at the catalyst. 9. The apparatus of claim 1 wherein the CO supplementation apparatus includes a fuel injector device. 10. The apparatus of claim 9 wherein the combustion device comprises a lean burn engine and the fuel injector device of the CO supplementation apparatus supplies less than a total number of combustion chambers of the lean burn engine with added fuel. 11. The apparatus of claim 9 wherein the combustion device comprises a lean burn engine and the fuel injector device is in communication with the control unit and is adapted to add fuel to one or more combustion chambers of the lean burn engine. 12. The apparatus of claim 11 wherein the fuel injector device feeds a fuel in common with an operation fuel of the lean burn engine. 13. The apparatus of claim 1 further comprising a catalyst sulfur deactivation sensor in communication with the control unit. 14. The apparatus of claim 13 wherein the deactivation sensor conveys information to the control unit informative of a level of sulfur deactivation of the catalyst, and, when the control unit determines a threshold value of sulfur deactivation has occurred, initiates the CO supplemental apparatus to supplement the exhaust flow with added CO. 15. The apparatus of claim 14 wherein the initiation of the CO supplementation apparatus includes the triggering of an additional supply of methane source fuel through one or more valves opened by the control unit. 16. The apparatus of claim 1 wherein the catalyst has Pd alone as PGM material or Pd/Pt in a Pd/Pt ratio of 3:1 to 10:1 as the PGM material. 17. A method of assembling the catalytic treatment apparatus of claim 1, comprising: providing the catalyst in the exhaust line so as to be positioned for contact with the exhaust of the lean burn combustion device, andsetting up the control unit for control communication with the CO supplementation apparatus. 18. A system for rejuvenation of a catalyst, comprising: the apparatus of claim 1;the lean burn, methane sourced fuel combustion device; anda natural gas fuel source as a methane sourced fuel to be supplied to the combustion device, andwherein exhaust from the combustion device is received in said exhaust line. 19. The system of claim 18 wherein the natural gas fuel source is a CNG fuel source and the combustion device is an engine of a moveable vehicle. 20. The system of claim 18 wherein the combustion device is a stationary power plant boiler. 21. An apparatus for catalytic treatment of exhaust from a lean burn, methane sourced fuel combustion device, comprising: an exhaust line adapted for receipt of exhaust from the methane sourced fuel combustion device;a catalyst positioned for contact with exhaust traveling in the exhaust line;a methane level sensor downstream of the catalyst;a control unit;CO supplementation means, in communication with the control unit, for supplementation of CO content in the exhaust reaching the catalyst, while avoiding an overall rich exhaust atmosphere at the catalyst, so as to desulfate the catalyst, andwherein the catalyst is a Pd-based catalyst. 22. The apparatus of claim 21 wherein the catalyst is positioned in the exhaust line as to be a first in line catalyst to receive supplemental CO generated by the CO supplementation means. 23. An apparatus for catalytic treatment of exhaust from a lean burn, methane sourced fuel combustion device, comprising: an exhaust line adapted for receipt of exhaust from the combustion device;a catalyst positioned for contact with exhaust traveling in the exhaust line;a methane level sensor downstream of the catalyst;a control unit;a CO supplementation apparatus in communication with the control unit and adapted to supplement CO content in the exhaust reaching the catalyst, while avoiding an overall rich exhaust atmosphere at the catalyst, so as to desulfate the catalyst, andwherein the CO supplementation apparatus operates such that the lean state of the exhaust reaching the catalyst during supplementation is retained at or greater than lambda 1.1. 24. A method of enhancing a catalyst performance in a lean burn, methane source fueled combustion device, comprising: monitoring methane breakthrough downstream of the catalyst; andsupplementing to a predetermined level CO content of the lean burn combustion device exhaust through the use of a control unit in response to the breakthrough so as to rejuvenate the catalyst while retaining an overall lean burn state in the exhaust reaching the catalyst during CO supplementation. 25. The method of claim 24 wherein the CO percentage by volume is 2.5% to 4.0% CO during supplementation while retaining the exhaust gas at an overall lean state at the catalyst during CO supplementation. 26. The method of claim 24 wherein the catalyst is a Pd-based catalyst. 27. The method of claim 26 wherein the rejuvenation includes supplementing CO content reaching the catalyst so as to have CO percentage by volume of 2.0% to 6.0% CO during supplementation while retaining the exhaust gas at an overall lean state at the catalyst during CO supplementation. 28. The method of claim 26 wherein the rejuvenation includes desulfation of the Pd inclusive catalyst by way of the CO supplementation, and the Pd based catalyst has Pd alone as PGM material or Pd/Pt in a Pd/Pt ratio of 3:1 to 10:1 as the PGM material. 29. The method of claim 24 wherein the CO supplementation is carried out by supplying additional fuel to one or more combustion chambers of the methane source fueled combustion device in the form of a lean burn engine of a mobile vehicle. 30. The method of claim 29 wherein the CO supplementation is carried out by supplying a fuel source, that is also used as a fuel source for normal engine running, to less than all available combustion chambers of the lean burn engine. 31. The method of claim 30 herein the methane source fuel is CNG.
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이 특허에 인용된 특허 (13)
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Subramanian Somasundaram (Melvindale MI) Kudla Robert J. (Warren MI) Chattha Mohinder S. (Northville MI), Exhaust treating system for lean-burn CNG engine.
Subramanian Somasundaram (Melvindale MI) Kudla Robert J. (Warren MI) Chattha Mohinder S. (Northville MI), Exhaust treating system for lean-burn CNG engine.
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Hancu, Dan; Lewis, Larry Neil; Winkler, Benjamin Hale; Norton, Daniel George, System and method for controlling nitrous oxide emissions of an internal combustion engine and regeneration of an exhaust treatment device.
Subramanian Somasundaram (Melvindale MI) Watkins William L. H. (Toledo OH) Chattha Mohinder S. (Northville MI), Three-way catalyst for treating emissions from compressed natural gas fueled engines.
Subramanian Somasundaram (Melvindale MI) Watkins William L. H. (Toledo OH) Chattha Mohinder S. (Northville MI), Treating emissions from engines fueled by compressed natural gas.
Subramanian Somasundaram (Melvindale MI) Kudla Robert J. (Warren MI) Chattha Mohinder S. (Northville MI), Treating exchaust from a compressed natural gas-fueled engine.
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