Integration of molten carbonate fuel cells in Fischer-Tropsch synthesis
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01M-008/06
F02C-003/22
H01M-008/04
C21B-015/00
C04B-007/36
C01B-003/50
C07C-029/151
C10G-002/00
C07C-001/04
C10K-003/04
H01M-008/14
출원번호
US-0315439
(2014-06-26)
등록번호
US-9077005
(2015-07-07)
발명자
/ 주소
Berlowitz, Paul J.
Barckholtz, Timothy Andrew
Hershkowitz, Frank H.
출원인 / 주소
EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
대리인 / 주소
Carter, Larry E.
인용정보
피인용 횟수 :
0인용 특허 :
47
초록▼
In various aspects, systems and methods are provided for integration of molten carbonate fuel cells with a Fischer-Tropsch synthesis process. The molten carbonate fuel cells can be integrated with a Fischer-Tropsch synthesis process in various manners, including providing synthesis gas for use in pr
In various aspects, systems and methods are provided for integration of molten carbonate fuel cells with a Fischer-Tropsch synthesis process. The molten carbonate fuel cells can be integrated with a Fischer-Tropsch synthesis process in various manners, including providing synthesis gas for use in producing hydrocarbonaceous carbons. Additionally, integration of molten carbonate fuel cells with a Fischer-Tropsch synthesis process can facilitate further processing of vent streams or secondary product streams generated during the synthesis process.
대표청구항▼
1. A method for synthesizing hydrocarbonaceous compounds, the method comprising: introducing a fuel stream comprising a reformable fuel into an anode of a molten carbonate fuel cell, an internal reforming element associated with the anode, or a combination thereof;introducing a cathode inlet stream
1. A method for synthesizing hydrocarbonaceous compounds, the method comprising: introducing a fuel stream comprising a reformable fuel into an anode of a molten carbonate fuel cell, an internal reforming element associated with the anode, or a combination thereof;introducing a cathode inlet stream comprising CO2 and O2 into a cathode inlet of the molten carbonate fuel cell;generating electricity within the molten carbonate fuel cell;generating an anode exhaust comprising H2, CO, H2O, and at least about 20 vol % CO2;reacting at least a portion of the anode exhaust under effective Fischer-Tropsch conditions in the presence of a shifting Fischer-Tropsch catalyst to produce at least one gaseous product and at least one non-gaseous product, wherein a CO2 concentration in the at least a portion of the anode exhaust is at least 80% of a CO2 concentration in the anode exhaust; andrecycling at least a portion of the at least one gaseous product to the cathode inlet. 2. The method of claim 1, wherein a ratio of H2 to CO in the anode exhaust is at least about 2.5:1. 3. The method of claim 1, wherein the recycling step comprises: removing CO2 from the at least one gaseous product to produce a CO2-containing stream and a separated syngas effluent comprising CO2, CO, and H2, such that the CO2-containing stream has a CO2 content greater than a CO2 content in the at least one gaseous product; andrecycling at least a portion of the separated syngas effluent to the cathode inlet. 4. The method of claim 3, further comprising oxidizing the at least a portion of the separated syngas effluent prior to it being recycled to the cathode inlet. 5. The method of claim 1, further comprising compressing the anode exhaust, the at least a portion of the anode exhaust, or a combination thereof prior to the reacting of the at least a portion of the anode exhaust under effective Fischer-Tropsch conditions. 6. The method of claim 1, wherein the shifting Fischer-Tropsch catalyst comprises Fe. 7. The method of claim 1, further comprising exposing at least a portion of the anode exhaust stream to a water gas shift catalyst to form a shifted anode exhaust, and then removing water and CO2 from at least a portion of the shifted anode exhaust. 8. The method of claim 1, wherein the cathode inlet stream comprises exhaust from a combustion turbine. 9. The method of claim 1, wherein the anode exhaust has a ratio of H2:CO of at least about 3.0:1. 10. The method of claim 1, wherein an amount of the reformable fuel introduced into the anode, the internal reforming element associated with the anode, or the combination thereof, is at least about 75% greater than an amount of hydrogen reacted in the molten carbonate fuel cell to generate electricity. 11. The method of claim 1, wherein a ratio of net moles of syngas in the anode exhaust to moles of CO2 in a cathode exhaust is at least about 2.0:1. 12. The method of claim 1, wherein a fuel utilization in the anode is about 50% or less and a CO2 utilization in a cathode is at least about 60%. 13. The method of claim 1, wherein the molten carbonate fuel cell is operated to generate electrical power at a current density of at least about 150 mA/cm2 and at least about 40 mW/cm2 of waste heat, the method further comprising performing an effective amount of an endothermic reaction to maintain a temperature differential between an anode inlet and an anode outlet of about 100° C. or less. 14. The method of embodiment 13, wherein performing the endothermic reaction consumes at least about 40% of the waste heat. 15. The method of claim 1, wherein an electrical efficiency for the molten carbonate fuel cell is between about 10% and about 40% and a total fuel cell efficiency for the molten carbonate fuel cell is at least about 55%. 16. The method of claim 1, wherein the molten carbonate fuel cell is operated at a thermal ratio of about 0.25 to about 1.0. 17. A method for synthesizing hydrocarbonaceous compounds, the method comprising: introducing a fuel stream comprising a reformable fuel into the anode of a molten carbonate fuel cell, an internal reforming element associated with a anode, or a combination thereof;introducing a cathode inlet stream comprising CO2 and O2 into a cathode inlet of the molten carbonate fuel cell;generating electricity within the molten carbonate fuel cell;generating an anode exhaust comprising H2, CO, H2O, and at least about 20 vol % CO2; andreacting at least a portion of the anode exhaust under effective Fischer-Tropsch conditions in the presence of a shifting Fischer-Tropsch catalyst to produce at least one gaseous product and at least one non-gaseous product, wherein a CO2 concentration in the at least a portion of the anode exhaust is at least 80% of a CO2 concentration in the anode exhaust,wherein an amount of the reformable fuel introduced into the anode, the internal reforming element associated with the anode, or the combination thereof, provides a reformable fuel surplus ratio of at least about 1.5. 18. The method of claim 17, further comprising recycling at least a portion of the gaseous product to the anode inlet, the cathode inlet, or a combination thereof. 19. The method of claim 18, wherein the recycling step comprises: removing CO2 from the at least one gaseous product to produce a CO2-containing stream and a separated syngas effluent comprising CO2, CO, and H2; andrecycling at least a portion of the separated syngas effluent to the anode inlet, the cathode inlet, or a combination thereof. 20. The method of claim 19, further comprising oxidizing the at least a portion of the separated syngas effluent prior to the recycling of the separated syngas effluent to the cathode inlet. 21. The method of claim 18, wherein the at least one gaseous product comprises a tail gas stream comprising one or more of (i) unreacted H2, (ii) unreacted CO, and (iii) C4-hydrocarbonaceous and/or C4-oxygenate compounds.
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