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
H01M-008/04089(2016.01)
H01M-008/04746(2016.01)
H01M-008/0612
H01M-008/0637
C21B-015/00
C04B-007/36
H01M-008/0668
H01M-008/0662
H01M-008/04791(2016.01)
H01M-008/04119(2016.01)
C01B-003/50
C07C-029/151
C10G-002/00
C07C-001/04
C10K-003/04
H01M-008/04111(2016.01)
C01B-003/16
C25B-003/02
C01B-003/34
C01B-003/48
C07C-029/152
F02C-006/18
H01M-008/14
출원번호
US-0207711
(2014-03-13)
등록번호
US-9735440
(2017-08-15)
발명자
/ 주소
Berlowitz, Paul J.
Barckholtz, Timothy Andrew
Hershkowitz, Frank
Taylor, Kevin
출원인 / 주소
EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
대리인 / 주소
Ward, Andrew T.
인용정보
피인용 횟수 :
0인용 특허 :
50
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 of the molten carbonate fuel cell;generating electricity within the molten carbonate fuel cell;generating an anode exhaust: comprising H2, CO, and CO2, having a ratio of H2 to CO of at least about 2.5:1, and having a CO2 content of at least about 20 vol %, 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;removing water and CO2 from at least a portion of the anode exhaust to produce an anode effluent gas stream, the anode effluent gas stream having a concentration of water that is less than half of a concentration of water in the anode exhaust, having a concentration of CO2 that is less than half of a concentration of CO2 in the anode exhaust, or a combination thereof, the anode effluent gas stream also having a ratio of H2 to CO of about 2.3:1 or less; andreacting at least a portion of the anode effluent gas stream over a non-shifting Fischer-Tropsch catalyst to produce at least one gaseous product and at least one non-gaseous product. 2. The method of claim 1, further comprising recycling at least a portion of the gaseous product to an anode inlet, to a cathode inlet, or to a combination thereof. 3. The method of claim 2, wherein the recycling step comprises: removing CO2 from the gaseous product to produce a CO2-concentrated stream and a separated syngas product comprising CO2, CO, and H2; andrecycling at least a portion of the separated syngas product to the anode inlet, the cathode inlet, or a combination thereof. 4. The method of claim 3, wherein the at least a portion of the separated syngas product is oxidized prior to the recycling step. 5. The method of claim 2, wherein the gaseous product comprises a tail gas stream comprising one or more of (i) unreacted H2, (ii) unreacted CO, and (iii) C4-hydrocarbonaceous or C4-oxygenate compounds. 6. The method of claim 1, wherein the non-shifting Fischer-Tropsch catalyst comprises Co, Rh, Ru, Ni, Zr, or a combination thereof. 7. The method of claim 1, further comprising exposing at least a portion of the anode exhaust 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 to form a purified H2 stream. 8. The method of claim 7, wherein the shifted anode exhaust has a molar ratio of H2 to CO that is less than a molar ratio of H2 to CO in the anode exhaust. 9. The method of claim 1, further comprising exposing at least a portion of the anode effluent gas stream to a water gas shift catalyst to form a shifted anode effluent. 10. The method of claim 9, wherein the shifted anode effluent has a molar ratio of H2 to CO that is less than a molar ratio of H2 to CO in the anode effluent gas stream. 11. The method of claim 1, wherein the cathode inlet stream comprises exhaust from a combustion turbine. 12. The method of claim 1, wherein the anode exhaust has a ratio of H2:CO of at least about 3.0:1. 13. 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. 14. 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. 15. The method of claim 1, wherein a fuel utilization in the anode is about 50% or less and a CO2 utilization in the cathode is at least about 60%. 16. 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. 17. The method of claim 16, wherein performing the endothermic reaction consumes at least about 40% of the waste heat. 18. 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 fuel cell is at least about 55%. 19. 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.
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