[미국특허]
Integrated power generation and chemical production using fuel cells at a reduced electrical efficiency
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
C01B-003/16
C25B-003/02
C01B-003/34
H01M-008/14
출원번호
US-0207698
(2014-03-13)
등록번호
US-9419295
(2016-08-16)
발명자
/ 주소
Berlowitz, Paul J.
Barckholtz, Timothy Andrew
Hershkowitz, Frank
출원인 / 주소
ExxonMobil Research and Engineering Company
대리인 / 주소
Weisberg, David M.
인용정보
피인용 횟수 :
0인용 특허 :
47
초록▼
In various aspects, systems and methods are provided for operating a molten carbonate fuel cell at conditions that can improve or optimize the combined electrical efficiency and chemical efficiency of the fuel cell. Instead of selecting conventional conditions for maximizing the electrical efficienc
In various aspects, systems and methods are provided for operating a molten carbonate fuel cell at conditions that can improve or optimize the combined electrical efficiency and chemical efficiency of the fuel cell. Instead of selecting conventional conditions for maximizing the electrical efficiency of a fuel cell, the operating conditions can allow for output of excess synthesis gas and/or hydrogen in the anode exhaust of the fuel cell. The synthesis gas and/or hydrogen can then be used in a variety of applications, including chemical synthesis processes and collection of hydrogen for use as a fuel.
대표청구항▼
1. A method for producing electricity, and H2 or syngas, using a molten carbonate fuel cell having an anode and cathode, the method comprising: introducing an anode fuel stream comprising a reformable fuel into the anode of the molten carbonate fuel cell, an internal reforming element associated wit
1. A method for producing electricity, and H2 or syngas, using a molten carbonate fuel cell having an anode and cathode, the method comprising: introducing an anode fuel stream comprising a reformable fuel into the anode of the molten carbonate fuel cell, an internal reforming element associated with the anode of the molten carbonate fuel cell, or a combination thereof;introducing a cathode inlet stream comprising CO2 and O2 into the cathode of the molten carbonate fuel cell;generating electricity within the molten carbonate fuel cell;generating an anode exhaust from an anode outlet of the molten carbonate fuel cell;separating from the anode exhaust a H2-containing stream, a syngas-containing stream, or a combination thereof,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 of at least about 55%. 2. The method of claim 1, wherein the syngas-containing stream has a molar ratio of H2 to CO from about 3.0:1 to about 1.0:1. 3. The method of claim 2, wherein the molar ratio of H2 to CO is from about 2.5:1 to about 1.5:1. 4. The method of claim 1, wherein the electrical efficiency for the molten carbonate fuel cell is about 35% or less. 5. The method of claim 1, wherein the total fuel cell efficiency for the molten carbonate fuel cell is at least about 65%. 6. The method of claim 1, the method further comprising reforming the reformable fuel, wherein at least about 90% of the reformable fuel introduced into the anode of the molten carbonate fuel cell, the reforming stage associated with the anode of the molten carbonate fuel cell, or a combination thereof is reformed in a single pass through the anode of the molten carbonate fuel cell. 7. The method of claim 1, wherein a reformable hydrogen content of the reformable fuel introduced into the anode of the molten carbonate fuel cell, the internal reforming element associated with the anode of the molten carbonate fuel cell, or the combination thereof, is at least about 75% greater than the amount of H2 oxidized in the anode of the molten carbonate fuel cell to generate electricity. 8. The method of claim 1, wherein the anode fuel stream comprises at least about 10 vol % inert compounds, at least about 10 vol % CO2, or a combination thereof. 9. The method of claim 1, wherein less than 10 vol % of H2 produced in the anode of the molten carbonate fuel cell in a single pass is directly or indirectly recycled to the anode of the molten carbonate fuel cell or the cathode of the molten carbonate fuel cell. 10. The method of claim 1, wherein less than 10 vol % of the syngas-containing stream is directly or indirectly recycled to the anode of the molten carbonate fuel cell or the cathode of the molten carbonate fuel cell. 11. The method of claim 1, wherein less than 10 vol % of the anode exhaust is directly or indirectly recycled to the anode of the molten carbonate fuel cell or the cathode of the molten carbonate fuel cell. 12. The method of claim 1, wherein no portion of the anode exhaust is directly or indirectly recycled to the anode of the molten carbonate fuel cell, directly or indirectly recycled to the cathode of the molten carbonate fuel cell, or a combination thereof. 13. The method of claim 1, further comprising separating at least one of CO2 and H2O from one or a combination of i) the anode exhaust, ii) the hydrogen-containing stream, and iii) the syngas-containing stream. 14. The method of claim 1, wherein the cathode inlet stream comprises about 20 vol % CO2 or less. 15. The method of claim 1, wherein the molten carbonate fuel cell is operated at a voltage VA of about 0.67 Volts or less. 16. The method of claim 1, wherein the anode exhaust has a molar ratio of H2 to CO of about 1.5:1 to about 10:1. 17. The method of claim 16, wherein the anode exhaust has a molar ratio of H2 to CO of at least about 3.0:1.
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