[특허]Fuel cell integration within a heat recovery steam generator

Fuel cell integration within a heat recovery steam generator 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01M-008/14 H01M-008/04 H01M-008/24 H01M-008/04007(2016.01) H01M-008/249 C01B-003/50 C10K-003/04 C10G-002/00 H01M-008/0668 H01M-008/2475 F01K-005/02
출원번호	US-0325664 (2014-07-08)
등록번호	US-9819042 (2017-11-14)
발명자 / 주소	Berlowitz, Paul J. Barckholtz, Timothy Andrew Hershkowitz, Frank
출원인 / 주소	EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
대리인 / 주소	Negron, Liza
인용정보	피인용 횟수 : 0 인용 특허 : 37

초록 ▼

Systems and methods are provided for incorporating molten carbonate fuel cells into a heat recovery steam generation system (HRSG) for production of electrical power while also reducing or minimizing the amount of CO2 present in the flue gas exiting the HRSG. An optionally multi-layer screen or wall of molten carbonate fuel cells can be inserted into the HRSG so that the screen of molten carbonate fuel cells substantially fills the cross-sectional area. By using the walls of the HRSG and the screen of molten carbonate fuel cells to form a cathode input manifold, the overall amount of duct or flow passages associated with the MCFCs can be reduced.

대표청구항 ▼

1. A method of treating exhaust gas to reduce CO2 using a molten carbonate fuel cell located inside a heat recovery steam generator (“HRSG”), the method comprising: receiving CO2-containing exhaust gas through an inlet of the HRSG to form a received gas flow;passing the received gas flow through a fuel cell screen comprising a plurality of molten carbonate fuel cells to generate a cathode exhaust gas comprising at least about 50 vol % less CO2 than the received gas flow, the fuel cell screen being located within the HRSG, wherein substantially all of the received gas flow is passed into a cathode section of the molten carbonate fuel cells;passing the cathode exhaust gas into a first heat exchanger; andpassing the cathode exhaust gas into an exhaust stack. 2. The method of claim 1, wherein the method further comprises passing the received gas flow into a duct burner prior to passing the received gas flow into the fuel cell screen. 3. The method of claim 2, wherein passing the received gas flow into the duct burner comprises passing the received gas flow into the duct burner with a superficial velocity of at least about 4 m/s. 4. The method of claim 1, wherein the method further comprises passing the received gas flow into the fuel cell screen with a superficial velocity of about 1 m/s or less. 5. The method of claim 1, wherein the method further comprises passing the cathode exhaust gas into the first heat exchanger with a superficial velocity of at least about 4 m/s. 6. The method of claim 1, wherein the CO2-containing exhaust gas received through the inlet of the HRSG has a superficial velocity at the inlet of at least about 4 m/s. 7. The method of claim 1, wherein the fuel cell screen comprises a first layer and a second layer, and the method further comprises dividing the received gas flow into at least a first gas flow portion that is passed to the first layer and a second gas flow portion that is passed to the second layer. 8. The method of claim 1, further comprising passing the received gas flow into a second heat exchanger prior to passing the received gas flow into the fuel cell screen. 9. The method of claim 1, wherein the plurality of molten carbonate fuel cells are operated with a current density of greater than about 1500 mA/m2. 10. The method of claim 1, wherein the CO2-containing exhaust gas comprises an exhaust gas from a gas turbine. 11. The method of claim 1, wherein the cathode exhaust comprises substantially all of the gas in the flow path providing heat to the first heat exchanger. 12. The method of claim 1, wherein the fuel cell screen is sized to reduce a CO2 concentration in the cathode exhaust by at least about 65% relative to the received gas flow.

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