NDLI: CO2 Separation From Combined Cycles Using Molten Carbonate Fuel Cells

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Manzolini, G. Campanari, S. Chiesa, P. Giannotti, A. Bedont, P. Parodi, F.
Copyright Year	2011
Abstract	This paper presents an analysis of advanced cycles with limited CO2 emissions based on the integration of Molten Carbonate Fuel Cells (MCFC) in natural gas fired combined cycles (NGCC) in order to efficiently capture CO2 from the exhaust of the gas turbine. In the proposed cycles, the gas turbine flue gases are used as cathode feeding for a MCFC, where CO2 is transferred from the cathode to anode side, concentrating the CO2 in the anode exhaust. At the anode side the MCFCs are fed with natural gas, processed by an external reformer which is thermally integrated within the FC module; the corresponding CO2 production is completely concentrated at the anode. The resulting anode exhaust stream is then sent to a CO2 removal section which is based on a cryogenic CO2 removal process, based on internal or external refrigeration cycles, cooling the exhaust stream in the heat recovery steam generator, and recycling residual fuel compounds to the power cycle. In all cases, a high purity CO2 stream is obtained after condensation of water and pumped in liquid form for subsequent storage. It is investigated the possibility to arrange the MCFC section with different configurations and operating parameters of the fuel cell modules, and the option to include two fuel cell modules in series connection, with intermediate cooling of the cathode stream, in order to enhance the plant CO2 separation effectiveness. The MCFC section behavior is simulated taking into account Ansaldo Fuel Cells experience and reference data, based on a dedicated simulation tool. Detailed energy and material balances of the most promising cycle configurations are presented; fuel cell and conventional components working parameters are described and discussed, carrying out a sensitivity analysis on the fuel cell CO2 utilization factor. The plant shows the potential to achieve a CO2 avoided fraction approaching 70–80%, depending on the CO2 concentration limit at cathode outlet, with an overall electric efficiency only 1–2% point lower than reference combined cycle. The plant power output increases by over 40%, thanks to the contribute of the MCFC section which acts as an active CO2 concentrator, giving a potentially relevant advantage with respect to competitive carbon capture technologies.
Sponsorship	Advanced Energy Systems Division
Starting Page	999
Ending Page	1008
Page Count	10
File Format	PDF
ISBN	9780791854693
DOI	10.1115/FuelCell2011-54719
Volume Number	ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology
Conference Proceedings	ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability
Language	English
Publisher Date	2011-08-07
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Co2 capture Mcfc as co2 separator Mcfc detailed model Molten carbonate fuel cells Combined cycles Carbon capture and storage Separation (technology) Carbon dioxide
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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