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Comparison of nickel- and iron-based oxygen carriers in chemical looping combustion for CO2 capture in power generation
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
2005 (English)In: Fuel, ISSN 0016-2361, Vol. 84, no 7-8, 993-1006 p.Article in journal (Refereed) Published
Abstract [en]

In chemical looping combustion (CLC), a solid oxygen carrier circulates between two fluidised bed reactors and transports oxygen from the combustion air to the fuel: thus, the fuel is not mixed with air and an inherent CO2 separation occurs. In this paper, CLC is integrated in a natural gas fired combined cycle (NGCC). In this system, nickel- and iron-based oxygen carriers are compared regarding the system's electrical and exergy efficiencies. Furthermore, the feasibility of CLC in two interconnected pressurised fluidised bed reactors (IPFBR) is studied for both oxygen carriers. The hypothetical layout plus dimensions of the IPFBR is presented for a capacity of 800 MW input of natural gas. Finally, top-firing is proposed as an option to overcome the apparent limitation in operating temperature of the reactor equipment and/or the oxygen carriers. The results indicate that there is no significant difference in the system's efficiency if both oxygen carriers could operate at the same temperature. However, CLC seems easier to be technically realised in an IPFBR with a nickel-based oxygen carrier.

Place, publisher, year, edition, pages
2005. Vol. 84, no 7-8, 993-1006 p.
Keyword [en]
chemical looping combustion, carbon dioxide capture, nickel oxide, iron oxide, oxygen carrier, natural gas fired combined cyclce, exergy analysis carrier, separation, particle, system
URN: urn:nbn:se:kth:diva-14605DOI: 10.1016/j.fuel.2004.12.016ISI: 000227650800024ScopusID: 2-s2.0-13944277352OAI: diva2:332646
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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