Comparison of nickel- and iron-based oxygen carriers in chemical looping combustion for CO2 capture in power generation |
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| Affiliation: | 1. Dept. of Chemical Engineering and Technology/Energy Processes, Royal Institute of Technology, Teknikringen 50, SE-10044 Stockholm, Sweden;2. Vattenfall Utveckling AB, SE-162 87 Stockholm, Sweden;3. Department of Mechanical Engineering/Energy Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden;1. Department of Civil and Environmental Engineering, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom;2. Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, United Kingdom;3. Department of Chemical Engineering, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom;1. School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore;2. Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, Singapore 637141, Singapore;1. Sustainable Materials Management, Flemish Institute for Technological Research (VITO), Boeretang 200, 2400, Mol, Belgium;2. Department of Chemistry, Center for Ordered Materials, Organometallics and Catalysis (COMOC), Faculty of Sciences, Ghent University, Krijgslaan 281 (S3), 9000, Ghent, Belgium;3. Department of Chemistry, Sol-gel Centre for Research on Inorganic Powders and Thin Films Synthesis (SCRiPTS), Faculty of Sciences, Ghent University, Krijgslaan 281 (S3), 9000, Ghent, Belgium;4. Department of Materials, Textiles and Chemical Engineering, Industrial Catalysis and Adsorption Technology (INCAT), Ghent University, Valentin Vaerwyckweg 1, 9000, Ghent, Belgium;1. Department of Energy, Politecnico di Milano, Via Lambruschini 4, 20156, Milano, Italy;2. Department of Energy and Environment, Instituto de Carboquímica (ICB-CSIC), Miguel Luesma Castán 4, 50018, Zaragoza, Spain;3. Instituto Nacional del Carbón (INCAR-CSIC), Francisco Pintado Fe 26, 33011, Oviedo, Spain |
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| Abstract: | 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. |
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