Assessment of integration of methane-reduced ceria chemical looping CO2/H2O splitting cycle to an oxy-fired power plant |
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| Affiliation: | 1. Department of Energy, Politecnico di Torino, Italy;2. German Aerospace Center (DLR), Institute of Engineering Thermodynamics, 70569, Stuttgart, Germany;3. Institute of Energy Technologies, Department of Chemical Engineering and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Barcelona, Spain;4. Marine and Renewable Energy Research (MaREI) Centre, Environmental Research Institute, School of Engineering and Food Science, University College Cork, Lee Road, Cork, T23 XE10, Ireland;5. Polytechnic Department of Engineering and Architecture (DPIA), Universita di Udine, Italy;6. Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL, United States;1. Processes, Materials and Solar Energy Laboratory, PROMES-CNRS, 7 Rue du Four Solaire, 66120 Font-Romeu, France;2. Department of Mechanical Engineering, King Mongkut’s Institute of Technology Ladkrabang, Prince of Chumphon Campus, Chumphon 86160, Thailand;3. Univ. Grenoble Alpes, INES, BP 332, 50 Avenue du Lac Léman, F-73375 Le-Bourget-du-lac, France;4. CEA-LITEN Laboratoire des Systèmes Solaires et Thermodynamiques (LSST), F-38054 Grenoble, France |
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| Abstract: | In this paper, we investigated the effect of reaction kinetics and moving bed reactors for chemical looping (CO2/H2O) splitting unit (CL) that produces syngas and fed back to the power plant to gain the efficiency loss due to carbon capture. The reduction reactor (RED) produces methane is partially oxidized to make syngas and reducing the non-stoichiometric ceria which is transported to oxidation reactor (OXI) where the flue gases (CO2 and H2O) split to produce syngas. We developed the kinetics for methane reduced ceria and CO2/H2O splitting in a tubular reactor for an operating temperature range of (900–1100 °C) for different methane concentration which yielded to Avrami-Erofeev (AE3) model fits well for both redox reaction with different reaction constants. A moving bed reactors system is developed representing RED and OXI reactors of CL unit with kinetics hooked to the model in Aspen Plus with FORTRAN code. The effect of thermodynamics and the kinetics of redox reaction was investigated in the proposed integrated plant. The CL unit efficiency obtained is 42.8% for kinetic-based CL unit compares to 64% for thermodynamic based CL unit. However, the maximum available efficiency of the proposed layout lowered as 50.9% for kinetic-based CL unit plant compare to than 61.5% for thermodynamic based CL unit. However, the proposed plant shows an improvement in the energy efficiency penalty from 11.3% to 3.8% after CCS. |
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| Keywords: | Chemical looping Kinetics Experimental System analysis Moving bed reactors |
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