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Study and Improvement of the Regeneration of Metallic Oxides Used as Oxygen Carriers for a New Combustion Process
-
Sebastien Roux
Veröffentlicht/Copyright:
1. Dezember 2006
A new combustion process called chemical-looping combustion, has been suggested as an energetically efficient method for separation and capture of the carbon dioxide, generated by the combustion of fossil's fuels. This process consists of a reversible combustion, based on successive fuel oxidation via the reduction of metallic oxide followed by its regeneration by air oxidation. The generated products are: the reduced oxygen carrier, which is regenerated in a second reactor by air and recycled, and a flue gas, mainly composed of CO2 and H2O, which could be separated by condensation.In chemical-looping combustion process, it is important that the metallic oxide, used as an oxygen carrier, has a high reactivity with the fuel and good regeneration ability. It should have also good mechanical characteristics, in order to avoid its attrition and agglomeration during the successive cyclic reactions.In this work, the reactivity study of various oxygen carriers was carried out, during ten successive oxidation and reduction cycles, using a thermal gravimetrical analysis apparatus. From the results obtained, two types of oxygen carriers were identified: very reactive oxygen carriers, with a decreasing of their reactivity during the successive cycles of reduction and oxidation, and oxygen carriers with low and constant reactivity during the successive cycles.In order to improve the capacity of regeneration of the reactive oxygen carrier, several mixtures were prepared by adding stable and non-reactive metallic oxide, which acts as binder or doping agent by the mechanical properties of the mixed oxygen carrier improvement.The results obtained showed that, for all mixtures prepared and tested, the addition of binders to the reactive metallic oxides improve their regeneration ability. The best results, concerning the reactivity and the regeneration performances, were obtained with Fe2O3 mixed with CaO, TiO2 or MgO, followed by NiO mixed with CaO or TiO2 and finally CuO mixed with TiO2 or MgO.
Published Online: 2006-12-1
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston
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Schlagwörter für diesen Artikel
energy;
combustion;
reactivity;
metal oxides;
regeneration;
greenhouse gases
Artikel in diesem Heft
- Review
- Practical Implications of Bifurcation and Chaos in Chemical and Biological Reaction Engineering
- Article
- Optimization of Bacterial Oxidation Process Parameters for Selective Leaching of Nickel by Thiobacillus Ferrooxidans
- Direct Numerical Simulation of Mass Transfer from Spherical Bubbles: the Effect of Interface Contamination at Low Reynolds Numbers
- Plasma-Prepared Ni/Al2O3: Preparation, Characterization and Toluene Hydrogenation
- Flow Induced by Dual-Turbine of Different Diameters in a Gas-Liquid Agitation System: the Agitation and Turbulence Indices
- A Comprehensive Model for Catalytic Membrane Reactor
- A Structured Model for Interleukin-11 Production with Recombinant E.coli and Genetic Algorithm for Model Parameter Estimation
- Calorimetry for Inferential Conversion Monitoring in Emulsion Copolymerization Reactors
- Identification of the State of a Magneto-Fluidized Bed by Pressure Fluctuations
- Modeling a Silicon CVD Spouted Bed Pilot Plant Reactor
- Intercooled Double-Bed Reactor for LTWGS Reaction with Catalyst Poisoning by Chlorine: Inlet Temperatures for the Maximization of the Production
- Comprehensive Modeling of Gas Fluidized-Bed Reactors Allowing for Transients, Multiple Flow Regimes and Selective Removal of Species
- Isothermal PFR/PMR Networks
- Influence of Particles and Electrolyte on Gas Hold-Up and Mass Transfer in a Slurry Bubble Column
- Three Phase Catalytic Reactions: Role of Omega Aqueous Phase in Solid-Liquid Phase Transfer Catalyzed Etherification of 2'- Hydroxy Acetophenone
- Treatment of Cork Wastes in a Conical Spouted Bed Reactor
- Biosorption of Combined Industrial Effluents using Phanerochaete Chrysosporium
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- Short Communication or Note
- Dehydrogenation of Ethane and Hydrogenation of Carbon Dioxide in a Catalytic Membrane Reactor Using Copper-Plated LaNi5 as a Membrane Material
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- Stabilization of a CSTR in an Oscillatory State by Varying the Thermal Characteristics of the Reactor Vessel
