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Modelling of a fluidized bed carbonator reactor to capture CO2 from a combustion flue gas

AuthorsAlonso Carreño, Mónica ; Rodríguez Gómez, Nuria ; Grasa Adiego, Gemma ; Abanades García, Juan Carlos
KeywordsChemical reactors
Mathematical modelling
CO2 capture
Issue DateMar-2009
CitationChemical Engineering Science 64(5): 883-891 (2009)
AbstractIn recent years several processes incorporating a carbonation–calcination loop in an interconnected fluidized bed reactor have been proposed as a way to capture CO2 from flue gases. This paper is a first approximation to the modelling of a fluidized bed carbonator reactor. In this reactor the flue gas comes into contact with an active bed composed of particles with very different activities, depending on their residence time in the bed and in the carbonation–calcination loop. The model combines the residence time distribution functions with existing knowledge about sorbent deactivation rates and sorbent reactivity. The fluid dynamics of the solids (CSTR) and gases (PF) in the carbonator are based on simple assumptions. The carbonation rates are modelled defining a characteristic time for the transition between a fast reaction regime to a regime with a zero reaction rate. On the basis of these assumptions the model is able to predict the CO2 capture efficiency for the flue gas depending on the operating and design conditions. Operating windows with high capture efficiencies are discussed, as well as those conditions where only modest capture efficiencies are possible.
Description9 pages, 7 figures.-- Available online Nov 5, 2008.
Publisher version (URL)http://dx.doi.org/10.1016/j.ces.2008.10.044
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