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Hydrodynamic Properties of Interconnected Fluidized Bed Chemical-Looping Combustors  

Son, Sung Real (Department of Chemical and Biomolecular Engineering, Energy and Environment Research Center Korea Advanced Institute of Science and Technology)
Go, Kang Seok (Department of Chemical and Biomolecular Engineering, Energy and Environment Research Center Korea Advanced Institute of Science and Technology)
Kim, Sang Done (Department of Chemical and Biomolecular Engineering, Energy and Environment Research Center Korea Advanced Institute of Science and Technology)
Publication Information
Korean Chemical Engineering Research / v.48, no.2, 2010 , pp. 185-192 More about this Journal
Abstract
The chemical-looping combustion(CLC) has advantages of no energy loss for separation of $CO_2$ without $NO_x$ formation. This CLC system consists of oxidation and reduction reactors where metal oxides particles are circulating through these two reactors. In the present study, the reaction kinetic equations of iron oxide oxygen carriers supported on bentonite have been determined by the shrinking core model. Based on the reactivity data, design values of solid circulation rate and solids inventory were determined for the rector. Two types of interconnected fluidized bed systems were designed for CLC application, one system consists of a riser and a bubbling fluidized bed, and the other one has a riser and two bubbling fluidized beds. Solid circulation rates were varied to about $30kg/m^2s$ by aeration into a loop-seal. Solid circulation rate increases with increasing aeration velocity and it increases further with an auxiliary gas flow into the loop-seal. As solid circulation rate is increased, solid hold up in the riser increases. A typical gas leakage from the riser to the fluidized bed is found to be less than 1%.
Keywords
Chemical-Looping Combustion; Fluidized Bed; Hydrodynamics; Oxygen Carrier Particle; Carbon Dioxide Separation;
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