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The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
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Full-Text Articles in Engineering
Modeling On Heterogeneous Structure In Acceleration Regime Of Gas-Solid Riser Flows, Chao Zhu, Jun You, Dawei Wang, Liang-Shih Fan
Modeling On Heterogeneous Structure In Acceleration Regime Of Gas-Solid Riser Flows, Chao Zhu, Jun You, Dawei Wang, Liang-Shih Fan
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
Recent measurement of solid concentration in gas-solid riser flows by Electric Capacitance Tomography (ECT) reveals a strong heterogeneous structure, typically represented by a core-annulus-wall zone pattern. In this paper we present a mechanistic model in which the formation of the heterogeneous structure is due to the radial migration of solid flow from the wall toward center as well as due to the non-uniform acceleration of solids across the cross-section near the bottom of the riser. Firstly we present the general governing equations and discuss problem closure; then a simplified model with one-way flow coupling between the wall region and the …
Modeling Fuel Mixing In A Fluidized Bed Combustor, David Pallarès, Filip Johnsson
Modeling Fuel Mixing In A Fluidized Bed Combustor, David Pallarès, Filip Johnsson
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
This paper presents a 3-dimensional model for fuel mixing in fluidized bed combustors. The model accounts for the mixing patterns experimentally shown to govern the mixing in the different zones of the riser and the return leg and can be applied both under bubbling and circulating regimes. Thus, the semi-empirical basis of the model was previously validated in different large-scale fluidized bed combustors and is combined with a model for fuel particle conversion to obtain the fuel concentration. Results obtained with the model are compared with experimental data from the Chalmers 12 MWth CFB combustor, yielding reasonably agreement.
Modeling Of An Interconnected Fluidized Bed Reactor For Chemical Looping Combustion, Min Xu, Naoko Ellis, Ho-Jung Ryu , C. Jim Lim
Modeling Of An Interconnected Fluidized Bed Reactor For Chemical Looping Combustion, Min Xu, Naoko Ellis, Ho-Jung Ryu , C. Jim Lim
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
Chemical Looping Combustion (CLC) is comprised of two reactors, in which direct contact between air and fuel is avoided. A metal oxide, as oxygen carrier, transports oxygen from the air reactor to the fuel reactor while circulating between them. Based on the hydrodynamics coupled with reaction kinetics of oxygen carrier from the literature, a model for an interconnected fluidized bed reactor has been developed to optimize the design and operation of the reactor system. The model considers the chemical reaction of a single particle and a particle population balance for the calculation of bed particle conversion. The core-annulus and two-phase …
Simulation Of A Silicon Cvd Spouted Fluidized Bed Reactor: Semi-Batch Operations, Juliana Piña, Verónica Bucalá, Susana N. Schbib, Paul Ege, Hugo Ignacio De Lasa
Simulation Of A Silicon Cvd Spouted Fluidized Bed Reactor: Semi-Batch Operations, Juliana Piña, Verónica Bucalá, Susana N. Schbib, Paul Ege, Hugo Ignacio De Lasa
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
A comprehensive multiphase gas-solid mathematical model that successfully describes the batch growth of silicon particles in a chemical vapor deposition (CVD) submerged spouted bed reactor is extended to simulate semi-batch operations with periodic seeds additions and product extractions. This model takes into account the fluidized bed reactor as well as a population balance equation representing particle growth and agglomeration. Experimental data obtained from semi-batch operation in a pilot scale reactor at REC Silicon Inc. are used to evaluate the proposed mathematical model.