An improved bubble assemblage model for fluidized-bed catalytic reactors
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Mathematical correlations in two-phase modeling of fluidized bed adsorbers
2022, Journal of Hazardous MaterialsCitation Excerpt :Some researchers adopted an intermediate approach to describe the mixing of the gas in the emulsion phase. For instance, Shiau and Lin (Shiau and Lin, 1993) introduced a model in which the emulsion phase in a fluidized-bed catalytic reactor is divided axially into a series of well–mixed compartments, each of which exchanges the emulsion gas with bubble and cloud phases. In other cases, the model outcomes were reported to be relatively insensitive to the gas–mixing pattern in emulsion phase (Grace, 1986).
Modeling of autothermal reforming of methane in a fluidized bed reactor with perovskite membranes
2018, Chemical Engineering and Processing: Process IntensificationModel-assisted analysis of fluidized bed chemical-looping reactors
2015, Chemical Engineering ScienceCitation Excerpt :Summarizing their results and conclusions, it was observed that fuel conversion can be hindered by large and fast bubbles passing through the reactor and agreement with experimental data depends on the accuracy of the bubble phase modeling. On the contrary, hydrodynamic modeling approaches (Davidson and Harrison, 1963; Kunii and Levenspiel, 1968a, 1968b; Shiau and Lin, 1993; Tabis and Essekkat, 1992) are more suitable for reactor design and process sensitivity analyses. In the context of simulation of chemical-looping reactors, hydrodynamic models have been often used to provide insights to process efficiency and selectivity.
Experimental study of steam methane reforming in a Pd-based fluidized bed membrane reactor
2013, Chemical Engineering JournalOxidative coupling of methane in a fluidized bed reactor: Influence of feeding policy, hydrodynamics, and reactor geometry
2011, Chemical Engineering JournalCitation Excerpt :However, these models do not give an insight into the extent of solids and gas back-mixing, radial concentration gradients, or detailed bed hydrodynamics, and thus, they cannot predict the reaction behavior in unusual reactor geometries. Some improved three-phase models such as the improved bubble assemblage model [45] and the counter-current back mixing model [46] were mainly introduced to account for gas back-mixing, but also to improve the general hydrodynamic model of a fluidized bed. Bukur showed in [47,48] that three-phase models based on a counter-current back mixing model suffer from numerical instabilities due to a two value boundary problem, which becomes increasingly difficult to be solved with more species being considered within the system.
Steam reforming of methane in a tapered membrane - Assisted fluidized - Bed reactor: Modeling and simulation
2011, International Journal of Hydrogen Energy