Two-phase model for a catalytic turbulent fluidized-bed reactor: Application to ethylene synthesis

Chaouki, Jamal; Gonzalez, Ali; Guy, Christophe; Klvana, D.

doi:10.1016/s0009-2509(98)00438-2

Cited by 37 publications

(35 citation statements)

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“…Some studies indicated that glycerol decomposition to CH 4 and CO 2 is highly favourable during the steam reforming process. 21 The increases in the product concentrations of H 2 , CO 2 , CH 4 and CO were mainly due to the increase in glycerol conversion. H 2 selectivity increased with time and no significant changes were found in CO 2 and CH 4 selectivity.…”

Section: Glycerol Conversion and Hydrogen Productionmentioning

confidence: 99%

“…i, Selectivity(%) = 100  (C atoms in species i )/(C atoms produced in gas phase) (33) where n represents the average molar flow rate, kmol/s; and species i = CO 2 , CH 4 and CO.…”

Section: Glycerol Conversion and Hydrogen Productionmentioning

confidence: 99%

“…Concentrations of the products H 2 , CO 2 , CH 4 , and CO at the outlet with time are plotted in Figure 7.…”

Section: Glycerol Conversion and Hydrogen Productionmentioning

confidence: 99%

“…On the basis of these data, the calculated selectivity of gas products and the mole ratio of H 2 /CO 2 are shown in Figure 8. Apart from the H 2 product, CO 2 and CH 4 remained in significant quantities and selectivity, which indicated reaction R1 converted glycerol easily to CO 2 and CH 4 . Some studies indicated that glycerol decomposition to CH 4 and CO 2 is highly favourable during the steam reforming process.…”

Section: Glycerol Conversion and Hydrogen Productionmentioning

confidence: 99%

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Computational Fluid Dynamics Simulation of Gas−Solid Flow during Steam Reforming of Glycerol in a Fluidized Bed Reactor

2008

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Abstract:A CFD simulation of gas-solid flow in a fluidised bed reactor was performed to investigate the steam reforming of glycerol using a three-step reaction scheme, motivated by the worldwide increase of crude glycerol produced by the transesterification of vegetable oil into biodiesel. The Eulerian-Eulerian two-fluid approach was adopted to simulate hydrodynamics of fluidisation, and chemical reactions were modelled by the laminar finite-rate model. The gas-solid system exhibited a more heterogeneous structure. Clusters were observed to fall and stack together along the wall, and the process of wall slug formation was very evident. This suggests the bed should be agitated to maintain satisfactory fluidising conditions. The results showed that the glycerol conversion increased with increasing reaction time and most of the gas products H 2 , CO 2 , CH 4 and CO were formed during the initial 2 s. The prediction of the gas-solid phase flows and mixing, glycerol conversion and products distribution will provide helpful data to design and operate a bench scale catalytic fluidised bed reactor.

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Section: Glycerol Conversion and Hydrogen Productionmentioning

confidence: 99%

“…i, Selectivity(%) = 100  (C atoms in species i )/(C atoms produced in gas phase) (33) where n represents the average molar flow rate, kmol/s; and species i = CO 2 , CH 4 and CO.…”

Section: Glycerol Conversion and Hydrogen Productionmentioning

confidence: 99%

“…Concentrations of the products H 2 , CO 2 , CH 4 , and CO at the outlet with time are plotted in Figure 7.…”

Section: Glycerol Conversion and Hydrogen Productionmentioning

confidence: 99%

Section: Glycerol Conversion and Hydrogen Productionmentioning

confidence: 99%

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Computational Fluid Dynamics Simulation of Gas−Solid Flow during Steam Reforming of Glycerol in a Fluidized Bed Reactor

2008

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“…Generally, these reactor models and the two-phase theory best describe the hydrodynamic behaviour of bubbling fluidized beds [23][24][25][26]. The theory entails that most of the gas reagents are contained in a lean, solids/catalyst-deprived phase that bubbles though a dense, solids-rich (emulsion) phase.…”

Section: Introductionmentioning

confidence: 99%

Interphase mass transfer of the high velocity bubbling fluidization regime

Saayman

Nicol

2015

Chemical Engineering Research and Design

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Gas-solid fluidization experiments were performed in two separate experimental setups with similar dimensions. Fast X-Ray Tomography (XRT) was used in setup 1, while ozone decomposition experiments were performed in setup 2. Packing and operation characteristics for the two setups were close to identical. The hydrodynamic measurements from the XRT acquisitions were used to evaluate the interphase mass transfer characteristics obtained from the ozone decomposition results. Superficial velocities (U 0 ) spanning the bubbling up to the onset of the turbulent regime (U c ) were employed. Traditional specific interphase mass transfer (k be ) correlations are based on incipiently fluidized beds; however, results suggested that a distinction should be made between the low-interaction bubbling regime and the highinteraction bubbling regime. A change in mass transfer behaviour occurred around a U 0 /U c value of 0.25. An empirical correlation for k be of the high-interaction bubbling regime is 1

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Turbulent Fluidization

2020

Essentials of Fluidization Technology

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Two-phase model for a catalytic turbulent fluidized-bed reactor: Application to ethylene synthesis

Cited by 37 publications

References 0 publications

Computational Fluid Dynamics Simulation of Gas−Solid Flow during Steam Reforming of Glycerol in a Fluidized Bed Reactor

Computational Fluid Dynamics Simulation of Gas−Solid Flow during Steam Reforming of Glycerol in a Fluidized Bed Reactor

Interphase mass transfer of the high velocity bubbling fluidization regime

Turbulent Fluidization

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