Verbesserung der Analyse von Festbettreaktoren durch die Berücksichtigung von Porositäts‐ und Strömungsverteilung

Vortmeyer, D.; Winter, Rudolf P.

doi:10.1002/cite.330550417

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…Industrially used aspect ratios depend on the reaction system and the technical realization. The aspect ratio can be as low as 1.5{9.4 for isomerization reactors, 3{4 for the synthesis of phthalic anhydride and 5.6{8.5 for vinyl acetate synthesis, just to mention a few technical systems described in the literature (see, for example, Carberry 1981; Thoenes 1980;Vortmeyer & Winter 1983;Winter 1983, and the references therein). A recent patent of ABB Lummus Global Inc. (1999) describes the application of structured packings in tubes with a rectangular cross-section and even smaller aspect ratios.…”

Section: Technical Relevance Of¯xed-bed Reactors Withmentioning

confidence: 99%

Analysis of the flow field and pressure drop in fixed-bed reactors with the help of lattice Boltzmann simulations

Zeiser

Steven²,

Freund³

et al. 2002

Philosophical Transactions of the Royal Society of London. Seri

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The pressure drop of technical devices is a crucial property for their design and operation. In this paper, we show how the results of lattice Boltzmann simulations can be used in science and engineering to improve the physical understanding of the pressure drop and the flow inhomogeneities in porous media, especially in sphere-packed fixed-bed reactors with low aspect ratios. Commonly used pressure drop correlations are based on simplified assumptions such as the capillary or tortuosity model, which do not reflect all hydrodynamic effects. Consequently, empirical correlations for certain classes of media have been introduced in the past to bridge the gap between the models and the experimental findings. As is shown in this paper by the detailed analysis of the velocity field in the void space of packed beds, the pressure drop is due to more complex hydrodynamics than considered in the above-mentioned models. With the help of lattice Boltzmann simulations, we were able to analyse the different contributions to the total dissipation, namely shear and deformation of the fluid, for different geometries over a wide range of Reynolds numbers. We further show that the actual length of the flow paths changes considerably with the radial and circumferential position.

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Section: Technical Relevance Of¯xed-bed Reactors Withmentioning

confidence: 99%

Analysis of the flow field and pressure drop in fixed-bed reactors with the help of lattice Boltzmann simulations

Zeiser

Steven²,

Freund³

et al. 2002

Philosophical Transactions of the Royal Society of London. Seri

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“…8. The radially varying empty space distribution and velocity distribution has been taken into account in detailed reactor calculations, as well as in the determination of accurate heat transport parameters [16][17][18]. This will be addressed in the next section.…”

Section: Gas Flow and Pressure Drop In Fixed Bedsmentioning

confidence: 99%

“…This lumps the complex interplay between convective flow at the tube wall and conduction transport by (point) contact between the fixed bed and the heat-exchange surface. Heat transport in packed tubes has been investigated and discussed in detail [8,[16][17][18]. In Ref.…”

Section: Heat Transfer In Catalyst-filled Tubesmentioning

confidence: 99%

Catalytic Fixed‐Bed Reactors

Eigenberger

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Catalyst Shapes for Fixed‐Bed Reactors Random Packings Monoliths Gas Flow and Pressure Drop in Fixed Beds Heat Transfer in Catalyst‐Filled Tubes Comparison of Different Catalyst Shapes Types of Fixed‐Bed Reactor Adiabatic Reactors Multi‐Stage Reactors Cooled or Heated Multitubular Fixed‐Bed Reactors Heat‐Transfer Media Design Concepts for Exothermic Reactions Design Concepts for Endothermic Reactions Reaction Control by Controlling the Heat‐Transfer Medium Temperature Reaction Control through Catalyst Activity Profile Multifunctional Fixed‐Bed Reactors Heat‐Integrated Reactors Heat‐Integrated Reactors for Exothermic Reactions Heat‐Integrated Reactors for Endothermic Reactions Sorptive and Membrane Reactor Concepts Safety Issues of Fixed‐Bed Reactors Parametric Sensitivity and Run‐Away Wrong‐Way Behavior and Transient Run‐Away Decoking of Fixed‐Bed Reactors Other Safety Aspects Conclusions

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“…The conditions for a spherical packing are illustrated schematically in Figure 8. The radially varying empty space distribution and velocity distribution must be taken into account in detailed reactor calculations, as well as in the determination of accurate heat-transport parameters [12], [13].…”

Section: Heat Transport Transverse To the Flow Directionmentioning

confidence: 99%

Fixed-Bed Reactors

Eigenberger

2000

Ullmann's Encyclopedia of Industrial Chemistry

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Verbesserung der Analyse von Festbettreaktoren durch die Berücksichtigung von Porositäts‐ und Strömungsverteilung

Cited by 9 publications

References 3 publications

Analysis of the flow field and pressure drop in fixed-bed reactors with the help of lattice Boltzmann simulations

Analysis of the flow field and pressure drop in fixed-bed reactors with the help of lattice Boltzmann simulations

Catalytic Fixed‐Bed Reactors

Fixed-Bed Reactors

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