Heat transfer in two- and three-phase bubble column reactors with internals

Schlüter, Stefan; Steiff, Artur; Weinspach, Paul‐Michael

doi:10.1016/0255-2701(94)04002-8

Cited by 32 publications

(20 citation statements)

References 16 publications

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“…An overview of industrial processes performed in bubble columns is given by Schlüter et al. . Despite the widespread applications of bubble columns, the interactions between hydrodynamics, mass transfer mechanisms, chemical reactions, yield and product quality are inadequately known so far.…”

Section: Introductionmentioning

confidence: 99%

Models for the Numerical Simulation of Bubble Columns: A Review

Mühlbauer

Hlawitschka

Bart

2019

Chemie Ingenieur Technik

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This work reviews the state‐of‐the‐art models for the simulation of bubble columns and focuses on methods coupled with computational fluid dynamics (CFD) where the potential and deficits of the models are evaluated. Particular attention is paid to different approaches in multiphase fluid dynamics including the population balance to determine bubble size distributions and the modeling of turbulence where the authors refer to numerous published examples. Additional models for reactive systems are presented as well as a special chapter regarding the extension of the models for the simulation of bubble columns with a present solid particle phase, i.e., slurry bubble columns.

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Section: Introductionmentioning

confidence: 99%

Models for the Numerical Simulation of Bubble Columns: A Review

Mühlbauer

Hlawitschka

Bart

2019

Chemie Ingenieur Technik

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“…In order to ensure stable and safe reactor operation, high product selectivity, and long catalyst lifetime, isothermal processing is preferred. 2,3 A successful heat management is achieved using dense internal heat exchanger tube bundles, which offer large specific heat transfer areas. 4−6 Such heat exchanger tube bundles can occupy up to 60% of the reactor's cross-section and alter the hydrodynamics significantly.…”

Section: Introductionmentioning

confidence: 99%

Two-Bubble Class Approach Based on Measured Bubble Size Distribution for Bubble Columns with and without Internals

Möller

Kipping

Lavetty

et al. 2019

Ind. Eng. Chem. Res.

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The complex flow patterns in bubble columns can be phenomenologically described by the two-bubble class approach. For the first time, this approach is applied to bubble columns with dense internals. Internals of square and triangular pitch tube patterns of two tube sizes (8 × 10–3 and 13 × 10–3 m) with flat and U-tube bottom design and cross-sectional occupation of ∼25% were inserted in a bubble column of 0.1 m diameter and 2 m height. Contrary to the well-known gas disengagement technique, dual-plane ultrafast X-ray computed tomography data have been used for the bubble class allocation. Experiments were performed at superficial gas velocities ranging from 0.02 to 0.20 m s–1 to cover homogeneous and heterogeneous flow conditions. The contributions of small and large bubble classes on total gas holdup, flow structure and bubble rise velocities were determined. Furthermore, the regime transition onset was determined based on the two-bubble class approach. Eventually, new correlations for regime transition, small and large bubble rise velocities, and large bubble holdup as well as total gas holdup are proposed based on sub-channel area, sub-channel hydraulic diameter, and occlusion area.

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“…BCRs are often used for hydrogenations, oxidations, and bioprocesses as well as for wastewater treatment, etc. Since most of the reactions in BCRs are of exothermic nature, an appropriate heat management is required to ensure isothermal reaction conditions with high product selectivity and stable reactor operation , . Tube bundle internals are mostly applied to efficiently remove the reaction heat.…”

Section: Introductionmentioning

confidence: 99%

“…The Fischer‐Tropsch synthesis is a typical example, which requires a large specific heat exchanger area of up to 45 m 2 m −3 , . Accordingly, between 20 and 60 % of the cross‐sectional area is covered by the tubes , , . While a coverage of approx.…”

Section: Introductionmentioning

confidence: 99%

Comparative Hydrodynamic Analysis of Narrow and Pilot‐Scale Bubble Columns with Internals

Möller

Kipping

Schleicher

et al. 2019

Chemie Ingenieur Technik

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For a stable operation of exothermic processes in bubble column reactors, an appropriate heat control is required, e.g., through dense internal tube bundle heat exchangers. Their impact on hydrodynamic characteristics and scaling approaches is studied for columns of different scales. Two different column dimensions (DN100 and DN400) were equipped with two common tube patterns of triangular and square pitches to study local fluid dynamics. Based on geometrical tube bundle scaling quantities, hydrodynamic similarity as a scale‐up criterion with respect to average holdups, phase distributions, and local gas structures can be reached.

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Heat transfer in two- and three-phase bubble column reactors with internals

Cited by 32 publications

References 16 publications

Models for the Numerical Simulation of Bubble Columns: A Review

Models for the Numerical Simulation of Bubble Columns: A Review

Two-Bubble Class Approach Based on Measured Bubble Size Distribution for Bubble Columns with and without Internals

Comparative Hydrodynamic Analysis of Narrow and Pilot‐Scale Bubble Columns with Internals

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