MRI visualisation of two-phase flow in structured supports and trickle-bed reactors

Gladden, Lynn F.; Lim, M. H. M.; Mantle, Michael D.; Sederman, Andrew J.; Stitt, E. Hugh

doi:10.1016/s0920-5861(03)00006-3

Cited by 92 publications

(75 citation statements)

References 21 publications

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“…MRI measurements of trickle bed reactors have proven beneficial owing to the high spatial and temporal resolution that can be achieved (Anadon, Sederman, & Gladden, 2006;Gladden et al, 2010;Gladden, Lim, Mantle, Sederman, & Stitt, 2003;Sederman & Gladden, 2001. MRI can extract the distribution of gas and liquid within the three-dimensional structure of the packing.…”

Section: Hydrodynamic Studiesmentioning

confidence: 99%

Applications of tomography in bubble column and trickle bed reactors

Holland

2015

Industrial Tomography

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Section: Hydrodynamic Studiesmentioning

confidence: 99%

Applications of tomography in bubble column and trickle bed reactors

Holland

2015

Industrial Tomography

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“…Another powerful visualization technique is magnetic resonance imaging (MRI), which has just recently been introduced into process imaging [16]. MRI images the concentration of hydrogen nuclei by measuring their radio-frequency resonances in a strong magnetic field.…”

Section: Liquid Distribution Measurement Techniquesmentioning

confidence: 99%

Advanced Tomographic Techniques for Flow Imaging in Columns with Flow Distribution Packings

Schubert

Bieberle

Barthel

et al. 2011

Chemie Ingenieur Technik

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Design and optimization of separation units, e.g., distillation and absorption columns with flow distribution packings, require detailed knowledge about the internal flow conditions and their impact on the process behavior. This in turn calls for suitable measuring techniques, which can give a detailed insight into such devices, especially for studies on a laboratory and pilot scale. Traditional instrumentation, such as compartment-type liquid collectors installed below packings, or distributed temperature, pressure and conductivity probes, often falls too short if detailed knowledge on flow conditions is required. This concerns especially local liquid holdup, liquid maldistribution, liquid films thickness, wetting of the packing surface, or bubble size and droplet distribution at trays. Advanced imaging techniques, such as tomography, have found only marginal attention in investigations of separation columns with structured and modern dumped flow distribution packings, mostly due to limited spatial and temporal resolution but also due to prevailing technological problems encountered in such applications. In this study, the potentials and limits of some of the most recently emerged tomographic imaging modalities for multiphase flows have been investigated and reviewed, i.e., ultra-fast X-ray tomography, high-resolution gamma-ray tomography, wire-mesh sensor techniques, and X-ray microtomography with respect to a possible application in separation columns with flow distribution packings.

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“…NMR imaging, the technique widely used as a medical diagnostic tool, has recently been applied to chemical engineering [9,10]. In this work, MRI technique is used to map the threedimensional (3D) distribution of liquid phases in packed beds.…”

Section: Introductionmentioning

confidence: 99%

Application of Magnetic Resonance Imaging (MRI) to Determine the Influence of Fluid Dynamics on Desulfurization in Bench Scale Reactors

Nguyen¹,

Reimert²,

Hardy³

2006

Chem Eng & Technol

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The influence of fluid dynamics on the hydrodesulfurization (HDS) reactions of a diesel oil in bench-scale reactors was evaluated. The porosities and liquid saturations of catalyst beds were quantified by using the MRI technique. The gasliquid systems used in the experiments were nitrogen diesel and hydrogen diesel. An apparatus was especially constructed, allowing in situ measurements of gas and liquid distributions in packed beds at elevated pressure and temperature up to 20 bar and 200°C, respectively. The reactor itself had a length of 500 mm and an internal diameter of 19 mm. The packed beds used in this MRI study consisted of: (1) 2 mm diameter nonporous spherical glass beads and (2) 1.3 mm diameter porous Al 2 O 3 trilobes having the same size as the original trilobe catalyst used in HDS bench-scale experiments. The superficial gas and liquid velocities were set within the range of trickle flow, e.g., u 0G = 20-500 mm/s and u 0L = 0.1-6 mm/s. In parallel with the MRI experiments, the hydrodesulfurization of a gas oil was investigated in a bench-scale plant. Its reactor had the same dimensions of the trickle-bed column used in the MRI experiments and was filled with original trilobe catalyst. These catalytic experiments were carried out at a wide range of operating conditions (p = 30-80 bar, T = 300-380°C, LHSV = 1-4 h -1 ). The results of both fluid dynamic and catalytic reaction experiments were then combined for developing a simulation model to predict the HDS performance by accounting for fluid dynamic nonidealities.

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MRI visualisation of two-phase flow in structured supports and trickle-bed reactors

Cited by 92 publications

References 21 publications

Applications of tomography in bubble column and trickle bed reactors

Applications of tomography in bubble column and trickle bed reactors

Advanced Tomographic Techniques for Flow Imaging in Columns with Flow Distribution Packings

Application of Magnetic Resonance Imaging (MRI) to Determine the Influence of Fluid Dynamics on Desulfurization in Bench Scale Reactors

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