Local liquid saturation measurements inside a trickle bed reactor operating near the transition between pulsing and trickling flow

Llamas, Juan-David; Lesage, François; Wild, Gabriel

doi:10.1016/j.ces.2007.08.038

Cited by 10 publications

(2 citation statements)

References 7 publications

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“…Figure 5a shows that the pulse frequency increases as a function of the gas and liquid superficial velocities. This trend, which is consistent with literature observations, [23][24][25][26] is justified in the following manner: For a given gas flow rate, any excess liquid above the transition liquid flow rate contributes to pulses, with more excess liquid generating more pulses. For a given liquid flow rate, increasing the gas flow rate decreases mean liquid holdup, and the excess liquid requires an increasing number of pulses.…”

Section: Clean Bed Experimentssupporting

confidence: 91%

Monitoring Filtration in Trickle Beds Using Electrical Capacitance Tomography

Hamidipour

Larachi

Ring

2008

Ind. Eng. Chem. Res.

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Experiments were carried out to monitor the evolution of the deposition of fine particles in trickle-bed reactors during the flow of nonpolar hydrocarbon oil-like liquid suspensions using electrical capacitance tomography (ECT) imaging. The accuracy of the ECT rendition was validated in the pristine (i.e., deposit-free) bed state by comparing the liquid holdup measurements from ECT with the liquid holdup from residence time distribution (RTD) measurements. The pulse-flow characteristics (pulse velocity and frequency) estimated from the ECT signals were in agreement with existing literature data. For filtration experiments, the effects of the initial liquid suspension distribution, the gas and liquid superficial velocities, and single-phase flow (i.e., zero gas velocity) on the structure of the deposition in the bed were studied. ECT imaging successfully tracked the unsteady-state progression of bed plugging throughout the trickle bed. It was found that increasing the liquid or gas superficial velocity resulted in increased local deposition. The transition, due to deposition, from trickle to pulse flow was also determined from ECT. In the case of stagnant gas, a filter cake formed on top of the bed.

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Section: Clean Bed Experimentssupporting

confidence: 91%

Monitoring Filtration in Trickle Beds Using Electrical Capacitance Tomography

Hamidipour

Larachi

Ring

2008

Ind. Eng. Chem. Res.

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“…, the Chemical Engineering Group at ENSIC CNRS in Nancy (Professor Wild) applied a similar WMS technique for the first time in a trickle‐bed reactor . They measured liquid fractions and their distribution , , local flow regime transition at individual sensing points of the sensor as well as radial liquid spreading . The device, however, was not applicable to porous particle packings and organics liquid, which are commonly present in trickle‐bed reactors.…”

Section: Flow Analysis In Packed Beds With Wire‐mesh Sensorsmentioning

confidence: 99%

Liquid Flow Visualization in Packed‐Bed Multiphase Reactors: Wire‐Mesh Sensor Design and Data Analysis for Rotating Fixed Beds

Timaeus

Berger

Schleicher

et al. 2019

Chemie Ingenieur Technik

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Wire‐mesh sensors are increasingly used for flow imaging in packed beds. In this study, a capacitance wire‐mesh sensor is applied to measure the cross‐sectional liquid phase distribution in a rotating fixed‐bed reactor. The liquid filling level is derived as a crucial parameter defining the operational window of the reactor concept. Contrary to the standard sensor configuration, wireless data transfer and autonomous power supply is integrated. Furthermore, appropriate data processing is required to visualize the liquid flow of the three‐phase system (nitrogen, cumene and γ‐Al2O3 particles).

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Process intensification of gas–liquid downflow and upflow packed beds by a new low‐shear rotating reactor concept

et al. 2016

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In the present work, a new low‐shear rotating reactor concept was introduced for process intensification of heterogeneous catalytic reactions in cocurrent gas–liquid downflow and upflow packed‐bed reactors. To properly assess potential advantages of this new reactor concept, exhaustive hydrodynamic experiments were carried out using embedded low‐intrusive wire mesh sensors. The effect of the rotational velocity on liquid flow patterns in the bed cross‐section, liquid saturation, pressure drop, and regime transition was investigated. Furthermore, liquid residence time and Péclet number estimated by a stimulus‐response technique and a macro‐mixing model were presented and discussed with respect to the prevailing flow patterns. The results revealed that the column rotation induces different flow patterns in the cross‐section of the packed bed operating in a concurrent downflow or upflow mode. Moreover, the new reactor concept exhibits a more flexible adjustment of pressure drop, liquid saturation, liquid residence time, and back‐mixing at constant flow rates. © 2016 American Institute of Chemical Engineers AIChE J, 63: 283–294, 2017

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Local liquid saturation measurements inside a trickle bed reactor operating near the transition between pulsing and trickling flow

Cited by 10 publications

References 7 publications

Monitoring Filtration in Trickle Beds Using Electrical Capacitance Tomography

Monitoring Filtration in Trickle Beds Using Electrical Capacitance Tomography

Liquid Flow Visualization in Packed‐Bed Multiphase Reactors: Wire‐Mesh Sensor Design and Data Analysis for Rotating Fixed Beds

Process intensification of gas–liquid downflow and upflow packed beds by a new low‐shear rotating reactor concept

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