Measuring Volumetric Phase Fractions in a Gas-Solid-Liquid Stirred Tank Reactor Using an Impedance Probe

Authors

  • Elisabetta Brunazzi,

    Corresponding author
    1. Laboratory of Process Equipment, Department of Chemical Engineering, Industrial Chemistry and Materials Science, University of Pisa, Via Diotisalvi 2, I-56126 Pisa, Italy
    • Laboratory of Process Equipment, Department of Chemical Engineering, Industrial Chemistry and Materials Science, University of Pisa, Via Diotisalvi 2, I-56126 Pisa, Italy
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  • Umberto Di Festa,

    1. Laboratory of Process Equipment, Department of Chemical Engineering, Industrial Chemistry and Materials Science, University of Pisa, Via Diotisalvi 2, I-56126 Pisa, Italy
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  • Chiara Galletti,

    1. Laboratory of Process Equipment, Department of Chemical Engineering, Industrial Chemistry and Materials Science, University of Pisa, Via Diotisalvi 2, I-56126 Pisa, Italy
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  • Cesare Merello,

    1. Laboratory of Process Equipment, Department of Chemical Engineering, Industrial Chemistry and Materials Science, University of Pisa, Via Diotisalvi 2, I-56126 Pisa, Italy
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  • Alessandro Paglianti,

    1. Laboratory of Process Equipment, Department of Chemical Engineering, Industrial Chemistry and Materials Science, University of Pisa, Via Diotisalvi 2, I-56126 Pisa, Italy
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  • Sandro Pintus

    1. Laboratory of Process Equipment, Department of Chemical Engineering, Industrial Chemistry and Materials Science, University of Pisa, Via Diotisalvi 2, I-56126 Pisa, Italy
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Abstract

A probe based on the measurement of the electrical impedance has been developed to determine the phase hold-ups in gas-solid-liquid stirred tank reactors. The idea was to take advantage of the complex nature of electrical impedance to derive two independent data (conductance and capacitance) from one measurement. Particular attention has been paid to the calibration of the probe and two semi-empirical equations have been given to relate measurement to hold-ups. Subsequently, experiments were performed on three-phase and two-phase (gas-liquid and solid-liquid) systems and the results have been critically analysed.

Abstract

On a mis au point une sonde de mesures d'impédance électrique pour déterminer la rétention des phases dans des réacteurs à réservoirs agités gaz-solides-liquide. L'idée était de tirer profit de la nature complexe de l'impédance électrique dans le but de calculer deux données distinctes (conductance et capitance) à partir d'une mesure. On a porté une attention particulière à l'étalonnage de la sonde et deux équations semi-empiriques sont proposées pour relier les mesures aux rétentions. Par la suite, des expériences ont été menées sur des systèmes triphasiques et diphasiques (gaz-liquide et liquide-solides) et les résultats sont examinés de manière critique.

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