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Theses

Conceptions optimales de réacteurs à lit fixe par fabrication additive

Abstract : This thesis is a prospective work which aims to apply in Chemical Engineering shape optimization methods developed in other areas of engineering. The first part of this work is dedicated to the development of a shape optimization method to determine the optimal configuration of a two-dimensional packed reactor with a single phase liquid flow. The developed method is then applied to determine the shape of the reactor packing that minimizes the energy dissipation in the fluid due to viscous friction, the average outlet concentration of reactant, or both simultaneously using multi-objective optimization. The optimal configurations determined are satisfactory and allow a significant improvement of the conversion rate or the energy losses in the reactor. In a second part, an experimental campaign was carried out in order to validate the CFD simulation performed by OpenFOAM software, required by the developed shape optimization approach and modeling the fluid flow and reactions involved in the reactor. For this purpose, scale 1 prototypes of the initial and optimal reactors have been manufactured by 3D printing in order to experiment them. The experimental campaign is based on 3 measurement techniques, the PIV (Particle Image Velocimetry), the measurement of RTD (Residence Time Distribution) and the measurement of the conversion rate at the reactor outlet. Finally, it has been shown that the optimization of the reactor in its 2D form allows a significant improvement of its performance even if the determined configuration is probably sub-optimal. Indeed, after comparing the experimental measurements with 2D and 3D simulations, it has been found that the 3D simulation is more representative of reality than the 2D simulation. Thus, optimizing the reactor in its 3D form would be an interesting perspective for the future works, provided the problem of constraints related to the reactor additive manufacturing step is fixed.
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https://hal.univ-lorraine.fr/tel-03176170
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Submitted on : Monday, March 22, 2021 - 10:59:58 AM
Last modification on : Monday, March 29, 2021 - 4:07:31 PM

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  • HAL Id : tel-03176170, version 1

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Alexis Courtais. Conceptions optimales de réacteurs à lit fixe par fabrication additive. Génie des procédés. Université de Lorraine, 2021. Français. ⟨NNT : 2021LORR0003⟩. ⟨tel-03176170⟩

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