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Contacteurs à membranes composites pour le captage du CO2 en postcombustion dans des solutions ammoniacales en vue de sa valorisation sur site industriel : étude expérimentale et modélisation des étapes d'absorption et de désorption

Abstract : This work aims to evaluate the performances of hollow fiber membrane contactors used for the CO2 absorption in aqueous ammonia and the regeneration of the latter within the frame of post-combustion CO2 capture. Fibers are made of a thin dense layer coated on a microporous support, the dense layer prevent membrane wetting by liquid penetration. Both experiment and modelling were done. During absorption experiments, important decrease of the CO2 capture efficiency was observed due to ammonium salts precipitation in the gas-side corroborating results from previous works. Experiments with CO2/N2 mixture saturated with water vapor, as would be the case for flue gas, interestingly, showed stable performances of the process. A one-dimensional multi-component adiabatic transfer model for CO2 absorption in NH3 has been implemented in Aspen Custom Modeler® and validated with experimental results. The simulations performed with the model confirmed the volumetric intensification potential of the technology, however, the NH3 slip reduction expected, because of the use of a dense layer more permeable to CO2 than NH3, wasn’t satisfying. Water condensation phenomenon in membrane contactors were studied with both experiments and simulations. It was thus showed that membrane pore wetting by condensation should not happened but gas-side condensation led to an important increase of the pressure drop with the potential of increasing compression costs. Experiments and simulations of the desorption of CO2 from a loaded aqueous ammonia solution with a membrane contactor were performed and important disparities were found between CO2 flux measured and simulated. A volumetric reduction of the membrane contactor when compared to the packed column was calculated highlighting the potential of the technology for the stripping step. In collaboration with the partners of the C2B project, in which this thesis is integrated, CO2 absorption essays were carried out on site with an industrial scale membrane contactor. The results of this pilot are consistent with laboratory results and encourages the transfer of the technology to the industrial scale
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https://hal.univ-lorraine.fr/tel-01924636
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Submitted on : Friday, November 16, 2018 - 10:18:07 AM
Last modification on : Monday, March 29, 2021 - 4:06:59 PM

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  • HAL Id : tel-01924636, version 1

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Kévin Villeneuve. Contacteurs à membranes composites pour le captage du CO2 en postcombustion dans des solutions ammoniacales en vue de sa valorisation sur site industriel : étude expérimentale et modélisation des étapes d'absorption et de désorption. Génie chimique. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0223⟩. ⟨tel-01924636⟩

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