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Modeling and design of microalgae production process

Authors: Lucchetti, Aurélie;

Modeling and design of microalgae production process

Abstract

Microalgae are more and more studied for their energy potential and various applications. However, the actual production processes (open and closed photobioreactor) use a lot of energy and aren't productive enough. This thesis presents a novel process of microalgae culture, with an airlift system coupled to a thin plate. The photobioreactor is experimentally characterized and modeled for many aspects. Hydrodynamics of the system is modeled to predict the fluid behavior in the system. Mass transfers are modeled using the two film model. The model allows knowing minimum carbon needs for microalgae culture. It also allows evaluating dissolved oxygen concentration in the photobioreactor and its elimination efficiency. Oxygen is inhibiting the culture at high concentration. Heat transfers are also modeled, allowing to know climate parameters impact (sunshine, ambient air temperature) on culture temperature. All models are assembled in a global model. This model is compared to microalgae culture experimental results. Finally, the global model is used to study a more complex system: culture thin plates are integrated on the walls of buildings. Global model allow studying different orientation effects on temperature and productivity of the system. Culture is optimized for energy consumption and some perspectives on energy integration of such a system are proposed. Les microalgues sont de plus en plus regardées pour leurs potentiels énergétiques et leurs nombreuses applications. Mais les systèmes de production actuels, que se soit les systèmes dits ouvert comme les bassins ou les systèmes fermés, appelés photobioréacteurs, sont très énergivores et pas assez productifs. Cette thèse propose un nouveau concept de photobioréacteur, composé d'un airlift et d'une plaque mince. Le photobioréacteur est caractérisé expérimentalement et est modélisé sous plusieurs aspects. L'hydrodynamique du système est modélisée pour prédire le comportement des fluides dans le système. Les phénomènes de transferts de masse sont modélisés par le modèle des deux films. La modélisation permet de connaitre l'apport minimum nécessaire en dioxyde de carbone pour la culture des microalgues et permet d'évaluer la concentration en oxygène dissous dans le photobioréacteur. Elle permet aussi d'évaluer son élimination par le système, l'oxygène étant inhibant pour la culture. Les phénomènes de transferts de chaleur sont aussi modélisés, permettant de connaitre l'impact des différents paramètres (ensoleillement, température de l'air ambiant) sur la température de culture. Ces différents modèles sont rassemblés en un modèle global qui est comparé aux résultats expérimentaux de culture d'algues. Le modèle global est ensuite utilisé dans un contexte plus complexe : l'intégration des plaques minces du photobioréacteur aux parois d'un bâtiment. Le modèle global permettra d'étudier l'effet les différentes orientations (Nord, Sud, Est, Ouest en vertical sur les façades et à l'horizontal sur les toits) sur les températures et productivité du système. La consommation d'énergie de la culture est optimisée grâce au modèle. A la suite de cette optimisation, certaines perspectives sur l'intégration énergétique d'un tel système sont proposées.

Country
France
Keywords

Transfert de masse, Light distribution, Photobioreactor, Modèle de croissance, [ SPI.GPROC ] Engineering Sciences [physics]/Chemical and Process Engineering, Growth model, Energy integration, Hydrodynamique, Heat transfer, Intégration énergétique, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Mass transfer, Microalgues, Photobioréacteur

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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