Modélisation chimique détaillée de la combustion de la biomasse dans les appareils de chauffage domestique en vue de réduire leurs émissions polluantes

Abstract : This thesis aims to understand and model the chemical mechanisms of biomass combustion in domestic heating appliances to reduce polluting emissions. For this purpose, a global model of combustion has been developed. This model considers both detailed chemical kinetics and heat transfer. The first part of this work consisted of developing a kinetic model to represent the devolatilization of biomass as well as the secondary gas phase combustion reactions of the species emitted during primary pyrolysis. According to the used kinetic model of pyrolysis, the biomass is characterized as a mixture of three so-called reference constituents: cellulose, hemicellulose and lignin. To know the limitations of the studied model, it has been tested on several cases of primary pyrolysis. A model of secondary pyrolysis and combustion was added to the model representing primary pyrolysis. This secondary model is composed of oxidation mechanisms for products formed by pyrolysis, such as hydroxyacetaldehyde, furan and its derivatives, furfural, anisole, guaiacol ... This secondary model, as well as the new global model developed BioPOx (Biomass Pyrolysis and Oxidation) have been tested on a large number of experimental results. In a second part, the kinetic model considering both the primary pyrolysis and the thermal cracking of the emitted gaseous species, is coupled to a simplified model of heat transfer to model the combustion of a log of wood in a stove represented by a network of ideal chemical reactors. The global model, coupling the kinetic and thermal parts, reproduces experimental results on gaseous emissions (CO, CO2, NO) obtained in a wood stove.
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Theses
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http://docnum.univ-lorraine.fr/ulprive/DDOC_T_2019_0017_DHAHAK.pdf
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https://hal.univ-lorraine.fr/tel-02130719
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Submitted on : Thursday, May 16, 2019 - 9:35:49 AM
Last modification on : Thursday, August 1, 2019 - 12:01:12 PM

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Amal Dhahak. Modélisation chimique détaillée de la combustion de la biomasse dans les appareils de chauffage domestique en vue de réduire leurs émissions polluantes. Génie des procédés. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0017⟩. ⟨tel-02130719⟩

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