Étude du procédé de méthanation en digesteur anaérobie à l'échelle pilote : impact du mélange et du transfert gaz-liquide sur les performances de production de biogaz

Abstract : Anaerobic digestion is the bioconversion of organic matter into digestate and biogas. Biological methanation consists in the reaction between H2 and CO2 in anaerobic digester to increase the level of CH4 in the biogas. This thesis aims at recovering the fumes from coking plants containing CO2 and H2 by injection into an anaerobic digester. The objective of this thesis is to study the feasibility of injecting coke oven gases into an anaerobic digester and to quantify the variations of the CH4 content. To this end, a 100 L reactor has been designed. Previous studies in 2 L reactor were performed experimentally and by computational fluid dynamics to define a suitable design of stirrer. It has been shown that stirring by a double helical ribbon increases the biogas production rate by 50 % in comparison with a conventional stirring system. Membrane permeation through a silicone tube was used to inject the gas into the digestate. 152 days experiment was performed in this pilot with a continuous hydrogenation step prior to the simultaneous injection of H2 and CO2. Injection of pure hydrogen increased the CH4 level from 57.5 % to 68.2 % and decreased that of CO2 from 42.3 to 31.5 %. The injected hydrogen is entirely consumed. This result validated the choice of membrane permeation as a gas supply system in viscous medium but showed that the amount of H2 injected was limiting. The additional injection of CO2 in proportions of coke oven gases resulted in an increase in the overall biogas flow rate from 5.0 to 5.6 L h-1, composed of about 35 % CO2 and 65 % CH4
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Theses
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http://docnum.univ-lorraine.fr/ulprive/DDOC_T_2017_0336_LEBRANCHU.pdf
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https://hal.univ-lorraine.fr/tel-01916424
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Submitted on : Thursday, November 8, 2018 - 2:20:30 PM
Last modification on : Friday, November 9, 2018 - 1:18:07 AM

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  • HAL Id : tel-01916424, version 1

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Aline Lebranchu. Étude du procédé de méthanation en digesteur anaérobie à l'échelle pilote : impact du mélange et du transfert gaz-liquide sur les performances de production de biogaz. Génie des procédés. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0336⟩. ⟨tel-01916424⟩

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