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Article Dans Une Revue Energy Année : 2022

Design and validation of reactant feeding control strategies for the solar-autothermal hybrid gasification of woody biomass

Résumé

Several hybridization strategies of a solar-autothermal biomass gasifier were examined for stable and continuous operation under variable solar irradiation. The ultimate objective was to demonstrate the feasibility of controlled syngas production, through the modification of oxygen, water, and biomass injection rates. Various hybridization strategies were probed by thermodynamic analysis and experimentally validated. Thermodynamic equilibrium calculations detailed the impact of both H 2 O and O 2 injection rates on the produced syngas composition under constant wood feeding. Oxygen injection decreased the H 2 :CO molar ratio, while reducing the solar thermal power required to carry out the gasification reaction. Meanwhile, the total H 2 +CO production dropped by 1.36 mole of H 2 and 0.64 mole of CO per mole of O 2 added, independently of the quantity of water provided. Validation experiments were then carried out under real concentrated solar flux in a directly-irradiated conical spouted-bed reactor, following distinct hybridization paths. Maintaining constant the H 2 :CO ratio above 1 during hybridization required to provide high amounts of water steam with oxygen, which penalized the gasifier efficient heating. In contrast, minimizing the water injection rate throughout hybridization strongly altered the H 2 :CO ratio but decreased the CO 2 production and the solar thermal power requirement. Finally, the successful control of the outlet H 2 +CO volume flow rate with simultaneous oxygen and wood injection was demonstrated (under constant water feeding rate). Solarto-fuel efficiencies were kept around 20%, while hybridization decreased the cold-gas efficiency below 80%.
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Dates et versions

hal-03697046 , version 1 (16-06-2022)

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Axel Curcio, Sylvain Rodat, Valéry Vuillerme, Stéphane Abanades. Design and validation of reactant feeding control strategies for the solar-autothermal hybrid gasification of woody biomass. Energy, 2022, 254, Part C, pp.124481. ⟨10.1016/j.energy.2022.124481⟩. ⟨hal-03697046⟩
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