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Thermodynamic analysis of small-scale polygeneration systems producing natural gas, electricity, heat, and carbon dioxide from biomass

Elie Antar and Étienne Robert

Article (2024)

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Abstract

Agricultural greenhouses are still heavily dependent on fossil fuel-based products despite the abundant residual biomass at their disposal. This paper presents two novel decentralized systems that can convert biomass simultaneously into synthetic natural gas (SNG), electricity, useful heat, and a CO₂-rich stream. To do so, the electricity and H₂/O₂ production features of reversible solid oxide cells (RSOCs) are exploited. A steam dual fluidized bed (DFB) gasifier is used in the first proposed system, while the second one adopts a simpler oxygen/steam-blown downdraft gasification approach. Thermodynamic simulations using Aspen Plus software reveal that the total polygeneration process efficiency could reach 86.6%, with a CO₂ generation capacity exceeding 275g per kilogram of biomass input. If not used inside the greenhouse atmosphere to enhance crop growth, this high-purity CO₂ stream could be sequestered/liquefied to render the process carbon negative. The flexibility of the polygeneration systems is investigated through parametric analysis, where maximum SNG efficiencies that are on par with large-scale plants are obtained. The possibility of storing surplus electricity from intermittent sources as chemical energy in SNG is also highlighted.

Uncontrolled Keywords

polygeneration systems; biomass gasification; synthetic natural gas; reversible fuel cells

Subjects: 2100 Mechanical engineering > 2100 Mechanical engineering
2300 Fuel and energy technology > 2301 Petroleum-based and fossil fuels
Department: Department of Mechanical Engineering
Funders: CRSNG/NSERC, Trottier Energy Institute, Fonds de Recherche du Québec - Nature et Technologies (FRQNT) - Doctoral scholarship
Grant number: PGSD3 - 546588–2020
PolyPublie URL: https://publications.polymtl.ca/57328/
Journal Title: Energy (vol. 290)
Publisher: Elsevier
DOI: 10.1016/j.energy.2024.130278
Official URL: https://doi.org/10.1016/j.energy.2024.130278
Date Deposited: 12 Feb 2024 09:29
Last Modified: 05 Apr 2024 13:42
Cite in APA 7: Antar, E., & Robert, É. (2024). Thermodynamic analysis of small-scale polygeneration systems producing natural gas, electricity, heat, and carbon dioxide from biomass. Energy, 290, 130278 (13 pages). https://doi.org/10.1016/j.energy.2024.130278

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