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A techno-economic assessment of bioethanol production from switchgrass through biomass gasification and syngas fermentation

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  • Regis, Francesco
  • Monteverde, Alessandro Hugo Antonio
  • Fino, Debora

Abstract

The consumption of fossil fuels, which are not economically and environmentally sustainable, can be reduced by producing biofuels, such as bioethanol. This study presents a reproducible model of the ethanol production process developed with Aspen Plus® software. The work's goal is to enhance the amount of ethanol produced per tonne of biomass and, therefore, the carbon yield of the process. The main steps of the process are the gasification of the pretreated switchgrass, the cleaning of the syngas obtained, the fermentation of the syngas to ethanol and its purification. The parameters relating to gasification were set to produce syngas with an optimal composition for the fermenter. A discounted cash flow analysis was used to determine the minimum ethanol selling price for different plant scales and H2 prices. By enriching the syngas with green H2 and adopting an optimal bioreactor, a remarkable ethanol yield of 1015.04 L/t of switchgrass can be obtained. Considering a plant size of 750,000 t/y of switchgrass, the minimum ethanol selling price is 1.07 $/L for the base scenario and is further lowered to 0.77 $/L for the 2050 H2 scenario. The potential savings of building more plants were also assessed thanks to the learning effects.

Suggested Citation

  • Regis, Francesco & Monteverde, Alessandro Hugo Antonio & Fino, Debora, 2023. "A techno-economic assessment of bioethanol production from switchgrass through biomass gasification and syngas fermentation," Energy, Elsevier, vol. 274(C).
    • Handle: RePEc:eee:energy:v:274:y:2023:i:c:s0360544223007120
    DOI: 10.1016/j.energy.2023.127318
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    References listed on IDEAS

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    1. Tamás Mizik & Lajos Nagy & Zoltán Gabnai & Attila Bai, 2020. "The Major Driving Forces of the EU and US Ethanol Markets with Special Attention Paid to the COVID-19 Pandemic," Energies, MDPI, vol. 13(21), pages 1-22, October.
    2. Hanno Richter & Michael E. Martin & Largus T. Angenent, 2013. "A Two-Stage Continuous Fermentation System for Conversion of Syngas into Ethanol," Energies, MDPI, vol. 6(8), pages 1-14, August.
    3. Panwar, N.L. & Kaushik, S.C. & Kothari, Surendra, 2011. "Role of renewable energy sources in environmental protection: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(3), pages 1513-1524, April.
    4. Hoseinzade, Leila & Adams, Thomas A., 2019. "Techno-economic and environmental analyses of a novel, sustainable process for production of liquid fuels using helium heat transfer," Applied Energy, Elsevier, vol. 236(C), pages 850-866.
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