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The Influence of Residence Time during Hydrothermal Carbonisation of Miscanthus on Bio-Coal Combustion Chemistry

Author

Listed:
  • Aidan M. Smith

    (School of Biological and Chemical Engineering, Aarhus University, Hangøvej 2, 8200 Aarhus, Denmark)

  • Andrew B. Ross

    (School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK)

Abstract

Miscanthus was treated by hydrothermal carbonisation in a 2-L batch reactor at 200 °C and 250 °C with residence times ranging between 0 and 24 h to understand the impact of residence time has on the resulting bio-coal combustion chemistry. Increasing the residence time results in dehydration of the bio-coal and increased repolymerisation; however, temperature has the greatest influence on bio-coal properties. After 24 h at 200 °C, bio-coal has similar properties to that of the 250 °C + 0 h bio-coal. After 1 h at 250 °C, the cellulose present in the raw biomass appears to be largely removed. The removal of cellulose and the associated dehydration and repolymerisation results in bio-coal having a ‘coal like’ combustion profile, which exhibits a decreasing reactivity with increasing residence time. At 200 °C + 0 h, 75% of the alkali metal is removed, increasing to 86% with increasing residence time. Further extraction is seen at 250 °C. Phosphorus and sulphur appear to undergo substantial extraction at 200 °C + 0 h but then are reincorporated with increasing residence time. The calcium content increases in the bio-coal with increasing residence time at 200 °C but then reduces after 1 h at 250 °C. Increasing temperature and residence time has been shown to decrease the fuels’ fouling and slagging propensity.

Suggested Citation

  • Aidan M. Smith & Andrew B. Ross, 2019. "The Influence of Residence Time during Hydrothermal Carbonisation of Miscanthus on Bio-Coal Combustion Chemistry," Energies, MDPI, vol. 12(3), pages 1-21, February.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:3:p:523-:d:204081
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    References listed on IDEAS

    as
    1. Monica Puccini & Lucia Ceccarini & Daniele Antichi & Maurizia Seggiani & Silvia Tavarini & Marisa Hernandez Latorre & Sandra Vitolo, 2018. "Hydrothermal Carbonization of Municipal Woody and Herbaceous Prunings: Hydrochar Valorisation as Soil Amendment and Growth Medium for Horticulture," Sustainability, MDPI, vol. 10(3), pages 1-16, March.
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    Cited by:

    1. Aaron E. Brown & Jessica M. M. Adams & Oliver R. Grasham & Miller Alonso Camargo-Valero & Andrew B. Ross, 2020. "An Assessment of Different Integration Strategies of Hydrothermal Carbonisation and Anaerobic Digestion of Water Hyacinth," Energies, MDPI, vol. 13(22), pages 1-26, November.
    2. Urbanowska, Agnieszka & Niedzwiecki, Lukasz & Wnukowski, Mateusz & Aragon-Briceño, Christian & Kabsch-Korbutowicz, Małgorzata & Baranowski, Marcin & Czerep, Michał & Seruga, Przemysław & Pawlak-Krucze, 2023. "Recovery of chemical energy from retentates from cascade membrane filtration of hydrothermal carbonisation effluent," Energy, Elsevier, vol. 284(C).
    3. Aidan Mark Smith & Ugochinyere Ekpo & Andrew Barry Ross, 2020. "The Influence of pH on the Combustion Properties of Bio-Coal Following Hydrothermal Treatment of Swine Manure," Energies, MDPI, vol. 13(2), pages 1-20, January.
    4. Kiran R. Parmar & Andrew B. Ross, 2019. "Integration of Hydrothermal Carbonisation with Anaerobic Digestion; Opportunities for Valorisation of Digestate," Energies, MDPI, vol. 12(9), pages 1-17, April.
    5. Aaron E. Brown & James M. Hammerton & Miller Alonso Camargo-Valero & Andrew B. Ross, 2022. "Integration of Hydrothermal Carbonisation and Anaerobic Digestion for the Energy Valorisation of Grass," Energies, MDPI, vol. 15(10), pages 1-21, May.

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