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Thermal Analysis and Kinetic Modeling of Pyrolysis and Oxidation of Hydrochars

Author

Listed:
  • Gabriella Gonnella

    (Department of Civil, Environmental and Mechanical Engineering, University of Trento, 38123 Trento, Italy)

  • Giulia Ischia

    (Department of Civil, Environmental and Mechanical Engineering, University of Trento, 38123 Trento, Italy)

  • Luca Fambri

    (Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy)

  • Luca Fiori

    (Department of Civil, Environmental and Mechanical Engineering, University of Trento, 38123 Trento, Italy)

Abstract

This study examines the kinetics of pyrolysis and oxidation of hydrochars through thermal analysis. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) techniques were used to investigate the decomposition profiles and develop two distributed activation energy models (DAEM) of hydrochars derived from the hydrothermal carbonization of grape seeds produced at different temperatures (180, 220, and 250 °C). Data were collected at 1, 3, and 10 °C/min between 30 and 700 °C. TGA data highlighted a decomposition profile similar to that of the raw biomass for hydrochars obtained at 180 and 220 °C (with a clear distinction between oil, cellulosic, hemicellulosic, and lignin-like compounds), while presenting a more stable profile for the 250 °C hydrochar. DSC showed a certain exothermic behavior during pyrolysis of hydrochars, an aspect also investigated through thermodynamic simulations in Aspen Plus. Regarding the DAEM, according to a Gaussian model, the severity of the treatment slightly affects kinetic parameters, with average activation energies between 193 and 220 kJ/mol. Meanwhile, the Miura–Maki model highlights the distributions of the activation energy and the pre-exponential factor during the decomposition.

Suggested Citation

  • Gabriella Gonnella & Giulia Ischia & Luca Fambri & Luca Fiori, 2022. "Thermal Analysis and Kinetic Modeling of Pyrolysis and Oxidation of Hydrochars," Energies, MDPI, vol. 15(3), pages 1-21, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:950-:d:736400
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    References listed on IDEAS

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    1. Roberta Ferrentino & Fabio Merzari & Luca Fiori & Gianni Andreottola, 2020. "Coupling Hydrothermal Carbonization with Anaerobic Digestion for Sewage Sludge Treatment: Influence of HTC Liquor and Hydrochar on Biomethane Production," Energies, MDPI, vol. 13(23), pages 1-19, November.
    2. Alexandre D’Lamare Maia de Medeiros & Cláudio José Galdino da Silva Junior & Julia Didier Pedrosa de Amorim & Helenise Almeida do Nascimento & Attilio Converti & Andréa Fernanda de Santana Costa & Leo, 2021. "Biocellulose for Treatment of Wastewaters Generated by Energy Consuming Industries: A Review," Energies, MDPI, vol. 14(16), pages 1-19, August.
    3. Li, Jie & Pan, Lanjia & Suvarna, Manu & Tong, Yen Wah & Wang, Xiaonan, 2020. "Fuel properties of hydrochar and pyrochar: Prediction and exploration with machine learning," Applied Energy, Elsevier, vol. 269(C).
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    1. Janaki Komandur & Abhishek Kumar & Preethi Para & Kaustubha Mohanty, 2022. "Kinetic Parameters Estimation of Thermal and Co-Pyrolysis of Groundnut De-oiled Cake and Polyethylene Terephthalate (PET) Waste," Energies, MDPI, vol. 15(20), pages 1-12, October.
    2. Xiangxi Wang & Zhenzhong Hu & Inamullah Mian & Omar D. Dacres & Jian Li & Bo Wei & Mei Zhong & Xian Li & Noor Rahman & Guangqian Luo & Hong Yao, 2022. "Gasification Kinetics of Organic Solid Waste Pellets: Comparative Study Using Distributed Activation Energy Model and Coats–Redfern Method," Energies, MDPI, vol. 15(24), pages 1-12, December.
    3. M. Toufiq Reza, 2022. "Hydrothermal Carbonization," Energies, MDPI, vol. 15(15), pages 1-3, July.
    4. Bartłomiej Igliński & Wojciech Kujawski & Urszula Kiełkowska, 2023. "Pyrolysis of Waste Biomass: Technical and Process Achievements, and Future Development—A Review," Energies, MDPI, vol. 16(4), pages 1-26, February.

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