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Comparative Studies on Water- and Vapor-Based Hydrothermal Carbonization: Process Analysis

Author

Listed:
  • Kyoung S. Ro

    (USDA-ARS Coastal Plains Soil, Water & Plant Research Center, Florence, SC 29501, USA)

  • Judy A. Libra

    (Leibniz Institute for Agricultural Engineering and Bioeconomy, 14469 Potsdam, Germany)

  • Andrés Alvarez-Murillo

    (Department of Applied Physics, School of Industrial Engineering, University of Extremadura, 06006 Badajoz, Spain)

Abstract

Hydrothermal carbonization (HTC) reactor systems used to convert wet organic wastes into value-added hydrochar are generally classified in the literature as liquid water-based (HTC) or vapor-based (VTC). However, the distinction between the two is often ambiguous. In this paper, we present a methodological approach to analyze process conditions for hydrothermal systems. First, we theoretically developed models for predicting reactor pressure, volume fraction of liquid water and water distribution between phases as a function of temperature. The reactor pressure model predicted the measured pressure reasonably well. We also demonstrated the importance of predicting the condition at which the reactor system enters the subcooled compression liquid region to avoid the danger of explosion. To help understand water–feedstock interactions, we defined a new solid content parameter %S ( T ) based on the liquid water in physical contact with feedstock, which changes with temperature due to changes in the water distribution. Using these models, we then compared the process conditions of seven different HTC/VTC cases reported in the literature. This study illustrates that a large range of conditions need to be considered before applying the label VTC or HTC. These tools can help in designing experiments to compare systems and understand results in future HTC research.

Suggested Citation

  • Kyoung S. Ro & Judy A. Libra & Andrés Alvarez-Murillo, 2020. "Comparative Studies on Water- and Vapor-Based Hydrothermal Carbonization: Process Analysis," Energies, MDPI, vol. 13(21), pages 1-18, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:21:p:5733-:d:438883
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    References listed on IDEAS

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    1. Silvia Román & Judy Libra & Nicole Berge & Eduardo Sabio & Kyoung Ro & Liang Li & Beatriz Ledesma & Andrés Álvarez & Sunyoung Bae, 2018. "Hydrothermal Carbonization: Modeling, Final Properties Design and Applications: A Review," Energies, MDPI, vol. 11(1), pages 1-28, January.
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    Cited by:

    1. M. Toufiq Reza, 2022. "Hydrothermal Carbonization," Energies, MDPI, vol. 15(15), pages 1-3, July.

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