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Dielectric Properties of Biomass/Biochar Mixtures at Microwave Frequencies

Author

Listed:
  • Candice Ellison

    (Biological and Agricultural Engineering, Louisiana State University, 149 E. B. Doran, Baton Rouge, LA 70803, USA)

  • Murat Sean McKeown

    (College of Engineering, University of Georgia, 597 D. W. Brooks Dr., Athens, GA 30602, USA)

  • Samir Trabelsi

    (U. S. Department of Agriculture, Agricultural Research Service, Russell Research Center, 950 College Station Rd., Athens, GA 30605, USA)

  • Dorin Boldor

    (Biological and Agricultural Engineering, Louisiana State University, 149 E. B. Doran, Baton Rouge, LA 70803, USA)

Abstract

Material dielectric properties are important for understanding their response to microwaves. Carbonaceous materials are considered good microwave absorbers and can be mixed with dry biomasses, which are otherwise low-loss materials, to improve the heating efficiency of biomass feedstocks. In this study, dielectric properties of pulverized biomass and biochar mixtures are presented from 0.5 GHz to 20 GHz at room temperature. An open-ended coaxial-line dielectric probe and vector network analyzer were used to measure dielectric constant and dielectric loss factor. Results show a quadratic increase of dielectric constant and dielectric loss with increasing biochar content. In measurements on biochar, a strong dielectric relaxation is observed at 8 GHz as indicated by a peak in dielectric loss factor at that frequency. Biochar is found to be a good microwave absorber and mixtures of biomass and biochar can be utilized to increase microwave heating rates for high temperature microwave processing of biomass feedstocks. These data can be utilized for design, scale-up and simulation of microwave heating processes of biomass, biochar, and their mixtures.

Suggested Citation

  • Candice Ellison & Murat Sean McKeown & Samir Trabelsi & Dorin Boldor, 2017. "Dielectric Properties of Biomass/Biochar Mixtures at Microwave Frequencies," Energies, MDPI, vol. 10(4), pages 1-11, April.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:4:p:502-:d:95332
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    References listed on IDEAS

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    1. Motasemi, F. & Afzal, Muhammad T., 2013. "A review on the microwave-assisted pyrolysis technique," Renewable and Sustainable Energy Reviews, Elsevier, vol. 28(C), pages 317-330.
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    Cited by:

    1. Siddique, Istiaq Jamil & Salema, Arshad Adam & Antunes, Elsa & Vinu, Ravikrishnan, 2022. "Technical challenges in scaling up the microwave technology for biomass processing," Renewable and Sustainable Energy Reviews, Elsevier, vol. 153(C).
    2. Rositsa Velichkova & Martin Pushkarov & Radostina A. Angelova & Ognyan Sandov & Detelin Markov & Iskra Simova & Peter Stankov, 2022. "Exploring the Potential of Straw Biochar for Environmentally Friendly Fertilizers," Sustainability, MDPI, vol. 14(10), pages 1-21, May.
    3. Ellison, Candice Raffaela & Hoff, Ryan & Mărculescu, Cosmin & Boldor, Dorin, 2020. "Investigation of microwave-assisted pyrolysis of biomass with char in a rectangular waveguide applicator with built-in phase-shifting," Applied Energy, Elsevier, vol. 259(C).
    4. Surup, Gerrit Ralf & Hunt, Andrew J. & Attard, Thomas & Budarin, Vitaliy L. & Forsberg, Fredrik & Arshadi, Mehrdad & Abdelsayed, Victor & Shekhawat, Dushyant & Trubetskaya, Anna, 2020. "The effect of wood composition and supercritical CO2 extraction on charcoal production in ferroalloy industries," Energy, Elsevier, vol. 193(C).
    5. Mejdi Jeguirim & Lionel Limousy, 2017. "Biomass Chars: Elaboration, Characterization and Applications," Energies, MDPI, vol. 10(12), pages 1-7, December.

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