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Development of surface torrefaction process to utilize agro-byproducts as an energy source

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  • Kim, Seok Jun
  • Park, Sunyong
  • Oh, Kwang Cheol
  • Ju, Young Min
  • Cho, La hoon
  • Kim, Dae Hyun

Abstract

In this study, to improve the fuel characteristics of unused agro-byproducts and utilize these as an energy source after pelletizing, a thermochemical process termed as surface torrefaction was developed. After torrefaction, the amount of available energy and energy yield decreased due to mass reduction. Thus, surface torrefaction minimized the amount of input energy and energy yield. During this process, the carbonized surface of pellets and any moisture was removed from inside the pellet which is advantageous for storage and transportation. Changes in color and physiochemical characteristics were also observed. The calorific value and moisture content of the wood pellet (WP) and pepper stem pellet (PP) before surface torrefaction were 20.1 MJ kg−1 and 8% and 18.1 MJ kg−1 and 6.5%, respectively. After surface torrefaction, the WP and PP calorific values and energy yields were: 20.3–20.7 MJ kg−1 and 87.3–92.5%, and 18.5–20.1 MJ kg−1 and 86.8–95.9%, respectively. After torrefaction and surface torrefaction, the change in mass yield and fuel characteristics were compared. The optimal conditions for WP and PP treatments, considering hygroscopicity, calorific value, and energy yield, were determined as 300 °C for 4.5 min and 300 °C for 5 min, respectively at surface torrefaction.

Suggested Citation

  • Kim, Seok Jun & Park, Sunyong & Oh, Kwang Cheol & Ju, Young Min & Cho, La hoon & Kim, Dae Hyun, 2021. "Development of surface torrefaction process to utilize agro-byproducts as an energy source," Energy, Elsevier, vol. 233(C).
    • Handle: RePEc:eee:energy:v:233:y:2021:i:c:s0360544221014407
    DOI: 10.1016/j.energy.2021.121192
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    References listed on IDEAS

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    Cited by:

    1. Kim, Seok Jun & Park, Sun Yong & Oh, Kwang Cheol & Cho, La hoon & Jeon, Young Kwang & Kim, Dae Hyun, 2023. "Improvement of fuel characteristics for forest by-products applied surface torrefaction process," Energy, Elsevier, vol. 284(C).
    2. Sun Yong Park & Seok Jun Kim & Kwang Cheol Oh & La Hoon Cho & Young Kwang Jeon & Dae Hyun Kim, 2023. "Evaluation of the Optimal Conditions for Oxygen-Rich and Oxygen-Lean Torrefaction of Forestry Byproduct as a Fuel," Energies, MDPI, vol. 16(12), pages 1-19, June.
    3. Muhammet Enes Önür & Kamil Ekinci & Mihriban Civan & Mehmet Emin Bilgili & Sema Yurdakul, 2023. "Quality Properties and Torrefaction Characteristics of Pellets: Rose Oil Distillation Solid Waste and Red Pine Sawdust," Sustainability, MDPI, vol. 15(14), pages 1-16, July.

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