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Integration of Air Classification and Hydrothermal Carbonization to Enhance Energy Recovery of Corn Stover

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Listed:
  • Md Tahmid Islam

    (Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, 150 W University Boulevard, Melbourne, FL 32901, USA)

  • Nepu Saha

    (Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, 150 W University Boulevard, Melbourne, FL 32901, USA)

  • Sergio Hernandez

    (Biomass Characterization Department, Idaho National Laboratory, 2525 Fremont Ave, Idaho Falls, Idaho, ID 83402, USA)

  • Jordan Klinger

    (Biomass Characterization Department, Idaho National Laboratory, 2525 Fremont Ave, Idaho Falls, Idaho, ID 83402, USA)

  • M. Toufiq Reza

    (Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, 150 W University Boulevard, Melbourne, FL 32901, USA)

Abstract

Air classification (AC) is a cost-effective technology that separates the energy-dense light ash fraction (LAF) from the inorganic-rich high ash fraction (HAF) of corn stover. HAF could be upgraded into energy-dense solid fuel by hydrothermal carbonization (HTC). However, HTC is a high-temperature, high-pressure process, which requires additional energy to operate. In this study, three different scenarios (i.e., AC only, HTC only, and integrated AC–HTC) were investigated for the energy recovery of corn stover. AC was performed on corn stover at an 8 Hz fan speed, which yielded 84.4 wt. % LAF, 12.8 wt. % HAF, and 2.8 wt. % below screen particles. About 27 wt. % ash was reduced from LAF by the AC process. Furthermore, HTC was performed on raw corn stover and the HAF of corn stover at 200, 230, and 260 °C for 30 min. To evaluate energy recovery, solid products were characterized in terms of mass yield, ash yield, ultimate analysis, proximate analyses, and higher heating value (HHV). The results showed that the energy density was increased with the increase in HTC temperature, meanwhile the mass yield and ash yield were decreased with the increase in HTC temperature. Proximate analysis showed that fixed carbon increased 18 wt. % for original char and 27 wt. % for HAF char at 260 °C, compared to their respective feedstocks. Finally, the hydrochar resulting from HAF was mixed with LAF and pelletized at 180 bar and 90 °C to densify the energy content. An energy balance of the integrated AC–HTC process was performed, and the results shows that integrated AC with HTC performed at 230 °C resulted in an additional 800 MJ/ton of energy recovery compared to the AC-only scenario.

Suggested Citation

  • Md Tahmid Islam & Nepu Saha & Sergio Hernandez & Jordan Klinger & M. Toufiq Reza, 2021. "Integration of Air Classification and Hydrothermal Carbonization to Enhance Energy Recovery of Corn Stover," Energies, MDPI, vol. 14(5), pages 1-14, March.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:5:p:1397-:d:509971
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    References listed on IDEAS

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    1. Michela Lucian & Luca Fiori, 2017. "Hydrothermal Carbonization of Waste Biomass: Process Design, Modeling, Energy Efficiency and Cost Analysis," Energies, MDPI, vol. 10(2), pages 1-18, February.
    2. Wang, Tengfei & Zhai, Yunbo & Zhu, Yun & Li, Caiting & Zeng, Guangming, 2018. "A review of the hydrothermal carbonization of biomass waste for hydrochar formation: Process conditions, fundamentals, and physicochemical properties," Renewable and Sustainable Energy Reviews, Elsevier, vol. 90(C), pages 223-247.
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    Cited by:

    1. Tiago Teribele & Maria Elizabeth Gemaque Costa & Conceição de Maria Sales da Silva & Lia Martins Pereira & Lucas Pinto Bernar & Douglas Alberto Rocha de Castro & Fernanda Paula da Costa Assunção & Mar, 2023. "Hydrothermal Carbonization of Corn Stover: Structural Evolution of Hydro-Char and Degradation Kinetics," Energies, MDPI, vol. 16(7), pages 1-22, April.
    2. M. Toufiq Reza, 2022. "Hydrothermal Carbonization," Energies, MDPI, vol. 15(15), pages 1-3, July.
    3. Md Tahmid Islam & Al Ibtida Sultana & Cadianne Chambers & Swarna Saha & Nepu Saha & Kawnish Kirtania & M. Toufiq Reza, 2022. "Recent Progress on Emerging Applications of Hydrochar," Energies, MDPI, vol. 15(24), pages 1-45, December.

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