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Conversion of Waste Corn Straw to Value-Added Fuel via Hydrothermal Carbonization after Acid Washing

Author

Listed:
  • Shulun Han

    (School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China)

  • Li Bai

    (Key Laboratory of Songliao Aquatic Environment Ministry of Education, Jilin Jianzhu University, Changchun 130118, China)

  • Mingshu Chi

    (School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China)

  • Xiuling Xu

    (Library of Jilin Jianzhu University, Jilin Jianzhu University, Changchun 130118, China)

  • Zhao Chen

    (School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China)

  • Kecheng Yu

    (School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China)

Abstract

To enhance the hydrothermal carbonization (HTC) process on biomass waste and improve the quality of biomass solid fuel. Corn straw was pretreated with acid washing and subsequently hydrothermally carbonized at 180–270 °C. The solid product obtained (hydrochars) was compared with the solid product produced from untreated hydrothermally carbonized straw. The results show that the acid pretreatment removed 7.9% of the ash from the straw. ICP and XRD analysis show that most of the alkali and alkaline earth metals have been removed. This addresses the defect of high ash content as the HTC temperature increases. The HHV of hydrochars produced by HTC after acid washing can reach 27.7 MJ/kg, which is nearly 10% higher than that of hydrochars prepared without acid washing pretreatment, and nearly 70% higher than that of straw raw materials. Elemental analysis and FTIR analysis show that the acid washing pretreatment changed the content and structure of the biomass components in the straw, resulting in a more complete HTC reaction and higher carbon sequestration. The decrease of H/C and O/C deepened the degree of coal-like transformation of hydrochars, with the lowest approaching the bituminous coal zone. The combustion characteristics of the hydrochars prepared after acid washing were significantly upgraded, the comprehensive combustion index and thermal stability of hydrochars both increased. Therefore, HTC after acid washing pretreatment is beneficial to further improve the high heating value and combustion characteristics of hydrochar.

Suggested Citation

  • Shulun Han & Li Bai & Mingshu Chi & Xiuling Xu & Zhao Chen & Kecheng Yu, 2022. "Conversion of Waste Corn Straw to Value-Added Fuel via Hydrothermal Carbonization after Acid Washing," Energies, MDPI, vol. 15(5), pages 1-14, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1828-:d:762137
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    References listed on IDEAS

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    2. Małgorzata Sieradzka & Agata Mlonka-Mędrala & Izabela Kalemba-Rec & Markus Reinmöller & Felix Küster & Wojciech Kalawa & Aneta Magdziarz, 2022. "Evaluation of Physical and Chemical Properties of Residue from Gasification of Biomass Wastes," Energies, MDPI, vol. 15(10), pages 1-19, May.
    3. Gregor Sailer & Julian Comi & Florian Empl & Martin Silberhorn & Valeska Heymann & Monika Bosilj & Siham Ouardi & Stefan Pelz & Joachim Müller, 2022. "Hydrothermal Treatment of Residual Forest Wood (Softwood) and Digestate from Anaerobic Digestion—Influence of Temperature and Holding Time on the Characteristics of the Solid and Liquid Products," Energies, MDPI, vol. 15(10), pages 1-26, May.

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