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Evaluation of Pyrolysis Reactivity, Kinetics, and Gasification Reactivity of Corn Cobs after Torrefaction Pretreatment

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  • Shengpeng Xia

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Anqing Zheng

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China)

  • Kun Zhao

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China)

  • Zengli Zhao

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China)

  • Haibin Li

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China)

Abstract

To reveal the effect of torrefaction pretreatment on pyrolysis and gasification reactivity of biomass, corn cob was first subjected to torrefaction pretreatment in a fixed-bed reactor at various reaction temperatures. The pyrolysis reactivity, kinetics, and gasification reactivity of torrefied corn cob were systematically assessed by various methods, proving that torrefaction pretreatment has a substantial influence on the physicochemical properties of corn cobs. The O/C and H/C molar ratios of corn cobs considerably drop with the increasing torrefaction temperature, and their higher heat-ing value (HHV) and energy density rise as well. It is found that torrefaction improves the pyrolysis reactivity of corn cobs because hemicellulose degradation is more severe than cellulose degradation during torrefaction, resulting in an increase in the percentage of cellulose in torrefied corn cobs. However, the severe depolymerization, polycondensation, and carbonization reaction during torre-faction of corn cobs at 280–300 °C can lead to a significant decline in the pyrolysis reactivity of corn cobs. Torrefaction pretreatment increases the pyrolysis activation energy of corn cobs, in addition to decreasing the char gasification reactivity of corn cob. The average char gasification reactivity of corn cobs drops when torrefaction severity increases. The passivation of active sites on the char surface may cause condensation and carbonation reactions of corn cobs during torrefaction. These findings provide new sights into the reasonable design of efficient torrefaction methods for appli-cation prior to pyrolysis and gasification of biomass.

Suggested Citation

  • Shengpeng Xia & Anqing Zheng & Kun Zhao & Zengli Zhao & Haibin Li, 2022. "Evaluation of Pyrolysis Reactivity, Kinetics, and Gasification Reactivity of Corn Cobs after Torrefaction Pretreatment," Energies, MDPI, vol. 15(24), pages 1-10, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9277-:d:996304
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    References listed on IDEAS

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    1. Niu, Yanqing & Lv, Yuan & Lei, Yu & Liu, Siqi & Liang, Yang & Wang, Denghui & Hui, Shi'en, 2019. "Biomass torrefaction: properties, applications, challenges, and economy," Renewable and Sustainable Energy Reviews, Elsevier, vol. 115(C).
    2. Zhang, Congyu & Yang, Wu & Chen, Wei-Hsin & Ho, Shih-Hsin & Pétrissans, Anelie & Pétrissans, Mathieu, 2022. "Effect of torrefaction on the structure and reactivity of rice straw as well as life cycle assessment of torrefaction process," Energy, Elsevier, vol. 240(C).
    3. Chen, Wei-Hsin & Hsu, Huan-Chun & Lu, Ke-Miao & Lee, Wen-Jhy & Lin, Ta-Chang, 2011. "Thermal pretreatment of wood (Lauan) block by torrefaction and its influence on the properties of the biomass," Energy, Elsevier, vol. 36(5), pages 3012-3021.
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