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Effects of slow-pyrolysis conditions on the products yields and properties and on exergy efficiency: A comprehensive assessment for wheat straw

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  • Greco, Gianluca
  • Di Stasi, Christian
  • Rego, Filipe
  • González, Belén
  • Manyà, Joan J.

Abstract

In the present work, the effects of the peak temperature (400–550 °C), absolute pressure (0.2–0.9 MPa), gas residence time (100–200 s) and reactor atmosphere (pure N2 or a mixture of CO2/N2) on the pyrolysis behavior of wheat straw pellets were investigated. A factorial design of experiments was adopted to assess the effects of the above-mentioned factors on the pyrolysis products, the exergy efficiencies related to them and to the overall process, and the heat required. The pyrolysis energy/exergy assessment is nowadays of great interest, for the scaling of the installations from lab-scale to commercial-scale. Results showed that, as expected, the peak temperature was the most influential factor on the yields and distributions of all the pyrolysis products as well as the char properties related to its potential stability and pore size distribution. However, an increased pressure enhanced the release of the gas species at the expense of the liquid products, without altering the final char yield. The char exergy efficiency was negatively affected by an increase in peak temperature, whereas its effect on the exergy efficiency of the produced gas resulted to be positive. It was also found that pressurized pyrolysis favored the exergy efficiency of the process, even at relatively high pyrolysis peak temperature. For the biomass feedstock and the range of operating conditions studied here, thermodynamic irreversibilities of the pyrolysis system were considerably lowered when the process was conducted at 550 °C, 0.9 MPa and using a mixture of CO2 and N2 as carrier gas at relatively short residence times.

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  • Greco, Gianluca & Di Stasi, Christian & Rego, Filipe & González, Belén & Manyà, Joan J., 2020. "Effects of slow-pyrolysis conditions on the products yields and properties and on exergy efficiency: A comprehensive assessment for wheat straw," Applied Energy, Elsevier, vol. 279(C).
  • Handle: RePEc:eee:appene:v:279:y:2020:i:c:s0306261920313192
    DOI: 10.1016/j.apenergy.2020.115842
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    References listed on IDEAS

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    1. Greco, Gianluca & Canevesi, Rafael L.S. & Di Stasi, Christian & Celzard, Alain & Fierro, Vanessa & Manyà, Joan J., 2022. "Biomass-derived carbons physically activated in one or two steps for CH4/CO2 separation," Renewable Energy, Elsevier, vol. 191(C), pages 122-133.
    2. Hasan, M.M. & Rasul, M.G. & Ashwath, N. & Khan, M.M.K. & Jahirul, M.I., 2022. "Fast pyrolysis of Beauty Leaf Fruit Husk (BLFH) in an auger reactor: Effect of temperature on the yield and physicochemical properties of BLFH oil," Renewable Energy, Elsevier, vol. 194(C), pages 1098-1109.
    3. María Videgain & Joan J. Manyà & Mariano Vidal & Eva Cristina Correa & Belén Diezma & Francisco Javier García-Ramos, 2021. "Influence of Feedstock and Final Pyrolysis Temperature on Breaking Strength and Dust Production of Wood-Derived Biochars," Sustainability, MDPI, vol. 13(21), pages 1-15, October.
    4. Christian Di Stasi & Simona Renda & Gianluca Greco & Belén González & Vincenzo Palma & Joan J. Manyà, 2021. "Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO 2 Catalysts for CO 2 Methanation," Sustainability, MDPI, vol. 13(16), pages 1-13, August.
    5. Baghel, Paramjeet & Sakhiya, Anil Kumar & Kaushal, Priyanka, 2022. "Influence of temperature on slow pyrolysis of Prosopis Juliflora: An experimental and thermodynamic approach," Renewable Energy, Elsevier, vol. 185(C), pages 538-551.
    6. Anand, Abhijeet & Kumar, Vivek & Kaushal, Priyanka, 2022. "Biochar and its twin benefits: Crop residue management and climate change mitigation in India," Renewable and Sustainable Energy Reviews, Elsevier, vol. 156(C).

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