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Assessment of olive wastes as energy source: pyrolysis, torrefaction and the key role of H loss in thermal breakdown

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  • Volpe, Roberto
  • Messineo, Antonio
  • Millan, Marcos
  • Volpe, Maurizio
  • Kandiyoti, Rafael

Abstract

The present work describes the first stage of a multi-stage process seeking to develop a usable and cheap design for a downdraft gasifier fed with lingo-cellulosic olive waste. The thermochemical behaviour of two types of olive waste has been assessed during pyrolysis and torrefaction experiments. Olive tree trimmings and olive pulp were pyrolysed in a quartz reactor at peak temperatures between 400 °C and 650 °C, during slow heating experiments (50 °C/min) under a helium blanket. These samples were also torrefied under nitrogen to temperatures between 200 °C and 325 °C. At the peak temperature of 650 °C, mass losses of up to 74% were recorded. Elemental analyses of the chars showed a consistent linear increase of Carbon to values around 75% and a linear decrease of oxygen to values near 10%. By contrast, the H-content remained relatively constant up to about 300 °C and then decreased to as the peak temperature was raised further. The results suggest that the combination of mass loss and H-content may be used as indicators for linear char-GCV increases up to the torrefaction limit of around 300 °C.

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  • Volpe, Roberto & Messineo, Antonio & Millan, Marcos & Volpe, Maurizio & Kandiyoti, Rafael, 2015. "Assessment of olive wastes as energy source: pyrolysis, torrefaction and the key role of H loss in thermal breakdown," Energy, Elsevier, vol. 82(C), pages 119-127.
    • Handle: RePEc:eee:energy:v:82:y:2015:i:c:p:119-127
    DOI: 10.1016/j.energy.2015.01.011
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    6. Leonel J. R. Nunes & Liliana M. E. F. Loureiro & Letícia C. R. Sá & Hugo F. C. Silva, 2020. "Waste Recovery through Thermochemical Conversion Technologies: A Case Study with Several Portuguese Agroforestry By-Products," Clean Technol., MDPI, vol. 2(3), pages 1-15, September.
    7. Christoforou, Elias A. & Fokaides, Paris A., 2016. "Life cycle assessment (LCA) of olive husk torrefaction," Renewable Energy, Elsevier, vol. 90(C), pages 257-266.
    8. Leonel J. R. Nunes, 2020. "Torrefied Biomass as an Alternative in Coal-Fueled Power Plants: A Case Study on Grindability of Agroforestry Waste Forms," Clean Technol., MDPI, vol. 2(3), pages 1-20, July.
    9. Vincenzo Franzitta & Domenico Curto & Daniele Milone & Davide Rao, 2016. "Assessment of Renewable Sources for the Energy Consumption in Malta in the Mediterranean Sea," Energies, MDPI, vol. 9(12), pages 1-17, December.
    10. Sansaniwal, S.K. & Pal, K. & Rosen, M.A. & Tyagi, S.K., 2017. "Recent advances in the development of biomass gasification technology: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 72(C), pages 363-384.
    11. Barskov, Stan & Zappi, Mark & Buchireddy, Prashanth & Dufreche, Stephen & Guillory, John & Gang, Daniel & Hernandez, Rafael & Bajpai, Rakesh & Baudier, Jeff & Cooper, Robbyn & Sharp, Richard, 2019. "Torrefaction of biomass: A review of production methods for biocoal from cultured and waste lignocellulosic feedstocks," Renewable Energy, Elsevier, vol. 142(C), pages 624-642.
    12. 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.
    13. Vincenzo Franzitta & Domenico Curto & Daniele Milone & Alessia Viola, 2016. "The Desalination Process Driven by Wave Energy: A Challenge for the Future," Energies, MDPI, vol. 9(12), pages 1-16, December.
    14. 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).
    15. Xin, Shanzhi & Mi, Tie & Liu, Xiaoye & Huang, Fang, 2018. "Effect of torrefaction on the pyrolysis characteristics of high moisture herbaceous residues," Energy, Elsevier, vol. 152(C), pages 586-593.
    16. Roberto Volpe & Simona Messineo & Maurizio Volpe & Antonio Messineo, 2015. "Carbon Footprint of Tree Nuts Based Consumer Products," Sustainability, MDPI, vol. 7(11), pages 1-18, November.

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