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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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    11. 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.
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    13. 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.
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