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.

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

VOLPE, ROBERTO;MESSINEO, ANTONIO;Volpe, Maurizio;
2015

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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11387/109199
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 63
  • ???jsp.display-item.citation.isi??? ND
social impact