Journal of
Engineering and Technology Research

  • Abbreviation: J. Eng. Technol. Res.
  • Language: English
  • ISSN: 2006-9790
  • DOI: 10.5897/JETR
  • Start Year: 2009
  • Published Articles: 178

Full Length Research Paper

Impact of pre-treatment by torrefaction and carbonization on temperature field, energy efficiency and tar content during the gasification of cotton stalks

Harouna Gado Ibrahim
  • Harouna Gado Ibrahim
  • Département de Physique, Facultés des Sciences, Université Dan Dicko Dankoulodo de Maradi, BP: 465 Maradi, Niger.
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Oumar Sanogo
  • Oumar Sanogo
  • Institut de Recherche en Sciences Appliquées et Technologies (IRSAT), 03 BP 7047, Ouagadougou, Burkina Faso.
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Salifou Koucka Ouiminga
  • Salifou Koucka Ouiminga
  • Département de Physique, Université Joseph Ki-Zerbo de Ougadougou, LPCE, 03 BP 7021 Ouagadougou 03, Burkina Faso.
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Tizane Daho
  • Tizane Daho
  • Département de Physique, Université Joseph Ki-Zerbo de Ougadougou, LPCE, 03 BP 7021 Ouagadougou 03, Burkina Faso.
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Jean Koulidiati
  • Jean Koulidiati
  • Département de Physique, Université Joseph Ki-Zerbo de Ougadougou, LPCE, 03 BP 7021 Ouagadougou 03, Burkina Faso.
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  •  Received: 15 January 2018
  •  Accepted: 28 April 2018
  •  Published: 31 May 2018

Abstract

The present study focused on the gasification of raw and pre-treated cotton stalks (CS) by torrefaction and carbonization. Temperature fields, mass balance, energy balance, energy efficiency and tar content of the gas were investigated for the gasification of different types of biomass materials (raw, torrefied and carbonized CS). High temperature and thick reduction zone were obtained during the gasification of pre-treated CS comparatively to the gasification of raw CS. Thus, the thermal and catalytic cracking of the tars may be more pronounced for the gasification of pre-treated biomass particularly for the carbonized biomass. Mass and energy balances have shown a reduction of biomass conversion during the gasification of torrefied and carbonized CS. Indeed, the energy efficiency of 58.7, 46.5 and 38.4% were obtained for raw, carbonized and torrefied CS, respectively. The lowest energetic performances were found during the gasification of torrefied CS due probably to the severe degree of the torrefaction. However, the tar content in gas was drastically decreased by the pre-treatment of the CS. Indeed, the tar contents of 4.41, 2.24 and 0.10 g/Nm3 were obtained for the gasification of raw, torrefied and carbonized CS, respectively.

Key words: Biomass gasification, pre-treatment, tar content, energy efficiency.