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Pyrolysis and gasification of food waste: Syngas characteristics and char gasification kinetics

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  • Ahmed, I.I.
  • Gupta, A.K.

Abstract

Characteristics of syngas from the pyrolysis and gasification of food waste has been investigated. Characteristic differences in syngas properties and overall yields from pyrolysis and gasification were determined at two distinct high temperatures of 800 and 900 °C. Pyrolysis and gasification behavior were evaluated in terms of syngas flow rate, hydrogen flow rate, output power, total syngas yield, total hydrogen yield, total energy yield, and apparent thermal efficiency. Gasification was more beneficial than pyrolysis based on investigated criteria, but longer time was needed to finish the gasification process. Longer time of gasification is attributed to slow reactions between the residual char and gasifying agent. Consequently, the char gasification kinetics was investigated. Inorganic constituents of food char were found to have a catalytic effect. Char reactivity increased with increased degree of conversion. In the conversion range from 0.1 to 0.9 the increase in reactivity was accompanied by an increase in pre-exponential factor, which suggested an increase in gasifying agent adsorption rate to char surface. However, in the conversion range from 0.93 to 0.98 the increase in reactivity was accompanied by a decrease in activation energy. A compensation effect was observed in this range of conversion of 0.93-0.98.

Suggested Citation

  • Ahmed, I.I. & Gupta, A.K., 2010. "Pyrolysis and gasification of food waste: Syngas characteristics and char gasification kinetics," Applied Energy, Elsevier, vol. 87(1), pages 101-108, January.
    • Handle: RePEc:eee:appene:v:87:y:2010:i:1:p:101-108
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    References listed on IDEAS

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    1. Ahmed, I. & Gupta, A.K., 2009. "Syngas yield during pyrolysis and steam gasification of paper," Applied Energy, Elsevier, vol. 86(9), pages 1813-1821, September.
    2. Meher, L.C. & Vidya Sagar, D. & Naik, S.N., 2006. "Technical aspects of biodiesel production by transesterification--a review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 10(3), pages 248-268, June.
    3. Ahmed, I. & Gupta, A.K., 2009. "Evolution of syngas from cardboard gasification," Applied Energy, Elsevier, vol. 86(9), pages 1732-1740, September.
    4. Ahmed, I. & Gupta, A.K., 2009. "Characteristics of cardboard and paper gasification with CO2," Applied Energy, Elsevier, vol. 86(12), pages 2626-2634, December.
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