A study on pyrolytic gasification of coffee grounds and implications to allothermal gasification

Ondřej Mašek, Miki Konno, Sou Hosokai, Nozomu Sonoyama, Koyo Norinaga, Jun ichiro Hayashi

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


The increasing interest in biomass, as a renewable source of energy, is stimulating a search for suitable biomass resources as well as the development of technologies for their effective utilization. This work concentrated on characteristics of processes occurring during pyrolytic gasification of upgraded food industry residues, namely residue from industrial production of liquid coffee, and assessed its suitability for conversion in an allothermal gasifier. The influence of several operating parameters on product composition was examined with three different laboratory-scale reactors, studying the primary pyrolysis and secondary pyrolysis of nascent volatiles, and the steam gasification of char. The experimental results show that a high degree of conversion of UCG into volatiles and gases (up to 88% C-basis) can be achieved by fast pyrolysis even at temperatures as low as 1073 K. In addition, the degree of conversion is not influenced by the presence or concentration of steam, which is an important factor in allothermal gasification. Mathematical simulation of an allothermal gasifier showed that net cold-gas efficiency as high as 86% can be reached.

Original languageEnglish
Pages (from-to)78-89
Number of pages12
JournalBiomass and Bioenergy
Issue number1
Publication statusPublished - Jan 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Forestry
  • Renewable Energy, Sustainability and the Environment
  • Agronomy and Crop Science
  • Waste Management and Disposal


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