Air gasification of dried sewage sludge in a two-stage gasifier. Part 3: Application of olivine as a bed material and nickel coated distributor for the production of a clean hydrogen-rich producer gas

Tae Young Mun, Min Hawn Cho, Joo Sik Kim

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23 Scopus citations

Abstract

Air gasification of dried sewage sludge (DSS) was performed with olivine as the bed material and coal-based activated carbon as the tar-cracking additive in a two-stage gasifier to produce a hydrogen-rich producer gas with low tar content. Additionally, to investigate the possible regeneration of coal-based activated carbon, two different activating agents (carbon dioxide and steam) were applied. Finally, to reduce ammonia and tar contents, the performance of a Ni-coated distributor was examined. In the experiments, gasification at a steam to fuel ratio (STF) of 1.11 achieved a tar removal efficiency of 98% and a maximum hydrogen content of 34 vol.%. Furthermore, the activated carbon used for the gasification was less deactivated, compared to those used in the experiments without any reforming agent. When a Ni-coated distributor was applied, the ammonia content in the producer gas was significantly reduced to 11 ppm.

Original languageEnglish
Pages (from-to)5634-5643
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number11
DOIs
StatePublished - 4 Apr 2014

Keywords

  • Activated carbon
  • Ammonia
  • Dried sewage sludge
  • Hydrogen
  • Tar
  • Two-stage gasifier

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