Air gasification of mixed plastic wastes using calcined dolomite and activated carbon in a two-stage gasifier to reduce tar

Min Hwan Cho, Tae Young Mun, Joo Sik Kim

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

In this experiment, air gasification was conducted with a fraction of mixed plastic wastes using a two-stage gasifier. Calcined dolomite as a bed material and activated carbon as a tar-cracking additive were simultaneously used for the production of a producer gas containing low tar and high hydrogen. The effects of the bed material, equivalence ratio (ER), amount of activated carbon, and temperatures in two reaction zones (the upper- and lower-reactor) on the composition of producer gas and amount of tar generated were investigated. When the amount of activated carbon increased from 0 to 900 g using calcined dolomite as the bed material, the concentrations of H2 and CO in the producer gas increased sharply from 14.9 to 26.1 vol% and from 9.4 to 16.8 vol%, respectively. When 900 g of activated carbon was applied, the total tar amount was about 96% less than that obtained with only silica sand as the bed material. The maximum Lower Heating Value (LHV) of the producer gas was about 13.4 MJ/Nm3.

Original languageEnglish
Pages (from-to)299-305
Number of pages7
JournalEnergy
Volume53
DOIs
StatePublished - 1 May 2013

Keywords

  • Activated carbon
  • Calcined dolomite
  • Mixed plastic wastes
  • Tar removal
  • Two-stage gasifier

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