Two-stage air gasification of mixed plastic waste: Olivine as the bed material and effects of various additives and a nickel-plated distributor on the tar removal
Air gasification of mixed plastic waste was conducted in a two-stage gasifier. The effects of the combination of olivine as the fluidized bed material and activated carbon with or without other additives for tar cracking, as well as a Ni-plated distributor, the use of steam as a gasifying agent, and the calcination of olivine on the producer gas compositions and tar production, were also investigated. The maximum H2 concentration (27.3 vol%) was obtained with 900 g of activated carbon in the tar-cracking zone, and through the use of calcined olivine as the bed material. In the experiments, the maximum tar removal efficiency calculated using a base case reached 98.2%. The LHVs of the producer gases were in the range of 6.1–9.0 MJ/Nm3. The increase in the activated carbon amount led to an enhanced H2 production, as well as a decrease in tar production. The Ni-plated distributor was found to be effective for tar removal. In the application of dolomite in the tar-cracking zone and the use of steam as a fluidizing medium resulted in a high rate of HCl removal. The minimum HCl concentration in the producer gases was under 1 ppm.
Year of publication: |
2014
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Authors: | Cho, Min-Hwan ; Mun, Tae-Young ; Choi, Young-Kon ; Kim, Joo-Sik |
Published in: |
Energy. - Elsevier, ISSN 0360-5442. - Vol. 70.2014, C, p. 128-134
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Publisher: |
Elsevier |
Subject: | Mixed plastic waste | Two-stage gasifier | Tar removal | Olivine | Calcined dolomite | Activated carbon |
Saved in:
Online Resource