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Stratified downdraft gasification of wood chips with a significant bark content

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  • Zachl, A.
  • Soria-Verdugo, A.
  • Buchmayr, M.
  • Gruber, J.
  • Anca-Couce, A.
  • Scharler, R.
  • Hochenauer, C.

Abstract

The strict fuel quality limitations are amongst the main barriers preventing the success of small-scale downdraft gasification. In a first step towards alternative fuels, the application of wood chips with bark content must be investigated. Therefore, this paper presents the results of thermogravimetric analyses (TGA) and the gasification of wood chips with a significant larch bark content (up to 50%) in a stratified downdraft gasifier. The TGA revealed, that bark generated twice as much char as wood during pyrolysis. The gasification zones in the downdraft reactor did not shift when the fuel was switched, which allows its utilization in the same setup as pure wood chips. The concentrations of CO, H2 and CO2 were also almost unaffected at approximately 21.5 vol%, 14.6 vol% and 9.1 vol%, respectively. The highest gasification efficiency was achieved with 20% fuel bark content. The most significant effect was the reduction of the non-methane hydrocarbon content by up to 80% when bark was in the fuel, due to reduced tar generation and enhanced cracking. Therefore, the addition of bark up to a certain level even improved the gas quality and performance. These novel results predict a bright future for forestry residues in downdraft gasification.

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  • Zachl, A. & Soria-Verdugo, A. & Buchmayr, M. & Gruber, J. & Anca-Couce, A. & Scharler, R. & Hochenauer, C., 2022. "Stratified downdraft gasification of wood chips with a significant bark content," Energy, Elsevier, vol. 261(PB).
    • Handle: RePEc:eee:energy:v:261:y:2022:i:pb:s0360544222022071
    DOI: 10.1016/j.energy.2022.125323
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    1. Zachl, Angelika & Buchmayr, Markus & Gruber, Johann & Anca-Couce, Andrés & Scharler, Robert & Hochenauer, Christoph, 2024. "Experimental-data-based, easy-to-use product gas composition prediction of a commercial open-top gasifier based on commercially used properties of softwood chips," Renewable Energy, Elsevier, vol. 226(C).
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