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Residual pyrolysis biochar as additive to enhance wood pellets quality

Author

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  • García, R.
  • Gil, M.V.
  • Fanjul, A.
  • González, A.
  • Majada, J.
  • Rubiera, F.
  • Pevida, C.

Abstract

Woody biomass pellets' demand for primary energy production is increasing. To guarantee sustainable and cost-efficient pellet production the diversification of biomass feedstock is mandatory. In this work it is proposed to re-use the solid biochar obtained from pyrolysis of eucalyptus (PEc) at 700 °C as an additive to produce enhanced pine sawdust (PIN) pellets. The process required the addition of glycerol as a lubricant in a percentage of 1 and 2 wt% per 5 and 10 wt% of pyrolyzed eucalyptus in the blend, respectively. Small additions of PEc enhanced PIN pellets’ grindability and water-resistance, providing products with remarkable values of durability (up to 99%), net calorific value (up to 20 MJ/kg), energy density (up to 13.3 GJ/m3), and particle density (up to 1.24 g/cm3). N, S, chlorine, and heavy metals contents were also analyzed. The proposed pellets fulfill the A1/A2 and the I1/I2 quality classes for domestic and industrial wood pellets, respectively. A preliminary economic evaluation indicated that pellets made up from a mixture of 90% PIN and 10% PEc are competitive compared to raw PIN pellets, with expected savings in the costs of production, energy, transport, and construction of a storage site of 4, 13, 10 and 7%, respectively.

Suggested Citation

  • García, R. & Gil, M.V. & Fanjul, A. & González, A. & Majada, J. & Rubiera, F. & Pevida, C., 2021. "Residual pyrolysis biochar as additive to enhance wood pellets quality," Renewable Energy, Elsevier, vol. 180(C), pages 850-859.
    • Handle: RePEc:eee:renene:v:180:y:2021:i:c:p:850-859
    DOI: 10.1016/j.renene.2021.08.113
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    References listed on IDEAS

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    2. Émilie Robert & Flavia Lega Braghiroli, 2022. "Development of a Biochar-Based Substrate Added with Nitrogen from a Mining Effluent for the Production of Picea mariana Seedlings," Clean Technol., MDPI, vol. 4(3), pages 1-15, August.
    3. Lasek, Janusz A. & Matuszek, Katarzyna & Hrycko, Piotr & Głód, Krzysztof & Li, Yueh-Heng, 2023. "The combustion of torrefied biomass in commercial-scale domestic boilers," Renewable Energy, Elsevier, vol. 216(C).
    4. Wentao Li & Mingfeng Wang & Fanbin Meng & Yifei Zhang & Bo Zhang, 2022. "A Review on the Effects of Pretreatment and Process Parameters on Properties of Pellets," Energies, MDPI, vol. 15(19), pages 1-23, October.
    5. Carvalho, Pollyana R. & Medeiros, Samuel L.S. & Paixão, Raul L. & Figueredo, Igor M. & Mattos, Adriano L.A. & Rios, M. Alexsandra S., 2023. "Thermogravimetric pyrolysis of residual biomasses obtained post-extraction of carnauba wax: Determination of kinetic parameters using Friedman's isoconversional method," Renewable Energy, Elsevier, vol. 207(C), pages 703-713.

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