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Batch pyrolysis of pellet made of biomass and crude glycerol: Mass and energy balances

Author

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  • Bartocci, Pietro
  • Bidini, Gianni
  • Asdrubali, Francesco
  • Beatrice, Carlo
  • Frusteri, Francesco
  • Fantozzi, Francesco

Abstract

Glycerol is a side-product of transesterification process, generated during the production of first generation biodiesel. From 10 t of vegetable oil about 10 t of biodiesel are obtained together with 1 ton of glycerol as co-product. Glycerol has an interesting energy content and can be used to provide heat and electricity to the same transesterification plant. Pyrolysis of raw glycerol on a rotary kiln reactor can present some difficulties in feeding it with a fluid product, for this reason, the glycerol was previously pelletized with sawdust to produce a solid fuel. Pellets with two concentrations of glycerol were studied: 20%w and 40%w. The results of the experimental campaign performed in the framework of the project TERVEG, partially funded by the Italian Ministry of Agriculture, Food and Forestry, are described in this paper. The results of pelletizing tests showed that the optimal percentage of glycerol is about 20%w, or lower. In fact, this pellet has good durability and good energetic performances, when pyrolysed. Pyrolysis tests performed at 600 °C showed that pellet with 40% glycerol has a reduced production of the liquid phase and a higher production of the gaseous phase. Nevertheless, the higher heating value of the gas obtained by pellet with 20%w glycerol and pellet with 40% glycerol is similar and it is about 14 MJ/kg.

Suggested Citation

  • Bartocci, Pietro & Bidini, Gianni & Asdrubali, Francesco & Beatrice, Carlo & Frusteri, Francesco & Fantozzi, Francesco, 2018. "Batch pyrolysis of pellet made of biomass and crude glycerol: Mass and energy balances," Renewable Energy, Elsevier, vol. 124(C), pages 172-179.
    • Handle: RePEc:eee:renene:v:124:y:2018:i:c:p:172-179
    DOI: 10.1016/j.renene.2017.06.049
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    References listed on IDEAS

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    1. Fantozzi, F. & Frassoldati, A. & Bartocci, P. & Cinti, G. & Quagliarini, F. & Bidini, G. & Ranzi, E.M., 2016. "An experimental and kinetic modeling study of glycerol pyrolysis," Applied Energy, Elsevier, vol. 184(C), pages 68-76.
    2. Paethanom, A. & Bartocci, P. & D’ Alessandro, B. & D’ Amico, M. & Testarmata, F. & Moriconi, N. & Slopiecka, K. & Yoshikawa, K. & Fantozzi, F., 2013. "A low-cost pyrogas cleaning system for power generation: Scaling up from lab to pilot," Applied Energy, Elsevier, vol. 111(C), pages 1080-1088.
    3. Phuphuakrat, Thana & Namioka, Tomoaki & Yoshikawa, Kunio, 2010. "Tar removal from biomass pyrolysis gas in two-step function of decomposition and adsorption," Applied Energy, Elsevier, vol. 87(7), pages 2203-2211, July.
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    4. Istvan Bacskai & Viktor Madar & Csaba Fogarassy & Laszlo Toth, 2019. "Modeling of Some Operating Parameters Required for the Development of Fixed Bed Small Scale Pyrolysis Plant," Resources, MDPI, vol. 8(2), pages 1-15, April.
    5. Lubwama, Michael & Yiga, Vianney Andrew & Muhairwe, Frank & Kihedu, Joseph, 2020. "Physical and combustion properties of agricultural residue bio-char bio-composite briquettes as sustainable domestic energy sources," Renewable Energy, Elsevier, vol. 148(C), pages 1002-1016.
    6. Magdalena Kachel & Artur Kraszkiewicz & Alaa Subr & Stanisław Parafiniuk & Artur Przywara & Milan Koszel & Grzegorz Zając, 2020. "Impact of the Type of Fertilization and the Addition of Glycerol on the Quality of Spring Rape Straw Pellets," Energies, MDPI, vol. 13(4), pages 1-11, February.
    7. González, William A. & López, Diana & Pérez, Juan F., 2020. "Biofuel quality analysis of fallen leaf pellets: Effect of moisture and glycerol contents as binders," Renewable Energy, Elsevier, vol. 147(P1), pages 1139-1150.
    8. Zhang, Jianan & Wang, Yuesen & Muldoon, Valerie L. & Deng, Sili, 2022. "Crude glycerol and glycerol as fuels and fuel additives in combustion applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 159(C).

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    Keywords

    Pellet; Glycerol; Pyrolysis;
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