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Moisture content and storage time influence the binding mechanisms in biofuel wood pellets

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  • Samuelsson, Robert
  • Larsson, Sylvia H.
  • Thyrel, Mikael
  • Lestander, Torbjörn A.

Abstract

In a pelletizing experiment the three factors sawdust moisture content, steam conditioning of the sawdust, and storage time of the raw material, were varied in a full factorial design with a total of 34 experiments to evaluate the influences on the pelletizing process and the pellet quality when producing biofuel wood pellets from pine sawdust. Moisture content of the sawdust was found to be the dominant factor for the bulk density and for the pelletizer motor current, both showing low values at high moisture contents due to the lubricating property of water that lowers the friction in the pelletizing process. More complex models were obtained for mechanical durability and the amount of fines, where all factors and most interactions and squared terms were significant. In order to explain the effect of the sawdust moisture content and the storage time on these response factors, a qualitative model for the binding mechanism is suggested. In this model water is supposed to be actively involved in the binding mechanism as hydrogen bonded bridges. The increase in binding strength with storage time is explained by the reduction of extractive content which contain molecules that can block binding sites on the material surface. Optimum pellet quality was obtained when the storage time exceeded 120days and within a range of sawdust moisture content of 11–13%.

Suggested Citation

  • Samuelsson, Robert & Larsson, Sylvia H. & Thyrel, Mikael & Lestander, Torbjörn A., 2012. "Moisture content and storage time influence the binding mechanisms in biofuel wood pellets," Applied Energy, Elsevier, vol. 99(C), pages 109-115.
    • Handle: RePEc:eee:appene:v:99:y:2012:i:c:p:109-115
    DOI: 10.1016/j.apenergy.2012.05.004
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    1. Aldo Dal Prà & Francesca Ugolini & Martino Negri & Sara Bortolu & Pierpaolo Duce & Cristina Macci & Andrea Lombardo & Martina Benedetti & Giovanni Brajon & Lucia Guazzini & Stefano Casini & Sara Spagn, 2024. "Wool Agro-Waste Biomass and Spruce Sawdust: Pellets as an Organic Soil Amendment," Sustainability, MDPI, vol. 16(6), pages 1-14, March.
    2. Chen, Yuntian & Jiang, Su & Zhang, Dongxiao & Liu, Chaoyang, 2017. "An adsorbed gas estimation model for shale gas reservoirs via statistical learning," Applied Energy, Elsevier, vol. 197(C), pages 327-341.
    3. Larsson, Sylvia H. & Rudolfsson, Magnus & Nordwaeger, Martin & Olofsson, Ingemar & Samuelsson, Robert, 2013. "Effects of moisture content, torrefaction temperature, and die temperature in pilot scale pelletizing of torrefied Norway spruce," Applied Energy, Elsevier, vol. 102(C), pages 827-832.
    4. Bajwa, Dilpreet S. & Peterson, Tyler & Sharma, Neeta & Shojaeiarani, Jamileh & Bajwa, Sreekala G., 2018. "A review of densified solid biomass for energy production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 96(C), pages 296-305.
    5. Rudolfsson, Magnus & Larsson, Sylvia H. & Lestander, Torbjörn A., 2017. "New tool for improved control of sub-process interactions in rotating ring die pelletizing of torrefied biomass," Applied Energy, Elsevier, vol. 190(C), pages 835-840.
    6. Yılmaz, Hasan & Çanakcı, Murad & Topakcı, Mehmet & Karayel, Davut & Yiğit, Mete & Ortaçeşme, Derya, 2023. "In-situ pelletization of campus biomass residues: Case study for Akdeniz University," Renewable Energy, Elsevier, vol. 212(C), pages 972-983.
    7. Sunyong Park & Hui-Rim Jeong & Yun-A Shin & Seok-Jun Kim & Young-Min Ju & Kwang-Cheol Oh & La-Hoon Cho & DaeHyun Kim, 2021. "Performance Optimisation of Fuel Pellets Comprising Pepper Stem and Coffee Grounds through Mixing Ratios and Torrefaction," Energies, MDPI, vol. 14(15), pages 1-16, August.
    8. Okey Francis Obi & Ralf Pecenka & Michael J. Clifford, 2022. "A Review of Biomass Briquette Binders and Quality Parameters," Energies, MDPI, vol. 15(7), pages 1-22, March.
    9. Whittaker, Carly & Shield, Ian, 2017. "Factors affecting wood, energy grass and straw pellet durability – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 71(C), pages 1-11.
    10. Stolarski, Mariusz J. & Stachowicz, Paweł & Dudziec, Paweł, 2022. "Wood pellet quality depending on dendromass species," Renewable Energy, Elsevier, vol. 199(C), pages 498-508.
    11. Safa Arous & Ahmed Koubaa & Hassine Bouafif & Besma Bouslimi & Flavia Lega Braghiroli & Chedly Bradai, 2021. "Effect of Pyrolysis Temperature and Wood Species on the Properties of Biochar Pellets," Energies, MDPI, vol. 14(20), pages 1-15, October.
    12. Zhou Yu & Jie Zhao & Yinfeng Hua & Xiaoying Li & Qincheng Chen & Guoqing Shen, 2021. "Optimization of Granulation Process for Binder-Free Biochar-Based Fertilizer from Digestate and Its Slow-Release Performance," Sustainability, MDPI, vol. 13(15), pages 1-18, July.
    13. Mostafa, Mohamed E. & Hu, Song & Wang, Yi & Su, Sheng & Hu, Xun & Elsayed, Saad A. & Xiang, Jun, 2019. "The significance of pelletization operating conditions: An analysis of physical and mechanical characteristics as well as energy consumption of biomass pellets," Renewable and Sustainable Energy Reviews, Elsevier, vol. 105(C), pages 332-348.
    14. Zvicevičius, Egidijus & Raila, Algirdas & Čiplienė, Aušra & Černiauskienė, Živilė & Kadžiulienė, Žydrė & Tilvikienė, Vita, 2018. "Effects of moisture and pressure on densification process of raw material from Artemisia dubia Wall," Renewable Energy, Elsevier, vol. 119(C), pages 185-192.
    15. Maaz Hassan & Naveed Usman & Majid Hussain & Adnan Yousaf & Muhammad Aamad Khattak & Sidra Yousaf & Rankeshwarnath Sanjay Mishr & Sana Ahmad & Fariha Rehman & Ahmad Rashedi, 2023. "Environmental and Socio-Economic Assessment of Biomass Pellets Biofuel in Hazara Division, Pakistan," Sustainability, MDPI, vol. 15(15), pages 1-23, August.
    16. Jakub Styks & Marek Wróbel & Jarosław Frączek & Adrian Knapczyk, 2020. "Effect of Compaction Pressure and Moisture Content on Quality Parameters of Perennial Biomass Pellets," Energies, MDPI, vol. 13(8), pages 1-20, April.
    17. Dudziec, Paweł & Stachowicz, Paweł & Stolarski, Mariusz J., 2023. "Diversity of properties of sawmill residues used as feedstock for energy generation," Renewable Energy, Elsevier, vol. 202(C), pages 822-833.
    18. 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.

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