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Physico-mechanical and energy properties of pellets made from ground walnut shells, coniferous tree cones and their mixtures

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  • Gendek, Arkadiusz
  • Aniszewska, Monika
  • Owoc, Danuta
  • Tamelová, Barbora
  • Malaťák, Jan
  • Velebil, Jan
  • Krilek, Jozef

Abstract

The aim of this study was to verify the possibility of obtaining good-quality pellets from mixtures of materials with different particle structures and shapes. The paper describes the pressure agglomeration of ground walnut shells and coniferous tree cones as well as their three mixtures. The process involved the production of pellets with a diameter of 6 and 8 mm at the temperatures of 95 and 120°C by applying the force of 5 and 6 kN. The fraction distribution of the particles from which the pellets were made was assessed. It was found that the pellets made only of cones, as opposed to those made only of nutshells, have a fairly even distribution, i.e. the particles were of similar size. The size parameters of the pellets (length and diameter) were measured, on the basis of which the density of individual pellets was calculated. Compressive stresses of the pellets were tested on an endurance testing machine. It was found that the pellets with a greater share of nut shells were less durable than those made with the addition of ground cones. The pellets with a diameter of 6 mm and formed at a temperature of 120°C also showed a higher strength than those with a diameter of 8 mm and compacted at a temperature of 95°C. Increasing the force did not statistically significantly improve the compressive strength of the pellets. Tests of the elemental composition and the amount of ash allowed for concluding that pellets are a good energy material, as evidenced by their average calorific value of about 19 MJ kg−1. Due to exceeding the permissible limit of nitrogen content (ISO 17225), the pellets made solely of cones were classified as quality class B, while the addition of ground walnut shells shifted them to class A2.

Suggested Citation

  • Gendek, Arkadiusz & Aniszewska, Monika & Owoc, Danuta & Tamelová, Barbora & Malaťák, Jan & Velebil, Jan & Krilek, Jozef, 2023. "Physico-mechanical and energy properties of pellets made from ground walnut shells, coniferous tree cones and their mixtures," Renewable Energy, Elsevier, vol. 211(C), pages 248-258.
    • Handle: RePEc:eee:renene:v:211:y:2023:i:c:p:248-258
    DOI: 10.1016/j.renene.2023.04.122
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    References listed on IDEAS

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    1. Lisowski, Aleksander & Pajor, Małgorzata & Świętochowski, Adam & Dąbrowska, Magdalena & Klonowski, Jacek & Mieszkalski, Leszek & Ekielski, Adam & Stasiak, Mateusz & Piątek, Michał, 2019. "Effects of moisture content, temperature, and die thickness on the compaction process, and the density and strength of walnut shell pellets," Renewable Energy, Elsevier, vol. 141(C), pages 770-781.
    2. Nives Jovičić & Alan Antonović & Ana Matin & Suzana Antolović & Sanja Kalambura & Tajana Krička, 2022. "Biomass Valorization of Walnut Shell for Liquefaction Efficiency," Energies, MDPI, vol. 15(2), pages 1-13, January.
    3. Biswas, Amit Kumar & Rudolfsson, Magnus & Broström, Markus & Umeki, Kentaro, 2014. "Effect of pelletizing conditions on combustion behaviour of single wood pellet," Applied Energy, Elsevier, vol. 119(C), pages 79-84.
    4. Cimen Demirel & Gürkan Alp Kağan Gürdil & Abraham Kabutey & David Herak, 2020. "Effects of Forces, Particle Sizes, and Moisture Contents on Mechanical Behaviour of Densified Briquettes from Ground Sunflower Stalks and Hazelnut Husks," Energies, MDPI, vol. 13(10), pages 1-19, May.
    5. Jiří Souček & Algirdas Jasinskas, 2020. "Assessment of the Use of Potatoes as a Binder in Flax Heating Pellets," Sustainability, MDPI, vol. 12(24), pages 1-14, December.
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