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Torrefied, spherical biomass pellets through the use of experimental design

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  • Duncan, Andrew
  • Pollard, Andrew
  • Fellouah, Hachimi

Abstract

Non-torrefied biomass pellets produced using extrusion methods are mechanically weak and therefore produce fines/dust during handling and transportation, readily absorb moisture, remain biologically active, have low specific energy content together with poor flow and handling characteristics. A new spherical, torrefied biomass pellet is introduced that uses a compression method. The resulting pellet addresses the above noted shortcomings of extruded pellets. Designs of Experiments were constructed to examine the responses of these new pellets. Tests of tensile strength, ultimate and proximate analysis, abrasion resistance, moisture sensitivity, and mass and dimensional characteristics are considered. Pellets were found to have tensile strengths between 855 and 2161N, absorbed between 11.0 and 29.4mass% water, but returned to near ambient conditions in less than 24h, and had a range of gross calorific values between 17.5 and 21.1MJ/kg and had 100% abrasion resistance. The Designs of Experiments were able to produce models with a 95% confidence level for torrefaction, tensile strength, gross calorific value, pellet size, density, and moisture absorption and evaporation. Torrefaction temperature was found to be a dominant influence on the outcome of most pellet characteristics, yet the process is non-optimised in this work and in general is not well understood.

Suggested Citation

  • Duncan, Andrew & Pollard, Andrew & Fellouah, Hachimi, 2013. "Torrefied, spherical biomass pellets through the use of experimental design," Applied Energy, Elsevier, vol. 101(C), pages 237-243.
    • Handle: RePEc:eee:appene:v:101:y:2013:i:c:p:237-243
    DOI: 10.1016/j.apenergy.2012.03.035
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    References listed on IDEAS

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    1. Chen, Wei-Hsin & Cheng, Wen-Yi & Lu, Ke-Miao & Huang, Ying-Pin, 2011. "An evaluation on improvement of pulverized biomass property for solid fuel through torrefaction," Applied Energy, Elsevier, vol. 88(11), pages 3636-3644.
    2. Uslu, Ayla & Faaij, André P.C. & Bergman, P.C.A., 2008. "Pre-treatment technologies, and their effect on international bioenergy supply chain logistics. Techno-economic evaluation of torrefaction, fast pyrolysis and pelletisation," Energy, Elsevier, vol. 33(8), pages 1206-1223.
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    2. Chen, Wei-Hsin & Chen, Chih-Jung & Hung, Chen-I & Shen, Cheng-Hsien & Hsu, Heng-Wen, 2013. "A comparison of gasification phenomena among raw biomass, torrefied biomass and coal in an entrained-flow reactor," Applied Energy, Elsevier, vol. 112(C), pages 421-430.
    3. Nunes, L.J.R. & Matias, J.C.O. & Catalão, J.P.S., 2014. "Mixed biomass pellets for thermal energy production: A review of combustion models," Applied Energy, Elsevier, vol. 127(C), pages 135-140.
    4. Muhammet Enes Önür & Kamil Ekinci & Mihriban Civan & Mehmet Emin Bilgili & Sema Yurdakul, 2023. "Quality Properties and Torrefaction Characteristics of Pellets: Rose Oil Distillation Solid Waste and Red Pine Sawdust," Sustainability, MDPI, vol. 15(14), pages 1-16, July.
    5. Rudolfsson, Magnus & Borén, Eleonora & Pommer, Linda & Nordin, Anders & Lestander, Torbjörn A., 2017. "Combined effects of torrefaction and pelletization parameters on the quality of pellets produced from torrefied biomass," Applied Energy, Elsevier, vol. 191(C), pages 414-424.

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