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Effects of moisture content, torrefaction temperature, and die temperature in pilot scale pelletizing of torrefied Norway spruce

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  • Larsson, Sylvia H.
  • Rudolfsson, Magnus
  • Nordwaeger, Martin
  • Olofsson, Ingemar
  • Samuelsson, Robert

Abstract

Pilot scale pelletizing of torrefied Norway spruce was performed in a factorial design with controlled factors at two levels: material moisture content (11% and 15%) and torrefaction temperature (270 and 300°C), and die temperature as an uncontrolled factor (60–105°C). Compared to commercial wood pellets, produced pellets had comparable bulk densities (630–710kg/m3) but lower pellet durability (80–90%). Energy consumption for pelletizing of torrefied materials was approximately 100% higher than for softwood pelletizing, despite using a much shorter die channel length (35 vs. 55mm:s), and the amounts of fines were high (10–30%). Die temperature showed a strong positive correlation with pellet production rate. Material moisture content had little influence on pellet quality and production rate, but addition of water created handling problems due to bad flow behavior.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:102:y:2013:i:c:p:827-832
    DOI: 10.1016/j.apenergy.2012.08.046
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    1. Larsson, Sylvia H. & Rudolfsson, Magnus, 2012. "Temperature control in energy grass pellet production – Effects on process stability and pellet quality," Applied Energy, Elsevier, vol. 97(C), pages 24-29.
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