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Lab and Bench-Scale Pelletization of Torrefied Wood Chips—Process Optimization and Pellet Quality

机译：实验室和实验室规模的碎木片制粒—工艺优化和制粒质量

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摘要

Combined torrefaction and pelletization is used to increase the fuel value of biomass by increasing its energy density and improving its handling and combustion properties. In the present study, a single-pellet press tool was used to screen for the effects of pellet die temperature, moisture content, additive addition, and the degree of torrefaction on the pelletizing properties and pellet quality, i.e., density, static friction, and pellet strength. Results were compared with pellet production using a bench-scale pelletizer. The results indicate that friction is the key factor when scaling up from single-pellet press to bench-scale pelletizer. Tuning moisture content or increasing the die temperature did not ease the pellet production of torrefied wood chips significantly. The addition of rapeseed oil as a lubricant reduced the static friction by half and stabilized pellet production; however, the pellet quality, strength, and density were negatively affected. The pellets produced from pine wood torrefied at 250 and 280 °C were shorter than pellets produced from untreated wood and their quality did not match conventional wood pellet standards. However, the heating value of the torrefied pellets was higher and the particle size distribution after grinding the pellets was more uniform compared to conventional wood pellets.
机译：结合使用烘焙和造粒可通过增加其能量密度并改善其处理和燃烧特性来提高生物质的燃料价值。在本研究中，使用单丸压机筛选丸粒模头温度，水分含量，添加剂添加以及焙干程度对丸粒化性质和丸粒质量（即密度，静摩擦和颗粒强度。将结果与使用台式成粒机的颗粒生产进行比较。结果表明，摩擦是从单粒压榨机扩大到台式切粒机的关键因素。调节水分含量或提高模头温度并不能显着缓解烘焙木片的颗粒生产。添加菜籽油作为润滑剂可将静摩擦降低一半，并使颗粒的生产稳定。然而，颗粒质量，强度和密度受到负面影响。在250和280°C的温度下焙烧的松木制成的颗粒比未经处理的木材制成的颗粒短，并且其质量不符合常规木质颗粒的标准。然而，与常规的木质颗粒相比，焙烧过的颗粒的热值更高，并且在研磨颗粒后的粒度分布更均匀。

著录项

  • 来源
    《Bioenergy research》 |2014年第1期|87-94|共8页
  • 作者

    Lei Shang; Niels Peter K. Nielsen; Wolfgang Stelte; Jonas Dahl; Jesper Ahrenfeldt; Jens Kai Holm; Maria Puig Arnavat; Lars S. Bach; Ulrik B. Henriksen;

  • 作者单位

    1.Department of Chemical and Biochemical Engineering Technical University of Denmark 2800 Kgs Lyngby Denmark;

    3.Renewable Energy and Transport Danish Technological Institute Gregersensvej 3 2630 Taastrup Denmark;

    3.Renewable Energy and Transport Danish Technological Institute Gregersensvej 3 2630 Taastrup Denmark;

    3.Renewable Energy and Transport Danish Technological Institute Gregersensvej 3 2630 Taastrup Denmark;

    1.Department of Chemical and Biochemical Engineering Technical University of Denmark 2800 Kgs Lyngby Denmark;

    2.Chemical Engineering DONG Energy Thermal Power A/S Nesa Alle 1 2820 Gentofte Denmark;

    1.Department of Chemical and Biochemical Engineering Technical University of Denmark 2800 Kgs Lyngby Denmark;

    1.Department of Chemical and Biochemical Engineering Technical University of Denmark 2800 Kgs Lyngby Denmark;

    1.Department of Chemical and Biochemical Engineering Technical University of Denmark 2800 Kgs Lyngby Denmark;

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  • 正文语种 eng
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  • 关键词

    Wood pellets Torrefaction Pelletization Durability Strength Grinding;

    机译：木屑颗粒造粒耐久性强度研磨;

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