Effects of moisture content, torrefaction temperature, and die temperature in pilot scale pelletizing of torrefied Norway spruce
Effects of moisture content, torrefaction temperature, and die temperature in pilot scale pelletizing of torrefied Norway spruce
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DOI：
10.1016/j.apenergy.2012.08.046
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发表时间：
2013-02
期刊：
影响因子：
11.2
通讯作者：
Sylvia H. Larsson;Magnus Rudolfsson;Martin Nordwaeger;I. Olofsson;R. Samuelsson
中科院分区：
文献类型：
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作者：
Sylvia H. Larsson;Magnus Rudolfsson;Martin Nordwaeger;I. Olofsson;R. Samuelsson
以析因设计进行烘焙挪威云杉的中试规模造粒，其中控制因素为两个水平：材料水分含量（11%和15%）和烘焙温度（270和300°C），以及作为非控制因素的模具温度（60-105°C）。与商业木屑颗粒相比，生产的颗粒具有相当的堆积密度（630- 710 kg/m3），但颗粒耐久性较低（80-90%）。尽管使用了短得多的模具通道长度（35 mm：s对55 mm：s），但用于焙烧材料的造粒的能量消耗比软木造粒高约100%，并且细粉的量高（10-30%）。模头温度与颗粒生产率呈强正相关。物料水分含量对颗粒质量和生产率的影响很小，但由于流动性差，添加水会产生处理问题。
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.