Structural and compositional changes in eucalyptus wood chips subjected to dry torrefaction
Structural and compositional changes in eucalyptus wood chips subjected to dry torrefaction
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DOI：
10.1016/j.indcrop.2017.09.010
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发表时间：
2017-12-15
影响因子：
5.9
通讯作者：
Trugilho, Paulo F.
中科院分区：
文献类型：
--
作者：
Simoes da Silva, Carlos Miguel;Vital, Benedito Rocha;Trugilho, Paulo F.
本研究的目的是评价桉树木屑在干燥干燥过程中结构和成分的变化。实验在带间接加热系统的半连续式螺杆反应器中进行。三种初始水分含量（0、15%和30%干基）的木屑样品在三种正常温度（220、260和300摄氏度）和三次加热时间（10、15和20分钟）下固化。通过对碳化木屑的化学成分、热重分析和机械耐久性分析，评价了这些变量的影响。随着温度和时间的增加，以及初始含水率的下降，木屑的结构和成分发生了显著的变化。与未经处理的样品相比，碳化后的样品具有更高的耐热性、更易碎的结构、更高的木质素和更低的多糖含量。这些变化使得提高桉树木片用作固体燃料的质量成为可能。
The aim of this study was to evaluate the structural and compositional changes in eucalyptus wood chips subjected to dry torrefaction. The experiment was conducted in a semi-continuous screw reactor with indirect heating system. Wood chips samples of three initial moisture contents (0, 15 and 30% dry basis) were torrefied up to three fmal temperatures (220, 260 and 300 degrees C) and at three heating times (10, 15 and 20 min). The effect of these variables was evaluated through the analysis of chemical composition, thermogravimetry and mechanical durability of the torrefied wood chips. The increase at temperature and time of torrefaction, as well as the drop in the initial moisture content, promoted significant structural and compositional changes in the wood chips. The torrefied samples present a higher resistance to thermal degradation, more friable structure, higher lignin and lower polysaccharides contents than the untreated samples. These changes made it possible to increase the quality of the eucalyptus wood chips to be use as a solid fuel.