Comparative Study of Atmosphere Effect on Wood Torrefaction
Comparative Study of Atmosphere Effect on Wood Torrefaction
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DOI：
10.3390/fib11030027
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发表时间：
2023-03
期刊：
影响因子：
3.9
通讯作者：
R. Quirino;L. Richa;A. Pétrissans;P. R. Teixeira;George Durrell;Allen Hulette;Baptiste Colin;
中科院分区：
文献类型：
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作者：
R. Quirino;L. Richa;A. Pétrissans;P. R. Teixeira;George Durrell;Allen Hulette;Baptiste Colin;
气候变化、生物质利用和生物能源回收是当前全球最大的问题之一。木材被认为是一种环境友好的材料。然而，它必须被处理用于期望的应用。在180 °C至280 °C范围内的热处理后，在低氧浓度下，木材成为具有改进的尺寸稳定性、抗真菌侵袭性、可研磨性、疏水性和储存稳定性的材料。在过去的几十年里，人们研究了几种木材处理策略，包括使用蒸汽、氮气、烟雾、真空、水和热油。研究了压力和气氛对白杨干燥的影响。通过系统的分析，白杨木材样品在减压和不同的气氛下处理，同时保持相同的加热曲线，它是可能的，以建立观察到的质量损失，颜色变化，木材成分（通过TGA/DTG分析），官能团（通过FTIR），元素分析，和X-射线衍射图的变化直接涉及到已知的反应途径发生在烘焙过程中。在减压下观察到的变化与反应气氛中氧的相对浓度和处理过程中反应性副产物经历的减少的扩散时间有关。相反，延长扩散时间导致在N2，水蒸气和空气下进行的反应发生更显著的变化。
Climate change, biomass utilization, and bioenergy recovery are among the biggest current global concerns. Wood is considered an environmentally benign material. Nevertheless, it must be processed for desired applications. Upon thermal treatment ranging from 180 °C to 280 °C, under low oxygen concentrations, wood becomes a material with improved dimensional stability, resistance to fungal attacks, grindability, hydrophobicity, and storage stability. Several strategies for wood treatment have been investigated over the course of the past decades, including the use of steam, nitrogen, smoke, vacuum, water, and hot oil. The goal of this work is to investigate the influence of pressure and atmosphere on the torrefaction of poplar. Through a systematic analysis of poplar wood samples treated under reduced pressures and different atmospheres, while keeping the same heating profile, it was possible to establish that changes observed for mass loss, color change, wood composition (via TGA/DTG analysis), functional groups (via FTIR), elemental analysis, and X-ray diffractograms relate directly to known reaction pathways occurring during torrefaction. Changes observed under reduced pressures have been associated with the relative concentration of oxygen in the reaction atmosphere and to the reduced diffusion times experienced by reactive by-products during the treatment. Conversely, extended diffusion times resulted in more significant changes for reactions carried out under N2, water vapor, and air.