Examinations of chemical properties and pyrolysis behaviors of torrefied woody biomass prepared at the same torrefaction mass yields
Examinations of chemical properties and pyrolysis behaviors of torrefied woody biomass prepared at the same torrefaction mass yields
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DOI：
10.1016/j.jaap.2015.08.007
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发表时间：
2015-09
影响因子：
6
通讯作者：
J. Wannapeera;Nakorn Worasuwannarak
中科院分区：
文献类型：
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作者：
J. Wannapeera;Nakorn Worasuwannarak
以银合欢为试材，在相同的焙烘质量产率下，采用不同的焙烘温度和焙烘时间进行焙烘。选择三个烘焙质量产率值; 60重量%、70重量%和80重量%。对于每个烘焙质量产率，改变三至四个烘焙温度和保持时间。结果发现，在80重量%的焙烧质量收率的焙烧银合欢的元素组成不受焙烧条件的影响。另一方面，在60wt%的焙烧质量产率的焙烧银合欢的碳含量增加，而焙烧银合欢的氧含量随着焙烧温度的升高而降低。从热解过程中的TGA分析中发现，重量下降曲线几乎相同，并且它们不依赖于烘焙条件，烘焙质量产率为70wt%和80wt%。另一方面，在60wt%的焙烧质量产率下制备的银合欢的热解行为观察到显着差异。在320 °C和6 min保温时间下制备的银合欢焙烘物在800 °C下的成炭率高达27.0%，而在其他条件下制备的银合欢焙烘物的成炭率约为24.0%。通过纤维素热解过程中气体形成的结果和XRD分析，可以得出结论，320 °C和6 min保持时间的烘焙导致银合欢结构中纤维素的显著改性，从而导致与其他烘焙条件相比不同的化学性质。
The torrefaction of leucaena at the same torrefaction mass yield, but different torrefaction temperatures and holding times was conducted. Three values of torrefaction mass yields were selected; 60 wt%, 70 wt%, and 80 wt%. For each torrefaction mass yield, three to four torrefaction temperatures and holding times were varied. It was found that the elemental compositions of the torrefied leucaena at the torrefaction mass yield of 80 wt% were not affected by the torrefaction condition. On the other hand, at the torrefaction mass yield of 60 wt% the carbon content of the torrefied leucaena increased, while the oxygen content of the torrefied leucaena decreased with the increase in torrefaction temperature. From the TGA analysis during the pyrolysis, it was found that the weight decreasing profiles were almost the same and they did not depend on the torrefaction conditions for the torrefaction mass yield of 70 wt% and 80 wt%. On the other hand, the significant difference of the pyrolysis behaviors was observed for the torrefied leucaena prepared at the torrefaction mass yield of 60 wt%. The char yield at 800 °C for the torrefied leucaena prepared at 320 °C and 6 min holding time was as high as 27.0%, while it was around 24.0% for the torrefied leucaena prepared at other conditions. Through the results from the gas formation during the pyrolysis of cellulose and the XRD analysis, it may be concluded that the torrefaction of 320 °C and 6 min holding time led to the significant modification of cellulose in the leucaena structure resulting in the different chemical properties when compared to those other torrefaction conditions.