杨木与甘蔗渣共热解的研究

Study of Co-Pyrolysis Characteristics on Poplar Wood and Bagasse

本研究利用热重分析仪研究了甘蔗渣和杨木的热解特性,并分析了混合比例对甘蔗渣和杨木共热解特性的影响,并利用热裂解仪–气相色谱/质谱联用仪(Py-GC/MS)研究了甘蔗渣和杨木共热解的产物分布。结果表明,杨木的热解过程主要分为三个阶段,而甘蔗渣的热解过程则被分为四个阶段。甘蔗渣的添加无法改变起始热解温度但使得最大热解速率对应温度向高温区移动,这说明共混会延缓纤维素的热解。共混物的半纤维素热解阶段表观活化能相较于杨木和甘蔗渣更高,这说明共混抑制了半纤维素的热解。而当杨木含量较高的情况下,纤维素热解活化能最低,这表明杨木和甘蔗渣共热解的纤维素热解阶段存在协同作用。此外,杨木和甘蔗渣的共热解还对于醛类化合物的生成具有协同作用,可以提高其相对含量。

In this study, the pyrolysis characteristics of bagasse and poplar were studied by the thermogravi-metric analyzer, and the effect of mixing ratio on the co-pyrolysis characteristics of bagasse and poplar was analyzed. The product distribution of co-pyrolysis of bagasse and poplar was studied by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The results showed that the pyroly-sis process of poplar was mainly divided into three stages, while the pyrolysis process of bagasse was divided into four stages. The addition of bagasse could not change the initial pyrolysis temper-ature but moved the maximum pyrolysis rate corresponding temperature to a higher temperature area, showing that the blending would delay the pyrolysis of cellulose. The apparent activation energy of the blends in the pyrolysis stage of hemicellulose is higher than that of poplar and bagasse, indicating that the blends inhibit the pyrolysis of hemicellulose. When the content of poplar was high, the activation energy of cellulose pyrolysis was the lowest, which indicated that there was a synergistic effect of the two pyrolyses in the cellulose pyrolysis stage. In addition, the co-pyrolysis of poplar and bagasse also has a synergistic effect on the formation of aldehydes, which can increase their relative content.