木质装饰板材贫氧条件下燃烧和热解特性研究

发布时间：2018-12-11 18:00

【摘要】：本文利用热重差热分析仪,在各种不同的氧气浓度下对落叶松、红木和红松样品进行实验。通过对TG、DTG和DTA曲线的分析,样品干燥基要经历两个失重过程,第一个失重过程主要是纤维素和半纤维素的热解,第二个失重过程主要是木质素的炭化分解和燃烧。在各氧气浓度条件下,热解失重的第一个阶段TG和DTG曲线差异很小;在各样品失重的第二个阶段,随着氧气浓度的增加,TG和DTG曲线左移,反应结束的温度明显降低。氧气能使木质素的炭化物氧化并进而可能使其着火燃烧,从而使反应进程加快。当氧气浓度大于6.32%时,各样品DTA曲线上均有两个明显放热峰,并且随着氧气浓度的增加,DTA曲线放热峰越尖锐,放热峰面积越大,说明氧气浓度越大,在两阶段失重过程中更多的挥发分物质和固体炭化物参与燃烧。
[Abstract]:In this paper, the samples of Larix gmelinii, Redwood and Pinus koraiensis were tested at different oxygen concentrations by thermogravimetric differential calorimetry (TGA). Through the analysis of TG,DTG and DTA curves, it was found that the dry base of the sample underwent two weightlessness processes: the first was pyrolysis of cellulose and hemicellulose, and the second was carbonization and combustion of lignin. The difference between TG and DTG curves in the first stage of pyrolysis weightlessness is very small at different oxygen concentrations, and in the second stage of weight loss, with the increase of oxygen concentration, the TG and DTG curves shift to the left, and the temperature at the end of the reaction obviously decreases. Oxygen oxidizes the carbonized lignin and may ignite it, thus speeding up the reaction. When oxygen concentration is greater than 6.32, there are two obvious exothermic peaks on the DTA curve of each sample, and with the increase of oxygen concentration, the more sharp the exothermic peak of DTA curve is, the larger the area of exothermic peak is, which means that oxygen concentration is larger. In the two-stage weightlessness process, more volatile substances and solid carbonization participate in the combustion.
【作者单位】：沈阳航空工业学院清洁能源与环境工程研究所沈阳航空工业学院清洁能源与环境工程研究所沈阳航空工业学院清洁能源与环境工程研究所沈阳航空工业学院清洁能源与环境工程研究所
【基金】：航空科学基金资助项目(No．04H54007)
【分类号】：TU564

【参考文献】