生物油热失重特性研究

RESEARCH OF THERMAL WEIGHT LOSS OF BIO-OIL

利用TG-FTIR技术,对生物油在不同载气流量、升温速率、气体氛围下的失重特性进行研究。结果表明:在N2气氛中生物油的失重过程可分为3个阶段,分别是小分子物质的蒸发、酚类等重质组分的热解及缩合缩聚和焦炭的生成;在空气气氛中生物油的失重过程也可被分为3个阶段,但分别是小分子物质的蒸发,重质组分的热解、氧化和缩合缩聚,焦炭的燃烧。对生物油热失重动力学特性进行研究,获得反应活化能、频率因子等热解动力学参数。结果表明:随着升温速率的增大,各阶段活化能均有所减小。

The characteristics of thermal weight loss of bio-oil in different reaction condition, such as different carrier flow, heating rate and gas atmosphere were studied using the thermogravimetric analyzer coupled with Fourier transform infrared spectroscopy （TG-FTIR）. The results show that the process of thermal weight loss of bio-oil in nitrogen can be separated into three stages, namely the volatilization of the small molecules, the pyrolysis and polymerization of the heavy components such as phenols and the formation of coke. The process of thermal weight loss of bio-oil in air also can be separated into three stages, namely the volatilization of the small molecules, the pyrolysis, oxidation and polymerization of the heavy components and the combustion of coke. The pyrolysis kinetic parameters such as activation energy of reaction and frequency factor were obtained through studying kinetic characteristics of thermal weight loss of bio-oil. The results show that the activation energies for different stages decrease with the increase of heating rate.