Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, PR China.
Department of Environmental Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
Bioresour Technol. 2019 Dec;293:122087. doi: 10.1016/j.biortech.2019.122087. Epub 2019 Aug 29.
In this study, the effect of torrefaction on the gasification reactivity of chars from raw and torrefied biomass was investigated. Three torrefaction temperatures and four pyrolysis temperatures were taken into consideration. It was found that the severe torrefaction (300 °C) would reduce the char gasification reactivity by at least 19% according to the normalized gasification rate. Moreover, the reduction of gasification reactivity appeared after the midterm stage. The gasification reaction were further analyzed by nucleation/growth model and model-free method. The activation energy increased by ~80 kJ/mol with conversion, indicating an enhancement of the reaction resistance. Furthermore, 800 °C pyrolysis was found to be a turning point, beyond which the gasification reactivity reduced significantly. These reactivity changes were implied by the bio-char structure evolution and active alkali and alkaline earth metals (AAEMs) contents variations. The research results provide insights into the effect of torrefaction on biomass gasification.
在这项研究中，考察了热解对生物质原焦和热解焦气化反应性的影响。考虑了三个热解温度和四个热解温度。结果表明，根据归一化气化速率，剧烈热解（300°C）至少会降低 19%的焦气化反应性。此外，这种降低的趋势出现在中期阶段之后。通过成核/生长模型和无模型方法进一步分析了气化反应。随着转化率的增加，活化能增加了约 80kJ/mol，表明反应阻力增强。此外，发现 800°C 热解是一个转折点，超过这个点，气化反应性会显著降低。这些反应性变化与生物炭结构演化以及活性碱金属和碱土金属（AAEMs）含量的变化有关。研究结果为热解对生物质气化的影响提供了深入的了解。
