Chemical Engineering School, Department of Wood Engineering, University of Bío-Bío, Concepción, Chile.
Technological Development Unit, University of Concepción, Coronel, Chile.
Bioresour Technol. 2017 Aug;238:194-204. doi: 10.1016/j.biortech.2017.04.037. Epub 2017 Apr 11.
Steam torrefaction of Eucalyptus globulus was performed at temperatures between 245°C and 265°C in a 100kg/h pilot plant. Torrefied biomass was then pelletized in a 300kg/h unit and the pellets were subject to durability, density and combustion tests. The structural changes measured with FTIR were studied along with the combustion behavior of the materials. Compositional analysis showed that increasing the torrefaction temperature reduced both hemicellulose fraction and overall mass yield (MY). Furthermore, there was a linear relationship between the energy yield (EY) and mass yield (EY=[1.04-0.9(1-MY)]) for these samples. The ignition and comprehensive indexes confirmed that the stability of the torrefied biomass in a combustion environment was higher than for untreated biomass. Finally, pellets showed high durability (98%), and had an energy density (13-14GJ/m), which is comparable to low-rank coals.
在 100kg/h 的试验工厂中，温度在 245°C 至 265°C 之间对桉树进行了蒸汽热解。然后，将热解生物质在 300kg/h 的单元中制粒，并对颗粒进行耐久性、密度和燃烧测试。用傅里叶变换红外光谱法（FTIR）测量结构变化，并研究材料的燃烧行为。组成分析表明，随着热解温度的升高，半纤维素分数和整体质量产率（MY）都会降低。此外，这些样品的能量产率（EY）和质量产率（EY=[1.04-0.9(1-MY)])之间存在线性关系。点火和综合指数证实，在燃烧环境中，热解生物质的稳定性高于未经处理的生物质。最后，颗粒显示出高耐久性（98%），且具有与低阶煤相当的能量密度（13-14GJ/m）。
