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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Comparison and explanation of predictive capability of pellet quality metrics based on fundamental mechanical properties of ground willow and switchgrass
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Comparison and explanation of predictive capability of pellet quality metrics based on fundamental mechanical properties of ground willow and switchgrass

机译：基于地柳和柳枝fundamental基本力学特性的颗粒质量指标预测能力的比较和解释

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摘要

Willow is a light-weight and uniform-grained hardwood, which is a promising bioenergy crop. In this study, physical and mechanical properties of ground willow and quality of willow pellets were determined and compared with already published properties of more commonly used bioenergy crop, i.e., switchgrass. Rational explanations were provided for why certain mechanical properties were correlated well with pellet qualities. To that end, willow was ground with two different screen sizes (3.175 mm and 6.350 mm) and conditioned at two moisture contents (17.5% and 20.0% w.b.). The physical and mechanical properties of ground willow and pellet qualities were determined. Ground willow and switchgrass exhibited similar trends of mechanical properties, however, the magnitudes were different. For ground willow, compression index correlated well with strength of willow pellets, however, bulk modulus and spring-back index showed high correlations in case of switchgrass. This could be an attribute of different physical properties, i.e., particles size distribution, bulk density, and particle density, and chemical compositions. Higher levels of lignin present in willow than switchgrass might produce significant effect of resistance to compressibility. Ground willow underwent plastic deformation, which resulted in a high correlation to compression index. Ground switchgrass was dominated by elastic responses thus highly correlated to bulk modulus and spring-back index. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
机译：柳树是一种轻质均匀的硬木，是一种很有前途的生物能源作物。在这项研究中，确定了地面柳树的物理和机械性能以及柳树颗粒的质量，并将其与更常用的生物能源作物即柳枝already的已发表特性进行了比较。提供了合理的解释，说明为什么某些机械性能与颗粒质量之间具有很好的相关性。为此，将柳树用两种不同的筛网尺寸（3.175mm和6.350mm）磨碎，并在两种水分含量（17.5％和20.0％w.b。）下进行调节。测定了地面柳树的物理机械性能和颗粒质量。柳柳和柳枝switch表现出相似的机械性能趋势，但是强度不同。对于地面柳树，压缩指数与柳树丸粒的强度具有很好的相关性，但是，柳枝bulk的体积模量和回弹指数显示出很高的相关性。这可能是不同物理性质的属性，即粒度分布，堆积密度和颗粒密度以及化学组成。与柳枝switch相比，柳树中木质素含量更高可能会产生显着的抗压缩性效果。柳柳发生塑性变形，这与压缩指数高度相关。地面柳枝was以弹性响应为主，因此与体积模量和回弹指数高度相关。 （C）2016日本粉末技术学会。由Elsevier B.V.和日本粉末技术学会出版。版权所有。

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