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首页> 外文期刊>Bioenergy research >Measurement of Mechanical Compressive Properties and Densification Energy Requirement of Miscanthus × giganteus and Switchgrass
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Measurement of Mechanical Compressive Properties and Densification Energy Requirement of Miscanthus × giganteus and Switchgrass

机译：芒草×柳枝Switch机械压缩特性和致密化能量需求的测定。

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摘要

Lignocellulosic biomass in bale form has a low bulk density. Current in-field balers can achieve a bulk density of merely 120 to 180 kg dry matter (DM) m−3, whereas modern high-compression cutting balers produce up to 230 kg m−3. Mechanical compression is a straightforward technique to increase the material density, which significantly improves the efficiency of transportation and storage, and simplifies handling. Traditional compression technology mainly produces pellets, but conceivably bales could be compressed to a higher density as well. To design compression machinery in general, it is essential to determine the mechanical properties of biomass under compression and compression energy consumption. In addition, the material rebound percentage after compression is needed to design low-cost containerization methods for highly compressed bales. In this research, we established pressure–bulk density relationships and calculated Poisson’s ratio for Miscanthus (Miscanthus × giganteus, Poaceae/Gramineae) and switchgrass (Panicum virgatum L. Poacea/Gramineae). We also calculated rebound percentages for Miscanthus in two particle sizes. The results showed that the energy consumption for compression of Miscanthus and switchgrass is low, ranging from 0.01 to 0.05 % of the inherent heating value of the materials. Poisson’s ratios of Miscanthus and switchgrass ranged from 0.2 to 0.3 for various particle sizes. The rebound percentage was found as 28 % for unground Miscanthus and 23 % for Miscanthus ground to 6.35-mm particles. A common opinion is that high-level compression of biomass may reduce its energy content. Although in this research some of the biomass was exposed to an extreme pressure of 750 MPa, microscopic imagery revealed no fractions in the cell walls, leading to the conjecture that compression does not negatively impact the conversion potential of the biomass.
机译：大包形式的木质纤维素生物质的堆积密度低。当前的野外打包机只能实现120至180 kg干物质（DM）m-3的堆密度，而现代的高压缩切割打包机可以产生230 kg kgm-3的密度。机械压缩是增加材料密度的直接技术，可显着提高运输和存储的效率，并简化处理。传统的压缩技术主要生产粒料，但可以想象，也可以将棉包压缩到更高的密度。通常，要设计压缩机械，必须确定压缩和压缩能耗下生物质的机械性能。此外，压缩后的物料回弹百分比对于设计用于高度压缩的棉包的低成本集装箱化方法是必需的。在这项研究中，我们建立了压力-散装密度关系，并计算了芒草（Miscanthus×giganteus，禾本科/禾本科）和柳枝（（Panicum virgatum L. Poacea /禾本科）的泊松比。我们还计算了两种粒径的芒草的反弹百分比。结果表明，压缩芒草和柳枝switch的能量消耗很低，占材料固有热值的0.01％至0.05％。各种粒径的芒草和柳枝的泊松比范围从0.2到0.3。发现未磨碎的芒草的反弹百分比为28％，而磨碎的芒草的反弹百分比为23％，达到6.35毫米颗粒。人们普遍认为，对生物质进行高水平压缩可能会降低其能量含量。尽管在这项研究中，一些生物质暴露在750 MPa的极端压力下，但显微图像显示细胞壁中没有碎片，导致人们猜测压缩不会对生物质的转化潜力产生负面影响。

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  • 来源
    《Bioenergy research》 |2015年第1期|152-164|共13页
  • 作者

    Zewei Miao; James W. Phillips; Tony E. Grift; Sunil K. Mathanker;

  • 作者单位

    1.Energy Biosciences Institute University of Illinois at Urbana-Champaign 1206 West Gregory Drive Urbana IL 61801 USA 2.Department of Agricultural and Biological Engineering University of Illinois at Urbana-Champaign 1304 West Pennsylvania Avenue Urbana IL 61801 USA;

    3.Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign 1206 West Green Street Urbana IL 61801 USA;

    1.Energy Biosciences Institute University of Illinois at Urbana-Champaign 1206 West Gregory Drive Urbana IL 61801 USA 2.Department of Agricultural and Biological Engineering University of Illinois at Urbana-Champaign 1304 West Pennsylvania Avenue Urbana IL 61801 USA;

    1.Energy Biosciences Institute University of Illinois at Urbana-Champaign 1206 West Gregory Drive Urbana IL 61801 USA 2.Department of Agricultural and Biological Engineering University of Illinois at Urbana-Champaign 1304 West Pennsylvania Avenue Urbana IL 61801 USA;

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  • 正文语种 eng
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  • 关键词

    Bioenergy Biomass feedstock Poisson’s ratio Rebounding force Particle structure;

    机译：生物能源生物质原料泊松比回弹力颗粒结构;

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