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首页> 外文学位 >Compaction behavior, mechanical properties, and moisture resistance of torrefied and non-torrefied biomass pellets.
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Compaction behavior, mechanical properties, and moisture resistance of torrefied and non-torrefied biomass pellets.

机译：烘焙和非烘焙生物质颗粒的压实行为，机械性能和耐湿性。

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摘要

Biomass properties have a potential to be improved by torrefaction, a thermal pretreatment process that removes hemicellulose. The intent in using torrefaction for biomass is to increase the carbon content and calorific value, as well as reduce the hydrophilic nature of woody-biomass. To facilitate the handling and use of torrefied biomass, densification (e.g. pelletizing) is used to compact it into standard uniform shape pellets with high density and mechanical strength. In this thesis, torrefaction as pretreatment, as well as moisture content and particle size of raw biomass materials before pelletizing were studied as parameters that may affect the biomass pellet quality including: compaction behavior, gross heating value, hardness, and moisture resistance. Woody biomass red oak (Quercus rubra), and two species of grass-type biomass switchgrass (Panicum virgatum), and miscanthus (Miscanthus giganteus) were used in the experiment. Results of this research indicated that torrefied biomass required 50% ~ 200% more pelletization energy than non-torrefied biomass. Additionally, in general, the hardness of torrefied biomass pellets was lower than non-torrefied pellets. However, it was found that the moisture resistance of the torrefied biomass pellets was higher than the non-torrefied pellets. The moisture content and particle size also showed some relatively small effects on the biomass pellet properties, but their influence varied from species to species, and even between pretreatments within one species. Therefore, based on the results of this research, the better moisture content and particle size for pellet production was specific to each type of pretreatment and species.
机译：生物质特性有可能通过烘焙（一种去除半纤维素的热预处理工艺）来改善。将焙烤用于生物质的目的是增加碳含量和热值，以及降低木质生物质的亲水性。为了便于处理和使用烘焙过的生物质，致密化（例如制粒）用于将其压制成具有高密度和机械强度的标准均匀形状的颗粒。在本文中，研究了干法预处理，制粒前生物质原料的含水量和粒径作为影响生物质颗粒质量的参数，包括压实行为，总热值，硬度和耐湿性。实验中使用了木质生物量的赤栎（Quercus rubra），两种草型生物量柳枝switch（Panicum virgatum）和桔梗（Miscanthus giganteus）。这项研究的结果表明，烘焙过的生物质比未烘焙过的生物质需要多50％〜200％的造粒能量。另外，通常，烘焙的生物质颗粒的硬度低于非烘焙的颗粒。然而，发现烘焙过的生物质颗粒的耐湿性高于未烘焙过的颗粒。水分含量和粒径对生物质颗粒的性质也显示出一些相对较小的影响，但它们的影响因物种而异，甚至在一个物种内进行预处理之间也不同。因此，根据这项研究的结果，用于颗粒生产的更好的水分含量和粒径是特定于每种预处理类型和种类的。

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  • 作者

    Wang, Tianmiao.;

  • 作者单位

    West Virginia University.;

  • 授予单位 West Virginia University.;
  • 学科 Agriculture Forestry and Wildlife.
  • 学位 M.S.
  • 年度 2014
  • 页码 75 p.
  • 总页数 75
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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