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Sawdust age affect aldehyde emissions in wood pellets

机译：木屑年龄影响木屑颗粒中的醛排放

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摘要

The environmental and energy policies in most nations worldwide aim at replacing fossil fuels with renewable sources of energy. The use of wood pellets made from sawdust is rapidly increasing. Wood pellets are a refined compacted fuel with high energy density and low emissions during combustion. Sawdust and wood pellets may be stored for several months due to seasonal demand variation and wood-fuel trade. Wood contains unsaturated fatty acids susceptible to oxidation, a process commonly referred to as fats going rancid. The level of oxidation in pellets is an important parameter of pellets quality as oxidation during storage causes problems such as self-ignition of pellets stored in silos and emissions of malodorous compounds. The purpose of this work was to investigate the effect of the age of the raw material on the oxidation caused aldehyde emissions from wood pellets. Pellets were produced from Scots pine {Pinus sylvestris) sawdust that was either freshly sawn or had been stored for 4 months. The pellets were then stored in either 18 ℃ or in 40 ℃. The formation of the aldehyde hexanal was analyzed with static headspace and gas chromatography. Pellets made from fresh sawdust were low-emitting after 80 days, whereas pellets made from aged sawdust did not reach the same low level until 190 days after production. This held true whether the pellets were stored in 18 ℃ or in 40 ℃. The aged sawdust pellets had maximum emissions at the same time as the emissions ceased from the fresh sawdust pellets. A key conclusion is that when a low level of aldehyde emissions is required during storage, the pellets should be produced of sawdust that is freshly sawn.
机译：全球大多数国家/地区的环境和能源政策旨在用可再生能源替代化石燃料。由木屑制成的木屑颗粒的使用正在迅速增加。木质颗粒是一种精制的压实燃料，在燃烧过程中具有高能量密度和低排放。由于季节性需求变化和木材燃料贸易，木屑和木屑颗粒可能会保存几个月。木材含有易氧化的不饱和脂肪酸，该过程通常被称为腐烂脂肪。粒料中的氧化水平是粒料质量的重要参数，因为在储存过程中的氧化会引起诸如储存在筒仓中的粒料自燃和恶臭化合物排放等问题。这项工作的目的是调查原材料的使用年限对木屑颗粒中由氧化引起的醛排放的影响。药丸是用新锯的或已保存4个月的苏格兰松（Pinus sylvestris）锯末生产的。然后将粒料储存在18℃或40℃下。用静态顶空和气相色谱分析醛己醛的形成。用新鲜的木屑制成的颗粒在80天后排放低，而使用老的木屑制成的颗粒直到生产后190天才达到相同的低水平。无论颗粒是在18℃还是40℃下保存都是如此。老化的木屑颗粒排放量最大，同时新鲜木屑颗粒停止排放。一个关键的结论是，当在存储过程中需要低水平的醛排放时，应使用刚锯过的锯末生产颗粒。

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  • 来源
    《Fuel》 |2014年第15期|219-223|共5页
  • 作者

    Karin M. Granstroem;

  • 作者单位

    Department of Engineering and Chemical Sciences, Karlstad University, 651 88 Karlstad, Sweden;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aldehydes; Emission; Hexanal; Oxidation; Storage;

    机译：醛;发射;己醛;氧化;存储;

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