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林产化学与工业 ›› 2017, Vol. 37 ›› Issue (6): 35-42.doi: 10.3969/j.issn.0253-2417.2017.06.005

• 研究报告 • 上一篇    下一篇

碱性木质素对玉米秸秆成型特性的影响

李伟振1,2,3, 姜洋1,2,3, 饶曙4, 阴秀丽1,2,3, 蒋恩臣4   

  1. 1. 中国科学院 广州能源研究所, 广东 广州 510640;
    2. 中国科学院 可再生能源重点实验室, 广东 广州 510640;
    3. 广东省新能源和可再生能源研究开发与应用重点实验室, 广东 广州 510640;
    4. 华南农业大学 材料与能源学院, 广东 广州 510642
  • 收稿日期:2017-04-11 出版日期:2017-12-25 发布日期:2018-01-05
  • 通讯作者: 姜洋,副研究员,研究领域为生物质能利用技术;E-mail:jiangyang@ms.giec.ac.cn E-mail:jiangyang@ms.giec.ac.cn
  • 作者简介:李伟振(1983-),男,河南开封人,助理研究员,硕士,主要从事生物质成型技术研究
  • 基金资助:
    国家自然科学基金资助项目(51661145022);广东省科技计划项目(2017A010104009);广州市科技计划项目(201704020189)

Effect of Alkali Lignin on Corn Stalk Pelleting Process

LI Weizhen1,2,3, JIANG Yang1,2,3, RAO Shu4, YIN Xiuli1,2,3, JIANG Enchen4   

  1. 1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
    2. CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China;
    3. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China;
    4. School of Materials and Energy, South China Agricultural University, Guangzhou 510642, China
  • Received:2017-04-11 Online:2017-12-25 Published:2018-01-05

摘要: 为了研究碱性木质素对玉米秸秆成型特性的影响及其软化黏结作用,以玉米秸秆为原料进行压缩成型,考察添加碱性木质素对成型效果的影响。结果表明:碱性木质素能够促进成型,改善成型效果,当添加量由0提高到20%时,玉米秸秆成型颗粒的松弛密度由1 005 kg/m3增大到1 157 kg/m3,径向最大抗压力由1 353 N增大到1 930 N。采用DSC对玉米秸秆和碱性木质素的热转变特征温度进行了研究,结果表明:玉米秸秆和碱性木质素的玻璃态转变温度分别在92.5~103℃、61~137℃之间;在玻璃态转变过程中,100℃时存在比能耗最低点;100~130℃为碱性木质素起较好黏结作用的温度范围。采用SEM对颗粒微观形态进行观察,发现碱性木质素发生玻璃态转变后在颗粒内部能够形成"局部熔融"和"机械互锁"两种结合形式,适合的碱性木质素添加量为10%~15%。

关键词: 压缩成型, 碱性木质素, 黏结机理, 比能耗, 热转变温度, 微观形态

Abstract: In order to study the effect of alkali lignin on corn stalk pelleting process and the bonding mechanism, the influences of four parameters(alkali lignin adding amount, temperature, moisture and pressure) on three technical indicators(relaxed density, radial compressive strength and specific energy consumption) were investigated. The compression molding experiment showed that when alkali lignin adding amount increased from 0 to 20%, the relaxed density of corn stalk pellets increased from 1 005 kg/m3 to 1 157 kg/m3 and the radial compressive strength increased from 1 353 N to 1 930 N. This results suggested that increasing of alkali lignin could promote the corn stalk pelleting process. The thermal transition temperatures of corn stalk and alkali lignin were also studied by differential scanning calorimetry(DSC). The results showed that the glass transition temperatures of corn straw and alkali lignin were between 92.5-103℃ and 61-137℃, respectively. In the thermal transition temperature range, 100℃ was the lowest specific energy consumption with suitable moisture content. The suitable temperature range for alkali lignin bonding was 100-130℃.The microstructure of pellets showed that alkali lignin occurred melting transition after melting temperature and then formed ‘molten combination’ and ‘mechanical interlocking’ inside the particles. The suitable alkali lignin adding amount for bonding was 10%-15%.

Key words: pelleting, alkali lignin, bonding mechanism, specific energy consumption, thermal transition, microstructure

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