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首页> 外文期刊>Energy Conversion & Management >Comparative studies on the effect of mineral matter on physico-chemical properties, inherent moisture and drying kinetics of Chinese lignite
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Comparative studies on the effect of mineral matter on physico-chemical properties, inherent moisture and drying kinetics of Chinese lignite

机译：矿物对褐煤理化性质，固有水分和干燥动力学影响的比较研究

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摘要

The comparative study between the high-ash lignite (HAS) and low-ash lignite (LAS) demonstrated great effects of mineral matter on physico-chemical properties, inherent moisture and drying kinetics of Chinese lignite. The physico-chemical properties were characterized by X-ray diffraction (XRD), N-2 physisorption, fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), and thermoanalytical methods. Raw and treated samples (screening, dry beneficiation, and flotation) were analyzed for inherent moisture content. Drying kinetic experiments were performed by isothermal thermogravimetry in combination with thin-layer models. In comparison with LAS, HAS had less cohesive features with higher amounts of heterogeneous crystalline minerals, less quantity of O-containing functional groups, and smaller surface areas as well as lower pore volumes, as evidenced by characterization analysis. Less cohesive features could allow the moisture to move easily through the lignite, which thus resulted in a lower inherent moisture contained in HAS. On the other hand, due to higher thermal conductivity and poorer holding-moisture structures resulted from the presence of abundant minerals, HAS revealed more promising drying kinetics with lower activation energies, which were determined by the combination of isothermal experiments and Page model analyses. (C) 2015 Elsevier Ltd. All rights reserved.
机译：高灰分褐煤（HAS）和低灰分褐煤（LAS）之间的比较研究表明，矿物质对中国褐煤的理化性质，固有水分和干燥动力学具有很大的影响。通过X射线衍射（XRD），N-2物理吸附，傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM）和热分析方法对理化性质进行了表征。对原始和处理过的样品（筛分，干法选矿和浮选）进行固有水分含量分析。干燥动力学实验是通过等温热重法结合薄层模型进行的。与LAS相比，HAS具有较少的内聚特征，具有较高数量的非均质结晶矿物，较少数量的含O官能团，较小的表面积以及较小的孔体积，如特征分析所示。内聚力较小的特征可能会使水分容易地穿过褐煤，从而导致HAS中所含的固有水分降低。另一方面，由于存在大量矿物质而导致较高的热导率和较差的保持水分结构，HAS揭示了具有较低活化能的更有希望的干燥动力学，这是通过等温实验和Page模型分析相结合确定的。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Energy Conversion & Management》 |2015年第3期|197-204|共8页
  • 作者

    Zhao Pengfei; Zhong Liping; Zhao Yuemin; Luo Zhenfu;

  • 作者单位

    China Univ Min & Technol, Sch Elect Power Engn, Xuzhou 221116, Peoples R China|China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Peoples R China;

    China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Peoples R China;

    China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Peoples R China;

    China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Peoples R China;

  • 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

    Lignite; Characterization; Inherent moisture; Drying kinetics;

    机译：褐煤;表征;固有水分;干燥动力学;

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