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Effects of various inorganic sodium salts present in Zhundong coal on the char characteristics

机译：准东煤中各种无机钠盐对焦特性的影响。

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摘要

This study aims to clarify the effects of inherent inorganic sodium salts present in Zhundong coal on the morphology, element composition, structures, and reactivities of chars from fast pyrolysis. The concentration of the main anions present in the raw coal determined by ion chromatography indicates that Na could exist in the forms of NaCl, Na2SO4, NaNO3, CH3COONa (NaAc), and NaHCO3, which were then loaded on acid-washed coal respectively by wet impregnation. The pH changes of slurries after the adding of NaAc and Na2CO3 illustrated that sodium carboxylate (-COONa) was generated. The characteristics of chars obtained by fast pyrolysis of the prepared coals in a drop tube furnace were determined. Scanning electron microscopy and energy dispersive X-ray fluorescence spectroscopy of chars revealed that loaded Na, especially -COONa, could be retained on the char surface and inhibit smoothing of the particle surfaces during pyrolysis. Raman intensity indicated that loose char structures formed in chars derived from sodium-loaded coals as a result of inhibiting the process of graphitization and increasing cross-linking density and the number of substitutional groups during fast pyrolysis. Specific reactivities of chars prepared at 900 degrees C increased in the order: H-char-900 < Na2SO4-char similar to NaCl-char < NaNO3-char < NaAc-char < Na2CO3-char, which may be attributed to the combined effects of active Na, active sites, and loose char structures. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本研究旨在阐明准东煤中固有的无机钠盐对快速热解焦炭的形态，元素组成，结构和反应性的影响。离子色谱法测定的原煤中主要阴离子的浓度表明，Na可以NaCl，Na2SO4，NaNO3，CH3COONa（NaAc）和NaHCO3的形式存在，然后通过湿法分别装载在酸洗的煤上浸渍。加入NaAc和Na2CO3后，浆料的pH值变化说明生成了羧酸钠（-COONa）。测定了通过在滴管炉中快速热解制得的煤而获得的炭的特性。炭的扫描电子显微镜和能量色散X射线荧光光谱显示，负载的Na（尤其是-COONa）可以保留在炭表面，并在热解过程中抑制颗粒表面的光滑。拉曼强度表明，在快速热解过程中，由于抑制了石墨化过程并增加了交联密度和取代基的数量，因此在载有钠的煤中生成的焦炭中形成了松散的焦炭结构。在900摄氏度下制备的炭的比反应性依次提高：H-char-900

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  • 来源
    《Fuel》 |2017年第1期|120-127|共8页
  • 作者

    Xu Lianfei; Liu Hui; Fang Hang; Gao Jihui; Wu Shaohua;

  • 作者单位

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, 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

    Zhundong coal; Drop tube furnace; Sodium salts; Char reactivity;

    机译：准东煤;落管炉;钠盐;焦炭反应性;

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