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Application of small angle X-ray scattering in evaluation of pore structure of superfine pulverized coal/char

机译：小角度X射线散射在超细煤粉/焦炭孔隙结构评价中的应用

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摘要

Superfine pulverized coal as a new energy utilization method plays a significant role in alleviating pollutant emissions. It is of great interest to study the physicochemical properties of superfine pulverized coal. Pore structures acting as the channel of heat and mass transfer change with temperatures, coal ranks and pyrolysis atmospheres, etc. The investigation of the pore structure evolution during coal pyrolysis is beneficial for understanding the pyrolysis mechanisms, and guiding the practical application of superfine pulverized coal. Synchrotron radiation small angle X-ray scattering (SAXS) is a nondestructive test method with high accuracy, which can detect the open and closed pores simultaneously. Furthermore, the fractal dimensions were adopted here to characterize the coal pore structures quantitatively. The final results indicated that the fractal dimensions of pore surfaces decreased with the increase of coal ranks. Moreover, as elevating the pyrolysis temperatures, the fractal dimensions increased initially up to about 550 degrees C, and decreased afterwards in the lower temperature region (<800 degrees C). When the temperature is higher than 800 degrees C, there was a monotonically increasing trend of the fractal dimensions. In addition, the influence of different pyrolysis atmospheres on the pore networks was also discussed in the work. The results provide new insights into the influence of particle sizes on the evolution of pore structures during coal pyrolysis, and are helpful for developing representative molecular models of superfine pulverized coal. (C) 2016 Elsevier Ltd. All rights reserved.
机译：超细粉煤作为一种新的能源利用方法，在减少污染物排放方面起着重要作用。研究超细粉煤的理化性质具有重要意义。孔结构作为传热传质的通道随温度，煤级和热解气氛等的变化而变化。研究煤热解过程中的孔结构演变有助于理解热解机理，指导超细粉煤的实际应用。 。同步辐射小角度X射线散射（SAXS）是一种高精度的无损检测方法，可以同时检测开孔和闭孔。此外，这里采用分形维数来定量表征煤孔结构。最终结果表明，孔隙表面的分形维数随煤级的增加而减小。此外，随着热解温度的升高，分形维数最初增加至大约550摄氏度，然后在较低的温度区域（<800摄氏度）减小。当温度高于800℃时，分形维数呈单调增加趋势。此外，在工作中还讨论了不同的热解气氛对孔网络的影响。研究结果为煤热解过程中粒径对孔结构演变的影响提供了新的见解，并有助于开发具有代表性的超细煤粉分子模型。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2016年第1期|190-198|共9页
  • 作者

    Luo Lei; Liu Jiaxun; Zhang Yuchen; Zhang Hai; Ma Junfang; You Yulong; Jiang Xiumin;

  • 作者单位

    Shanghai Jiao Tong Univ, Inst Thermal Energy Engn, Sch Mech Engn, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Inst Thermal Energy Engn, Sch Mech Engn, Shanghai 200240, Peoples R China;

    China Perfect Machinery Ind Corp Ltd, Shanghai 200061, Peoples R China;

    Shanghai Jiao Tong Univ, Inst Thermal Energy Engn, Sch Mech Engn, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Inst Thermal Energy Engn, Sch Mech Engn, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Inst Thermal Energy Engn, Sch Mech Engn, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Inst Thermal Energy Engn, Sch Mech Engn, Shanghai 200240, 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

    Superfine pulverized coal; Pyrolysis; Pore structure; SAXS; Fractal dimension;

    机译：超细煤粉;热解;孔结构;SAXS;分形维数;

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