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Coal macerals separation by reflux classification and thermo-swelling analysis based on the Computer Aided Thermal Analysis

机译：基于计算机辅助热分析的回流分类和热溶胀分析分离煤渣

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摘要

The reflux classifier is a water based device designed for classifying and separating particles using inclined plates. Particles of sufficiently high settling rate are refluxed back to the slurry, while slow settling particles (low density vitrinites) are removed in the overflow. In this study, the reflux classifier was used to separate coal macerals less than 212 urn in size. The thermo-swelling characteristics of separated macerals were evaluated on the basis of the Computer Aided Thermal Analysis (CATA) technique with extended volumetric measurements. A suite of maceral concentrates with various densities, ash contents, particle sizes and vitrinite percentages was obtained, which indicated that the reflux classifier can offer an alternative method of macerals separation/concentration without the use of dense media. The pyro-lysis experiments of maceral concentrates indicated that the vitrinite-rich macerals showed a higher extent of volumetric swelling, exothermic reactions and thermal conductivity between 400 and 600 ℃ than inertinite-rich macerals. Addition of inertinite to vitrinite concentrates showed that inertinite can suppress volumetric swelling and shift the swelling to a higher temperature during the primary devola-tilization, but does not have a significant influence on high temperature contraction. Further observations about the interaction among different maceral groups were also discussed in this study.
机译：回流分级机是一种水基设备，设计用于使用倾斜板对颗粒进行分级和分离。沉降速率足够高的颗粒回流到浆液中，而沉降缓慢的颗粒（低密度镜质体）则从溢流口中去除。在这项研究中，回流分级器用于分离尺寸小于212微米的煤黄石。在计算机辅助热分析（CATA）技术的基础上，采用扩展的体积测量方法，对分离出的化学成分的热膨胀特性进行了评估。获得了一套具有各种密度，灰分含量，粒径和镜质体百分比的黄斑精矿，这表明回流分级机可以提供一种无需使用致密介质的黄斑分离/浓缩的替代方法。高岭土浓缩物的热解实验表明，在400-600℃之间，富含镜质体的矿物比富惰质的矿物具有更高的体积溶胀，放热反应和热导率。在镜质精矿中添加惰质岩表明，惰质岩在初次挥发时可抑制体积溶胀并将溶胀转移至更高的温度，但对高温收缩没有显着影响。在这项研究中，还讨论了有关不同Maceral组之间相互作用的进一步观察。

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  • 来源
    《Fuel》 |2013年第1期|1023-1031|共9页
  • 作者

    Wei Xie; Rohan Stanger; John Lucas; Terry Wall; Merrick Mahoney;

  • 作者单位

    Chemical Engineering, University of Newcastle, Callaghan, NSW 2308, Australia;

    Chemical Engineering, University of Newcastle, Callaghan, NSW 2308, Australia;

    Chemical Engineering, University of Newcastle, Callaghan, NSW 2308, Australia;

    Chemical Engineering, University of Newcastle, Callaghan, NSW 2308, Australia;

    Chemical Engineering, University of Newcastle, Callaghan, NSW 2308, Australia;

  • 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

    maceral separation; reflux classifier; swelling; specific heat; thermal conductivity;

    机译：黄体分离回流分级机肿胀;比热导热系数;

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