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Solvent swelling behavior of Permian-aged South African vitrinite-rich and inertinite-rich coals

机译：二叠纪年龄的南非富含镜质岩和富含惰质岩的煤的溶剂溶胀行为

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摘要

Two South African coals similar in rank and age, but different in maceral composition, were studied using solvent swelling. Inertinite-rich Highveld coal (dominated by semifusinite) and vitrinite-rich Waterberg coal were evaluated for swelling extent and swelling rate using N-methyipyrrolidone (NMP) and CS_2/ NMP. A stop-motion videography method was developed to study individual particle swelling behavior. This method allowed observation of overshoot and climbing-type swelling, as well as swelling kinetics. Single-particle swelling experiments showed that both coals exhibited overshoot-type and climbing-type swelling. The inertinite-rich coal swelled much faster (in both solvents) than the vitrinite-rich coal. The swelling in CS_2/NMP was faster for both coals. Kinetic parameters showed that solvent swelling was governed by relaxation (super-Case II relaxation) of the coal structure. X-ray computed tomography was conducted over a 50 h swelling period in NMP for single particles of each coal. Anisotropic swelling was observed in all the particles (swelling greater perpendicular to the bedding plane than parallel to it). The subtle changes in molecular structure, fine structural and physical differences resulted in significant differences in solvent swelling behavior.
机译：使用溶剂溶胀研究了两种南非煤，其等级和年龄相似，但组成成分不同。使用N-甲基吡咯烷酮（NMP）和CS_2 / NMP评估了富含惰性的Highveld煤（由半次纤铁矿为主）和富含镜质的Waterberg煤的溶胀程度和溶胀速率。开发了定格摄影方法来研究单个颗粒的溶胀行为。这种方法可以观察到过冲和爬升型膨胀以及膨胀动力学。单颗粒膨胀实验表明，两种煤均表现出过冲型和爬升型膨胀。富惰质煤（在两种溶剂中）溶胀比富钙质煤快得多。两种煤的CS_2 / NMP膨胀都更快。动力学参数表明，溶剂膨胀受煤结构的弛豫（super-Case II弛豫）控制。对于每种煤的单个颗粒，在NMP中经过50小时的溶胀时间进行X射线计算机断层扫描。在所有颗粒中均观察到各向异性膨胀（垂直于顺层平面的膨胀大于平行于顺层平面的膨胀）。分子结构的细微变化，精细的结构和物理差异导致溶剂溶胀行为的显着差异。

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  • 来源
    《Fuel》 |2010年第1期|19-25|共7页
  • 作者

    Daniel Van Niekerk; Phillip M. Halleck; Jonathan P. Mathews;

  • 作者单位

    Energy and Mineral Engineering and the EMS Energy Institute, Pennsylvania State University, 157 Hosier Building, University Park, PA 16802, USA;

    Energy and Mineral Engineering and the EMS Energy Institute, Pennsylvania State University, 157 Hosier Building, University Park, PA 16802, USA;

    Energy and Mineral Engineering and the EMS Energy Institute, Pennsylvania State University, 157 Hosier Building, University Park, PA 16802, USA;

  • 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

    macerals; south african coal; solvent swelling; vitrinite; inertinite;

    机译：黄石南非煤炭;溶剂溶胀;镜质体惰质;

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