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Influence of thermoplastic properties on coking pressure generation: Part 1 - A study of single coals of various rank

机译：热塑性对焦化压力产生的影响：第1部分-各种等级的单一煤的研究

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摘要

In this study a number of high coking pressure coals with different fluidities were evaluated alongside a number of low pressure coals also with differing fluidities. This was to confirm findings from an earlier study using a limited selection of coals, and to establish Theological parameters within which a coal may be considered potentially dangerous with regards to coking pressure. The results have confirmed and elaborated on previous findings which show that parallel plate displacement (ΔL) and axial force profiles can be used to distinguish between high and low pressure coals, with peak values indicating cell rupture and subsequent pore network formation. This is thought to correspond with plastic layer compaction in the coke oven.rnFor low pressure coals pore coalescence occurs quite early in the softening process when viscosity/elasticity are decreasing and consequently a large degree of contraction/collapse is observed. For higher pressure coals the process is delayed since pore development and consequently wall thinning progress at a slower rate. If or when a pore network is established, a lower degree of contraction/collapse is observed because the event occurs closer to resolidification, where viscosity and elasticity are increasing. For the higher fluidity, high coking pressure coals, a greater degree of swelling is observed prior to cell rupture, and this is considered to be the primary reason for the high coking pressure observed with these coals. An additional consequence of these events is that high pressure coals are likely to contain a higher proportion of closed cells both at and during resolidification, reducing permeability in both the semi-coke and high temperature plastic layers, respectively.rnUsing a rheological mapping approach to follow viscoelastic changes during carbonisation it has been possible to identify specific regions associated with dangerous coals. These tend to be fusible coals where at the onset of expansion, δ (elasticity) ＜ 54° and η~* (complex viscosity) ＞ 5 × 10~5 Pa s, and where in most cases δ_(MAX) does not exceed 65°.
机译：在这项研究中，评估了许多具有不同流动性的高焦化压力煤以及许多具有不同流动性的低压煤。这是为了确认从早期研究中发现的使用有限选择的煤的发现，并建立了神学参数，在该参数中，煤可能被视为对焦化压力具有潜在危险。该结果已经证实并详细阐述了先前的发现，这些发现表明平行板位移（ΔL）和轴向力曲线可用于区分高压煤和低压煤，峰值表明细胞破裂和随后的孔隙网络形成。认为这与焦炉中的塑料层压实相对应。对于低压煤，在软化过程中，当粘度/弹性降低时，孔隙聚结发生得很早，因此观察到很大程度的收缩/塌陷。对于较高压力的煤，该过程被延迟了，因为孔隙发展并因此以较慢的速度进行了壁变薄。如果或当建立了孔网络时，则观察到较低的收缩/塌陷度，因为该事件更接近于重新固化，粘度和弹性正在增加。对于较高流动性，高焦化压力的煤，在细胞破裂之前观察到更大程度的溶胀，这被认为是这些煤所观察到的高焦化压力的主要原因。这些事件的另一个后果是，高压煤可能在再凝固期间和凝固期间包含较高比例的闭孔，从而分别降低了半焦和高温塑料层的渗透性。碳化过程中的粘弹性变化已经可以确定与危险煤有关的特定区域。这些是易燃煤，在膨胀开始时，δ（弹性）＜54°，η〜*（复数粘度）＞ 5×10〜5 Pa s，并且在大多数情况下δ_（MAX）不超过65 °。

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  • 来源
    《Fuel》 |2010年第7期|p.1590-1599|共10页
  • 作者

    John J. Duffy; Merrick R. Mahoney; Karen M. Steel;

  • 作者单位

    Nottingham Fuel and Energy Centre, School of Chemical and Environmental Engineering, The University of Nottingham, Nottingham NG7 2RD, United Kingdom;

    BHP Billiton Technology, Newcastle Technology Centre P.O. Box 188, Wallsend 2287, Australia;

    rnNottingham Fuel and Energy Centre, School of Chemical and Environmental Engineering, The University of Nottingham, Nottingham NG7 2RD, United Kingdom School of Chemical Engineering, The University of Queensland, St Lucia 4072, 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

    coal; viscoelasticity; coking pressure;

    机译：煤;粘弹性焦化压力;

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