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The properties of large coal particles and reaction kinetics of corresponding chars

机译：大煤颗粒的性质及相应炭的反应动力学

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摘要

An investigation was undertaken to determine the distribution of chemical-, petrographic- and mineral-ogical properties of large coal particles of different sizes and densities and to evaluate a suitable reaction rate model for corhbustion of corresponding chars. This was undertaken in order to contribute to the knowledge of the combustion kinetics of large particles in fluidized bed combustion and moving bed combustion/gasification. The study was confined to a mineral rich (24.1 wt%) and inertinite rich (74 wt%) parent coal (precursor) that was separated into different sizes and density fractions. The combustion reactive properties of chars prepared at 1100 ℃ and at a reaction temperature of 1000 ℃ were determined using a horizontal tubular furnace with the associated on-line analysers and temperature controllers. Coal particles in the size range of 0.50-53 mm diameter and density from 1.4 g cm~(-3) to 2.0 g cm~(-3) were studied. The characterisation of the different coal samples consisting of ash content, maceral content, fuel ratios and calorific values showed that the parameters did not vary significantly over the particle size ranges, but were different for the different density fractions. Combustion studies showed that particle size and density influenced the time required for complete conversion of the chars. The smaller particles and low density particles reacted faster and the modeling of the experimental data showed that the isothermal shrinking un-reacted core model with film and ash layer diffusion was applicable. The effective ash layer diffusion becomes more prominent as the density increased and the mass transfer coefficients correlated well with published results.
机译：进行了一项调查，以确定不同尺寸和密度的大煤颗粒的化学，岩石学和矿物学特性分布，并评估了合适的反应速率模型，以燃烧相应的炭。这样做是为了有助于人们了解流化床燃烧和移动床燃烧/气化中大颗粒的燃烧动力学。该研究仅限于富含矿物质（24.1 wt％）和富含惰质石（74 wt％）的母煤（前驱体），它们被分为不同的大小和密度分数。使用卧式管式炉以及相关的在线分析仪和温度控制器，测定在1100℃和1000℃的反应温度下制备的焦炭的燃烧反应性能。研究了直径在0.50-53 mm范围内，密度从1.4 g cm〜（-3）到2.0 g cm〜（-3）的煤颗粒。对不同煤样的灰分，黄石含量，燃料比和热值的表征表明，参数在粒径范围内变化不大，但对于不同的密度分数却有所不同。燃烧研究表明，颗粒大小和密度影响了焦炭完全转化所需的时间。较小的颗粒和低密度的颗粒反应更快，实验数据的建模表明，具有膜和灰层扩散的等温收缩未反应芯模型是适用的。随着密度的增加，有效的灰分扩散变得更加突出，传质系数与已发表的结果很好地相关。

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  • 来源
    《Fuel》 |2015年第15期|17-26|共10页
  • 作者

    R.C. Everson; H.W.J.P. Neomagus; G.W. van der Merwe; A. Koekemoer; J.R. Bunt;

  • 作者单位

    Coal Research Group, Energy Systems, School of Chemical and Minerals Engineering, North-West University, 2520 Potchefstroom, South Africa;

    Coal Research Group, Energy Systems, School of Chemical and Minerals Engineering, North-West University, 2520 Potchefstroom, South Africa;

    Coal Research Group, Energy Systems, School of Chemical and Minerals Engineering, North-West University, 2520 Potchefstroom, South Africa;

    Coal Research Group, Energy Systems, School of Chemical and Minerals Engineering, North-West University, 2520 Potchefstroom, South Africa,Sasol Technology (Pty) Ltd, Box 1, Sasolburg 1947, South Africa;

    Coal Research Group, Energy Systems, School of Chemical and Minerals Engineering, North-West University, 2520 Potchefstroom, South Africa,Sasol Technology (Pty) Ltd, Box 1, Sasolburg 1947, South Africa;

  • 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

    Large coal particles; Particle size; Particle density; Devolatilization; Combustion;

    机译：煤大颗粒;粒度;颗粒密度脱挥发分;燃烧;

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