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The estimation of char reactivity from coal reflectogram

机译：由煤反射图估算焦炭反应性

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Measurements of the intrinsic reactivity of chars to oxygen are increasingly being sought as an indicator of the combustion potential of fuels. The coal reflectogram has been used to characterize the chemical properties of coal and its resultant char structure. In this study, six Australian coals varying in rank were separated using density separation technique to obtain vitrinite and inertinite rich fractions. Chars were obtained from these density fraction samples in a Drop Tube Furnace (DTP) at 1673 K. The reactivity of the chars was measured non-isothermally in a Thermal Gravimetric Analysis (TGA) in the temperature range of 573-1073 K. The results suggested that with the increase in the coal rank, the maximum reactivity of chars derived from vitrinite rich fractions decreases, while the reactivity of chars derived from inertinite rich fractions decreases with the increase in the inertinite content in samples and has no obvious relationship with rank. The kinetic parameters were derived using data from non-isothermal TGA after accounting for changing in surface area with conversion. The frequency factor is found to decrease with increasing coal FMR, defined as the summation of each reflectance value multiplied by its frequency, for a constant activation energy (E=146 kJ/mol). This suggests that the behavior of a maceral is characterized primarily by its reflectance distribution instead of the type of its parent coal.
机译：越来越多地寻求对碳与氧的固有反应性进行测量，以作为燃料燃烧潜力的指标。煤反射图已用于表征煤的化学性质及其生成的炭结构。在这项研究中，使用密度分离技术分离了六种等级不同的澳大利亚煤，以获得富含镜质体和惰质体的馏分。在1673 K的下降管式炉（DTP）中从这些密度分数样品中获得炭。在热重分析（TGA）中在573-1073 K的温度范围内以非等温方式测量炭的反应性。结果认为随着煤阶数的增加，富含镜质石馏分的焦炭的最大反应性降低，而富含惰质石馏分的焦炭的反应性随着样品中惰质石含量的增加而降低，并且与煤级没有明显的关系。在考虑了表面积随转化率的变化之后，使用来自非等温TGA的数据得出动力学参数。对于恒定的活化能（E = 146 kJ / mol），发现频率因数随煤FMR的增加而降低，煤FMR定义为每个反射率值之和乘以其频率。这表明，黄斑的行为主要由其反射率分布而不是其母煤的类型来表征。

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