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Theoretical oxygen requirement for coal combustion: relationship with its calorific value

机译：煤燃烧的理论需氧量：与热值的关系

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The general relationship between heat of combustion (Q) of fuel and the theoretical oxygen requirement (Or) for complete combustion is well known. A revaluation of such a relation in the case of coal has yielded a novel and more accurate correlation. Graphical studies revealed a three-phase relationship between Q and Or, from brown coal/lignite to anthracite in the normal path of coalification, each of which has been found to be remarkably linear in their respective regimes, marked by two turning points, one at about 84 and the other at 92 wt/100 carbon. A similar curve observed for atomic H/C' ratio vs rank was claimed to truly represent the genetic path of coal. Interpolation of the two relationships, aided by previous interpretation of structural changes of coal across its genetic path in terms of changes in H/C ratio, has led to the following correlation: f Q (MJ/kg) = l3.03 X Or, + 0.93 + l.98(H/C' -- 0.80), which is uniformly applicable to all coals, irrespective of rank (C: 65--97 wt/100) or petrographic composition. A derivative of the correlation giving the calorific value directly on the dry basis has also been developed: Qd = l3.03 X Ord + (l00 -- MM) X (0.238Hd/Cd -- 0.0065) -- 0.007 ash, using the weight ratio of hydrogen to carbon instead of the atomic ratio. Its accuracy has been found to be one of the best amongst all 'ultimate' formulae, (SD 0.16 MJ/kg on dry basis). The success of the new-found correlation is ascribed to the H/C term, the role and function of which are brought out in full.
机译：燃料的燃烧热（Q）和完全燃烧的理论氧需求（Or）之间的一般关系是众所周知的。在煤的情况下，对这种关系的重新评估产生了新颖且更准确的相关性。图形研究表明，正常煤化过程中，从褐煤/褐煤到无烟煤，Q和Or之间存在三相关系，发现每种状态在各自的状态下均呈线性关系，以两个转折点为标志，一个转折点为大约84，另外一个在92 wt / 100碳。据称观察到的类似的H / C'原子比与等级的关系曲线真实地代表了煤的遗传路径。通过先前对煤沿H / C比变化的遗传路径对结构变化的解释的辅助，对这两个关系进行插值，得出以下相关关系：f Q（MJ / kg）= l3.03 X或， + 0.93 + 1.98（H / C'-0.80），无论等级（C：65--97 wt / 100）或岩石学组成如何，均适用于所有煤。还开发了一种相关性的导数，它直接给出了干基的热值：Qd = l3.03 X Ord +（l00-MM）X（0.238Hd / Cd-0.0065）-0.007灰分，使用氢与碳的重量比，而不是原子比。在所有“最终”配方中，其精度都是最高的（以干基计，SD为0.16 MJ / kg）。新发现的关联的成功归因于H / C术语，其作用和功能得到了充分发挥。

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