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Kinetics of carbon oxidation from fly ash

机译：粉煤灰碳氧化的动力学

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摘要

Thermal gravimetric analysis (TGA) and evolved gas mass spectroscopy were used to study the kinetics of carbon oxidation from a Class-F fly ash. A multi-process ignition loss schema is presented wherein carbon combustion is modeled as a series or discrete independent reactions. These processes were studied at temperatures up to 1000 ℃ (1832 °F), for oxygen partial pressures between 0.05 and 0.50 and for heating rates between 5 and 40 ℃/min (9-72 °F/min). The results show that carbon combustion can be modeled by a series of at least three processes; the weights (fractions) of which are a function of temperature and not a function of oxygen partial pressure. Such detailed combustion kinetics are relevant for the post processing of fly ash to produce materials suitable for use as concrete admixtures or in the manufacture of sintered artificial aggregate or similar densified structures based on fly ash. Such are low temperature, low heating rate processes relative to coal combustion power generation applications.
机译：使用热重分析（TGA）和演化气体质谱法研究了F级粉煤灰碳氧化的动力学。提出了一种多过程着火损失方案，其中碳燃烧被建模为一系列或离散的独立反应。在高达1000℃（1832°F）的温度，氧气分压在0.05至0.50和加热速率在5至40℃/ min（9-72°F / min）的条件下研究了这些过程。结果表明，碳燃烧可以通过至少三个过程的一系列过程进行建模。其重量（分数）是温度的函数，而不是氧分压的函数。这种详细的燃烧动力学与粉煤灰的后处理有关，以生产适合用作混凝土外加剂的材料，或用于制造烧结的人工骨料或基于粉煤灰的类似致密结构。相对于煤燃烧发电应用，这是低温，低升温速率的过程。

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  • 来源
    《Fuel》 |2010年第5期|p.1077-1086|共10页
  • 作者

    Joseph J. Biernacki; Narendar R. Mogulla; Jennifer Bollig; Martin Bijou;

  • 作者单位

    Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN 38505, United States;

    Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN 38505, United States;

    Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN 38505, United States;

    Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN 38505, United States;

  • 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

    combustion; modeling; loss on ignition; LOI; class-F;

    机译：燃烧;造型;灼烧损失;意向书F级;

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