Experimentation for char combustion kinetics measurements: Bias from char preparation
Experimentation for char combustion kinetics measurements: Bias from char preparation
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DOI：
10.1016/j.fuproc.2016.05.005
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发表时间：
2016-10
影响因子：
7.5
通讯作者：
N. Vorobiev;M. Geier;M. Schiemann;V. Scherer
中科院分区：
文献类型：
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作者：
N. Vorobiev;M. Geier;M. Schiemann;V. Scherer
作为直接用于焦炭燃尽动力学实验的替代方案，煤和其他固体燃料可以在单独的步骤中脱挥发分并转化为焦炭，以消除挥发物释放和燃烧对测量的焦炭转化特性的影响。在这项研究中，研究了焦炭制备条件对煤粉燃烧过程中焦炭燃尽特性的影响。在燃烧驱动的气流床反应器中测试了哥伦比亚高挥发性烟煤的未经处理颗粒以及在三个不同反应器中外部生产的三种煤炭炭。炭的反应性被量化为常用的单膜燃尽模型的指前因子，该模型是根据光学测量的温度和单个燃烧颗粒的尺寸来估计的。结果表明，在加热速率大于 2 × 104K/s 的情况下脱挥发分生成炭可产生适合炭消耗动力学实验研究的材料。高加热速率生产方法的特征似乎仅在消耗过程的早期阶段影响炭反应性（初始炭质量的转化率低于 20-25%）。
As an alternative to direct use in char burnout kinetics experiments, coal and other solid fuels may be devolatilized and converted to char in a separate step in order to eliminate the influence of volatile release and combustion on measured char conversion properties. In this study, the effects of char preparation conditions on char burnout characteristics during pulverized coal combustion are investigated. Untreated particles of a Colombian high-volatile bituminous coal as well as three chars from that coal, which were externally produced in three different reactors, were tested in a combustion-driven entrained flow reactor. The reactivities of the chars were quantified as pre-exponential factors for commonly employed single-film burnout models, which were estimated from optically measured temperatures and sizes of individual burning particles. The results indicate that char production with devolatilization under heating rates greater than 2 × 104K/s yields suitable materials for experimental research on char consumption kinetics. The characteristics of high-heating-rate production methods appear to affect char reactivities only in the early stages of the consumption process (less than 20–25% conversion of the initial char mass).