Critical Condition for the Particle Combustion of Carbon Activated in a Hot, Quiescent Environment: Comparisons with Experimental Results
Critical Condition for the Particle Combustion of Carbon Activated in a Hot, Quiescent Environment: Comparisons with Experimental Results
复制标题
热静止环境中活性炭颗粒燃烧的临界条件：与实验结果的比较
DOI：
10.1080/00102202.2016.1264943
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发表时间：
2017
影响因子：
1.9
通讯作者：
A. Makino
中科院分区：
文献类型：
--
作者：
A. Makino
在以前的工作中得到的与固体燃料颗粒的活化有关的临界条件的适当性和/或有用性，已通过使用文献中报道的在静止环境中燃尽的实验数据进行比较而得到进一步的检验。在确定了评价燃烧速率所必需的表面反应动力学参数后，所用的各种含碳固体燃料的结果是从无烟煤到低阶煤焦以及石油焦的结果。报告的颗粒尺寸为25 μm至4 mm;环境温度高于1300 K。利用由表面C-O_2反应频率因子、颗粒直径、氧质量分数和压力比组成的扩展综合参数的Arrhenius图，其上半部分由临界条件隔开，对应于表面反应被激活的颗粒燃尽参数。就趋势和大致量级而言，一般来说，已经证明了相当程度的一致性，这表明所使用的公式已经抓住了粒子燃烧的基本特征，其他人还没有对此进行说明。此外，已经再次证实，颗粒尺寸的减小不一定有利于颗粒燃烧，并且当颗粒尺寸减小到临界尺寸以下时，表面反应停止被激活。
ABSTRACT Appropriateness and/or usefulness of the critical condition, being derived in a previous work related to the activation of solid fuel particles, have further been examined by conducting comparisons by use of such experimental data in the literature as are reported to burn-out in a quiescent environment. Results of various carbonaceous solid fuels used are those from anthracite to low-rank coal char, as well as petroleum coke, after confirming kinetic parameters for the surface reaction that are indispensable in evaluating combustion rate. Particle sizes reported are those from 25 μm to 4 mm; ambient temperatures are those higher than 1300 K. Use has been made of the Arrhenius plot of the extended comprehensive parameter consisting of frequency factor of the surface C–O2 reaction, particle diameter, oxygen mass-fraction, and pressure ratio, the upper half of which, separated by the critical condition, corresponds to that for particle burn-out with the surface reaction activated. As far as the trend and approximate magnitude are concerned, a fair degree of agreement has been demonstrated, in general, suggesting that the formulation used has captured the essential feature of the particle combustion, elucidation of which has not been made by the others. In addition, once again, it has been confirmed that the reduction in particle size does not necessarily favor the particle combustion, and that the surface reaction ceases to be activated when the particle size is reduced below the critical one.