ABSTRACT

Dried coal typically had certain Particle Size Distribution (PSD) resulting from the size reduction process. Effect of PSD to the compaction phenomenon was investigated on the binary mixtures of Indonesian middle-rank coal with different mass fraction of small and large particles (%L). Compacted density of each coal mixtures was measured during uniaxial briquetting process and their compaction characteristics were analyzed with Cooper-Eaton model. It was found that Cooper-Eaton model could fit excellently (R² > 0.99) with the experimental data. Analysis of compaction characteristics of the model (A_i and k_i) and briquette density revealed that mixtures 0%L (PSD Small) and 100%L (PSD Large) were easier to compact compared to binary mixtures. Binary mixture 70%L was hardest to compact, evaluating from its lowest increase of density, from 893 to 1492 kg/m³. Relatively high coordination number at pressure 2 kPa on mixture 70%L (7.81 ± 0.20) might be the reason for high deformation difficulty. It was concluded that binary mixture of coal with the highest bulk density would results in briquette with the lowest density.

摘要

干煤通常具有一定的粒度分布（PSD），这是由尺寸减小过程产生的。研究了PSD对不同大小颗粒质量分数(%L)的印尼中阶煤二元混合物的压实现象的影响。在单轴压块过程中测量了每种煤混合物的压实密度，并用Cooper-Eaton模型分析了它们的压实特性。发现Cooper-Eaton模型与实验数据能够很好地拟合（ R ^{2 > 0.99）。} 模型压实特性分析（A _i和k _i) 和型煤密度表明，与二元混合物相比，混合物 0%L（PSD 小）和 100%L（PSD 大）更容易压实。二元混合物 70%L 最难压实，从其最低的密度增加评估，从 893 到 1492 kg/m ³。混合物 70%L (7.81 ± 0.20) 在压力 2 kPa 下相对较高的配位数可能是高变形难度的原因。得出的结论是，具有最高堆积密度的煤的二元混合物将产生具有最低密度的型煤。