文章摘要信息 关键词 ： 煤层气；不同煤阶；煤储层；应力敏感性；渗透率 [gap=1513]Keywords : coalbed methane；different coal rank；coal reservoir；stress sensitivity；permeability
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The effect of feed coal particle size on strength of briquette is discussed when different briquetting process and rank of coalification coal are adopted.
阐述了采用不同成型工艺和使用不同变质程度煤成型时，原料煤粒度对型煤强度的影响。
Coal maceral concentrates of high purity were prepared from four different rank coals by Density Gradient Centrifugation method.
经等密度梯度离心分离，从褐煤、长焰煤、气煤和贫煤四种不同变质程度煤中获得了高纯度的有机显微组分。
The results(indicated) that the approximate analysis of the pulverized coal changed to different degrees, and the particle size distribution mainly depended on the coal rank but not the HGI.
试验结果表明，经过哈氏可磨性测定仪后，各煤种的工业分析都发生了不同程度的变化，而煤粉破碎后的粒度分布取决于煤种的煤化程度，而与煤种的可磨性指数相关性较小。
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