用排列法测定煤的标准分类

详细信息   

• 标准号：ASTM D388-2012
• 发布日期：2012
• 英文题名：Standard Classification of Coals by Rank
• 英文主题词：anthracite ; bituminous ; coal ; lignite ; rank ; Classification (standards) ; Coal products ; Coal sampling systems ; Lignite ; Rank ; Sub-bituminous coal
• 标准状态：现行
• 发布单位：US-ASTM
• 国际标准分类号：75.160.10 (Solid fuels)
• 载体形态：7P.;A4
• 中国标准分类号：D21
• 国别：美国材料与试验协会

文摘

This classification establishes categories of coal based on gradational properties that depend principally on the degree of metamorphism to which the coal was subjected while buried. These categories indicate ranges of physical and chemical characteristics that are useful in making broad estimates of the behavior of coal in mining, preparation, and use.

1.1 This standard covers the classification of coals by rank, that is, according to their degree of metamorphism, or progressive alteration, in the natural series from lignite to anthracite.

1.2 This classification is applicable to coals that are composed mainly of vitrinite.

Note 18212;Coals rich in inertinite or liptinite (exinite), or both, cannot be properly classified because, in those macerals, the properties that determine rank (calorific value, volatile matter, and agglomerating character) differ greatly from those of vitrinite in the same coal. Often such coals can be recognized by megascopic examination. In North America, these coals are mostly nonbanded varieties that contain only a small proportion of vitrain and consist mainly of attrital materials. The degree of metamorphism of nonbanded and other vitrinite-poor coals can be estimated by determining the classification properties of isolated or concentrated vitrinite fractions, or by determining the reflectance of the vitrinite (see Test Method lidateSubscription.cgi?D2798-HTML">D2798 and Appendix X1 of this classification). However, in the use of these vitrinite-poor coals, some properties normally associated with rank, such as rheology, combustibility, hardness, and grindability (as well as the rank determining properties) may differ substantially from those of vitrinite-rich coals of the same degree of metamorphism.

The precision of the classification of impure coal may be impaired by the effect of large amounts of mineral matter on the determination of volatile matter and calorific value, and on their calculation to the mineral-matter-free basis.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3.1 lic">lic">Exception8212;The values stated in British thermal units per pound are to be regarded as the standard. The SI equivalents of British thermal units per pound are approximate.