By John Seidle
Writer John Seidle has written this much-needed advent to a different unconventional gasoline source for college students and training engineers in addition to a easy guide when you are eager about coalbed methane every day and require effortless, functional solutions within the fast moving enterprise global
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Example text
Macerals are to coal as minerals are to sandstone. 33 Maceral names always have the suffix -inite. Vitrinite macerals, with a name derived from their glassy appearance under a microscope, are derived from the woody, cellulosic tissues of plants preserved in reducing environments, often abruptly sealed from the atmosphere. Thermally immature vitrinite macerals found in lignites are termed humitites. 34 Liptinite macerals, also termed exinites, are formed from the spores, cuticles, and resins of plants.
2–3. Coal porosity distributions vs. rank58 The effect of maceral type on coal porosity was partially addressed by Gan et al. 59 As seen in figure 2–4, total coal porosity is roughly proportional to the volume percent vitrinite, but the significant scatter indicates a secondary control, probably mineral matter. 60 Water porosity of bituminous coals varied with rank, declining from a maximum of 22% in coals with 81% carbon on a dry, mineral-matter-free basis (high-volatile bituminous) to a minimum of 2% at 90% carbon (low-volatile bituminous), then rebounding to 6% at 95% carbon (anthracite).
Indd 18 8/25/11 2:02 PM Coal Fundamentals 2 Introduction Coal fueled the Industrial Revolution of Europe in the 18th and 19th centuries and continues to be an important source of energy throughout the world today. Scientific studies of coal have therefore focused on mineability of this resource and its combustion, chemical, and metallurgical characteristics. Much of that information is relevant for understanding coal deposits as gas reservoirs. Fundamental aspects utilized for reservoir engineering purposes include coal rank, proximate and ultimate analyses, macerals, porosity, density, rock mechanics, sorption behavior, and gas properties.