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Smokeless fuels generally have a high calorific value, with that of anthracite being greater than dry wood for example, and many smokeless briquettes are made from this type of coal. Thus anthracite has a calorific value of 32.5 MJ/kg compared with that of dry wood of about 21 MJ/kg.
Lignite mining, western North Dakota, US (c. 1945). Lignite is brownish-black in color and has a carbon content of 60–70 percent on a dry ash-free basis. However, its inherent moisture content is sometimes as high as 75 percent [1] and its ash content ranges from 6–19 percent, compared with 6–12 percent for bituminous coal. [5]
Bituminous coal, or black coal, is a type of coal containing a tar-like substance called bitumen or asphalt. Its coloration can be black or sometimes dark brown; often there are well-defined bands of bright and dull material within the seams. It is typically hard but friable. Its quality is ranked higher than lignite and sub-bituminous coal ...
Coal-upgrading technology refers to a class of technologies developed to remove moisture, and certain pollutants from low rank coals such as sub-bituminous coal and lignite and raise their calorific values. Companies in Australia, Germany, and the United States are the principal drivers of this research, development, and commercialization.
In many areas, wood is the most easily available form of fuel, requiring no tools in the case of picking up dead wood, or few tools. Today, burning of wood is the largest use of energy derived from a solid fuel biomass. Wood fuel can be used for cooking and heating, and occasionally for fueling steam engines and steam turbines that generate ...
An American rancher holding a lump of sub-bituminous coal. Sub-bituminous coal is a lower grade of coal that contains 35–45% carbon. The properties of this type are between those of lignite, the lowest grade of coal, and those of bituminous coal, the second-highest grade of coal. [1] Sub-bituminous coal is primarily used as a fuel for steam ...
Bituminite is the main source for low-temperature coal tar, which is used in industry, medicine and construction [citation needed]. The value of bituminite increases with grade. At high grade, i.e. high maturity, bituminite has high hydrogen to carbon content [citation needed]. A high hydrogen/carbon ratio bituminite indicates a good ...
Soft coal may refer to several lower quality types of coal, primarily used for power generation: Lignite, or brown coal; Sub-bituminous coal; Bituminous coal, ...
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