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Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. [1] Coal is a type of fossil fuel, formed when dead plant matter decays into peat which is converted into coal by the heat and pressure of deep burial over millions of years. [2]
The Allegheny Group, often termed the Allegheny Formation, [2] is a Pennsylvanian-age geological unit in the Appalachian Plateau. It is a major coal -bearing unit in the eastern United States , extending through western and central Pennsylvania , western Maryland and West Virginia , and southeastern Ohio .
In industrial chemistry, coal gasification is the process of producing syngas—a mixture consisting primarily of carbon monoxide (CO), hydrogen (H 2), carbon dioxide (CO 2), methane (CH 4), and water vapour (H 2 O)—from coal and water, air and/or oxygen. Historically, coal was gasified to produce coal gas, also known as "town gas
This category contains the geologic formations with a coal lithology. Pages in category "Coal formations" The following 83 pages are in this category, out of 83 total.
The Gething Formation contains coal seams that range from thin laminae to as much as 4.3 meters (14 ft) thick. Coal rank ranges from low- to high-volatile bituminous, and the coal has good coking properties except where oxidized. [4] It has been mined by underground methods near the Peace River west of Hudson's Hope and near the Sukunka River.
The term coal measures has also historically been used in other parts of the world for coal-bearing successions of various ages, e.g. the Permian coal measures of Australia and the late Cretaceous and early Tertiary coal measures found in New Zealand. However, these usages are mostly informal.
The upper part of the roadcut is Hyden Formation, consisting of mixed siliciclastics and coal. The lower part is Pikeville Formation, also having mixed siliciclastics and coal. Coal forms when organic matter builds up in waterlogged, anoxic swamps, known as peat mires, and is then buried, compressing the peat into coal. The majority of Earth's ...
Underground coal gasification converts coal to gas while still in the coal seam (in-situ). Gas is produced and extracted through wells drilled into the unmined coal seam. Injection wells are used to supply the oxidants (air, oxygen) and steam to ignite and fuel the underground combustion process. Separate production wells are used to bring the ...