OEO Ontology

Overview / Open Energy Ontology / Class - hard coal
Label: hard coal
Definition:
Hard coal is coal with a gross calorific value greater than 23 865 kJ/kg (5 700 kcal/kg) on an ashfree but moist basis and with a mean random reflectance of vitrinite of at least 0,6.

Sub classes:
anthracite
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Definition:
Anthracite is a hard coal with a high caloric value due to its high carbon content (about 90 % fixed carbon).

coking coal
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Definition:
Coking coal is hard coal that is bituminous with a quality that allows the production of a coke suitable to support a blast furnace charge. Its gross calorific value is greater than 23 865 kJ/kg (5 700 kcal/kg) on an ash-free but moist basis.

Back to the super classes:
coal
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Definition:
Coal is a portion of matter consisting of combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams.