Coal

Coal

Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.

Industry: Energy

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Coal

Coal sulphur

Energy; Coal

Coal sulphur occurs in three forms: organic, sulfate, and pyritic. Organic sulphur is an integral part of the coal matrix and cannot be removed by conventional physical separation. sulphate sulphur ...

District chilled water

Energy; Coal

Chilled water from an outside source used as an energy source for cooling in a building. The water is chilled in a central plant and piped into the building. Chilled water may be purchased from a ...

Coal liquefaction

Energy; Coal

A chemical process that converts coal into clean-burning liquid hydrocarbons, such as synthetic crude oil and methanol.

District heat

Energy; Coal

Steam or hot water from an outsidesource used as an energy source in a building The steam or hot water is produced in a central plant and piped into the building. The district heat may be purchased ...

Coal mining productivity

Energy; Coal

Coal mining productivity is calculated by dividing total coal production by the total direct labour hours worked by all mine employees.

Diversity

Energy; Coal

The electric utility system's load is madeup of many individual loads that make demands upon the system usually at different times of the day. The individual loads within the customer classes follow ...

Coal preparation

Energy; Coal

The process of sizing and cleaning coal to meet market specifications by removing impurities such as rock, sulfur, etc. It may include crushing, screening, or mechanical cleaning.