Different Coal Rank and Uses

Anthracite Coal
Anthracite may be the highest rank of coal, used primarily for commercial and residential space heating. This is a hard, brittle, and black lustrous coal, known as hard coal, containing a high percentage of fixed carbon as well as a low percentage of volatile matter. The moisture content of fresh-mined anthracite usually less than 15%. The heat content of anthracite varies from 20 to 25 Mn Btu per t on a moist, mineral-matter-free basis. Since the 1980's, anthracite refuse or mine waste was used for steam electrical power generation. This fuel typically includes a heat content of 13.5 Mn Btu per t or fewer.- Coal Merchants West Midlands

Bituminous coal
A dense coal, usually black, sometimes brown leafy, often with well-defined bands of bright and dull material, it really is used primarily as fuel in steam-electric power generation, with substantial quantities also useful for heat and power applications in manufacturing and also to make coke. Its moisture content is usually less than 20%. The warmth content of this coal ranges from 19 to 27 Mn Btu per t on the moist, mineral-matter-free basis.- Firewood Birmingham

Sub-bituminous coal
A coal whose properties cover anything from those of lignite to those of the coal type, it can be used primarily as fuel for steam-electric power generation. It may be dull, dark brown to black, soft and crumbly, with the lower end of the range, to bright, jet black, hard, and comparatively strong, at the upper end. Sub-bituminous coal contains 20-30% inherent moisture by weight. The warmth content of sub-bituminous coal ranges from 15 to 22 Mn Btu per t on the moist, mineral-matter-free basis.

Lignite Coal
Lignite may be the lowest rank of coal, known as brown coal and it's also used almost exclusively as fuel for steam- electric power generation. It is brownish-black and contains a high inherent moisture content, sometimes as high as 45% The heat content of lignite ranges from 8 to 15.5 Mn Btu per t with a moist, mineral-matter-free basis.Steam coal
Steam coal is the total of anthracite and bituminous coal.

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