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

Bituminous coal
A dense coal, usually black, sometimes brownish, 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 also to make coke. Its moisture content articles are usually less than 20%. The temperature content of this coal varies from 19 to 27 Mn Btu per t over a moist, mineral-matter-free basis.

Sub-bituminous coal
A coal whose properties vary from those of lignite to those of this coal type, it's used primarily as fuel for steam-electric power generation. It can 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 heat content of sub-bituminous coal varies from 15 to 22 Mn Btu per t with a moist, mineral-matter-free basis.Firewood Birmingham

Lignite Coal
Lignite could be the lowest rank of coal, known as brown coal which is used almost exclusively as fuel for steam- electrical energy 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 on the moist, mineral-matter-free basis.Steam coal
Steam coal will be the total of anthracite and bituminous coal.
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