Sub-bituminous coal is a type of coal whose properties range from those of lignite to those of bituminous coal and are used primarily as fuel for steam-electric power generation.
1 Properties 2 Reserves 3 Current use 4 See also 5 References
Sub-bituminous coals may be dull, dark brown to black, soft and
crumbly at the lower end of the range, to bright jet-black, hard, and
relatively strong at the upper end. They contain 15-30% inherent
moisture by weight and are non-coking (undergo little swelling upon
heating). The heat content of sub-bituminous coals range from 8300
to 11,500 BTu/lb or 19.3 to 26.7 MJ/kg. Their relatively low density
and high water content renders some types of sub-bituminous coals
susceptible to spontaneous combustion if not packed densely during
storage in order to exclude free air flow.
A major source of sub-bituminous coal in the United States is the
Powder River Basin
Types of Coal List of CO2 emitted per million Btu of energy from various fuels
^ The Babcock & Wilcox Company. Steam: its generation and use. The Babcock & Wilcox Company. pp. 36–5. ISBN 0-9634570-1-2.
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Xylit Peat1 Lignite Sub-bituminous coal Bituminous coal Anthracite Graphite1