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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.

Contents

1 Properties 2 Reserves 3 Current use 4 See also 5 References

Properties[edit] 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).[1] 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. Reserves[edit] A major source of sub-bituminous coal in the United States is the Powder River Basin
Powder River Basin
in Wyoming. Current use[edit] Sub-bituminous coals, in the United States, typically have a sulfur content less than 1% by weight, which makes them an attractive choice for power plants to reduce SO2 emissions under the Acid Rain Program. See also[edit]

Types of Coal List of CO2 emitted per million Btu of energy from various fuels

References[edit]

^ The Babcock & Wilcox Company. Steam: its generation and use. The Babcock & Wilcox Company. pp. 36–5. ISBN 0-9634570-1-2. 

v t e

Coal

Coal
Coal
types by grade (lowest to highest)

Xylit Peat1 Lignite Sub-bituminous coal Bituminous coal Anthracite Graphite1

Coal
Coal
combustion

Black coal equivalent Char Coal
Coal
pollution mitigation Coal
Coal
preparation plant Coal
Coal
seam fire Coke Coal
Coal
tar Energy value Flue gas Fly ash

Coal
Coal
mining

Coalfields Coal
Coal
dust Coal
Coal
gas Coal
Coal
slurry Coal
Coal
homogenization Coal
Coal
liquefaction Environmental impact of the coal industry History Mining regions Peak coal Refined coal Coal
Coal
town

Note: [1] Peat
Peat
is considered a precursor to coal. Graphite
Graphite
is only technically consi

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