Coal is generally produced from dead and decaying plant matter. It is found beneath the earth’s surface. Under the earth’s surface, they have been subject to heat and pressure for ages. It is made up of carbon, as well as some other elements, mainly hydrogen, with smaller quantities of oxygen, Sulphur, and nitrogen. Older coal usually has higher carbon content, while the younger coals have lower carbon and greasy content with dirtier fuel and high moisture.
Here are described the various types of coal regularly used by humans:
Peat
Peat is a precursor of coal made from decaying vegetation. It is basically a vital industrial fuel, especially in some specific regions. Peat becomes an efficient absorbent for fuel, and oil spills on both water and land when it is dehydrated.
Lignite
Lignite is also referred to as brown coal. It is basically made from compressed peat. It is low-ranking and extremely volatile coal that has applications found in power stations.
Bituminous
Bituminous coal is made from compressed lignite. This coal type is a dense, sedimentary rock that is generally black in color but can also be dark brown. Bituminous coals are commonly used in the production of briquettes, as well as power stations. Moreover, they also have applications related to heat and power. They are used to make coke as well.
Steam Coal
Steam coal mined by the exporter of Indonesian steam coal is basically the stepping stone between bituminous coal and anthracite. It is mostly employed to generate electricity.
Anthracite
Anthracite is the upper-most rank of ignitable coal. It is sturdier, black, and glossy, and as natural smokeless petroleum, it is used mainly for commercial and residential space heating. It is the main source of many manufactured fuels and offers a good heat output and long burning times.
Graphite
Graphite is typically the highest-ranking coal. It may be difficult to ignite and is rarely used as a fuel. It is mainly used to make pencils and is also employed as a lubricant in its powdered form.
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