describe the tree type of coal
Answers
Answer:
Explanation:
Coal is a fossil fuel which is formed by the decomposition and degradation of plant, vegetation and animal life over a period of million of years under the pressure of earth. The energy which we get after burning of these fossil fuels is the same energy that was absorbed by them from the sun.
There are many types of coal, including anthracite, bituminous, subbituminous, and lignite.
Anthracite is the highest ranked, hardest, oldest, and least common type of coal. It possesses a high energy content, high percentage of carbon (>85%) and relatively little moisture or volatiles. Anthracite produces nearly 15,000 Btu's per pound.
Bituminous is the second rank of coal, softer and younger than anthracite, and containing a lower percentage of carbon (45-85%) and therefore more moisture and volatiles.
Bituminous coal is primarily used to generate electricity and to make coke for the steel industry. It has a heat value of 10,500 to 15,500 Btu's per pound.
Subbituminous coal ranks just below bituminous coal with 35 to 45 percent carbon content. The heat value of subbituminous coal is between 8,300 and 13,000 Btu's per pound.
Lignite has the softest, youngest, and wettest rank of coal with a carbon content of only 25-35%. The heat value of lignite ranges between 4,000 and 8,300 Btu's per pound. Sometimes lignite is known as brown coal because of its brown color.
Answer:
The four types of coal are peat, lignite, bituminous, and anthracite. Peat is often not listed as a type of coal since the use of it as an energy source is limited today. However, it's still a type of coal and can be used as an energy source.
Peat is the first step in coal formation. Peat is composed of over 60% organic matter; typically, ferns and vegetation found in swamps or bogs. As a result of the high water content of this environment, peat contains a lot of water, which limits its heat content or the amount of energy it contains. It's a very soft brown coal.
- Eventually over time, with increasing pressures and temperatures, peat is 'cooked' into coal's next stage, lignite.
Lignite is a soft brown coal that still contains a high amount of water. Lignite has a higher heat content than peat but is still not the most desired form of coal. However, lignite makes up almost half of our known coal reserves.
Bituminous coal is formed as more pressure is applied to lignite coal. The greater the pressure applied, the more water is expelled, which increases the amount of pure carbon present and increases the heat content of the coal. Bituminous coal is often classified as sub-bituminous or bituminous. The difference is that sub-bituminous is the transition stage from lignite to bituminous coal. Bituminous coal is widely used in the United States and across Europe.
Anthracite coal is a metamorphic rock and is considered the highest grade coal. It's hard and dark black in color. It has a very light weight when compared to other forms of coal, as there is very little water present in anthracite. As a result, anthracite has the highest heat content. Anthracite is formed when bituminous coal is subjected to great pressures, such as those associated with the folding of rock during the creation of mountain ranges.
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