Quick Answer: What are the four types of coal write main characteristics of each?

What are 4 types of coal?

Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.

What are 4 different types of coal that are used by humans?

There are four main coal types: lignite, subbituminous, bituminous and anthracite.

What are the 4 types of coal and their carbon content?

Coal types

Coal Dry, Carbon content (%) Dry, volatile content (%)
Anthracite 86-92 3-14
Bituminous coal 76-86 14-46
Sub-Bituminous coal 70-76 42-53
Lignite 65-70 53-63

What are the characteristics of good quality of coal?

Good burning characteristics – Complete combustion without agitation. Good grindability – sometimes it is needed to grind coal before burning. Good coal should not cause high abrasion on the machine. High ash softening temperature – High Ash softening temperature lower the risk of slagging.

What is the formula of coal?

The chemical formula of coal is reported as: C135H96O9NS. Coal is usually taken as 85% carbon based on dry mass.

What is the most common type of coal?

Subbituminous coal accounts for about 37 percent of the coal reserves in the United States. Sometimes called “soft coal” it is the most common type of coal found in the United States. It is 45 to 86 percent carbon, softer than anthracite, and has a heat content between 10,500 and 14,000 Btus per pound.

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Which is the purest form of coal?

High grade (HG) and ultra high grade (UHG) anthracite are the highest grades of anthracite coal. They are the purest forms of coal, having the highest degree of coalification, the highest carbon count and energy content and the fewest impurities (moisture, ash and volatiles).