Arrange the types of coal according to the ascending order of carbon content.
Answers
Answer:
Different coal types are all minerals and rocks made largely of carbon. This fossil fuel generates ~40% of the world's electricity and about 25% of the world's primary energy. However, not all coal used is the same; it comes in different quantity levels of carbon—which dictates the quality of the coal. Higher quality coal produces less smoke, burns longer, and provides more energy than lower quality coal.
The table below includes the carbon contents, and energy densities of coal. In addition, it states the moisture content before drying, and the amount of volatile content, after it's dried.
Table 1: Types of Coal[1]
Coal Dry, Carbon content (%) Moisture content before drying (%) Dry, volatile content (%) Heat Content (MJ/kg)
Anthracite 86-92 7-10 3-14 32-33
Bituminous coal 76-86 8-18 14-46 23-33
Sub-Bituminous coal 70-76 18-38 42-53 18-23
Lignite 65-70 35-55 53-63 17-18
Peat <60 75 63-69 15
The following is an overview of the different grades of coal, ordered from lowest to highest quality. Please see their main pages to learn more about each type.