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Coal is the most abundant fossil fuel and also regarded, as the dirtiest not only is coal inherently impure by composition by the fact that it contains ash and sulfur; coal is also difficult to burn completely. Many techniques to combust coal have been developed s ....

Middle of Essay
.... And produces nearly 15,000 Btu's per pound (British Thermal Unit, is the amount of heat needed to raise the temperature of the pound of water one degree Fahrenheit) (Bartow 1) The second type of coal is Bituminous or soft coal. It's the most plentiful type of coal in the States, and is mainly found in the eastern and middle part of the North American continent. Bituminous coal is primary used to generate electricity, and has a carbon content of 45 to 86 percent and a heat value of 10,500 to 15,000 Btu's. Sub-bituminous coal rank just below bituminous coal with 35 to 45 percent carbon content. The heat value of Sub-bituminous coal is between 8,3 ....