A. Explain the reasons for the differences in the various properties of Anthraci

ID: 546128 • Letter: A

Question

A. Explain the reasons for the differences in the various properties of Anthracite, Bituminous, Sub-bituminous and Lignite Coal. Include age of the coal in your analysis. B. The world total coal reserves were estimated at 1.037E12 metric tons (1 metric ton 2.204.62 lbm) in 1997 by the Energy Information Agency. Assume the entire supply is Bituminous. What is the total energy content of the worl'ds coal supply in this case? Use units of Quads where 1Quad () quadrillion (i.e., E15) BTUU C. In 1997 the world consumed 97Q ofcl Ifthis level of consumption stays level through a major increase in energy conservation and energy efficiency, how many years of coal supplies remain

Explanation / Answer

A)Difference between lignite, bituminous anthracite

property

Ligntite

Bituminous

anthracite

Colour

Blackish Brown

Black

Greyish Black

Lustre

Some lustre

Metallic lustre

Natural moisture

High

Relatively lower

lowest

Hardness

Softer

Soft

hardest

Carbon Content

<40%

40-90%

>90%

Lignite, commonly referred to as brown coal, is the very first coal formation, or the “youngest” of the coal products. With high emissions and low energy value, this type of coal is most used in power plants. After lignite, coal evolves into what is called subbituminous coal. Subbituminous coal is lignite coal that has been naturally processed for a longer time period, and also deeper in the ground. This type of coal has a higher energy content, but a lower sulfur content, making it burn more cleanly. The most abundant of the coals, bituminous coal is the third ranking of the coal family

b)The world coal reserves on 1997 is 1.037E12 metric tons i.e 1.03 x 1012

If one quadrillion is equal to 1015 BTU

Then the consumption is 1.531371453320855e27BTU