1. Coal

2. What is coal? Readily combustible rock Mostly carbon with small amounts of water and sulfur

3. Coal Facts Most abundant fossil fuel –400 year supply 66% of known coal is located in the U.S. U.S. is 2 nd largest consumer of coal –China is 1 st ! Most environmentally damaging fossil fuel.

4. Swamp

5. Coal Formation –Decomposition of ancient swamp plants Quick burial Partially decayed due to anaerobic conditions (some carbon remains) –Intense heat & pressure “cooked” remains –Time – millions of years to form

6. Formation of Coal

7. PEATLIGNITE garnero101.asu.edu/glg101/Lectures/L37. ppt garnero101.asu.edu/glg101/Lectures/L37. ppt

8. BITUMINOUS ANTHRACITE garnero101.asu.edu/glg101/Lectures/L37. ppt garnero101.asu.edu/glg101/Lectures/L37. ppt

9. Grades of Coal Lignite (brown coal) –Low quality: Energy content: 4000 BTU/lb Bituminous (soft coal) –Most common –Range from 8,300 – 10,500 BTU/lb Anthracite (hard coal) –Highest carbon content – 98% (hottest burning) –Lowest sulfur content –Lowest water content –Energy content: 14,000 BTU/lb www.uvawise.edu/philosophy/Hist%20295/ Powerpoint%5CCoal.ppt

10. The longer it’s been forming, the higher the grade –Carbon content increases –Water decreases –Burns hotter & cleaner!

11. World Coal Deposits – Most abundant where?

12. U.S. Coal Deposits

13. Surface Mining -for coal that is buried less than 200 feet deep - cheaper

14. Underground Mining for coal buried 200-1,000 ft. deep

16. What is it used for? Burned to generate electricity –½ of electricity in US is from coal Making steel –used to smelt iron ore into iron

17. Environmental Concerns Surface mining – removes the top of an entire mountain Toxic chemicals – (mercury) leach from waste rock into nearby streams Pollution, Acid Rain, & Global Warming – depends on the grade of the coal

21. http://www.youtube.com/watch?v=Bk-jrbCi7Sc&feature=related Tour through a coal mine http://www.youtube.com/watch?v=fkHfnp2czZQ Centralia, PA

22. Converting Solid Coal Changing form is slightly better for pollution, but lessens net E Coal gasification  Synthetic natural gas (SNG) Coal liquefaction  Synthetic liquid fuels http://www.youtube.com/watch?v=l_K8jXrtPZQ Sequestration and climate change applications

23. © Brooks/Cole Publishing Company / ITP www.bio.miami.edu/beck/esc101/Chapter14&15.pptCoal Cons Dirtiest fuel, highest carbon dioxide Major environmental degradation Major threat to health Pros Most abundant fossil fuel Major U.S. reserves 300 yrs. at current consumption rates High net energy yield