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Evaluating Energy ResourcesEvaluating Energy Resources
• U.S. has 4.6% of world population; uses 24% of the world’s energy;
– 85% from nonrenewable fossil fuels (oil, coal, & natural gas);
– 8% from nuclear power;
– 7% from renewable sources (hydropower, geothermal, solar, biomass).
Energy resources removed from the earth’s crust include: oil, natural gas, coal, and uranium
www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
Problems with Fossil FuelsProblems with Fossil Fuels1. Nonrenewable resources
– At projected consumption rates, natural gas and petroleum will be depleted before the end of the 21st century
2. Pollution: Impurities in fossil fuels
3. Global Warming: Burning fossil fuels produce large amounts of CO2
www.lander.edu/rlayland/Chem%20103/chap_12.ppt
COAL is cheaper, GAS is cleaner, OIL is the highest quality
Coal: $0.85 per million BtuNatural Gas: $2.18 per million Btu
Crude Oil: $2.97 per million Btu
1. Coal1. Coal2. Oil3. Natural Gas4. Nuclear Energy
•Mostly Carbon (40-98%)•Water (0.2 – 1.25%)•Sulfur (0.2 – 2.5%)•Trace amounts of radioactive materials found in the earth.
• The longer it’s been forming, the higher the grade
– Carbon content increases
– Burns hotter & cleaner!
PEATPEAT
LIGNITELIGNITE
garnero101.asu.edu/glg101/Lectures/L37.ppt
BITUMINOUSBITUMINOUS
ANTHRACITEANTHRACITE
What type of coal? P, L, B, A
1. The major US deposits are located in eastern PA
2. The most common type of coal in terms of its occurrence around the United States
3. A brownish black organic material that is used to build up garden soil
4. Because of its wide availability around the country, this type of coal is most often burned at electric power generation plants
Use the map to answer the following…
Eastern or Western?
1. Coal from this region is generally closer to the surface and is commonly strip-mined
2. Because of higher labor intensity, coal from this region is more expensive
3. Because of low annual rainfall, reclamation of mined land in this region is more difficult.
Who uses it?• China is the largest user: 76% of its E
• Used to make 75% of the world’s steel
• 39% of world’s electricity– What about in US?
Extracting Coal: Subsurface Mining• for coal buried 200-1,000 ft. deep• miners work in tunnels to get coal from underground
– Most dangerous, most laborious– Subsidence and black lung
Tour a Coal Mine: http://www.youtube.com/watch?v=Bk-jrbCi7Sc&feature=related
Extracting Coal: Surface Mining
• for coal that is buried less than 200 feet deep– Strip Mining – remove surface– Open Pit Mining – near surface but dig down
– Cheaper and safer– Higher % of coal recovered – Reclamation Reform Act
• study, fill, replant• coal tax to restore old mines
http://www.npr.org/blogs/pictureshow/2009/03/removing_mountains.html
Centralia, PA
• http://www.youtube.com/watch?v=fkHfnp2czZQ• More than 500 fires burning in coal deposits and
waste heaps in the US
© Brooks/Cole Publishing Company / ITP
www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
CoalCoal
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
Coal Coal (solid) • Changing form is slightly better
for pollution, but lessens net E• Coal gasification
Synthetic natural gas (SNG)• Coal liquefaction Liquid fuels
• http://www.youtube.com/watch?v=l_K8jXrtPZQ• Sequestration and climate change applications
CO2 Sequestration
How can we link carbon sequestration and tertiary oil recovery?
SciFi! Can we ship our CO2 to another planet and make an atmosphere???
What is oil?• Petroleum (crude oil)
– complex liquid mixture of hydrocarbons, with small amounts of S, O, N impurities
• Most valuable natural resource (?)– Gasoline, heating oil, jet fuel,
grease, wax, asphalt, plastics…
What is petroleum used for?
• Fuel – transportation (65%), generating electricity
• Making products - plastic, fleece, ink, floor wax, soap, carpet, nail polish, aspirin, etc. (over 6,000 products)
Fractional Distillation
• From extraction, oil travels via pipeline to a refinery
• Impurities are removed
• Oil is heated, which separates the various liquids by various boiling points
http://www.absorblearning.com/media/item.action?quick=11khttp://www.absorblearning.com/media/item.action?quick=11o
Oil Extraction
• Primary Oil Recovery– Drill well– Pump out oil that flows by
gravity into well
• Secondary Oil Recovery– Inject water into nearby water
to force oil into well.
http://www.absorblearning.com/media/item.action?quick=11h
Enhanced (Tertiary) Oil Recovery
http://www.youtube.com/watch?v=NMBhX1IxajU&feature=related
Recovery & Net Energy• In any oil field, only 1/3
of the heavy oil can actually be recovered by 1st or 2nd –ary methods
• Tertiary recovery uses the energy of 1/3 of a barrel of oil for each barrel it produces
• (<4min)
http://www.youtube.com/watch?v=QVMRu7GjR7o&feature=related
Who Has the Oil? Reserves
North America 75.7
South and Central America 89.5
Western Europe 18.9
Former Soviet Countries 58.9
Middle East 673.6
Africa 75.4
Far East and Oceania 43.0
Total 1,033.2
OPEC• Organization of Petroleum Exporting Countries
– Set up in 1960 so developing countries would get a fair price for the resource.
– Control 67% of world’s oil
– Saudi Arabia (#1), Iraq (#2), Iran, Kuwait, United Arab Emirates, Algeria, Libya, Nigeria, Ecuador, Gabon, Indonesia, Qatar, and Venezuela
Oil in U.S.Oil in U.S.•2.3% of world reserves
•uses nearly 30% of world reserves;
•65% for transportation;
•increasing dependence on imports.
www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
Future of Reserves
• Economically depleted– When 80% of a resource has been used– Cost to extract remaining supply is more expensive than its
sale price.
• Why change when you’ve found a good thing?– Government subsidizes price of oil– In turn...
• Low oil prices = stimulated economic growth • discourages improvements in energy efficiency and alternative
technologies
What a Barrel of Persian Gulf Oil Really Costs U.S. Consumers
• $30 in initial costs • + $61 for military support services • = $91 per barrel of oil
(Prentice Hall 2005)
• Oil near $119 after report of Iranian boat firing– MSNBC April. 25, 2008
• Currently around $90/barrel (2013)
Should we use oil?
PROS• High net energy yield
• Low cost (with subsidies)
• Easily transported
CONS• Low reserves
• Artificially low price causes waste and discourages alternatives
• Air pollution (smog, acid rain)
• Global warming
• Oil spills and water pollution
Oil Shale Oil Shale (kerogen) & Tar Sand Tar Sand (bitumen)
• Different forms of rock/sand that can be transformed (crushed/heated or pressurized) to be use like crude oil.
Oil Shales/Tar Sands• Pros
– Availability: Global supplies of shale oil may be 200x’s larger than conventional oil supplies
• Cons– Processing
• Uses ½ barrel of oil to process (heat)
• Uses large amounts of water (in desert areas!)
• Surface mining• Groundwater
contamination (salts, carcinogens, & toxic metals)
Energy Consumption in the United StatesEnergy Consumption in the United States
1. Wood2. Water (steam)3. Coal4. Natural gas5. Oil6. Nuclear power
3, 4, and 5 = 83.5% of U.S. energy consumption
ANWR and offshore drilling• http://www.youtube.com/watch?v=DjfssrKGsBU – Jay Leno
• http://www.cbsnews.com/video/watch/?id=6351721n – Obama offshore drilling
• http://www.youtube.com/watch?v=QP2GejkLdwA – ANWR and offshore• http://www.youtube.com/watch?v=bO_3eiOPuqE (1:30)
• http://ngm.nationalgeographic.com/ngm/0605/sights_n_sounds/– http://ngm.nationalgeographic.com/ngm/0605/feature1/index.html -
drilling in Alaska article
Natural Gas - Fossil FuelNatural Gas - Fossil Fuel• Mixture
•50–90% Methane (CH4) •Ethane (C2H6)•Propane (C3H8) •Butane (C4H10)•Hydrogen sulfide (H2S)
www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
Where is it found?Where is it found?
•Conventional natural gas = above most reservoirs of crude oil
•Unconventional = deposits of gas hydrates (water + methane)
• Global deposits estimated to contain 2X as much carbon as all other fossil fuels
• Not yet economically feasible
www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
Natural Gas ReservesNatural Gas Reserves•Russia (25%)
•Iran (15%), Qatar (14%), Saudi Arabia (4%), United Arab Emirates (4%)
•United States (3%),
www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
90–95% of natural gas used in U.S. is domestic 255,000 miles of pipeline
Interactive Map: http://www.npr.org/templates/story/story.php?storyId=112970060
Natural Gas Extraction
1. Tap gas field - Propane & butane are liquefied (liquefied petroleum gas - LPG)
• Stored in pressurized tanks
2. Remaining gas (methane) is dried to remove water, cleansed to remove impurities,
• Odor is added to detect leaks
Processing
Pressurized & piped to homes.
Liquefied natural gas (LNG) can be shipped in refrigerated tanker ships
• Lose ¼ of net energy when this is done