Nonrenewable Nonrenewable Energy Energy
Mar 26, 2015
Nonrenewable Nonrenewable EnergyEnergy
1. Energy 1. Energy ResourcesResources
2. Oil3. Natural Gas4. Coal5. Nuclear Energy
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Energy SourcesEnergy SourcesModern society requires large quantities of energy that are generated from the earth’s natural resources.
Primary Energy Resources: The fossil fuels(oil, gas, and coal), nuclear energy, falling water, geothermal, and solar energy.
Secondary Energy Resources: Those sources which are derived from primary resources such as electricity, fuels from coal, (synthetic natural gas and synthetic gasoline), as well as alcohol fuels.
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ThermodynamicsThermodynamics
The laws of thermodynamics tell us two things about converting heat energy from steam to work:
1)1)The conversion of heat to work cannot be 100 % efficient because a portion of the heat is wasted.
2)2)The efficiency of converting heat to work increases as the heat temperature increases.
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Energy Units and Energy Units and UseUse
Btu (British thermal unit) - amount of energy required to raise the temperature of 1 lb of water by 1 ºF.cal (calorie) - the amount of energy required to raise the temperature of 1 g of water by 1 ºC. Commonly, kilocalorie (kcal) is used.
1 Btu = 252 cal = 0.252 kcal1 Btu = 1055 J (joule) = 1.055 kJ1 cal = 4.184 J
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Two other units that are often seen are the Two other units that are often seen are the horsepower and the watt. These are not units horsepower and the watt. These are not units of energy, but are units of power.of energy, but are units of power.
1 watt (W) = 3.412 Btu / hour1 watt (W) = 3.412 Btu / hour1 horsepower (hp) = 746 W1 horsepower (hp) = 746 W
Watt-hour - Another unit of energy used only Watt-hour - Another unit of energy used only to describe electrical energy. Usually we use to describe electrical energy. Usually we use kilowatt-hour (kW-h) since it is larger.kilowatt-hour (kW-h) since it is larger.
quad (Q) - used for describing very large quad (Q) - used for describing very large quantities of energy. 1 Q = 10quantities of energy. 1 Q = 101515 Btu Btu
Energy Units and UseEnergy Units and Use
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Evaluating Energy Evaluating Energy ResourcesResources
U.S. has 4.6% of world population; uses 24% of the world’s energy;
84% from nonrenewable fossil fuels (oil, coal, & natural gas);
7% from nuclear power;
9% from renewable sources (hydropower, geothermal, solar, biomass).
Changes in U.S. Energy UseChanges in U.S. Energy Use
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Energy resources removed from the earth’s crust include: oil, natural gas, coal, and uranium
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Fossil FuelsFossil FuelsFossil fuels originated from the decay of living organisms millions of years ago, and account for about 80% of the energy generated in the U.S.The fossil fuels used in energy generation are:
Natural gas, which is 70 - 80% methane (CH4)
Liquid hydrocarbons obtained from the distillation of petroleumCoal - a solid mixture of large molecules with a H/C ratio of about 1
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Problems with Fossil FuelsProblems with Fossil FuelsFossil fuels are nonrenewable resources
At projected consumption rates, natural gas and petroleum will be depleted before the end of the 21st century
Impurities in fossil fuels are a major source of pollutionBurning fossil fuels produce large amounts of CO2, which contributes to global warming
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1. Energy Resources
2. Oil2. Oil3. Natural Gas4. Coal5. Nuclear Energy
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OilOilDeposits of crude oil often are trapped within the earth's crust and can be extracted by drilling a wellFossil fuel, produced by the decomposition of deeply buried organic matter from plants & animals
Crude oil: complex liquid mixture of hydrocarbons, with small amounts of S, O, N impuritiesHow Oil Drilling Works by Craig C. Freudenrich, Ph.D.
Sources of OilSources of Oil•Organization of Petroleum Exporting Countries (OPEC) -- 13 countries have 67% world reserves:
•Algeria, Ecuador, Gabon, Indonesia, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia, United Arab Emirates, & Venezuela
•Other important producers: Alaska, Siberia, & Mexico.
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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.
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Low oil prices have stimulated economic growth, they have discouraged / prevented improvements in energy efficiency and alternative technologies favoring renewable resources.
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•Burning any fossil fuel releases carbon dioxide into the atmosphere and thus promotes global warming.
•Comparison of CO2 emitted by fossil fuels and nuclear power.
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OilOil
Crude oil is transported to a refinery where distillation produces petrochemicals
1. Energy Resources 2. Oil
3. Natural Gas3. Natural Gas4. Coal5. Nuclear Energy
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Natural Gas - Fossil Natural Gas - Fossil FuelFuel
•Mixture •50–90% Methane (CH4)
•Ethane (C2H6)
•Propane (C3H8)
•Butane (C4H10)
•Hydrogen sulfide (H2S)www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
Sources of Natural Sources of Natural GasGas
•Russia & Kazakhstan - almost 40% of world's supply.
•Iran (15%), Qatar (5%), Saudi Arabia (4%), Algeria (4%), United States (3%), Nigeria (3%), Venezuela (3%);
•90–95% of natural gas in U.S. domestic (~411,000 km = 255,000 miles of pipeline).
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billion cubic metres
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Natural GasNatural GasExperts predict increased use of natural gas during this century
Natural GasNatural GasWhen a natural gas field is tapped, propane and butane are liquefied and removed as liquefied petroleum gas (LPG) The rest of the gas (mostly methane) is dried, cleaned, and pumped into pressurized pipelines for distributionLiquefied natural gas (LNG) can be shipped in refrigerated tanker ships
1. Energy Resources 2. Oil3. Natural Gas
4. Coal4. Coal5. Nuclear Energy
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Coal: Supply and DemandCoal: Supply and DemandCoal exists in many forms therefore a chemical formula cannot be written for it.Coalification: After plants died they underwent chemical decay to form a product known as peat
Over many years, thick peat layers formed. Peat is converted to coal by geological events such as land subsidence which subject the peat to great pressures and temperatures.
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Ranks of CoalRanks of Coal
Lignite: A brownish-black coal of low quality (i.e., low heat content per unit) with high inherent moisture and volatile matter. Energy content is lower 4000 BTU/lb.
Subbituminous: Black lignite, is dull black and generally contains 20 to 30 percent moisture Energy content is 8,300 BTU/lb.
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Ranks of CoalRanks of CoalBituminous: most common coal is dense and black (often with well-defined bands of bright and dull material). Its moisture content usually is less than 20 percent. Energy content about 10,500 Btu / lb.
Anthracite :A hard, black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter. Energy content of about 14,000 Btu/lb.
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PEATPEAT
LIGNITELIGNITE
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BITUMINOUSBITUMINOUS
ANTHRACITEANTHRACITE
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Main Coal DepositsMain Coal Deposits
BituminousBituminous
AnthraciteAnthracite
SubbituminousSubbituminous
LigniteLignite
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Advantages and DisadvantagesAdvantages and Disadvantages
Pros•Most abundant fossil fuel•Major U.S. reserves•300 yrs. at current consumption rates•High net energy yield
Cons•Dirtiest fuel, highest carbon dioxide•Major environmental degradation•Major threat to health
© Brooks/Cole Publishing Company / ITP
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CoalCoal
Coal gasification Synthetic natural gas (SNG)Coal liquefaction Liquid fuelsDisadvantage
CostlyHigh environmental impact
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Sulfur in CoalSulfur in CoalWhen coal is burned, sulfur is released primarily as sulfur dioxide (SO2 - serious pollutant)
Coal Cleaning - Methods of removing sulfur from coal include cleaning, solvent refining, gasification, and liquefaction Scrubbers are used to trap SO2 when coal is burned
Two chief forms of sulfur is inorganic (FeS2 or CaSO4) and organic (Sulfur bound to Carbon)
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Acid Mine Acid Mine DrainageDrainage
The impact of mine drainage on a
lake after receiving effluent
from an abandoned
tailings impoundment for
over 50 years
Relatively fresh tailings Relatively fresh tailings in an impoundment. in an impoundment.
The same tailings The same tailings impoundment after 7 impoundment after 7
years of sulfide years of sulfide oxidation. The white oxidation. The white
spots in Figures A and B spots in Figures A and B are gulls. are gulls.
http://www.earth.uwaterloo.ca/services/whaton/s06_amd.html
Mine effluent discharging
from the bottom of a waste rock
pile
Shoreline of a pond
receiving AMD showing
massive accumulation
of iron hydroxides on the pond
bottom
Groundwater flow through a tailings impoundment and discharging into lakes or
streams.
1. Energy Resources 2. Oil3. Natural Gas4. Coal
5. Nuclear Energy5. Nuclear Energy
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Nuclear EnergyNuclear EnergyIn a conventional nuclear power plant
a controlled nuclear fission chain reaction heats waterproduce high-pressure steam that turns turbines generates electricity.
Nuclear EnergyNuclear EnergyControlled Fission Chain Reaction
neutrons split the nuclei of atoms such as of Uranium or Plutonium
release energy (heat)
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Controlled Nuclear Fission Controlled Nuclear Fission ReactionReaction
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•Radioactive decay continues until the the original isotope is changed into a stable isotope that is not radioactive
•Radioactivity: Nuclear changes in which unstable (radioactive) isotopes emit particles & energy
RadioactivityRadioactivity
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• Types• Alpha particles consist of 2 protons and 2
neutrons, and therefore are positively charged• Beta particles are negatively charged
(electrons)• Gamma rays have no mass or charge, but are
a form of electromagnetic radiation (similar to X-rays)
• Sources of natural radiation• Soil• Rocks• Air• Water• Cosmic rays
RadioactivityRadioactivity
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Relative Doses
from Radiati
on Source
s
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The time needed for one-half of the nuclei in a radioisotope to decay and emit their radiation to form a different isotope
Half-time emitted Uranium 235 710 million yrs alpha, gammaPlutonium 239 24.000 yrs alpha, gamma
During operation, nuclear power plants produce radioactive wastes, including some that remain dangerous for tens of thousands of years
Half-LifeHalf-Life
Diagram of Radioactive Decay
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•Genetic damages: from mutations that alter genes
•Genetic defects can become apparent in the next generation
•Somatic damages: to tissue, such as burns, miscarriages & cancers
Effects of RadiationEffects of Radiation
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1. Low-level radiation (Gives of low amount of radiation)• Sources: nuclear power plants,
hospitals & universities• 1940 – 1970 most was dumped
into the ocean• Today deposit into landfills
2. High-level radiation (Gives of large amount of radiation)• Fuel rods from nuclear power
plants• Half-time of Plutonium 239 is
24000 years• No agreement about a safe
method of storage
Radioactive WasteRadioactive Waste
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Radioactive WasteRadioactive Waste1. Bury it deep underground.
• Problems: i.e. earthquake, groundwater…
2. Shoot it into space or into the sun.• Problems: costs, accident would
affect large area.
3. Bury it under the Antarctic ice sheet.• Problems: long-term stability of ice
is not known, global warming
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Radioactive WasteRadioactive Waste
4. Most likely plan for the US• Bury it into Yucca Mountain in
desert of Nevada • Cost of over $ 50 billion• 160 miles from Las Vegas• Transportation across the country
via train & truck
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Yucca Mountain
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Plutonium BreedingPlutonium Breeding238U is the most plentiful isotope of UraniumNon-fissionable - useless as fuelReactors can be designed to convert 238U into a fissionable isotope of plutonium, 239Pu
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Conversion of Conversion of 238238U to U to 239239Pu Pu
Under appropriate operating conditions, the neutrons given off by fission reactions can "breedbreed" more fuel, from otherwise non-fissionable isotopes, than they consume
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Reprocess Nuclear FuelReprocess Nuclear FuelDuring the operation of a nuclear reactor the uranium runs outAccumulating fission products hinder the proper function of a nuclear reactorFuel needs to be (partly) renewed every year
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Plutonium in Spent FuelPlutonium in Spent FuelSpent nuclear fuel contains many newly formed plutonium atoms Miss out on the opportunity to splitPlutonium in nuclear waste can be separated from fission products and uraniumCleaned Plutonium can be used in a different Nuclear Reactor
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Nuclear EnergyNuclear EnergyConcerns about the safety, cost, and liability have slowed the growth of the nuclear power industryAccidents at Chernobyl and Three Mile Island showed that a partial or complete meltdown is possible
Nuclear Power Plants in Nuclear Power Plants in U.S.U.S.
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Three Mile IslandThree Mile Island
•March 29, 1979, a reactor near Harrisburg, PA lost coolant water because of mechanical and human errors and suffered a partial meltdown
•50,000 people evacuated & another 50,000 fled area
•Unknown amounts of radioactive materials released
•Partial cleanup & damages cost $1.2 billion
•Released radiation increased cancer rates.
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ChernobylChernobyl•April 26, 1986, reactor explosion (Ukraine) flung radioactive debris into atmosphere
•Health ministry reported 3,576 deaths
•Green Peace estimates32,000 deaths;
•About 400,000 people were forced to leave their homes
•~160,000 sq km (62,00 sq mi) contaminated
•> Half million people exposed to dangerous levels of radioactivity
•Cost of incident > $358 billionwww.bio.miami.edu/beck/esc101/Chapter14&15.ppt
Nuclear EnergyNuclear EnergyNuclear plants must be decommissioned after 15-40 yearsNew reactor designs are still proposedExperimental breeder nuclear fission reactors have proven too costly to build and operateAttempts to produce electricity by nuclear fusion have been unsuccessful
Use of Nuclear Use of Nuclear EnergyEnergy
•U.S. phasing out•Some countries (France, Japan) investing increasingly
•U.S. currently ~7% of energy nuclear•No new U.S. power plants ordered since 1978
•40% of 105 commercial nuclear power expected to be retired by 2015 and all by 2030
•North Korea is getting new plants from the US
•France 78% energy nuclear
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Phasing Out Nuclear PowerPhasing Out Nuclear Power•Multi-billion-$$ construction costs
•High operation costs
•Frequent malfunctions
•False assurances and cover–ups
•Overproduction of energy in some areas
•Poor management
•Lack of public acceptancewww.bio.miami.edu/beck/esc101/Chapter14&15.ppt
2) Energy2) EnergyEnergy & Energy & Mineral resourcesMineral resources