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RENEWABLE ENERGY RESOURCES . FOSSIL FUELS, ELECTRICITY PAST PRESENT & FUTURE. Key Words. Energy – being able to do work. e.g. food gives us energy, so that we can move Fuel - Fuel is anything that is burned or altered to obtain energy. Fuel gauge. Energy.

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RENEWABLE ENERGY RESOURCES

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RENEWABLE ENERGY RESOURCES

FOSSIL FUELS, ELECTRICITY

PAST PRESENT & FUTURE


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Key Words

  • Energy – being able to do work. e.g. food gives us energy, so that we can move

  • Fuel - Fuel is anything that is

    burned or altered to obtain energy

Fuel gauge


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Energy

“Some 2 billion people lack access to electricity and rely on traditional fuel sources such as firewood, kerosene, or biomass for their cooking and heating.”


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World electricity generation by energy

Renewable 21%

Nuclear 16%

Fossil fuels 63%

Electricity

Generation & Distribution

  • Electricity generation: fossil fuels and uranium

  • Renewable energy is growing

(US Energy Information Administration, 2004)


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I. Fossil Fuels

  • Petroleum

  • Natural Gas

  • Coal

  • Oil Shale and Tar Sands

  • CO2 Emissions


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Energy from fossil fuels

Fossil fuels are coal, oil and gas

Coal oil and gas

  • Fossil fuels were formed from

    dead plants and animals over

    millions of years.

fossils


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Energy from fossil fuels

  • Fossil fuels have formed over millions of years. Plants and animals died and were immediately covered by sediment in seas or swamps.

  • After millions of years of pressure and heat (900C to 1200C), these remains turned into COAL, OIL and NATURAL GAS.

  • Coal comes mainly from dead plants, like trees, falling into swamps.

  • Oil and gas occur together and were formed from both plants and animals being buried.

  • When we burn fossil fuels we’re using the sun’s energy that has been stored as chemical energy underground for millions of years.


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How ‘fossil fuel’ power stations work:

  • Coal is crushed to a fine dust and burnt. Oil and gas can be burnt directly.

www.vauxhallsociety.org.uk


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Why use fossil fuels to make electricity?

Advantages

  • Electricity can be generated fairly cheaply.

  • Transporting oil and gas to the power stations is easy.

  • Gas-fired power stations are very efficient.

  • A fossil-fuelled power station can be built almost anywhere.

    Disadvantages

  • Pollution. Burning any fossil fuel produces carbon dioxide, which contributes to the "greenhouse effect", warming the Earth.

  • Burning coal produces more carbon dioxide than burning oil or gas.

  • Mining coal can be difficult, dangerous and ugly.

  • Coal-fired power stations need huge amounts of fuel.

  • Fossil fuels are a non- renewable energy resource. Once we've burned them all, there isn't any more and our use of fossil fuels has nearly doubled every 20 years since 1900. This is a particular problem for oil, because we also use it to make plastics and many other products.


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World Greenhouse Gas Emissions


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hold down CO2

  • The best way to hold down CO2 increases is to remove fossil fuels from electricity generation, but use it just for vehicles.

  • Since ½ of US electricity comes from coal which generates twice as much CO2 per energy unit as does natural gas, we should switch to natural gas. This, however, involves massive and possibly costly imports.

  • We need increases in alternate energy sources such as hydro, nuclear, wind and solar.

  • We also need increases in energy efficiency and conservation.

  • This especially includes high mileage vehicles.


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Carbon in Fuels: Billions of tons of C


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Increasing Demands And Consequences

  • Oil is extracted at the rate of 75 million barrels per day, which means the current reserves are predicted to last only for another 35-40 years.

  • The cost of oil has already increased so much


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COALThe energy bridge to the future!!

  • First fossil fuel to be discovered.

  • Pushed to background because of its environmental effects.

  • The two major uses for coal – steel production and electricity.

  • Accounts for 23% of the global primary energy demand, 38% of world electricity production and 70% of world steel production.


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  • Major pollutants are volatile organic compounds (VOC), Nitrogen oxides (NOX), CO, SO2, particulate matter, mercury and lead.

  • Electric utility power plants 72%, 35%, and 33% of total emissions of SO2, CO2, and NOx.

  • Average mercury content of coal is 7.4 pounds per trillion Btu of energy input to the coal-fired electricity generator.


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Reverting to COAL

  • For coal to reestablish itself as the primary fuel, it will need to reduce its environmental footprint.

    Comparison of Air Pollution from the Combustion of Fossil Fuels (kilograms of emission per TJ of energy consumed)


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Combined Cycle

  • Combines gas turbine and steam turbine.

  • Exhaust energy from gas section used in steam system.

  • High thermal efficiency.

  • Small plants combined.


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Gasification

  • Breaks down coal into basic chemical constituents.

  • Coal is exposed to hot steam and controlled amounts of air or oxygen under high temperature and pressures.

  • Carbon molecules in coal break apart, setting off chemical reactions that produce syn gas and other gaseous compounds.

    Integrated gasification combined-cycle (IGCC)

  • Syn gas is burned in a combustion turbine which drives an electric generator.

  • The exhaust gases are used to heat steam.


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Carbon Sequestration

It is a family of methods for capturing and permanently isolating gases that could contribute to global climate change.

CARBON CAPTURE

  • Pre-combustion capture

  • Post-combustion capture

  • Oxyfuel technologies. 

    CARBON DIOXIDE SEQUESTRATION

  • Industrial use of CO2 in plastics and other chemical industries

  • Inorganic sequestration as carbonates

  • Biological conversion to fuel

  • Geological sequestration, in salt domes, or coal beds

  • Injection into active oil wells

  • Injection into exhausted gas or oil wells

  • Ocean disposal


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Natural Gas

  • The world had around 5500 trillion cubic meters at the end of 2003.


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Why Natural Gas?

  • Cleaner fuel, has low carbon/hydrogen ratio hence less carbon dioxide emission.

  • Has a distinct hydrogen-rich molecular structure, hence supply hydrogen for future technologies like fuel cells.


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Methane Hydrate…the gas resource of the future

  • It is a compound of water and methane

  • Forms under pressure at cold temperatures.

  • Potential significant source of natural gas.

  • Large volumes of hydrate based natural gas found on Alaska's North Slope.

  • Natural gas potential of methane hydrate approach 400 million trillion cubic feet.


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Atmosphere and Climate Change


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Figure 19.6

HEAT EXCHANGE WITHIN EARTH SYSTEMS


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The Greenhouse Effect


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Reducing the Impact of Global Warming


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Fuel Switching

Substitute 1400 natural gas electric plants for an equal number of coal-fired facilities

Photo by J.C. Willett (U.S. Geological Survey).


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Nuclear Electricity

Triple the world’s nuclear electricity capacity by 2055

Graphic courtesy of NRC


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Nuclear Power - energy from splitting Uranium atoms

  • Nuclear power is generated using Uranium, which is a metal mined in various parts of the world.

  • Nuclear power produces around 11% of the world's energy needs, and produces huge amounts of energy from small amounts of fuel, without pollution.

electronicsdesigninfo.blogspot.com


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Advantages of using nuclear power


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disadvantages


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Solar Electricity

Install 20,000 square kilometers for dedicated use by 2054

Photos courtesy of DOE Photovoltaics Program


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Solar power

  • Most of the Earth's energy comes from the sun

  • Solar power is energy from the sun

  • There are two main ways that we use the Sun's energy

  • 1. Solar Cells

  • 2. Solar water heating


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Why Use Solar power?

Advantages

  • Solar energy is free - no fuel, no waste or pollution.

  • In sunny countries, easy to use in remote places

  • Good for low-power uses such as solar powered garden lights and battery chargers

    Disadvantages

  • Doesn't work at night.

  • Very expensive to build solar power stations.

  • Can be unreliable unless you're in a very sunny place

  • Solar energy is renewable because the sun is always there


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Wind Electricity

Install 1 million 2 MW windmills to replace coal-based electricity,

OR

Use 2 million windmills to produce hydrogen fuel

Photo courtesy of DOE


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Wind power

  • Wind power also comes from the sun; winds blow because the Sun warms our atmosphere. Warm air tends to rise, and winds are due to other air moving in to replace it.

  • The wind blows the propeller round, which

    turns a generator to produce electricity

  • We tend to build many of these towers together, to make a "wind farm" and produce more electricity.

  • The more towers, the more wind, and the larger the propellers, the more electricity we can make


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Why use wind power?

Advantages

  • Wind is free.

  • Produces no waste or greenhouse gases.

  • The land beneath can usually still be used for farming.

  • Wind farms can be tourist attractions.

  • A good method of supplying energy to remote areas

    Disadvantages

  • The wind is not always predictable - some days have no wind.

  • Suitable areas for wind farms are often near the coast, where land is expensive.

  • Some people feel that covering the landscape with these towers is ugly

  • Can kill birds.

  • Can affect television reception if you live nearby.

  • Can be noisy.

  • Wind power is renewable. Winds will keep on blowing.


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Hydro-electric power

  • Hydro-electric power is generated from falling water. Nowadays there are many hydro-electric power stations, providing around 20% of the world's electricity.

    How it works:

  • A dam is built to trap water, usually in a river valley.

  • Water is allowed to flow through tunnels in the dam, to turn turbines

    and thus drive generators to produce electricity.

(http://www.wvic.com/hydro-works.htm) 


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Why use Hydro-electric power?


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Hydro-electric power is renewable. The Sun provides the water by evaporation from the sea, and will continue to do it.

Disadvantages


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Tidal power - energy from the sea

  • How it works: Tidal Barrages

  • These work rather like a hydro-electric scheme

  • A huge dam (called a "barrage") is built across a river estuary. When the tide goes in and out, the water flows through tunnels in the dam.

  • The ebb and flow of the tides can be used to turn a turbine.


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Advantages of tidal power


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Disadvantages of tidal power

  • A barrage across an estuary is very expensive to build, and affects a very wide area. - the environment and birds. There are few suitable sites for tidal barrages.

  • Only provides power for around 10 hours each day, when the tide is actually moving in or out.

    Tidal energy isrenewable. The tides will continue to ebb and flow, and the energy is there for free.


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Biofuels & Biomass

Scale up current global ethanol production by 30 times

Photo courtesy of NREL


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Biomass - energy from organic materials

  • Sugar cane can be used to make alcohol, which can be burned to generate power

  • Other solid wastes, can be burned to provide heat, or used to make steam for a power station

  • We can use rubbish, animal manure, woodchips, seaweed, corn stalks and other waste


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Advantages

  • It makes sense to use waste materials where we can.

  • The fuel tends to be cheap.

  • Less demand on the Earth's resources.

    Disadvantages

  • Collecting the waste in sufficient quantities can be difficult.

  • We burn the fuel, so it makes pollution.

  • Some waste materials are not available all year round.

    Biomass isrenewable, as we're going to carry on making waste products. We can always plant and grow more sugar cane and more trees, so those are renewable too.


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Geothermal Energy is energy from heat inside the Earth.

How it works

  • Hot rocks underground heat water to produce steam. We drill holes down to the hot region; steam comes up, is purified and used to drive turbines, which drive generators to make electricity.

  • Geothermal energy is an important resource in volcanically active places such as Iceland and New Zealand.


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Advantages


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disadvantages


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Energy Storage Systems


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Importance of Energy Storage Systems...

  • Thrust for Renewable Energy sources

  • Variable outputs

  • new technologies and devices?


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Different Types of Energy Storage Systems

  • Mechanical Energy Storage.

  • Magnetic Energy Storage.

  • Thermal Energy Storage.

  • Chemical Energy Storage.


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“ The path to the future is neither as rosy as some people hope nor as thorny as others fear, but depends on how effectively we pick out the weeds and nurture the bush as we walk ”


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