2. ο World Energy Production
ο World Energy Consumption
ο Types of Energy
ο Biomass
ο Hydropower
ο Nuclear
ο Renewable (Geothermal, Wind, Solar)
ο Fossil
ο Future Energy Use
3. ο Energy production has steadily increased.
ο According to US DOE
ο 215.4 quadrillion BTU in 1970.
ο 417.1 quadrillion BTU in 2003.
ο Primary energy has increased by 94% from 1970 to 2003.
4. World primary energy production by source (1970 β 2003)
Source: US DOE (Annual Energy Review, 2004)
5. Top energy producing countries (2003)
Source: US DOE (Annual Energy Review, 2004)
6. ο Energy consumption is directly related to quality of
life.
ο Quality of life is quantified (by UN) using HDI
(Human Development Index).
ο Factors considered in HDI include:
ο Life expectancy
ο Education
ο GDP β output of goods & services (economic growth).
7. UN HDI versus annual energy consumed per capita (1999)
Sources: UN Human Development Report (2001) & US DOE (2002)
8.
9. World primary energy consumption by region (1980 β 2003)
Source: US DOE (International Energy Annual, 2003)
11. ο Biomass (biological mass) refers to organic material
(e.g. plant, animal waste, wood, algae & seaweed, and
garbage).
ο They are basically used for lighting, cooking, heating,
& making simple artefacts.
ο Biomass can be converted to biofuel by
thermochemical conversion and biochemical
conversion.
12. Thermochemical Conversion
ο Heating biomass in an oxygen-free or low-oxygen
atmosphere.
ο Materials are transformed into simpler substances that
can be used as fuels.
ο Examples include charcoal and methanol.
ο Anaerobic digestion (in sewage treatment plants) is
used to generate methane gas.
13. Biochemical Conversion
ο Uses enzymes, fungi, or other microorganisms.
ο High-moisture biomass is converted into liquid or
gaseous fuels.
ο Example includes using bacteria to convert manure,
agricultural wastes, paper, and algae into methane.
ο Using yeast to decompose carbohydrates (e.g. corn and
sugar), yielding ethyl alcohol (ethanol). Ethanol can be
mixed with gasoline to create gasohol.
14. ο Disadvantages of Biomass
ο Deforestation from cutting down trees, which can in
turn leads to soil erosion and mudslides.
ο Pollution of environment from burning of wood.
15. ο Hydropower was originally used to turn waterwheels of
mills to grind grains.
ο Dams (hydropower plants) are built to convert the
energy of flowing water into mechanical energy
(turning turbines) to create electricity.
ο In 2006, the worldβs largest dam (3 Gorges Dam) was
completed on the Yangtze River, China. Capacity is
84.7 billion kWh/year of electricity.
Size
Electricity Generating Capacity (MW)
Micro
< 0.1
Small
0.1 β 30
Large
> 30
16.
17.
18. ο Advantage
ο Low operating costs.
ο Disadvantages
ο Expensive to build
ο Drought conditions can affect water supply
ο Reliance on rain and melting snow
ο Environmental concerns (ruined streams, dried up
waterfalls, and altered aquatic habitats).
19. ο Nuclear energy can be obtained from 2 principal types
of reactions:
ο Fission β splitting of 1 large nucleus into 2 smaller
nuclei.
ο Fusion β joining of 2 small nuclei into 1 large nucleus.
ο Nuclear reactors are designed primarily for electricity
generation.
ο They also provide power for ships (submarines &
aircraft carriers) and serve as training & research
facilities .
26. ο Advantages
ο A long-term source of abundant energy
ο Power plants do not produce greenhouse gases (CO2 and
methane).
ο Disadvantages
ο Waste disposal: end products of nuclear fission are
highly radioactive and have half-life in thousands of
years.
ο Nuclear plants can contaminate air, water, the ground,
and the biosphere.
27. ο Renewable energy is naturally regenerated.
ο Sources include:
ο Geothermal β heat of the earth.
ο Wind
ο Solar β the sun
ο Sometimes, hydropower and biomass are included in
this category.
28. ο Geothermal energy is the natural, internal heat of
Earth trapped in rock formations deep underground.
ο Only a fraction of it can be extracted.
ο Examples are hot springs, geysers, and fumaroles.
ο Hot water or steam from these sources are used for
heating buildings and processing food.
29. ο Pressurized hot water or steam can be directed toward
turbines for electricity generation.
ο Geothermal energy is usable only when it is
concentrated in one spot (thermal reservoir).
ο There are 4 types of reservoirs:
ο Hydrothermal reservoirs
ο Dry rock reservoirs
ο Geopressurized reservoirs
ο Magma
30.
31. Hydrothermal Reservoirs
ο Underground pools of hot water covered by a
permeable formation through which steam
escapes.
ο At the surface, the steam is purified and piped
directly to electrical generating station.
ο Cheapest and simplest form of geothermal energy.
Dry Rock
ο Most common geothermal sources.
ο Typical more than 6,000 ft below the surface.
ο Water is injected into hot rock formations and the
resulting steam or water is collected.
32. Geopressurized Reservoirs
ο They contain hot water & methane gas.
ο Supplies of geopressurized energy remain
uncertain.
ο Drilling is expensive.
Magma
ο Molten or partially liquefied rock.
ο Found from 10,000 ft β 30,000 ft below the surface.
ο Temperature ranges from 900 oC β 1,205 oC.
ο Extraction is still in the experimental stages.
33. ο Disadvantages
ο Geothermal plants are not efficient.
ο They must be built near a geothermal source, so
accessibility to consumers is a challenge.
ο Noise pollution.
ο Harmful pollutants may be released: NH3, H2S, arsenic,
boron, & radon.
ο Collapse of the land & water shortages due to massive
water withdrawal.
34. ο Historical applications include sailing and driving
windmills.
ο Early windmills were used to pump water and grind
grain in mills.
ο When βharvestedβ by turbines, wind can be used to
generate electricity.
ο A wind farm (or park) is a collection of wind turbines.
The areal extent of the farm depends on the radius of
the rotor blades.
35.
36. ο Advantages
ο Clean energy. No emission of greenhouse gases.
ο Disadvantages
ο Rotating blades can kill birds, interfering with migration
patterns of birds.
ο Noise pollution.
38. ο The luminosity of sun β 3.8 x 1026 W.
ο Radiation from sun is comparable to the radiation
emitted by a black body at 6,000 oK.
ο Solar constant (β 1,370 W/m2) is the amount of
radiation from the sun that reaches the earthβs
atmosphere.
ο In the atmosphere, solar radiation can be absorbed or
scattered away from the earthβs surface by atmospheric
particles (air, water vapour, dust particles, and
aerosols).
39.
40. Passive solar
ο Building design with environmental factors that enable
the capture or exclusion of solar energy.
ο Mechanical devices are not used in applications.
ο Examples are roof overhang & thermal insulation.
42. Active solar
ο Building design & construction of systems that collect
and convert solar energy into other forms of energy
(heat & electrical energy).
ο Mechanical devices are used in applications.
ο Examples are solar heat collector & solar power plant.
46. ο Fossils are dead, decayed, & transformed organisms
(plants & animals).
ο Fossil energy comes from the combustion of fossil
fuels.
ο Fossil fuels include:
ο Coal
ο Hydrocarbon (crude oil & natural gas)
ο Fuel fuels are still the primary fuels for generating
power.
48. ο Coal is a black, combustible, mineral solid.
ο Coal is formed from organic debris by coalification
ο
ο
ο
ο
process.
It developed over millions of years in an airless space
under increased temperature & pressure.
Organisms that form coal include: algae, zooplankton,
phytoplankton, bacteria decay of plants, & animals.
Coal is used as a fuel and in the production of coal gas,
water gas, coal-tar compounds, & coke.
There are 4 types of coal: anthracite, bituminous, subbituminous, & lignite.
49. Anthracite
ο Hard coal & jet-black. Highest ranked.
ο Moisture content < 15%
ο Heating value β 22 million β 28 million BTU/ton.
ο Used for electricity generation & space heating.
Bituminous
ο Soft coal, dense & black.
ο Moisture content < 20%
ο Heating value β 19 million β 30 million BTU/ton.
ο Used for electricity generation, space heating, & coke
production.
50. Sub-bituminous
ο Dull black. Also known as black lignite.
ο Moisture content = 20% β 30%
ο Heating value β 16 million β 24 million BTU/ton.
ο Used for electricity generation & space heating.
Lignite
ο Brownish-black. Lowest ranked.
ο Moisture content high
ο Heating value β 9 million β 17 million BTU/ton.
ο Used for electricity generation.
51. Coal Mining
ο The method used depends on the terrain & the depth
of the coal. There are 2 methods:
ο Underground Mining β coal depth > 200 ft below
surface. Some coal must be left untouched to form
pillars that prevent the mines from caving in. Popular
till early 1970s.
ο Surface Mining β coal depth < 200 ft. There 2 types:
area surface mining & contour surface mining.
ο Coal is transported to consumers by ground
transportation, especially by trains.
58. ο Hydrocarbons are organic compounds, composed
entirely of carbon and hydrogen.
ο They may also contain impurities like sulphur,
nitrogen, oxygen, & metals.
ο Another name for hydrocarbon is petroleum.
Element
Carbon
Composition (% by mass)
84 β 87%
Hydrogen
11 β 14%
Sulphur
0.6 β 8%
Nitrogen
0.02 β 1.7%
Oxygen
0.08 β 1.8%
Metals
0 β 0.14%
61. Classes of Hydrocarbon
ο Paraffins
ο Saturated hydrocarbons
ο CnH2n+2
ο Examples are methane (CH4) & ethane (C2H6).
ο Naphthenes
ο Saturated hydrocarbons with a ring structure.
ο CnH2n
ο Example is cyclopentane (C5H10).
ο Aromatic
ο Unsaturated hydrocarbons with one or more carbon rings.
ο Example is benzene (C6H6).
62. Major Impurities & Their Sources
ο H2 β volcanic activity releases & radioactivity.
ο N2 β atmospheric; carried by run of water.
ο CO2 β since hydrocarbon is a covalent bond, ions
released can combine to form CO2.
ο H2S β free sulphur plus hydrogen.
ο He β radioactivity from volcanic activity.
ο S β free sulphur.
63. Effects of Major Impurities
ο H2 β reduces gas combustibility. Forms water.
ο N2 β affects Energy output per unit volume.
ο CO2 β negligible effect.
ο H2S β causes bronchi constriction.
ο He β negligible effect.
ο S β causes coking & plugging, increases power
consumption in refinery cost, reduces crude oil value.
64. Fluid Classifications
Phase
No surface liquids
Wet gas
> 100,000
Condensate
3,000 β 100,000
Volatile oil
1,500 β 3,000
Black oil
100 β 1,500
Heavy oil
Liquid
Separator GOR (SCF/STB)
Dry gas
Gas
Fluid Type
0
ο Also, natural gas can be classified by quality:
ο Sweet gas β little or no H2S present in the gas.
ο Sour gas β appreciable amount of H2S present in the gas.
65. Density of Crude Oil
O
API ο½
141.5
ο 131.5
S .G.@60 o F
O
Baume ο½
140
ο 130
S .G.@60 o F
ο Degree API is widely used.
ο 10 β 20 oAPI βΊ Heavy crude.
ο 20 β 30 oAPI βΊ Medium crude.
ο 30 β 40 oAPI βΊ Light crude.
ο > 40 oAPI βΊ Very light crude and condensate
67. Uses of Hydrocarbons
ο Energy β to run internal combustion (IC) engines.
ο IC engines are found in
automobiles, ships, tractors, generators, & armoured
tanks.
ο Raw materials β used as raw materials in
manufacturing of many products.
81. ο Disadvantages of fossil energy
ο Non-renewable β limited.
ο Pollution β emission (carbon based) from burning fossil
fuel reacts with oxygen & nitrogen in the atmosphere to
form Greenhouse gases (CO2, CO, NOx), leading to
Global warming.
ο These gases trap the solar energy reflected by the earthβs
surface and reradiate the energy in the form of infrared
radiation.
ο Carbon sequestration is a means of capturing &
storing greenhouse gases in geologic formations.