APES 6.3 Fuel Types and Uses
Enduring Understanding:
- Humans use energy from a variety of sources, resulting in positive and negative consequences.
Learning Objective:
- Identify types of fuels and their uses.
Essential Knowledge:
- Wood is commonly used as fuel in the forms of firewood or charcoal.
- It is often used in developing countries because it is easily accessible.
- Peat is partially decomposed organic material that can be burned for fuel.
- Three types of coal used for fuel are lignite, bituminous, and anthracite.
- Heat, pressure, and depth of burial contribute to the development of various coal types and their qualities.
- Natural gas, the cleanest of the fossil fuels, is mostly methane.
- Crude oil can be recovered for tar sands, which are a combination of clay, sand, water, and bitumen.
- Fossil fuels can be made into specific fuel types for specialized uses (e.g., in motor vehicles)
- Cogeneration occurs when a fuel source is used to generate both useful heat and electricity.
Wood and Charcoal
- Primarily used in developing countries
- One of the oldest methods of energy production
- Used ever since humans first started making fires
- Charcoal is made from wood, and requires some processing/more steps
- The benefit, however, is that it burns hotter
- Readily accessible and renewable if used sustainably
- The removal of trees for energy can cause soil erosion
- This then leads to food security issues
- Deforestation can decrease the amount of precipitation and CO2 sequestration
Peat
- Partially decomposed organic material that can be burned as fuel
- Would eventually turn into coal if given enough heat, time, and pressure
- Using these fuels inside without proper ventilation can cause indoor air pollution and health problems
Coal
- Peat turns into lignite coal
- This has a low heat capacity, low sulfur, and high moisture content
- Least valuable, is not as concentrated as the other types of coal
- Has many impurities and moisture so will produce smoke
- Lignite turns into bituminous coal
- Most commonly used, high heat capacity, high sulfur
- Will release the most sulfur into the atmosphere (pollution, can cause acid deposition when mixed with water)
- Bituminous turns into anthracite coal
- Best quality, high heat capacity, low sulfur content
- Takes the longest to make
- Has the least amount of impurities
- All coals will release impurities but some have less than others
Natural Gas
- The cleanest fossil fuel
- It doesn’t release much emissions
- Very little sulfur, mercury, lead, etc.
- It still produces CO2, just not other impurities
- This is mostly methane
- Natural gas is very light and is very easy to transport/distribute
- Doesn’t need to go through tankers, warehouses, trains, etc.
- Escape from pipes can be a concern, however
Oil
- Crude oil can be extracted from tar sands, which are a combination of clay, sand, water, and bitumen
- Tar sands are not an ideal method of sourcing oil, but because other sources are being depleted we have to turn to this
- We have to remove many other things in the sand to get to the oil which costs time, energy, and money
Refined Crude Oil
- Crude oil and other fossil fuels can be made into specific types of fuels for specialized uses
- Such as gasoline, diesel, jet fuel, heating oil, etc.
- Refineries are the location where this is done, and take advantage of different boiling points to make different fuels
Cogeneration
- Occurs when a fuel source is used to generate both useful heat and electricity
- The heat that may be a byproduct of the electrical energy production can be used in other areas such as heating homes or water
- This is more efficient, using all parts of the energy instead of letting the heat just dissipate into the world