Regan Brown
Fossil fuels are a class of hydrocarbon-containing materials of biological origin occurring within Earth’s crust that can be used as a source of energy. They are formed from the buried remains of prehistoric organisms such as animals, plants, or microplankton. The two engines that use fossil fuels are internal combustion engines and steam engines. Internal combustion engines are used in cars, aircraft, and boats, while steam engines were integral to the Industrial Revolution.
| Characteristics | Values |
|---|---|
| Engine Type | Internal combustion engines |
| Fuel Type | Fossil fuels, including coal, petroleum, natural gas, oil shales, bitumens, tar sands, heavy oils, diesel, and gasoline |
| Use | Powering vehicles (automobiles, trucks), ships, aircraft, generating electricity, industrial processes, cooking, heating, lighting |
| Environmental Impact | Air pollution, emission of greenhouse gases (CO2), contributing to climate change, acid rain, release of radioactive materials |
| Alternatives | Renewable fuels (biodiesel, bioethanol, hydrogen), electric vehicles, wind and solar power |
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What You'll Learn
Internal combustion engines (ICEs)
An internal combustion engine (ICE) is a heat engine that uses the combustion of fossil fuels with an oxidizer, usually air, to generate power. The combustion of fuel occurs within the engine itself, in a combustion chamber, which is an integral part of the working fluid flow circuit. The expansion of high-temperature and high-pressure gases produced by combustion applies direct force to components of the engine, such as pistons, turbine blades, a rotor, or a nozzle. This force moves the component over a distance, transforming chemical energy into kinetic energy, which is used to propel or power the attached machinery.
ICEs are typically powered by hydrocarbon-based fossil fuels, including natural gas, gasoline, diesel fuel, and ethanol. The combustion process results in the production of thermal energy, steam, carbon dioxide, and other chemicals at very high temperatures. The temperature reached depends on the chemical makeup of the fuel and oxidizers, as well as compression and other factors. The combustion process releases harmful emissions, including nitrogen oxides (NOx), particulate matter (PM), carbon dioxide, water, and soot.
There are two main types of ICEs: spark ignition gasoline engines and compression ignition diesel engines. Most of these engines are four-stroke cycle engines, which require four piston strokes to complete a cycle, including intake, compression, combustion, power stroke, and exhaust. ICEs are commonly used in vehicles such as cars, aircraft, and boats, as well as in power generation. They offer superior storability, transportability, and the supply of liquid fuel with high energy density.
The first commercially successful ICEs were invented in the mid-19th century, and the first modern ICE, the Otto engine, was designed in 1876 by German engineer Nicolaus Otto. Over the years, research and development have helped reduce ICE emissions and improve performance and efficiency. However, ICEs have also contributed to environmental concerns, such as energy resource depletion and climate change.
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Steam engines
A single large steam engine could power entire factories via transmission belts and shafts. James Watt's invention, the centrifugal governor, was instrumental in regulating the rotational speed of steam engines, thereby maintaining a constant output independent of the load. This device used a system of levers to adjust the steam valve opening based on the measured speed, allowing steam to be fed to the engine in proportion to the speed discrepancy.
Over time, some steam locomotives were converted from burning coal to using oil as a fuel source. This transition offered advantages in terms of efficiency and consistency in steam generation. Oil burners were also preferred due to their reduced risk of setting the surrounding areas ablaze. However, burning lighter oil fuel resulted in smaller, more concentrated combustions, which could lead to thermal stresses and oxidation damage to materials.
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Diesel engines
During his initial experiments, Diesel used a variety of fuels, including crude oil, petrol, kerosene, lamp oil, and coal tar creosote. He even tested a coal-dust prototype, but it suffered from piston ring failure due to coal dust deposition. Over time, diesel engines typically ran on cheap fuel oils, with petroleum-derived diesel becoming the standard. Before 2006, diesel fuel sold in the United States had high sulfur content, which produced air pollution and was harmful to human health.
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Gasoline engines
The combustion process in gasoline engines produces a large amount of thermal energy, as well as steam, carbon dioxide, and other chemicals at very high temperatures. This combustion process contributes to air pollution and human-induced climate change due to the emission of carbon dioxide, nitrogen oxides, soot, and uncombusted hydrocarbons.
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Hydrogen engines
The development of hydrogen internal combustion engines has gained momentum in recent years, particularly for heavy-duty commercial vehicles. Companies like Cummins, Inc. are leading the way towards a new era in power by leveraging their expertise to create scalable hydrogen engine solutions. Their hydrogen engines share many similar components with diesel engines, making them an efficient, familiar, and scalable alternative.
Despite the advantages of hydrogen engines, it is important to note that hydrogen combustion still produces byproducts. While pure hydrogen gas contains no carbon, impurities in the fuel and hydrocarbons in the engine lubricant can result in CO2 emissions. Additionally, hydrogen combustion can produce oxides of nitrogen (NOx) and N2O, which are potent greenhouse gases.
In conclusion, hydrogen engines hold promise as a more sustainable alternative to traditional fossil fuel engines. With their similar operational and maintenance costs, quick refuelling times, and zero-emissions potential, they can play a crucial role in reducing environmental impact and achieving climate goals. However, it is essential to address the byproducts and emissions associated with hydrogen combustion to ensure a truly sustainable solution.
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