Sylvie Willis
Jet fuel and diesel are both types of fuel with different compositions and applications. Jet fuel is a specific type of aviation turbine fuel, while diesel fuel is designed for diesel engines. While jet fuel is considered to be a high-sulfur fuel, diesel fuel contains higher concentrations of impurities. The main difference between the two is their lubricity, with jet fuel being 'drier' than diesel fuel. Diesel engines are typically heavier than their gasoline equivalents due to the strength requirements of compression engine cycles. This inherent weight penalty also applies to piston engine-powered aircraft that use diesel fuel.
| Characteristics | Values |
|---|---|
| Lubricity | Jet fuel is 'dry' and has high sulfur content. Diesel fuel has lubricating properties and requires lubricity additives. |
| Viscosity | Jet fuel and diesel fuel can be made with the same viscosity, but in practice, they are made with different viscosities for their respective engines. |
| Composition | Jet fuel and diesel fuel have historically been similar in composition, but have diverged over time. Jet fuel is refined at higher temperatures, removing sulfur compounds. |
| Extraction | Jet fuel and diesel fuel have historically been similar in extraction, but have diverged over time. |
| Application | Jet fuel is used in aviation gas-turbine engines. Diesel fuel is designed for diesel piston engines and is not suitable for the wide temperature extremes needed in aviation. |
| Power-to-mass ratio | Diesel engines are typically heavier than their gasoline equivalents, which is a disadvantage for aircraft. |
| Energy content | Diesel fuel has higher energy content per gallon than jet fuel. |
| Volatility | Jet fuel has higher volatility than diesel fuel. |
| Octane numbers | Jet fuel and diesel fuel have low octane numbers (15-25) and tend to ignite easily from high compression. |
| Cetane numbers | Diesel fuel has a higher cetane number than jet fuel. |
| Environmental impact | Diesel engines generally produce more nitrogen oxides and sulfur compounds than jet fuel or gasoline engines. However, diesel engines have lower CO2 emissions. |
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What You'll Learn
Jet fuel has higher sulphur content than diesel
Jet fuel and diesel fuel have more in common than one might think. Historically, jet fuel and diesel were quite similar in extraction, production, composition, and even their application. However, jet fuel has higher sulphur content than diesel.
Jet fuel, especially Jet-A type, is considered a relatively high-sulphur fuel. Jet fuel has a sulphur content of about 3000 ppm, while on-road diesel contains around 500 ppm. The higher sulphur content in jet fuel forms extra sulphur dioxide, an acid gas. This can cause problems for engines with exhaust gas recirculation (EGR) systems, as the extra sulphur dioxide is recirculated in these engines.
The higher sulphur content in jet fuel is due to the refining process. Jet fuel is refined at higher temperatures, which removes the sulphur compounds and provides a more uniform set of carbon molecules. This results in jet fuel being an extremely high-quality diesel fuel. However, the removal of sulphur compounds also reduces the lubricating properties of the fuel, which can affect the proper functioning of fuel injectors, pumps, and other mechanical components.
Diesel fuel, on the other hand, contains higher concentrations of impurities and has lubricating properties that are essential for the proper functioning of diesel engines. Lubricity additives are often added to diesel fuel to enhance its lubricity and protect the engine from wear and tear.
While jet fuel has higher sulphur content than diesel, it is important to note that both fuels have relatively low octane numbers, typically around 15-25. This means that they can ignite easily from high compression and are not suitable for use in gasoline engines, as it can quickly destroy them.
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Diesel engines are heavier than gasoline equivalents
While jet fuel and diesel fuel have a lot in common in terms of extraction, production, composition, and application, there are some key differences between the two. One of the main differences is that jet fuel is typically "dryer" than diesel fuel, with a higher sulfur content. Diesel fuel, on the other hand, tends to have higher lubricity, which is essential for the proper functioning of diesel engines. Additionally, diesel engines often require technical additives to maintain the longevity of the powertrain.
When it comes to the weight comparison between jet fuel and diesel, it is important to note that diesel fuel is considered a heavy fuel, along with jet fuel. However, the specific weights of these fuels are not commonly discussed. Instead, the focus is often on their energy content and efficiency. Diesel fuel is known to have higher energy content per volume compared to gasoline, with a gallon of diesel containing approximately 10% more energy than a gallon of gas. This makes diesel engines more fuel-efficient than spark-ignition engines, with a fuel efficiency improvement of about 30%.
Now, let's turn our attention to the statement, "Diesel engines are heavier than gasoline equivalents." This statement is indeed true. Diesel engines are generally heavier than their gasoline counterparts due to several factors. Firstly, the power-to-mass ratio of diesel engines is comparatively lower, which means that as the power output increases, so does the weight of the engine. This weight disadvantage is less crucial for ground transportation vehicles but becomes a significant factor for aircraft, where weight optimization is crucial.
The heavier nature of diesel engines can be attributed to their design and the requirements of diesel fuel. Diesel engines often have more robust and durable components to accommodate the higher compression ratios and ignition pressures associated with diesel fuel. Additionally, the injectors and other parts of diesel engines may require technical additives to ensure proper lubrication and long-term performance, which can contribute to the overall weight of the engine.
In contrast, gasoline engines operate on a different set of principles. Gasoline, also known as petrol, is a lighter fuel with higher volatility and knock resistance. Gasoline engines are designed to take advantage of these fuel properties, resulting in higher compression ratios and more efficient combustion. The lighter weight of gasoline also contributes to the overall weight reduction of the engine and the vehicle. However, it is important to note that the weight difference between diesel and gasoline engines may vary depending on the specific design, manufacturer, and intended use case.
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Jet fuel and diesel have similar extraction and production processes
Jet fuel and diesel fuel have more in common than one might assume, given their distinct names. Historically, jet fuel and diesel were quite similar in extraction and production. Both fuels are derived from crude oil through a refining process. This process involves heating the crude oil in a distillation column, causing different hydrocarbons to vaporize at different temperatures. The lighter hydrocarbons, such as gasoline, rise to the top, while heavier hydrocarbons, including jet fuel, settle at the bottom.
Jet fuel, also known as aviation turbine fuel (ATF or avtur), is a mixture of various hydrocarbons, specifically engineered for performance, safety, and efficiency in aircraft engines. The specific hydrocarbons found in jet fuel typically include alkanes (paraffins), cycloalkanes (naphthenes), and aromatic hydrocarbons. Additives may be included to improve certain properties or prevent engine wear.
Diesel fuel, on the other hand, is designed to power engines built specifically to run on diesel fuel, often found in vehicles such as trucks, buses, and generators. Diesel fuel can also be created by recombining shorter hydrocarbon chain distillates in specific proportions. Additives are often required in diesel engines, particularly lubricity additives, to ensure the correct functioning of the injector system.
While jet fuel and diesel fuel share similar extraction and production processes, their compositions, applications, and broader use have diverged over time. The main difference lies in their specific compositions and the types of engines they are designed for. Jet fuel is typically "drier" than diesel fuel, with a higher sulfur content, making it suitable for gas-turbine engines. Diesel fuel, in comparison, requires additives to maintain lubricity and viscosity specifications.
Additionally, jet fuel has a higher volatility and a lower freezing point than diesel fuel, with Jet A-1, for example, having a freezing point below -50°C (-58°F). The use of alternative fuels in aviation, such as biodiesel made from vegetable oil, is still in the research phase, while diesel fuel has been widely adopted for ground transportation.
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Jet fuel is 'dry' and has low lubricity
Jet fuel and diesel fuel have much in common, especially in terms of their extraction, production, composition, and application. However, there are some key differences between the two fuel types.
One notable difference is that jet fuel, particularly Jet-A, is considered "dry" compared to diesel fuel. Jet fuel has relatively high sulfur content, which contributes to its lubricity—a measure of a fuel's ability to lubricate engine components. Jet fuel's lubricity is acceptable for gas-turbine engines, whereas diesel fuel typically requires lubricity additives to prevent excessive wear and tear on engine components over time.
The introduction of Ultra-Low Sulfur Diesel (ULSD) has reduced the lubricating abilities of diesel fuel, necessitating the use of lubricity modifiers. In contrast, jet fuel's higher sulfur content, typically up to 1,000 ppm, allows it to maintain adequate lubricity without additives. However, the push for cleaner-burning fuels has led to the development of hydrotreated renewable jet fuels, which may have reduced sulfur content and, consequently, lower lubricity.
The lubricity of jet fuel is critical to its performance. If jet fuel is not adequately lubricating, it can lead to issues such as blocked fuel inlet pipes, as seen in the case of British Airways Flight 38. Water contamination in jet fuel can cause operational issues, as supercooled water droplets can freeze and obstruct fuel lines. Therefore, maintaining the appropriate lubricity of jet fuel is essential for safe and efficient aircraft operations.
In summary, jet fuel's dryness and low lubricity are relative to diesel fuel, which typically requires additives to enhance its lubricating properties. Jet fuel's higher sulfur content contributes to its lubricity, but the trend towards reducing sulfur in jet fuel may require future consideration of additive use to maintain adequate lubricity for engine functionality.
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Diesel has higher energy per gallon than jet fuel
Jet fuel and diesel fuel have a lot in common, including their extraction, production, composition, and application. However, there are some key differences between the two types of fuel. One of the main differences is that jet fuel has a higher sulphur content than diesel fuel. Diesel fuel also has higher energy per gallon than jet fuel.
Diesel fuel is designed and refined for use in diesel piston engines, and it contains higher concentrations of impurities. It also does not tolerate the wide temperature extremes needed in aviation. Jet fuel, on the other hand, is refined at higher temperatures, removing sulphur compounds and providing a more uniform set of carbon molecules. This makes jet fuel essentially a high-quality diesel fuel.
Diesel engines are typically heavier than their gasoline equivalents due to the strength requirements of compression engine cycles. They also require turbocharging to be effective power plants. Additionally, the use of diesel engines in planes has some advantages, such as a higher power-to-mass ratio. However, diesel aircraft engines are less common due to their heavy weight.
In terms of energy content, diesel fuel has higher energy per gallon than jet fuel. This means that a gallon of diesel fuel will provide more energy than a gallon of jet fuel. This is an important consideration when choosing the right type of fuel for a particular engine or application.
Overall, while jet fuel and diesel fuel have some similarities, they also have significant differences in their compositions and applications. Diesel fuel has higher energy per gallon than jet fuel, making it a preferred choice for certain types of engines and uses.
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Frequently asked questions
Jet fuel and diesel have a lot in common, but diesel engines are typically heavier than their gasoline equivalents. Jet fuel has higher sulfur content than diesel fuel, and diesel engines produce more nitrogen oxides and sulfur compounds, which are linked to asthma and breathing disorders.
Jet fuel is very 'dry' compared to diesel fuel, which has lubricating properties. Jet fuel is designed to power gas-turbine engines, while diesel fuel is designed for diesel engines.
While jet fuel can be used in diesel engines and vice versa, it is not ideal due to a lack of necessary additives.
Diesel engines are about 30% more fuel-efficient than spark-ignition engines. Diesel engines are also less polluting in terms of CO2 emissions.
Jet fuel has a higher energy content than diesel, and it burns more cleanly. It also has a higher flash point and a lower freezing point, making it safer for aviation.
