Rajan Wilcox
Diesel fuel, also known as diesel oil, is a distillate fuel oil designed for use in diesel engines, which are named after their inventor, Rudolf Diesel. Diesel engines are a type of internal combustion engine in which fuel ignition occurs as a result of air compression and fuel injection, rather than through the use of spark plugs. Diesel fuel is derived from crude oil through fractional distillation, and consists of hydrocarbons with carbon numbers predominantly in the range of C9-C20. It has a higher boiling range than gasoline, and a higher energy content per gallon, making it more economical.
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What You'll Learn
Diesel fuel is safer than petrol
Diesel fuel is a liquid fuel designed for use in diesel engines, which are a type of internal combustion engine. Diesel engines are generally more fuel-efficient than petrol engines, allowing diesel cars to cover more miles per litre of fuel than petrol cars. This efficiency means that, when comparing similar vehicles, diesel cars emit less CO2 than petrol cars.
However, diesel combustion produces a more complex mix of exhaust gases and chemicals, including harmful pollutants like nitrogen oxides (NOx) and microscopic soot particles, which can lead to breathing difficulties and health issues, particularly in cities. Diesel engines also produce more torque (or pulling power) than petrol engines, making them good for towing or carrying heavy loads.
Despite these advantages, diesel fuel has received negative publicity due to the amount of toxic emissions it produces. Diesel engines produce fine particulate matter (PM) that can cause cancer and acute respiratory issues. In addition, diesel engines can produce more nitrogen dioxide, a toxic gas.
However, modern diesel engines feature particulate filters that can capture up to 99% of these harmful particles. Diesel fuel also has practical advantages, such as being less prone to price fluctuations than petrol and having better longevity due to its ruggedness and fewer engine parts.
In terms of safety, diesel fuel has a higher flash point than petrol, which makes it safer. The flash point of a fuel is the minimum temperature at which it gives off enough vapour to form a flammable mixture with air. Diesel fuel typically has a flash point between 52 and 96 °C, while conventional diesel fuels vaporise at temperatures between 149 °C and 371 °C.
While diesel fuel may have a reputation for being more polluting than petrol, the debate is multifaceted and depends on various factors such as CO2 emissions, particulate pollution, and journey types. Ultimately, the choice between diesel and petrol engines involves trade-offs, and each option has its pros and cons.
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Diesel engines are more durable and efficient
Diesel fuel is a distillate fuel oil designed for diesel engines, which are a type of internal combustion engine. Diesel engines are more durable and efficient than gasoline engines.
Firstly, diesel engines are more durable than gasoline engines. They tend to last longer, with reliable operation and minimal maintenance required. Diesel engines have fewer components, meaning fewer potential parts that could malfunction. They require fewer repairs and maintenance services, which saves money overall.
Secondly, diesel engines are more efficient than gasoline engines. They are 29% more efficient on the highway and 24% more efficient in the city. Diesel fuel simply packs more energy into every gallon than gasoline, making it more economical. Diesel cars also have more torque, which results in better fuel economy and acceleration.
Diesel engines do not have spark plugs but use extreme compression to generate the heat required for ignition. This makes diesel safer than gasoline, as it has a higher flash point. Gasoline is highly flammable and always gives off vapours that are ready to ignite, whereas diesel only ignites through direct contact with a flame.
Diesel fuel is derived from crude oil through fractional distillation. It consists mainly of aliphatic and aromatic hydrocarbons, with a boiling point range of 163–357 °C. It is a high-volume product of oil refineries, with an average of 11–12 gallons of diesel fuel produced from each 42-gallon barrel of crude oil.
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Diesel fuel is derived from crude oil
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel designed for use in diesel engines, which are a type of internal combustion engine. Diesel fuel is derived from crude oil through a process called fractional distillation. Crude oil is a naturally occurring liquid that can be refined into various fuels and other petroleum-based products.
The process of fractional distillation involves heating the viscous crude oil to over 400 degrees Celsius, turning it into a vapour. This vapour then rises through a distillation tower, where it begins to cool. As it cools, the hydrocarbon chains within the vapour return to a liquid state and are captured on distillation plates at different levels of the tower. The longest hydrocarbon chains have a boiling point above 400 degrees Celsius and emerge as asphalt or bitumen at the bottom of the tower. As the vapour continues to rise and cool, shorter hydrocarbon chains liquefy, with fuel oil emerging when the temperature drops below 370 degrees Celsius.
The specific distillate that becomes diesel fuel has a distillation range between 200 and 350 degrees Celsius. It consists of approximately 75% aliphatic hydrocarbons (C10H20 to C15H28) and about 25% aromatic hydrocarbons, such as benzene and styrene. The chemical formula for diesel fuel is often approximated as C nH 2n, where n represents the number of carbon atoms in the hydrocarbon chain, typically ranging from 9 to 25.
Diesel fuel derived from crude oil is commonly referred to as petroleum diesel or petrodiesel. While it is the most common type of diesel fuel, alternative sources that are not derived from petroleum, such as biodiesel, biomass-to-liquid (BTL), and gas-to-liquid (GTL) diesel, are gaining popularity. These alternative sources can include biomass, animal fat, biogas, natural gas, and coal liquefaction.
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Diesel fuel is used in non-diesel engines
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel specifically designed for diesel engines. Diesel engines are a type of internal combustion engine in which fuel ignition occurs without a spark as a result of inlet air compression and subsequent fuel injection.
Despite being designed for diesel engines, diesel fuel can also be used in several non-diesel engines, such as the Akroyd engine, the Stirling engine, or boilers for steam engines. Additionally, diesel is often the fuel of choice for heavy trucks and military vehicles. However, it is important to note that diesel exhaust, especially from older engines, can pose health risks.
The process of producing diesel fuel involves the distillation of crude oil, resulting in a complex mixture of hydrocarbons with carbon numbers predominantly in the range of C9–C20 and boiling points between 163–357°C. Diesel fuel is classified based on its intended engine type, ranging from 1-D to 4-D. The most common type of diesel fuel is a specific fractional distillate of petroleum fuel oil, but alternatives derived from non-petroleum sources, such as biodiesel, biomass-to-liquid (BTL), or gas-to-liquid (GTL) diesel, are gaining traction.
While diesel engines and gasoline engines differ significantly, it is technically possible to modify a diesel engine to run on gasoline. This, however, requires substantial engineering modifications to the engine's core, including the installation of spark plugs and adjustments to the compression ratio to prevent detonation.
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Diesel fuel is standardised
Diesel fuel is a liquid fuel designed for use in diesel engines, which are multifuel engines that can run on a wide range of fuels. The development of high-performance, high-speed diesel engines for cars and lorries in the 1930s meant that a specific fuel was needed: diesel fuel. Diesel fuel is produced from various sources, the most common being petroleum, but it can also be derived from biodiesel, biomass-to-liquid (BTL), or gas-to-liquid (GTL).
Diesel fuel standards were first introduced after World War II to ensure consistent quality. These standards define certain properties of the fuel, such as cetane number, density, flash point, sulphur content, and biodiesel content. The principal measure of diesel fuel quality is its cetane number, which indicates how readily the fuel ignites when sprayed into hot compressed air.
In the European Union, the standard for diesel fuel is EN 590, which defines the properties that diesel fuel must meet to be used in automobiles. This specification is also known as Ultra-Low Sulphur Diesel (ULSD) and requires diesel fuel to have a maximum sulphur content of 10ppm. As of 2016, almost all petroleum-based diesel fuel available in the United Kingdom, mainland Europe, and North America is of the ULSD type.
In the United States, the Environmental Protection Agency (EPA) regulates diesel fuel sulphur levels. Beginning in 2006, the EPA phased in stricter regulations to lower the amount of sulphur in diesel fuel to 15ppm. The EPA's diesel standards target emissions from both on-road and non-road diesel sources, reducing harmful emissions by more than 90%.
In the United Kingdom, the British Standard (BS) 2869 is the specification for fuel oil and gas oil used in heating applications and agricultural machinery. This specification has four grades, including Grade A2 Gas Oil, which refers to diesel fuel for off-road engines, and Grade D Gas Oil, which is used for heating applications and older power generators. Grade D Gas Oil is distinguished by its high sulphur content and red dye.
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Frequently asked questions
Diesel fuel is used to power diesel engines, which are a type of internal combustion engine. Diesel fuel is a high-energy, liquid fuel that is safer than petrol and offers better fuel efficiency.
Diesel fuel is derived from crude oil through fractional distillation. It is composed of hydrocarbons with carbon numbers predominantly in the range of C9-C20.
Petrol engines use spark plugs to ignite the fuel, whereas diesel engines use compression to generate the heat required for ignition. Diesel engines tend to be more durable, last longer, and require less maintenance than petrol engines.
Diesel fuel is safer than petrol as it has a higher flash point, which means it does not easily evaporate and ignite. However, diesel exhaust, especially from older engines, can cause health issues.
Diesel fuel offers better fuel economy and is more suitable for highway driving due to its higher energy content. Diesel engines also have fewer components, resulting in potential cost savings over the vehicle's lifetime.
