Regan Brown
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel designed for diesel engines. It is a distillate fuel oil, derived from the fractional distillation of petroleum fuel oil or biomass materials. Diesel engines are used in freight and delivery trucks, trains, buses, boats, farm vehicles, and some cars, among other applications. In this text, we will explore the question: is diesel fuel a material of trade?
| Characteristics | Values |
|---|---|
| Official term | Diesel fuel oil, heavy oil, biodiesel, distillate fuel oil |
| Origin | Experiments by Rudolf Diesel for his compression-ignition engine in 1892 |
| Raw material | Crude oil, biomass materials, vegetable seed oil, shale oil, peanut oil, illuminating gas |
| Use | Fuel for diesel engines, non-diesel engines, generators, boilers, steam engines, etc. |
| Standard | EN 590 in the European Union |
| Refining process | Cracking heavier fractions, hydrocracking, Fischer-Tropsch process |
| Sulphur content | Ultra-low-sulfur diesel (ULSD) with 15 parts per million or less |
| Production | U.S. petroleum refineries produce 11-12 gallons of diesel fuel from each 42-gallon barrel of crude oil |
| Transport | Pipelines, barges, trains, trucks |
| Testing | Quality tested to meet specifications before entering and leaving pipelines |
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What You'll Learn
Diesel fuel's origin and development
Diesel fuel is derived from crude oil, which is extracted from the ground through wells and offshore rigs. The crude oil is sent to refineries, where it is turned into gasoline, diesel, kerosene, and other extracts. The first oil refinery was built in 1851 in Scotland and used primarily to extract paraffin for oil lamps. Kerosene was a common byproduct that replaced paraffin. Diesel was also a common byproduct but was frequently discarded because there was no use for it.
The diesel engine and diesel fuel are named after Rudolf Diesel, a German scientist and inventor. Rudolf Diesel designed the first engine capable of using diesel fuel. He patented his original design in 1892, and the first diesel engines were made in the late 1800s. Diesel fuel was a revolution because it was the first fuel that didn't need to be externally ignited. The diesel engine design, which is still used today, compresses the liquid to extreme pressures to cause it to ignite. The combustion moves the piston and causes the motor to activate.
Rudolf Diesel's engine underwent much development after his death and became a very important replacement for the steam piston engine in many applications. The diesel engine became widespread in many applications, such as stationary engines, agricultural machines, submarines, ships, locomotives, trucks, and modern automobiles. Diesel engines have the benefit of running more fuel-efficiently than any other internal combustion engines suited for motor vehicles.
In the 1930s, the development of high-performance, high-speed diesel engines for cars and lorries meant that a proper fuel specifically designed for such engines was needed: diesel fuel. To ensure consistent quality, diesel fuel is standardized; the first standards were introduced after World War II. Diesel fuel standards define certain properties of the fuel, such as cetane number, density, flashpoint, sulfur content, or biodiesel content.
In 2006, the U.S. Environmental Protection Agency issued requirements to reduce the sulfur content of diesel fuel sold in the United States due to health concerns. The majority of diesel fuel sold in the United States today is ultra-low-sulfur diesel (ULSD), which has a sulfur content of 15 parts per million or less.
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Diesel engines and their uses
Rudolf Diesel invented the diesel engine in 1892. He originally designed the engine to run on coal dust, but soon began experimenting with vegetable oil, which contributed to the development of biodiesel. Diesel engines are a type of internal combustion engine in which fuel ignition occurs as a result of air compression and fuel injection, without the need for a spark.
Diesel engines are used in a wide range of vehicles, including freight and delivery trucks, trains, buses, boats, barges, and farm, construction, and military vehicles. They are also used in some cars, although they are more commonly found in larger vehicles due to weight and cost considerations. In Europe, diesel engines have been used in smaller cars such as superminis since the 1980s. Diesel engines are well-suited for demanding construction work, such as lifting steel beams, digging foundations, and drilling wells.
The diesel engine's ability to combust a wide range of fuels, including fuel oils, biodiesel, and vegetable oils, gives it an advantage over petrol engines. Biodiesel, in particular, is an attractive option due to its ease of synthesis and the fact that it is non-petroleum-based. Diesel engines are also known for their fuel efficiency, with diesel vehicles able to travel up to 35% further on a single gallon of fuel compared to similar-sized gasoline vehicles. They also have fewer parts than gasoline engines, reducing the need for maintenance and repairs.
Diesel fuel is widely used in the transportation sector, with diesel engines helping to transport almost all of the products consumed. In 2022, diesel fuel consumption in the U.S. transportation sector was about 2.98 million barrels per day, accounting for about 75% of total U.S. distillate consumption. Diesel fuel is also used in diesel-engine generators to provide electricity in remote locations, such as villages in Alaska, and as a backup power source for industrial facilities, hospitals, and electric utilities.
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Diesel fuel's composition and refinement
Diesel fuel is a mixture of hydrocarbons obtained by distillation of crude oil. It is specifically designed for use in a diesel engine, a type of internal combustion engine where fuel ignition occurs without a spark due to the compression of inlet air and the subsequent injection of fuel. Diesel fuel typically has a higher density than gasoline, requiring higher compression and temperatures to ignite spontaneously. This process, known as compression ignition, is fundamental to the functioning of diesel engines.
The chemical composition of diesel fuel significantly impacts engine performance. It generally consists of heavier and less volatile hydrocarbons compared to gasoline, which contributes to its higher density. Diesel fuel is composed of about 86.1% carbon, resulting in a net heating value of 43.1 MJ/kg, slightly lower than gasoline's 43.2 MJ/kg. The combustion efficiency and fuel consumption of diesel engines are influenced by its chemical composition.
Diesel fuel can be categorised into several types, including straight-run diesel, diesel fuel No. 1, diesel fuel No. 2, and diesel fuel No. 4. Straight-run diesel is often insufficient in supply and quality, so other sources, such as cracking heavier fractions using visbreaking and coking, are blended in. Diesel fuel No. 1, also known as kerosene, consists of hydrocarbons with carbon numbers predominantly ranging from C9 to C16 and boiling temperatures of approximately 150-300°C. Diesel fuel No. 2, manufactured in the USA, is a blend of straight-run and catalytically cracked streams, including straight-run kerosene and various distillates. Diesel fuel No. 4, also known as marine diesel fuel, is the most viscous type and contains higher levels of ash and sulfur.
The refinement of diesel fuel has undergone significant changes over time, particularly in reducing sulfur content to meet emission standards. Modern refining processes can be classified into three categories: separation, conversion, and upgrading. Separation involves distilling crude oil into components based on physical properties, particularly boiling temperature. Conversion processes, such as catalytic cracking and hydrocracking, break down large hydrocarbon molecules into smaller ones. Upgrading processes, such as hydrotreating, remove undesired compounds, including sulfur and nitrogen, improving the fuel's quality.
The performance of diesel engines has been enhanced through various technical developments. These include the introduction of electronic control systems, the use of electronically controlled direct injection, variable geometry turbochargers, and advancements in fuel injection control systems. These innovations have narrowed the performance gap between diesel engines and Otto cycle engines, making diesel engines more versatile and suitable for a broader range of applications.
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Diesel fuel's distribution and transportation
Diesel fuel is a crucial component of the global fuel supply chain, facilitating transportation and powering various vehicles and machinery. The distribution and transportation of diesel fuel involve a complex network of infrastructure, including pipelines, barges, trains, and trucks.
Pipelines play a central role in the transportation of diesel fuel, connecting refineries and ports to terminals near major consumption areas. This method offers reliability and consistent delivery schedules, ensuring uninterrupted supply. Diesel fuel is often transported in batches through shared pipelines with other petroleum products, requiring quality testing to meet specifications.
Barges, including river barges and ocean-going vessels, are instrumental in transporting diesel fuel, especially in regions with extensive waterways or coastal areas. They offer a cost-effective and environmentally friendly solution, reducing road congestion and carbon emissions associated with fuel delivery. Barges are well-suited for carrying bulk quantities of liquid fuels, such as diesel, gasoline, and heating oil.
Trucks, specifically tank trucks, are essential for short-distance transportation, connecting distribution centres with retail outlets and delivering fuel directly to customers in remote locations. These specialised vehicles feature cylindrical tanks designed to transport smaller quantities of fuel over road networks, providing flexibility and responsiveness in meeting fluctuating demand.
Additionally, trains are utilised to transport diesel fuel to terminals, contributing to the overall distribution network. Diesel fuel distribution aims to cater to diverse driving conditions and fuel requirements, including non-ethanol gasoline and dyed diesel for specific industries and applications, such as refrigeration and generators.
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Diesel fuel's alternatives
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel designed for diesel engines, which are a type of internal combustion engine. Rudolf Diesel, a German scientist and inventor, created the first diesel engine prototype around 1892. He experimented with various fuels, including vegetable seed oil, which contributed to the development of biodiesel.
Diesel Fuel Alternatives:
Biodiesel:
Biodiesel is a popular alternative to diesel fuel and is derived from biomass materials or vegetable oils. It is produced from renewable sources, such as vegetable oils or animal fats, and can be used in diesel engines with some modifications. Biodiesel has the potential to reduce carbon dioxide emissions compared to conventional diesel. However, it is important to ensure proper filtering and processing of biodiesel to avoid engine issues.
Vegetable Oil:
Vegetable oil, such as filtered veggie oil or recycled cooking oil, can be used as a cheap alternative in older diesel engines. However, it requires proper filtering and processing to prevent damage to fuel systems.
Synthetic Diesel:
Synthetic diesel can be produced from various carbonaceous precursors, with natural gas being the most important. The raw materials are converted into synthesis gas, which is then transformed into synthetic diesel through processes like the Fischer-Tropsch process. Synthetic diesel often has low sulfur content and can be blended with petroleum-derived diesel.
Natural Gas:
Natural gas is a domestically abundant fuel that offers significant cost advantages over diesel. It is considered an alternative fuel and can be used in fuel cell electric vehicles, providing a potentially emissions-free option.
Other Alternatives:
Other alternatives to diesel fuel include propane, a widely used gaseous fuel, and hydrogen, which can be produced from renewable resources for use in fuel cell electric vehicles. Additionally, sustainable aviation fuel derived from renewable feedstocks and ultra-low-sulfur diesel (ULSD) are also alternatives. ULSD has substantially lowered sulfur content and is commonly used in the United Kingdom, Europe, and North America.
The adoption of alternative fuels considers various factors, including engine compatibility, distribution infrastructure, and environmental impact. While some alternatives have been explored, a technically and commercially feasible replacement for diesel fuel has not yet been widely adopted.
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Frequently asked questions
Diesel fuel is any liquid fuel designed for use in a diesel engine, which is a type of internal combustion engine. Diesel fuel is commonly used in heavy trucks, freight and delivery trucks, trains, buses, boats, and military vehicles.
Yes, diesel fuel is a material of trade. It is a high-volume product of oil refineries and is traded and transported in large quantities via pipelines, barges, trains, and trucks.
Diesel fuel is primarily refined from crude oil at petroleum refineries. However, alternative sources are also being developed, such as biodiesel, biomass-to-liquid (BTL), and gas-to-liquid (GTL) diesel.
