Regan Brown
Diesel fuel, also known as diesel oil, is a liquid fuel designed for use in diesel engines, which are internal combustion engines that use compression of inlet air and fuel injection to ignite without a spark. Diesel fuel is produced from various sources, most commonly through the distillation of petroleum fuel oil, but alternative sources such as biodiesel and biomass-to-liquid (BTL) are also used. The supply of diesel fuel involves extraction, refining, and distribution through pipelines, ships, trains, and trucks. In the United States, major crude oil sources include Texas, North Dakota, and Alaska, with Texas being the largest producer. The US also imports diesel from countries like Canada, Saudi Arabia, and Mexico to meet its demand. Diesel fuel systems play a crucial role in injecting precise amounts of atomized and pressurized fuel into engine cylinders, contributing to the overall performance and efficiency of diesel-powered vehicles.
| Characteristics | Values |
|---|---|
| Common names | Diesel oil, heavy oil, distillate, gas oil, Solar, petrodiesel |
| Origin | Experiments conducted by Rudolf Diesel for his compression-ignition engine in the 1890s |
| Sources | Petroleum refining, biomass-based diesel fuels (biodiesel, renewable diesel, biomass-to-liquid, gas-to-liquid diesel) |
| Production | Crude oil extraction, distillation, further processing to remove impurities |
| Distribution | Pipelines, ships, trains, trucks |
| Function | Inject precise amount of atomized and pressurized fuel into each engine cylinder at the proper time |
| Fuel Injectors | Most important fuel system component, deliver precise amount of atomized and pressurized fuel into each cylinder |
| Fuel Injection Methods | Individual pump and injector for each cylinder, combined pump and injector for each cylinder, one pump serving injectors for several cylinders, pumps in common housing with injectors for each cylinder |
| Fuel System Components | Fuel tanks, fuel lines, fuel filters, fuel transfer pumps |
| Fuel Volume Control | Slanted groove in the plunger, controlled by a mechanical governor |
| Fuel Quality | Must meet local, state, and federal specifications; U.S. diesel fuel has reduced sulfur content due to environmental regulations |
| U.S. Consumption | In 2022, total ULSD consumption for all uses was about 1.44 billion barrels (60.30 billion gallons) |
| U.S. Production | In 2022, U.S. refineries produced about 1.75 billion barrels (73.46 billion gallons) of ULSD |
| U.S. Imports | In 2022, the U.S. imported about 0.07 billion barrels (2.80 billion gallons) of ULSD, with Canada supplying nearly half |
| U.S. Reserves | Strategic Petroleum Reserve (SPR), government and private sector emergency stockpiles |
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What You'll Learn
Diesel fuel sources and refining
Diesel fuel is a distillate fuel oil used in motor vehicles with compression ignition engines, named after their inventor, Rudolf Diesel, who patented the design in 1892. Diesel fuel is generally refined from crude oil at petroleum refineries, although it can also be derived from biomass materials.
In the United States, refineries produce an average of 11 to 12 gallons of diesel fuel from each 42-gallon barrel of crude oil. The process of refining diesel fuel from crude oil involves distillation, where the fuel emerges as a vapour at temperatures between 200 and 350 degrees Celsius. The vapour collects on distillation plates and is siphoned off into a diesel holding tank. The distillation process extracts shorter hydrocarbon chains as it rises in the tower, with the shortest chains emerging at the top as a vapour. These shorter hydrocarbon chains can be recombined in specific proportions to create diesel fuel.
The most common type of diesel fuel is a fractional distillate of petroleum fuel oil, known as petrodiesel in academic circles. However, alternative diesel fuels that are not derived from petroleum, such as biodiesel, biomass-to-liquid (BTL), or gas-to-liquid (GTL) diesel, are becoming increasingly common. Biomass-based diesel fuels, including biodiesel and renewable diesel, contribute significantly to the diesel fuel supply. For instance, in 2022, U.S. refineries produced about 73.46 billion gallons of ultra-low-sulfur diesel (ULSD), with about 72% of imports originating from Canada.
Diesel fuel is often blended with other sources, such as cracked heavier fractions, to meet demand and quality standards. Synthetic diesel, produced from natural gas and other carbonaceous precursors, is another important source. This synthetic diesel is primarily composed of paraffins with low sulfur and aromatics content, and it is often blended into petroleum-derived diesel. To meet emission standards and taxation policies, the level of sulfur in diesel fuels has been significantly reduced over the years, particularly in the European Union and the United States.
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Distribution methods
Pipelines are the primary method of diesel distribution in the US. Diesel fuel and other petroleum products are transported through shared pipelines in batches. These batches are not physically separated, so some mixing may occur, requiring quality testing at either end. Major pipelines, such as the Colonial Pipeline and the Keystone Pipeline, transport diesel across vast distances, from refineries to regional distribution hubs.
Trucks and railroads complement pipeline distribution, especially in areas not served by pipelines. Trucks are flexible and can deliver diesel to remote locations, while rail transport is ideal for moving large quantities over long distances.
Key distribution hubs, such as those in Houston, Chicago, and New York, play a vital role in the diesel supply chain. These hubs ensure diesel is available where and when it is needed, serving as central points for storage and redistribution.
The US also relies on international imports, mainly from Canada and Saudi Arabia, to meet its diesel supply needs. These imports are transported by tanker across oceans and then distributed via pipelines and trucks once they reach the US.
Both the government and private sector maintain emergency stockpiles of diesel fuel, which are strategically located across the country. These reserves are crucial for ensuring diesel availability during crises, such as natural disasters or geopolitical events.
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Quality testing
Diesel fuel quality testing is a critical process that ensures the fuel's performance, efficiency, and longevity in engines. The quality of diesel fuel directly impacts its combustion speed and stability, affecting overall engine performance and equipment lifespan. Here are the key aspects of diesel fuel quality testing:
Combustion and Stability
Diesel fuel quality testing checks the combustion efficiency of the fuel. This involves measuring the fuel's ability to ignite and burn completely, ensuring maximum engine power and fuel efficiency. Poor combustion can lead to reduced engine performance, increased fuel consumption, and higher emissions of harmful pollutants.
Contaminant Testing
One of the primary focuses of diesel fuel quality testing is identifying contaminants. Common contaminants include water, microorganisms, debris, and sediment. Water can enter the fuel through condensation, leading to microbial contamination and freezing issues in fuel tanks and lines. Debris and sediment can include dirt, dust, sand, and similar particles, which can accumulate during storage and impact fuel function. Contaminants can cause equipment damage, reduced performance, and even equipment failure over time.
Cetane Number
The cetane number is a critical measurement in diesel fuel quality testing. It assesses the fuel's ignition quality during compression. A higher cetane number indicates smoother engine operation, easier cold starts, reduced noise, and lower emissions. The cetane number typically ranges from 40 to 55 and is crucial for meeting regulatory standards.
Sulfur Content
Testing for sulfur content is essential in diesel fuel quality testing. High sulfur content can impact emissions control, engine lubrication, and after-treatment systems. Low-sulfur diesel fuel prolongs the lifespan of emission control systems and ensures better engine performance by reducing harmful emissions.
Frequency of Testing
The frequency of diesel fuel quality testing depends on various factors, including storage duration, equipment sensitivity, and fuel source. Longer storage periods, seasonal variations, and high-performance engines may require more frequent testing. Regular testing is essential to catch issues early and ensure optimal performance, environmental responsibility, and equipment longevity.
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Environmental impact
Diesel fuel is a liquid fuel designed for use in diesel engines, which are internal combustion engines that compress inlet air and then inject fuel. Diesel fuel is a fractional distillate of petroleum fuel oil, although alternatives that are not derived from petroleum, such as biodiesel, biomass-to-liquid (BTL), and gas-to-liquid (GTL) diesel, are becoming more common. Diesel fuel is a high-volume product of oil refineries, and in 2022, U.S. refineries produced about 1.75 billion barrels (73.46 billion gallons) of ultra-low-sulfur distillate (ULSD).
The environmental impact of diesel fuel is significant. Diesel-fueled vehicles are major sources of harmful pollutants, such as ground-level ozone, particulate matter, and nitrogen compounds (NOx). These emissions contribute to air pollution and have negative effects on human health. Diesel exhaust can cause health damage, especially from older engines. The production of ground-level ozone by diesel engines damages crops, trees, and other vegetation, and also contributes to the formation of acid rain, which affects soil, lakes, and streams and enters the human food chain. Diesel fuel use also contributes to climate change by increasing greenhouse gas emissions, which impact air and water quality, weather patterns, sea levels, ecosystems, and agriculture.
To mitigate the environmental impact of diesel fuel, the U.S. Environmental Protection Agency (EPA) has established standards for the sulfur content of diesel fuel and emissions from new diesel engines. The EPA's fuel standards require a reduction in the sulfur content of diesel fuels, leading to the production of Ultra-Low-Sulfur Diesel (ULSD) fuel, which has a maximum sulfur concentration of 15 parts per million (ppm). ULSD fuel helps reduce emissions in older engines and, when used with advanced exhaust emission control systems, can reduce vehicle particulate emissions by up to 90% and nitrogen compound emissions by 25% to 50%.
Despite these efforts, diesel fuel use still contributes to air pollution due to the large number of older diesel engine vehicles in use. The slow turnover of trucks and off-road equipment means that pollution control agencies need to implement in-use programs to address existing emissions. New technologies, such as hybrids and fuel cells, show promise in reducing emissions from diesel-dominated sources. The Diesel Emissions Reduction Act of 2010 authorized grants and rebates for projects that reduce emissions from existing diesel engines, with up to $100 million annually allocated through 2024.
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Diesel fuel alternatives
Diesel fuel is a liquid fuel designed for use in a diesel engine, which is a type of internal combustion engine. Diesel fuel is produced from various sources, the most common being petroleum. However, there are several alternative fuels that can be used instead of diesel.
One alternative is vegetable oil, which can be used in older pre-electronic diesel engines. However, it is important to note that the oil must be filtered properly, or it can ruin the fuel system. Another alternative fuel is biodiesel, which is a type of biomass-based diesel fuel that is derived from vegetable oil. Biodiesel can also be produced from recycled cooking oil, although this method is less common.
Renewable diesel is another alternative to traditional diesel fuel. Renewable diesel is made from fats and oils, such as soybean oil or canola oil, and is processed to be chemically the same as petroleum diesel. It meets the ASTM D975 specification for petroleum in the United States, allowing it to be used in existing infrastructure and diesel engines. Renewable diesel has the added benefit of reducing carbon dioxide and nitrogen oxide emissions compared to petroleum diesel.
Hydrogen is another potential alternative fuel that can be used in fuel cell electric vehicles. Hydrogen can be produced from renewable resources and is emissions-free. Natural gas is also an alternative to diesel fuel, offering significant cost advantages over gasoline and diesel fuels. Additionally, propane is a widely used gaseous fuel that has been utilized in vehicles worldwide for decades.
It is important to note that alternative fuels may not always be compatible with newer diesel engines, which have tighter clearances in their fuel systems. Using alternative fuels in these engines can result in catastrophic failure of emissions systems. As such, older diesel engines, particularly those pre-2007, are better suited for running on alternative fuels.
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Frequently asked questions
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel designed for use in a diesel engine. The most common type of diesel fuel is a fractional distillate of petroleum fuel oil, but alternatives that are not derived from petroleum, such as biodiesel, are also available.
Diesel fuel is produced through a refining process of crude oil. This involves distillation, where crude oil is heated and separated into different components based on boiling points. Diesel is collected from the distillation column and further processed to remove impurities.
Diesel fuel is supplied to consumers through various methods, including pipelines, ships, trains, and trucks. In the United States, pipelines play a crucial role in distributing diesel fuel from refineries to regional hubs, while rail and truck transport complement this distribution, especially in remote areas.
The United States is a major producer and consumer of diesel fuel, with significant crude oil sources in Texas, North Dakota, and Alaska. However, the US also imports diesel fuel from international sources, with Canada, Saudi Arabia, and Mexico being key suppliers.
