Ameer Randolph
Rudolf Diesel introduced his engine in 1900, and it ran on peanut oil. Since then, diesel engines have been modified to run on a byproduct of petroleum distillation, known as diesel fuel. However, diesel engines can still be converted to run on straight vegetable oil (SVO) or biodiesel. SVO refers to a range of materials, including animal fats and algae, in addition to vegetable oil. Biodiesel, on the other hand, is produced from waste vegetable oil (WVO) or virgin oil feedstock. While biodiesel can be used in diesel engines without modification, SVO requires heating to reduce its viscosity and surface tension.
Can you put vegetable oil in diesel fuel?
| Characteristics | Values |
|---|---|
| Is it possible? | Yes, diesel engines can run on straight vegetable oil or filtered waste vegetable oil. |
| Requirements | The vegetable oil must be extremely well-filtered and heated to reduce its viscosity. |
| Temperature | The engine should be at its highest possible operating temperature. |
| Fuel tank | A second fuel tank and a solenoid valve are often used to switch between diesel and vegetable oil. |
| Injectors | Vegetable oil can clog injectors, so it is recommended to switch back to diesel before reaching your destination to clean them out. |
| Storage | Vegetable oil has a longer storage life than diesel and can be used for fuel even after it goes rancid. |
| Cost | Converting to vegetable oil may be cost-effective, but there are risks of damaging the injection system. |
| Fuel source | Vegetable oil can be sourced from crops grown as fuel sources or recycled from waste cooking oil. |
| Emissions | Vegetable oil-based fuels have cleaner emissions and are theoretically carbon-neutral. |
| Sustainability | Using vegetable oil for fuel may contribute to rising food prices and competition between fuel and food sources. |
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What You'll Learn
- Diesel engines can run on straight vegetable oil (SVO) or waste vegetable oil (WVO)
- SVO viscosity must be similar to diesel for it to burn in a diesel engine
- SVO can be from virgin feedstock or recycled from used cooking oils
- Biodiesel can be made from WVOs or virgin oil feedstock
- Vegetable oil has been used as a diesel substitute since the 1930s
Diesel engines can run on straight vegetable oil (SVO) or waste vegetable oil (WVO)
SVO is a broad term, covering a range of materials beyond vegetable oil, including animal fats and algae. SVO can be sourced from virgin feedstock or recycled from used cooking oils (WVO). The viscosity of SVO must be lowered to be compatible with diesel engines, and this can be done by heating the oil or processing it. In colder climates, the vegetable oil fuel lines and tank often need to be heated to prevent the oil from solidifying.
WVO can be sourced from local restaurants and university cafeterias, and it can be recycled and produced locally, keeping potential waste out of sewers and landfills. However, it is important to note that WVO must be thoroughly filtered before use.
One common solution for using SVO/WVO in diesel engines is to add a heat exchanger and an additional fuel tank for diesel fuel. The engine is started on diesel and switched to vegetable oil once it is warmed up. Before shutting down the engine, it is switched back to diesel to clean out the injectors and fuel lines.
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SVO viscosity must be similar to diesel for it to burn in a diesel engine
Rudolf Diesel's original engine design in 1900 was fuelled by peanut oil. However, modern diesel engines are very different from the early prototypes. The use of injection pumps, high-pressure fuel systems, and various high-tolerance parts means that a less viscous fuel is required.
SVO will burn in a diesel engine, but only if its viscosity is similar to that of petro-diesel. Grease, for example, coagulates quickly and needs to be heated to liquefy again. Therefore, using SVO without modification can cause problems. To address this issue, you can either add a heating mechanism to the fuel line or tank, or process the oils.
Some engines are being retrofitted with equipment designed to be self-sufficient in heating the oil before injection. However, heating the oil is not always effective, as vegetable oils retain much of their viscosity even when heated to high temperatures.
Another option is to modify the oil by using biodiesel, which is made through a process called transesterification. This process uses lye to remove the coagulating properties of the oils. Biodiesel has a lower viscosity than SVO and can be used in diesel engines without any modifications.
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SVO can be from virgin feedstock or recycled from used cooking oils
Rudolf Diesel's original engine design from 1900 ran on peanut oil. However, the petroleum industry soon began using a byproduct of petroleum distillation to power the engine, coining the term "diesel fuel".
Today, diesel engines can be modified to run on straight vegetable oil (SVO) or pure plant oil (PPO). SVO is a broad term that covers a range of materials beyond vegetable oil, including animal fats, algae, and used cooking oils (WVO or waste vegetable oil).
SVO can be sourced from virgin feedstock, meaning crops grown specifically as a fuel source, or it can be recycled from used cooking oils. In 2000, the United States produced over 11 billion liters of recycled vegetable oil, mainly from industrial deep fryers in potato processing plants, snack food factories, and fast-food restaurants. Recycled vegetable oil can be used as a replacement for standard petroleum-derived fuels, reducing gasoline prices and preserving petroleum supplies. Additionally, biodiesel can be produced from WVOs collected from local restaurants and university cafeterias.
Using SVO in diesel engines requires reducing the viscosity and surface tension of the oil by preheating it. This can be achieved by adding a heat exchanger and an additional fuel tank for the petrodiesel or biodiesel blend, switching to the SVO tank once the engine is warmed up, and then switching back to diesel before shutting down the engine. This process prevents vegetable oil from remaining in the engine or fuel lines, as it can become very viscous and even solidify in colder climates.
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Biodiesel can be made from WVOs or virgin oil feedstock
Rudolf Diesel introduced his engine in 1900, and it ran on peanut oil. Soon after, the petroleum industry began using a byproduct of petroleum distillation to power the engine, which they called diesel fuel.
Today, diesel engines can run on straight vegetable oil (SVO) or filtered waste vegetable oil (WVO). However, SVO and WVO must be heated to reduce their viscosity and surface tension, which are otherwise too high for conventional compression-ignition engines. This can be achieved by preheating the oil using waste heat from the engine or electricity, or by adding a heat exchanger and an additional fuel tank for a petrodiesel or biodiesel blend.
While it is possible to convert diesel engines to run on vegetable oil, there are some drawbacks. For example, vegetable oil can gum up the engine if the glycerin is not removed, and it can also clog injectors if not switched back to diesel before reaching the destination. Additionally, there may not be enough waste oil available to run a significant portion of the diesel fleet, and using non-waste VO is energy-negative.
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Vegetable oil has been used as a diesel substitute since the 1930s
Rudolf Diesel introduced his engine in 1900 at the World's Fair in Paris, where it ran on peanut oil. Soon after, the petroleum industry began using a byproduct of petroleum distillation to power the engine, which they named diesel fuel. Diesel engines can run on straight vegetable oil (SVO) or filtered waste vegetable oil, but the viscosity of the oil (the thickness of the liquid) must be lowered to be compatible with conventional compression-ignition engines. This can be done by adding a heating mechanism to the fuel line or tank or by processing the oils.
Periodic petroleum shortages spurred research into vegetable oil as a diesel substitute during the 1930s and 1940s, and again in the 1970s and early 1980s when straight vegetable oil enjoyed its highest level of scientific interest. The 1970s also saw the formation of the first commercial enterprise to allow consumers to run straight vegetable oil in their automobiles, Elsbett of West Germany.
SVO is a broad term that covers a range of materials beyond vegetable oil, including animal fats and algae. It can be sourced from virgin feedstock or recycled from other uses, such as used cooking oils. One of the advantages of SVO and biodiesel over petrodiesel is that they are theoretically carbon-neutral and have cleaner emissions. However, growing crops for fuel has been associated with rising food prices and dangerous competition between fuel and food.
When using SVO, it is recommended to heat the engine to its highest possible operating temperature. Additionally, a second fuel tank and a solenoid valve are often used to switch from diesel to SVO once the desired temperature is reached. Before reaching the destination, it is necessary to switch back to diesel to clean out the injectors, as vegetable oil can clog them.
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Frequently asked questions
Yes, diesel engines can run on straight vegetable oil (SVO) or waste vegetable oil (WVO). However, the viscosity of the oil must be reduced by heating it, otherwise, it can cause problems with atomization, combustion, and carbonization.
Start the engine using diesel fuel. Once the engine is warmed up, switch over to vegetable oil. Before turning off the engine, switch back to diesel fuel to prevent vegetable oil from remaining in the engine or fuel lines.
SVO and biodiesel are theoretically carbon-neutral and have cleaner emissions than diesel fuel. WVO can be locally recycled and produced, reducing potential waste in sewers and landfills.
