Mercedes Mullins
The use of ethanol as an alternative fuel for diesel trucks has been a topic of interest for many years. While ethanol is typically considered a gasoline additive, advancements in engine technology have led to the development of diesel engines that can operate using ethanol as fuel. One notable example is the ClearFlame engine, which has demonstrated the ability to run on straight ethanol or E85 fuel with high ethanol content. This innovation addresses the challenge of reducing emissions from diesel engines, as ethanol offers a cleaner and more efficient alternative. However, there are concerns about the compatibility of ethanol with existing diesel engine designs, and the potential for higher fuel costs due to ethanol's lower energy density. As the ClearFlame engine technology continues to evolve, it has the potential to revolutionize the diesel industry by providing a cost-effective and environmentally friendly solution.
| Characteristics | Values |
|---|---|
| Can diesel trucks run on ethanol fuel? | Yes, ClearFlame Engines can run on ethanol. However, it is still in the demonstration phase of development. |
| Ethanol blends with diesel fuel | Blends of up to 15% ethanol in diesel fuel are called e-diesel and can be used in compression ignition engines. |
| Advantages of e-diesel | E-diesel can produce reductions in regulated diesel emissions, especially diesel particulate matter. It is also partially renewable. |
| Disadvantages of e-diesel | E-diesel has a low flash point, which may present a safety issue. It also has a lower energy density per gallon than gasoline. |
| Ethanol vs diesel | Ethanol burns more efficiently than diesel. |
| Cost savings | Using ethanol in a diesel engine could save the sector up to $2.5 billion in after-treatment costs. |
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What You'll Learn
Ethanol can reduce emissions and costs
Ethanol is a renewable fuel that can significantly reduce greenhouse gas emissions. The US Department of Energy's Argonne National Laboratory reports that grain-based ethanol reduces greenhouse gas emissions by 44 to 52% compared to gasoline. Similarly, researchers from Harvard, MIT, and Tufts University found that corn ethanol offers a 46% reduction in greenhouse gas emissions compared to gasoline.
The use of ethanol in gasoline in 2024 reduced CO2-equivalent greenhouse gas emissions from transportation by 54.3 million metric tons. This is equivalent to eliminating the emissions produced by consuming over 5.7 billion gallons of gasoline.
Ethanol can also replace toxic aromatic compounds in gasoline, making it a healthier option. Testing of 20 vehicles by the University of California, Riverside, in 2022, found that replacing E10 (gasoline blended with 10% ethanol) with E15 (gasoline containing 15% ethanol) resulted in lower emissions. These emissions benefits include reducing tailpipe pollution, which is harmful to human health.
Ethanol is considered a gasoline additive, and its application in diesel engines has been challenging due to the performance and simplicity of diesel engines being tied to their dirty emissions. However, ClearFlame Engines has developed a diesel engine that can burn straight ethanol, offering a 40% reduction in carbon emissions and a $45,000 cost savings. This engine has 30% more torque than engines running on diesel and does not require complex after-treatment systems, reducing overall engine costs.
The use of ethanol can also reduce the cost of after-treatment systems for diesel engines. The diesel sector spends about $3.3 billion annually on after-treatment, and using ethanol in diesel engines could save the sector $2.5 billion in these costs.
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ClearFlame engines can burn straight ethanol
ClearFlame Engines co-founders B.J. Johnson and Julie Blumreiter have developed a diesel engine that can burn straight ethanol. While concerns continue about the future of the Renewable Fuel Standard, Johnson said that even an optimistic 20% market penetration into the $231 billion heavy-duty diesel market would create 15 billion gallons of demand for ethanol per year. "Ethanol burns more efficiently than diesel," Johnson said. "Why has it not happened? Ethanol is considered a gasoline additive. The solution? Get ethanol to burn in a diesel application."
ClearFlame Engines has achieved a milestone in developing a heavy-duty truck engine that can run on straight ethanol. The company reported that the technology delivered 500 horsepower and more than 2,500 foot-pounds of torque, "while eliminating the need for additional after-treatment." ClearFlame's engine is the only option that provides both high performance and low emissions. The engine, still in the demonstration phase of development, can run on 98% ethanol straight off the rack or even on E85 as long as the fuel is close to 85% ethanol.
One of the biggest hurdles in gaining market access is educating the public about how ethanol can be used in ClearFlame's technology. The company has about two to three years of demonstrations to complete, starting in 2021. ClearFlame plans to scale up the technology in 2026 or 2027 and hopes to sign a license agreement with an engine manufacturer. The ClearFlame engine is the only diesel engine that would meet California regulations on reductions in nitrous oxide emissions, and ethanol would help the state accomplish that goal.
While ClearFlame's engine has many benefits, some farmers have expressed concerns about the use of ethanol in their equipment. One Reddit user pointed out that ethanol likes to dissolve rubber and other elastomers used to seal engine parts. They also questioned the efficiency and economy of ethanol compared to diesel, stating that if their farm equipment cannot do the same job with ethanol, they would stick to diesel.
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E-diesel blends can be used in compression ignition engines
The use of ethanol in diesel engines has been a topic of interest for some time, with ethanol being considered a gasoline additive. The challenge lies in getting diesel engines to burn ethanol, as their performance and simplicity are tied to their dirty emissions. However, ClearFlame Engines has developed a solution, creating an engine that can burn ethanol while still utilising the diesel engine design. This technology has the potential to significantly reduce carbon emissions and costs for the diesel sector.
ClearFlame's engine is unique in that it can run on 98% ethanol straight off the rack or even on E85 fuel with a high ethanol percentage. This engine has successfully passed torque and power tests, showcasing its ability to maintain performance while reducing emissions. The technology is still in the demonstration phase, with plans to scale up in the coming years.
Ethanol has clear economic benefits compared to diesel, as it eliminates the need for costly after-treatment systems to comply with emissions regulations. By replacing petroleum fuels with ethanol, ClearFlame's engine can reduce greenhouse gas emissions, particulate matter, and smog. This not only improves environmental sustainability but also reduces overall engine costs.
The use of E-diesel blends in compression ignition engines has been the subject of exhaust emissions testing by various test laboratories. These tests have evaluated engine performance under different conditions, including varying engine speeds, loads, and designs. The data from these tests provides valuable insights into the performance and emissions characteristics of E-diesel blends in compression ignition engines.
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Ethanol has a lower energy density than gasoline
Ethanol has emerged as a promising alternative to gasoline, with its potential to reduce carbon emissions and provide economic benefits. However, one of the challenges associated with ethanol is its lower energy density compared to gasoline. This means that ethanol contains less energy per gallon than gasoline. For instance, denatured ethanol, which consists of 98% ethanol, has approximately 30% less energy per gallon than gasoline.
The energy content of ethanol varies based on the volume percentage of ethanol in the blend. Typically, gasoline in the United States contains E10, which is a blend of 10% ethanol and 90% gasoline. This blend is commonly used to reduce air pollution. Higher ethanol blends, such as E85 (85% ethanol) or flex fuel, are also available for flexible fuel vehicles. However, the higher the ethanol content in the fuel, the lower the energy density.
The lower energy density of ethanol has implications for fuel economy. Ethanol's impact on fuel economy is dependent on both the ethanol content in the blend and the engine's optimization for gasoline or ethanol. Engines optimized for ethanol, such as the ClearFlame engine, can burn ethanol more efficiently and unlock its economic and environmental benefits. The ClearFlame engine, which is still in the demonstration phase, can run on 98% ethanol or E85.
While ethanol has a lower energy density than gasoline, it offers other advantages. Ethanol has a higher octane number than gasoline, which improves its blending properties. Additionally, ethanol is a renewable fuel produced from biomass, such as corn grain in the United States. The production of ethanol from corn has a positive energy balance, indicating that the energy required to produce ethanol is less than the energy contained in the fuel itself.
Moreover, cellulosic ethanol, produced from waste, coproducts, or dedicated crops with lower water and fertilizer requirements, further improves the energy balance of ethanol. It also results in lower levels of life cycle greenhouse gas emissions. Overall, while ethanol has a lower energy density than gasoline, its potential to reduce emissions and its positive energy balance make it a promising alternative fuel source.
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Ethanol is considered a gasoline additive
Ethanol is a renewable fuel made from plant materials known as biomass. It is colourless and is the same type of alcohol found in alcoholic drinks. Ethanol is often used as a motor fuel and is considered a gasoline additive.
In the United States, most finished motor gasoline is E10, which contains 10% ethanol and 90% gasoline. This reduces air pollution and increases fuel consumption in unmodified vehicles by a small amount when compared to conventional gasoline. The Clean Air Act requires the addition of oxygenates to gasoline to reduce carbon monoxide emissions. Ethanol is an attractive additive because the additive MTBE is being phased out due to groundwater contamination.
Ethanol has a higher octane number than gasoline, which provides premium blending properties. Lower-octane gasoline is blended with 10% ethanol to attain the standard 87 octane. However, ethanol contains less energy per gallon than gasoline, and ethanol's impact on fuel economy depends on the ethanol content in the fuel and whether the engine is optimised for gasoline or ethanol.
Ethanol is also available as E85 (or flex fuel), which can be used in flexible-fuel vehicles designed to operate on any blend of gasoline and ethanol up to 85% ethanol. E85 produces lower mileage than gasoline and requires more frequent refuelling.
Ethanol is also used in Brazil, where the government has made it mandatory to blend ethanol with gasoline since 1976. By 2011, Brazil had a fleet of 14.8 million flex-fuel automobiles and light trucks and 1.5 million flex-fuel motorcycles that regularly used neat ethanol fuel (known as E100).
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Frequently asked questions
Yes, ClearFlame Engines has developed a diesel engine that can run on ethanol. However, it is still in the demonstration phase of development.
Ethanol burns more efficiently than diesel, and it can help reduce carbon emissions by up to 40%. It also has economic benefits, as it can save the diesel sector about $2.5 billion in after-treatment costs.
Yes, one potential disadvantage is that ethanol has a very low flashpoint, which may present safety issues. Additionally, ethanol has a lower energy density per gallon than gasoline, which may result in lower fuel mileage.
E-diesel, or eDiesel, refers to blends of ethanol and diesel fuel, typically with up to 15% ethanol. It can be used in compression ignition engines and can help reduce diesel particulate matter emissions. However, there are concerns about its effect on NOx, CO, and HC emissions.
