Method to Operate High Substitution Rate Dual Fuel Engine from Low to High Loads

A new combustion control strategy developed at Oak Ridge National Laboratory enables high substitution of methanol in marine engines using conventional or renewable pilot fuels. This approach supports significant reductions in fuel use and criteria emissions without sacrificing performance, expanding fuel options for the marine industry.

Description

Methanol is an attractive alternative fuel for marine applications due to its environmental benefits and growing availability. However, its poor ignition characteristics in compression ignition engines have limited its adoption. Researchers at ORNL have developed a dual-fuel combustion strategy that enables high levels of methanol energy substitution—over 75% across a wide engine load range—by pairing methanol with a small amount of a pilot fuel. This strategy works with both traditional and renewable pilot fuels and maintains stable engine operation while achieving low emissions and high efficiency. The method leverages a unique combination of intake conditions, fuel injection timing, and pressure control to optimize combustion, all while preserving compatibility with existing engine platforms.

Benefits

• Enables high methanol fuel substitution across a wide range of engine loads
• Reduces reliance on petroleum-derived fuels, including full renewable configurations
• Maintains engine performance and combustion stability
• Supports compliance with evolving marine emissions regulations

Applications and Industries

• Marine transportation and shipping
• Retrofit and new-build marine diesel engine platforms

Contact

To learn more about this technology, email partnerships@ornl.gov or call 865-574-1051.