The Impact of EGR Technology on the Performance and Emissions of n-Butanol/Diesel Engines

This study uses A VL_ FIRE software to simulate the combustion chamber of n-butanol and diesel blended fuel in a 4190ZLC-2 medium-speed diesel engine. It investigates the effects of n-butanol blending ratios (0%, 10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup>, 20%, 30<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup>) and EGR rates (0%, 10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup>) on engine combustion performance and emission characteristics. Simulation results indicate that increasing the n-butanol blending ratio effectively reduces CO emissions, though NO generation increases. Introducing 10% EGR significantly lowers the mass generation of both, benefiting marine environmental protection. However, this results in decreased in-cylinder pressure and temperature, impacting the engine's power performance. This research provides a scientific basis for the use of n-butanol blended fuel in marine diesel engines and offers references for emission reduction using EGR technology in practical applications.