The Effect of RME-1-Butanol Blends on Combustion, Performance and Emission of a Direct Injection Diesel Engine

Abstract

The main objective of this study was assessment of the performance, emissions and combustion characteristics of a diesel engine using RME–1-butanol blends. In assessing the combustion process, great importance was placed on evaluating the stability of this process. Not only were the typical COVIMEP indicators assessed, but also the non-burnability of the characteristic combustion stages: ignition delay, time of 50% heat release and the end of combustion. The evaluation of the combustion process based on the analysis of heat release. The tests carried out on a 1-cylinder diesel engine operating at a constant load. Research and evaluation of the combustion process of a mixture of RME and 1-butanol carried out for the entire range of shares of both fuels up to 90% of 1-butanol energetic fraction. The participation of butanol in combustion process with RME increased the in-cylinder peak pressure and the heat release rate. With the increase in the share of butanol there was noted a decrease in specific energy consumption and an increase in engine efficiency. The share of butanol improved the combustion stability. There was also an increase in NOx emissions and decrease in CO and soot emissions. The engine can be power by blend up to 80% energy share of butanol.

Co-Combustion of Hydrogen with Diesel and Biodiesel (RME) in a Dual-Fuel Compression-Ignition Engine

“…A more pronounced reduction in CO2 was observed for RME, which has a lower carbon content compared to diesel fuel. The relative accuracy of CO2 concentration measurement was within ±5% of the measured values [29,30]. Soot.…”

“…The effect of hydrogen was more pronounced in the co-combustion with biodiesel. The relative accuracy of CO concentration measurements was within ±5% of the measured values [29,30].…”

“…Beyond this concentration, HC emissions decreased due to improved homogeneity of the air-fuel mixture, which can be attributed to a significant increase in the amount of hydrogen supplied to the engine during the intake stroke. The relative accuracy of HC concentration measurements was within ±5% of the measured values [29,30].…”

“…Higher HRRs indicate elevated maximum cylinder temperatures, promoting NO formation. The NO concentration measurements were relatively accurate within a range of ±4% of the measured values [29,30].…”

“…An important factor enabling a greater reduction in soot concentration for hydrogen-RME was the additional oxygen supplied in the biofuel, which facilitated carbon oxidation. The relative accuracy of soot concentration measurement was ±0.05 mg + 3% of the measured value [29,30].…”