Effect of n-butanol fuel additive to methanol-gasoline blend on combustion and emission characteristics in a single cylinder spark ignition engine

Abstract

In order to reduce the effect of emissions on the environment by burning petroleum oil in engines, researchers have sought out one of the solutions to be the blending of oxygenated additives with the fossil fuels. In this study n-butanol was added to a blend of methanol-gasoline fuel. The effects on Combustion and emission are reported using a single cylinder Octane rating BASF internal combustion engine. The results obtained indicated that the combustion duration reduced with increased shared volume of n-butanol in the methanol-gasoline blends. The blends used were M10, (10% methanol 90% gasoline by volume), M10:20 (10% methanol, 20% n-butanol, 70% gasoline), M20:30, M80:10. The peak pressure increased with the methanol fraction in the blend with gasoline. Unburned hydrocarbon (UHC) emissions reduced with m80 to about 300 ppm and reduced even further with 10% n-butanol added to m80 showing that n-butanol has the effect of reducing UHC emissions when methanol fraction is above 20% in gasoline. As n-butanol was increased further by 30% in m20 (M20:30), Nox concentration did not change significantly when comparing values with the blends of m10 and M10:20

Optimization of spark-ignition engine characteristics fuelled with oxygenated bio-additive (triacetin) using response surface methodology

“…A similar effect has been observed in the majority of previous literature survey available on different oxygen-rich fuel additives used in sparkignition engines. 33,34 Moreover, the engine efficiency increases and attains maximum value until the engine load of 2000 watt, whereas it starts decreasing with a further rise in load. This can be attributed to the availability of rich mixture at higher load, which reduces the air-fuel ratio and results in lower BTE.…”

Comparing Unburned Fuel Emission from a Pre-chamber Engine Operating on Alcohol Fuels using FID and FTIR Analyzers

“…However, FID is not sensitive to unburned oxygenated fuel, aldehydes, and acetaldehydes, which are significant species in the exhaust for alcohol combustion. Several literature studies discuss the relative lower sensitivity of FID analyzer for unburned species with alcohol combustion both with blends of gasoline with methanol [7][8][9][10], ethanol [11][12][13][14], and nbutanol [15,16] as well as neat alcohol operation [17,18]. Accordingly, researchers typically employed alternative measurement methods, such as the Fourier Transform Infrared 01/28/2020 Spectroscopy (FTIR), gas chromatography (GC), and 2,4dinitrophenylhydrazine (DNPH) cartridge/impinger sampling systems to measure the unburned fuel species.…”