Co-combustion of biodiesel with oxygenated fuels in direct injection diesel engine

Abstract

Abstract. The paper presents results of experimental investigation of cocombustion process of biodiesel (B100) blended with oxygenated fuels with 20% in volume. As the alternative fuels ware used hydrated ethanol, methanol, 1-butanol and 2-propanol. It was investigated the influence of used blends on operating parameters of the test engine and exhaust emission (NOx, CO, THC, CO2). It is observed that used blends are characterized by different impact on engine output power and its efficiency. Using biodiesel/alcohol blend it is possible to improve engine efficiency with small drop in indicated mean effective pressure (IMEP). Due to combustion characteristic of biodiesel/alcohol obtained a slightly larger specific NOx emission. It was also observed some differences in combustion phases due to various values of latent heat of evaporation of used alcohols and various oxygen contents. Test results confirmed that the combustion process occurring in the diesel engine powered by blend takes place in a shorter time than in the typical diesel engine.

Combustion of different reactivity fuel mixture in a dual fuel engine

“…Ethanol is considered a potential substitute to diesel fuel. It is renewable fuel, has a high latent heat of vaporization, it is an oxygenated fuel, sulfur-free and has the high burning rate, with high potential to reduce NO x and particulate matter (PM) emissions from Diesel engines [8][9][10]. One of the major limitations of using diesel fuel-ethanol blends in compression ignition engines is the low miscibility of ethanol in diesel fuel for a large temperature range, due to differences in the chemical structure of these components, which may cause phase separation [4,5,7].…”

“…Also, the blends are not stable and separate in the presence of trace amounts of water. In such a power system can not change the ratio of diesel /alcohol [4][5][6][7][8][9][10]. The co-combustion of fuels blends is interesting as well.…”

“…The co-combustion of fuels blends is interesting as well. In papers [4][5][6][7][8][9][10] are presented results of the investigation of co-combustion of alcohol fuels with diesel or biodiesel fuels. It was stated that the combustion process in the dual fuel engine fueled with diesel and alcohol fuels has different pattern compared to combustion in the conventional compression ignition engine.…”

“…From the literature review, it is clear that most of the research work on ethanol has been done on blend with diesel [4][5][6][7][8][9] and [16][17][18]. Although many publications on dual fuel engines can be found in the literature, it seems that the topic has not been exhausted.…”

Modeling of Thermal Cycle CI Engine with Multi-Stage Fuel Injection

“…The amount of nitrogen oxide formed depends primarily on the amount of free oxygen and the increase in temperature and rate of heat release in the first kinetic stage of the combustion process [20,21]. Figure 9 shows the NO emissions for the three analyzed injection strategies.…”