Abstract
In order to explore the influence of EGR at different altitudes on the performance of biofuel diesel engines, a comparative experimental study is conducted with the biodiesel–ethanol–diesel B15E5 (biodiesel with 15% volume fraction, ethanol with 5% volume fraction and diesel with 80% volume fraction) mixed fuel at different EGR rate and different atmospheric pressure. The experimental results show that diesel engine power performance and economy goes up with the increase of atmospheric pressure, and it decreases with the increase of EGR rate. At 2200 rpm, the improvement range of medium and high diesel engine load is 1.5–6.8%, and that of 1800 rpm is 2.8–11.7%. At the same atmospheric pressure, with the increase of EGR rate, the power and economy turn worse. The peak combustion pressure and heat release rate both increased with the increase of the atmospheric pressure at full load. At the same atmospheric pressure, peak combustion pressure and peak heat release rate fall with the increase of EGR rate. At part load, firstly, smoke emissions fall with the increase of the load and then rise. As the atmospheric pressure goes up, the smoke emissions show a downward trend, with a decline of 6.6–40%, while the NOx emissions show a rising trend, with an increase of 1.2–8.5%. At the same atmospheric pressure, the smoke emission increase with the increase of EGR rate by 9–12.5%, and the NOx emissions increase with the decrease of EGR rate by 2.5–6.8%. The HC and CO Emissions decrease with the increase of atmospheric pressure. HC emission decreases by 9.3–19.1%, and CO emission decreases by 2.9–16.6%. At the same atmospheric pressure, the HC emission decreases with the increase of the EGR rate by 3.3–4.5% at medium and high loads, and the CO emission increases with the EGR rate by 3.1–4.5%.
Highlights
With the rapid development of economy, the consumption of oil has increased dramatically, and the environmental problems are worsening day by day
Researches show that biodiesel and ethanol fuel, which are oxygenated fuel, on the one hand, can improve the combustion process of engine, and improve engine performance and reduce the emission of particulate matter (PM), carbon monoxide (CO), and hydrocarbon compounds (HC), especially in the plateau area [6,7]; on the other hand, the increase of oxygen content will lead to the increase of nitrogen oxide (NOx) emissions [8,9]
This paper studied the effects of different exhaust gas recirculation (EGR) rates on the power performance, economy, combustion and emission characteristics of a high pressure common-rail diesel engine fueled with biodiesel–ethanol–diesel (BED) mixture at different altitudes, and analyzed the relationship between the working characteristics of the high pressure common-rail diesel engine fueled with biofuel fuel under different atmospheric pressures and its influence, which provides a theoretical basis for the application of BED
Summary
With the rapid development of economy, the consumption of oil has increased dramatically, and the environmental problems are worsening day by day. Tan et al [20] studied the influences of performance of burning biomass fuel B25E5 (biodiesel with 25% volume fraction, ethanol with 5% volume fraction, and diesel with 70% volume fraction) and exhaust gas recirculation (EGR) system under plateau environment Their experimental results showed that while burning pure diesel, the power performance with the increase of EGR rate lowered under the working conditions of external characteristic. This paper studied the effects of different EGR rates on the power performance, economy, combustion and emission characteristics of a high pressure common-rail diesel engine fueled with biodiesel–ethanol–diesel (BED) mixture at different altitudes, and analyzed the relationship between the working characteristics of the high pressure common-rail diesel engine fueled with biofuel fuel under different atmospheric pressures and its influence, which provides a theoretical basis for the application of BED biofuel fuel in plateau area
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