The Effect of Different Mixing Proportions and Different Operating Conditions of Biodiesel Blended Fuel on Emissions and Performance of Compression Ignition Engines

Abstract

Faced with the depletion of fossil fuels and increasingly serious environmental pollution, finding an environmentally friendly renewable alternative fuel has become one of the current research focuses. In order to find new alternative fuels, reduce dependence on fossil fuels, improve air quality, and promote sustainable development goals, castor biodiesel was produced through transesterification, and mixed with diesel in a certain proportion. The engine performance and emissions were compared and analyzed under fixed load and different speeds of agricultural diesel engines. Biofuel, as a fuel containing oxygen, promotes complete combustion to a certain extent. As the proportion of castor biodiesel in the mixed fuel increases, the emissions of pollutants such as CO, HC, and smoke show a decreasing trend. The lowest CO, HC, and smoke emissions were observed in the B80 blend at 1800 rpm, at 0.3%, 23 ppm, and 3%, respectively. On the contrary, the CO2 and NOx emissions of the B80 blend are higher than those of 2.7 diesel, reaching 2.5% and 332 ppm respectively at 1800 rpm. The lower calorific value and higher viscosity of biodiesel result in a decrease in BTE and an increase in the BSFC of the blends. Higher combustion temperatures at high speeds promote oxidation reactions, resulting in reduced HC, CO, and smoke emissions, but increased CO2 and NOx emissions. At high speeds, fuel consumption increases, BSFC increases, and BTE decreases. Overall, castor biodiesel has similar physical and chemical properties to diesel and can be mixed with diesel in a certain proportion for use in CI engines, making it an excellent alternative fuel.

Biodiesel Production through the Transesterification of Non-Edible Plant Oils Using Glycerol Separation Technique with AC High Voltage

“…Furthermore, Tables 4 and 5 show the fuel properties of jatropha and pongamia biodiesel and their blends, respectively. By inspection of Tables 4 and 5, it can be seen that the kinematic viscosity and density of jatropha and pongamia biodiesels are higher than those of diesel fuel; however, this fact was reported by Zheng and Cho [52], who stated that these characteristics have an effect on the fuel's flow and atomization. In addition, the calorific value of jatropha and pongamia biodiesels is generally lower than that of diesel fuel; however, this fact was reported by Zheng and Cho [52], who stated that the calorific value makes the fuel consumption of biodiesel blends higher than that of diesel fuel.…”

“…By inspection of Tables 4 and 5, it can be seen that the kinematic viscosity and density of jatropha and pongamia biodiesels are higher than those of diesel fuel; however, this fact was reported by Zheng and Cho [52], who stated that these characteristics have an effect on the fuel's flow and atomization. In addition, the calorific value of jatropha and pongamia biodiesels is generally lower than that of diesel fuel; however, this fact was reported by Zheng and Cho [52], who stated that the calorific value makes the fuel consumption of biodiesel blends higher than that of diesel fuel. The flash point values of jatropha and pongamia biodiesels are higher than those of diesel fuel; however, biodiesel has a major benefit in terms of storage and transportation due to its high flash point [52].…”

“…In addition, the calorific value of jatropha and pongamia biodiesels is generally lower than that of diesel fuel; however, this fact was reported by Zheng and Cho [52], who stated that the calorific value makes the fuel consumption of biodiesel blends higher than that of diesel fuel. The flash point values of jatropha and pongamia biodiesels are higher than those of diesel fuel; however, biodiesel has a major benefit in terms of storage and transportation due to its high flash point [52]. The cloud point values of jatropha and pongamia biodiesels are higher than those of diesel fuel, as shown in Tables 4 and 5; however, in the study of Sarin et al [53], the jatropha and pongamia biodiesels had cloud points of 4.0 and −1.0 • C, respectively.…”

Advancements in In-Cylinder and After-Treatment Strategies for Mitigating Pollutants from Diesel Engines: A Critical Review

“…B100 or neat biodiesel is not always quite favorable primarily due to its high viscosity owing to the excess fatty acid content resulting in poorer fuel atomization . Also, biodiesel does not perform well in colder weather conditions as the viscosity of the fuel increases, further resulting in clogged filters and gelling up of fuel, thereby concluding that an optimum % proportion of biodiesel within the biodiesel-diesel blend improves performance . Every synthesized biodiesel contains fatty acid esters, and the combination of these saturated and unsaturated fatty acids is characteristic to a given raw material from which they have originated.…”

Moisture Content Assessment of Commercially Available Diesel Fuel Using Impedance Spectroscopy

“…The precision of both the design and operation of the injectors is at the price of their sensitivity to contaminants [5]. Significant progress in reducing diesel consumption by diesel engines would not be possible without a simultaneous increase in fuel quality [4][5][6][7]. Among the parameters describing diesel quality that must be met in full by commercially available fuel is the permissible water content [8].…”