Abstract
As there are more cars on the road, poisonous exhaust emissions from them are also more prevalent, which is dangerous for both human health and the environment. Another cause for concern is that the world's oil supplies are rapidly depleting, which is driving up fuel prices. Researchers from all around the world are looking for substitute fuels as a result of our species' excessive dependence on fuel sources that are becoming more costly and produce hazardous effects. The best substitute currently available is biofuels. It has been observed that the higher cost of biofuels compared to fossil fuels prevents their widespread utilization in diesel engines. Several research studies have been conducted to ascertain the use of vegetable oils as well as their derivatives as a substitute for diesel because of the rising need for biofuels. It may be possible to develop a more affordable and environmentally friendly energy source with broader applications by improving the biofuels' manufacturing methods and quality. Hence, this research study was carried out to enhance the quality of parsley biodiesel and determine whether it would perform well in engine applications as a sustainable biofuel. Parsley seeds were subjected to a solvent extraction process to extract their oil. Under a set of predetermined reaction conditions, the extracted oil was transformed using the transesterification method. To ascertain the sustainability of parsley biodiesel as a potential fuel for diesel engines, the research work was carried out in two phases: Analyzing the effect of the produced fuel on the response of a diesel engine. The second phase was performed to improve the quality of the produced fuel by the addition of synthesized green nanoparticles and the assessment of its effects on the behavior of the diesel engine.
Several proportions of parsley biodiesel (B5 to B20) with diesel fuel were created, it was discovered that the attributes of the blended fuel samples were within the required specification for use as an engine fuel. However, the fuel characteristics of the B20 blend were similar to diesel fuel. Also, when compared to other blends, it was found that the B20 biodiesel blend did indeed have the best
fuel ratio and quality. It was also observed that B20 Parsley blends produce fewer pollutants than other blends (B5 and B10). For the performance test, all biodiesel blends exhibited a reduction in brake-specific energy consumption and an improvement in brake thermal efficiency. The performance findings also showed that the BTE and BSFC of B20 are somewhat close to those of pure diesel fuel (B0). An optimization study was then conducted to understand the impact of the interaction between parsley biodiesel blend (PSB) fraction (B5 to B20), engine speed (100 to 3000 rpm), and load (40 to 100%) on diesel engine characteristics. The results showed that the investigated parameters had a significant influence on the engine performance and exhaust emission characteristics. The evaluated engine's best settings for improved performance and lower emissions when using the desirability-based method were a blend of 20.22 percent, an engine speed of 1483.39 rpm, and an engine load of 95.68%.
Furthermore, different nanoparticles (copper oxide NP, titanium dioxide NPs, and silicon dioxide NPs) were created using green materials and added to the B20 biodiesel mix to enhance the performance and emission characteristics. A 20% parsley biodiesel blend was added to the produced NPs at dose levels of 50 and 100 ppm and some 50, 75, and 100 ppm, respectively. Fuel-containing nanoparticles were stirred for 60 minutes at 450 rpm in atmospheric conditions using an ultrasonicator to produce uniform dispersion. The performance and exhaust emissions of the B20 blends with and without nanoparticles were examined. To obtain the best conditions for better engine efficiency, the process parameter was optimized using a B20 blend with CuO and SiO2 NPs to create the ideal circumstances for increased engine efficiency. How changing the nanoparticle concentration affects the responses was explained using the RSM Design-Expert 11.1.0.1 program (central composite design type). The process parameters (such as blend containing nano-additive, engine load, and speed) were set up as independent variables, and the responses BSFC, BTE, BSEC, CO, CO2, HC, and NOx were chosen. The obtained result revealed that the B20 blend with
50 ppm of the nanoparticle concentration (B20TNP50, and BSNP50) gave the best performance and emission characteristics even when compared to pure diesel fuel. This was also discovered for the B20 blend containing copper oxide nanoparticles (BC50).
The examination of exhaust pollutants from the diesel engine running on parsley biodiesel-diesel mixes with various nanoparticles was also assessed. According to the findings, B20 blends with 50 ppm of synthesized nanoparticles (BC50, B20TNP, and BSNP50) showed no negative effect on the studied engine. Hence, it can be utilized in vehicles' diesel engines without requiring major modifications to reduce hazardous emissions brought on by the usage of fossil diesel fuel. For higher fuel economy and engine efficiency, diesel fuel can potentially be replaced with a B20 blend containing a 50 ppm nano-additive.
Conclusively, it was observed that generated nano-fuel is a good choice for use in internal combustion engines due to its excellent performance characteristics, and decreased emissions.
Keywords: Parsley biodiesel; response surface methodology; nanoparticles; transesterification; fuel properties, engine performance; exhaust emissions.