Improvement of performance and emission characteristic of waste plastic pyrolytic oil blended diesel fuel in variable compression diesel engine using graphene nano additive

A growing interest in extracting oil from waste plastics has converged with rising demand for petro-fuels and issues in disposing of waste plastics. The characteristics of pyrolytic oil produced from plastic wastes were compared to diesel and found to be sufficiently similar to be used as an alternative fuel. In this paper, an attempt has been taken to enhance the combustion properties of waste plastic oil blended diesel following dispersion of nanographene particles. The performance and emissions of a single-cylinder direct injection compression ignition engine with compression ratios ranging from 16:1 to 18:1 was evaluated using 50, 70, and 100 ppm by using 50, 70, and 100 ppm by mass of nanographene dispersed in 20% waste plastic oil blended diesel without any engine modification. By supercharging the engine with nanographene at various compression ratios, the performance of a 20% plastic oil blended diesel is compared to that of a neat diesel. The brake thermal efficiency of 20% plastic oil blended 100 ppm graphene dispersed diesel fuel increased by 1.16% at a compression ratio of 17:1 when compared to diesel. The CO, HC, NOx emissions also dropped significantly by adding 100 ppm nanographene to WPO as compared to the other combinations of fuels.

Performance and Emissions Characteristics of a Direct Injection C.I Engine Fuelled with Waste Plastic Oil and Diesel Concoction

The oils extracted from the waste plastic can be an admirable alternate for the compression ignition engines nevertheless they capitulate upper smoke emissions along with deprived performance when compared with diesel. The extraction of waste plastic oil (WPO) is attained through pyrolysis. The impact of accumulating a constituent hexanol (H), a biologically available biofuel is assessed. Three ternary mixtures, DE50-WPO40-H10, DE50-WPO30-H20 and DE50-WPO20-H30 has been deliberately primed for utilizing mutually a cast-off element (WPO maximum of 40 percent) along with a non-conventional part (hexanol maximum of 30 percent). The performance characteristics and emission factors of C.I engine fuelled with the above mix were assessed. The output specifies that hexanol inclusion makes significant reduction in smoke emission in addition to privileged HC emission in contrast to diesel. Inclusion of 10 percent hexanol in volume with WPO and diesel mixture retards the NOx emission considerably whilst match up to WPO as well as diesel individually. In spite of this, NOx emission is superior than the subsequent WPO with increased degree of hexanol converges. Brake thermal efficiency of the engine increases by way of escalating the hexanol portion in the blend while comparing with WPO. The fuel spending of concoction has been established to be reduced while compared to WPO. DE50-WPO40-H10 concoction showed a reduced amount of NOx as well as smoke emission.

Effect of EGR on Performances and Emissions of DI Diesel Engine Fueled with Waste Plastic Oil: CDF Approach

Recently, there is an increasing interest in the pyrolysis of waste plastic into usable fuel as a friendly environment method for waste plastic disposal. The existing literature from various studies stated that the major problem related to the use of WPO in diesel engines is the high NOx emissions level. This paper aims to remedy this problem by suggesting the best EGR percentage with the advanced optimum injection timing. Primary, 5 EGR percentage fractions are considered: 0%, 5%, 15%, 20% and 25% percent. The results showed that 25% is the best percentage regarding emissions. However, a significant reduction in mean in-cylinder pressure, temperature, and heat release rate was depicted with the EGR fraction increase. Injection timing is advanced to recoup the decrease in performance. The results showed that 25% of EGR and advanced injection timing by 5 degrees would be better for performances and emissions of DI diesel engine while running with waste plastic oil as an alternative fuel.

Characterization and Impact of Waste Plastic Oil in a Variable Compression Ratio Diesel Engine

The characterization of pyrolysis oil obtained from mixed waste plastics and its utilization in a compression ignition engine were investigated. The chemical compositions and physicochemical properties of distilled waste plastic oil (WPO) and crude waste plastic oil (CWPO) were analyzed. The experiment was conducted with a variable compression ratio diesel engine at various loads and compression ratios to evaluate combustion characteristics, exhaust emissions, and engine performance. The experimental results show that CWPO contains the highest percentage of carbon atoms in the C4–C11 group, while WPO contains the highest percentage of carbon atoms in the C12–C20 group, similar to the main compositions of diesel fuel. According to the preliminary study in chemical compositions and physicochemical properties, WPO and diesel fuel were selected for the engine test at different compression ratios of 16, 17, and 18 and different engine operating loads of 25%, 50%, and 75% of maximum engine torque at an engine speed of 1500 rpm. It was found that increasing the engine operating load and the compression ratio tends to increase the brake thermal efficiency. Increasing the compression ratio results in a significantly shorter delay time in a combustion state. A lower cetane index and a higher percentage of long chain carbon compounds (C12–C20) could be the main factors affecting higher NOx, CO, and HC emissions with the combustion characteristics of WPO, compared to diesel fuel. The disadvantage of emissions by the use of WPO can be alleviated when the engine is running at maximum load and a high compression ratio.