Thermal and Chemical Exhaust Gas Recirculation Potential of Punnai Oil Biodiesel Fuelled Diesel Engine For Environmental Sustainability

Abstract

Pollution from diesel engines affects negatively the environment. As a result, there is a worldwide concern about reducing the pollutants emitted by diesel engines. In comparison to diesel fuel, biodiesel combustion produces reduced carbon monoxide (CO2) and unburned hydrocarbon (UHC) emissions, but higher nitrogen oxides (NOx) emissions. The current study is to investigate the thermal and chemical effect of exhaust gas recirculation (EGR) on features of a diesel engine for environmental sustainability. The punnai oil was produced from kernels of punnai seeds and transesterified in two phases using alcohol with the existence of a catalyst. The higher viscosity of punnai oil biodiesel is diluted by mixing it with diesel fuel. Our previous investigation indicated that neat punnai oil biodiesel is a potential fuel; however, the findings showed that the addition of diesel is necessary to obtain acceptable engine performance. In this study, punnai oil biodiesel was mixed at a rate of 20% with diesel (B20) and run in a diesel engine with varied EGR rates under five different engine loads. This combined impact enhanced the maximum heat release rate (HRR) and maximum combustion pressure, according to the findings. The premixed burning fractions were commonly higher at all engine loads, whereas the diffusion combustion fractions were lower. When the centre of the HRR changed toward the top dead centre (TDC), combustion durations remained rather constant. The experimental results revealed B20 blend at 10% EGR flow rate produced 6.57% lower BTE, 37.04% higher BSEC, 2.47% higher EGT, 5.13% lower CO, 31.11% higher CO2, 3.13% higher UHC, 8.36% lower NOx and 4% higher smoke opacity when compared with diesel in a standard diesel engine.

Experimental investigation of methyl ester derived from distillate of coconut oil as eco‐friendly fuel in diesel engine

“…In this experiment, we have taken a blend of B20, B30, and B100 for the combustion process. Blend B20 has 20% of coconut oil distillate biodiesel and 80% of diesel, blend B30 has 30% of Coconut Oil Distillate biodiesel and 70% of diesel, and blend B100 has 100% of Coconut Oil Distillate biodiesel (Bibin et al., 2022). Because of its properties such as viscosity, density, and oxygen content, this oil is chosen for the research work.…”