Blending action of pyrolysis oil/diesel fuel featured with hydrogen on compression ignition engine performance and emission analysis

Waste high-density polyethylene (HDPE) is a non-biodegradable toxic, and harmful material. To maintain environmental sustainability, the waste HDPE involves alternative fuel extraction. The main objective of this study is to extract the alternative oil fuel from the source of the waste HDPE through pyrolysis with a reactor temperature of 300-550 degrees C and study the compression ignition (CI) engine performance and emission behavior. ASTM standards evaluate the physical and chemical properties of oil fuel, and its results showed that 40 and 43 degrees C flash and fire point temperatures, better Cetane number of 49, and a good calorific value of 43.17 MJ/kg. The CI engine performance and its emission behavior are experimentally studied with different blending ratios of HDPE oil: hydrogen: diesel fuel like 0:0:100 (D), 0:5:95 (5HD), and 10:5:85 (10B5HD). With this output, results of 10B5HD exhibited better engine performance like better brake power (BP-6.78 kW), optimum brake specific fuel consumption (BSFC-0.52 kg/kWh), improved brake thermal efficiency (BTE-28.78%) and reduced emission behavior including carbon monoxide (CO-0.43%) and carbon dioxide (CO2-24 ppm), hydrocarbon (HC-5.4%) and nitrogen oxide (NOx-760 ppm). Based on these results, 10B5HD performed better than diesel fuel and was utilized in future alternative fuel applications.