Experimental Investigation into the Impact of Natural Gas-Diesel Mixture on Exhaust Emissions and Engine Performance in a Heavy-Duty Diesel Engine with Six Cylinders

Abstract

In this study, experiments were conducted with a mixture of pure diesel and natural gas. In the experiments, a 6-cylinder heavy-duty diesel engine with an engine displacement of 11,670 cc was used and the engine speed was kept constant at 660 rpm The 386 Nm torque value was accepted as 100% and experiments were performed at torque ratios of 25,50,75 and 100%. In the experiments conducted with natural gas -diesel dual fuel, natural gas was injected into the intake manifold with 1.5 bar pressure and 1.29 g/sec mass flow. The present study aimed to investigate the diesel-natural gas dual fuel combustion characteristics in heavy-duty diesel engines with high emission values, such as maritime transportation. In addition, the feasibility of natural gas as a secondary fuel in existing heavy-duty diesel engines without making significant structural changes was investigated. The findings obtained in mis study showed that the BTE value of a mixture of natural gas-diesel fuel decreased by 157, 89, 53, 53 and 28% at 25, 50, 75, and 100 torque values, respectively, compared to pure diesel. At maximum load, CO and UHC emissions were 4.42 and 4.5 g/kWh for pure diesel and 19.9 and 11.9 g/kWh for a mixture of natural gas, respectively.