Abstract
There are many studies on multi-fuel diesel engine, and the most prominent among these are natural gas dual fuel diesel engines. The purpose of this study is to investigate the effect of common rail pressure and natural gas mass fraction on the emission of natural gas dual fuel diesel engines. Experiments were performed with differential common rail pressures and natural gas mass fractions at three loads, and engine revolutions were fixed at 2,000 RPM. As a result, the specific emission of NOx increased and CO and THC decreased as the common rail pressure increased; however, CO₂ did not change. There was no effect of the natural gas mass ratio on the trend of specific emission of NOx and CO. In the case of THC, it increased as the natural gas mass ratio increased at the lower output. In the case of CO₂, the reduction rate was about 45%, and it decreased by about 4% per 12 kW output as the natural gas mass ratio increased.
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