Nitrogen Oxides Emissions from a Diesel Engine Fuelled with Water-Diesel Microemulsions

摘要

In this study, an experiment was conducted to examine the AVL research diesel engine using two kinds of water-diesel (W-D) fuel microemulsions. These W-D mixtures contained 3.5 and 7.0% by volume (%, v/v) of distilledwater dispersed in regular diesel fuel meeting the requirements of the EN590 standard. The engine was testedunder the conditions of low, moderate and higher loads. This research was focused on the emission characteristicsof nitrogen dioxide (NO 2 ) and nitrogen monoxide (NO). Cumulative emission of NO x was also analyzed beforebeing further discussed. The obtained results of this study showed that the addition of distilled water to the regulardiesel fuel has a minor effect on the variation of the nitrogen oxides emission. It was confirmed that NO is the maincomponent of NO x detected in the exhaust stream of the AVL engine fuelled with all tested fuels. It proves that thethermal mechanism of the nitrogen oxides formation was dominant in the combustion process. Moreover, it wasfound that the addition of water dispersed as microemulsion in diesel fuel had a minor effect on the reduction ofthe NO x emission.