Effect of fuel aromatic content on PAH emission from a heavy-duty diesel engine

Polycyclic aromatic hydrocarbons (PAHs) emission tests for a heavy-duty die sel engine fueled with blend base diesel fuel by adding batch fractions of poly-aromatic and mono-aromatic hydrocarbons, Fluorene and Toluene, respect ively, were simulated to five steady-state modes by a DC-current dynamomete r with fully automatic control system. The main objective of this study is to investigate the effect of total aromatic content and poly-aromatic conte nt in diesel fuels on PAM emission from the HDD engine exhaust under these steady-state modes. The results of this study revealed that adding 3% and 5 % (fuel vol%) Fluorene in the diesel fuel increases the amount of total-PAM emission by 2.6 and 5.7 times, respectively and increases the amount of Fl uorene emission by 52.9 and 152 times, respectively, than no additives. How ever, there was no significant variation of PAH emission by adding 10% (vol %) of Toluene. To regulate the content of poly-aromatic content in diesel f uel, in contrast to the total aromatic content, will be more suitable for t he management of PAH emission. (C) 2000 Elsevier Science Ltd. All rights re served.