抄録
It is said that IMO MARPOL 73 / 78 Annex VI (Regulations for the prevention of air pollution from ships), adopted in 1997, will be put in force during 2004, and control of ship emissions will become a reality. Air pollution substances other than NOx and SOx that attract special attention include smoke density and particulate matter (PM) . Regulations for smoke emission control are already enforced in some port areas in Japan, Europe, and the U.S.
Because of these backgrounds, a smoke-reduction additive for diesel oil and light oil was developed in 2000.
A diesel engine equipment test was carried out using fuel oil containing this additive. Dust concentration, smoke density, concentrations of gaseous ingredients in the exhaust gas of a diesel engine, and fuel consumption rate were measured.
Test results showed that the fuel oil additive has the following effects:
1. Dust concentration and smoke density decreased with an increase in the addition rate. When the addition rate was 1/1000 v/v, dust concentration and smoke density were reduced by 25 to 35%.
2. The CO emission decreased and NOx emissions increased with an increase in the addition rate. This change was marked when the air supply was low.
3. Pmax increased and fuel consumption rate decreased with an increase in the addition rate.
