Abstract
From the viewpoint of global environment protection, regulations for prevention of air pollution from ships have been discussed in the International Maritime Organization (IMO) and the regulations about NOx and SOx are expected to enter into force January 1st of 2000.And global warming is recently such a serious problem that it is necessary to reduce greenhouse gas emissions. CO2 and N2O in exhaust gas contribute to global warming.In addition to the above, IMO will revise the regulations every five years. Then emission will be expected to be applied to other air pollutants including N2O in the near future.Under these circumstances, we studied effect of fuel property or SCR system on harmful exhaust emissions such as N2O by using a 4-stroke diesel engine.The following are found:(1) N2O concentration from Marine Fuel Oil is approximately 10 times as high value as that from Marine Diesel Fuel.(2) N2O concentration from a diesel engine is influenced more strongly by sulphur content in fuel than by nitrogen content in fuel.(3) In using same fuel for a diesel engine, N2O concentration is influenced by NOx concentration. N2O concentration increases with an increase in NOx concentration.(4) In addition to NOx reduction, reduction of N2O and HC is possible by using this SCR system.
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