The emission characteristics of air pollutants from 4-stroke medium-speed marine diesel engines with emulsified fuel were investigated at both shop and on-board tests. Moreover, after long-time on-board engine operation with emulsified fuel, inspection of engine parts and analysis of deposits were conducted to evaluate the influence of emulsified fuel on engine parts. NOx decreased with an increase in water ratio of emulsified fuel. N2O increased with degradation of fuel quality, however, it decreased with an increase in water ratio. CO increased with an increase in water ratio at lower engine loads while it decreased at higher engine loads. HC and PM increased with an increase in water ratio at lower engine loads while it showed no considerable change at higher engine loads. Moreover, on-board test showed similar emission characteristics to those at shop test. In addition, parts inspection and deposit analysis found some defects on the parts with emulsified fuel. However, those are expected to be inconsiderable. The above results suggest that emulsified fuel have practicality enough to be applied to marine diesel engines.
Study of emission characteristics of air pollutants from 4-stroke marine diesel engine with emulsified fuel at both shop and on-board tests
1999
Conference paper
English
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