||Prevention of Air Pollution from Ships: Diesel Engine Particulate Emission Reduction via Lube-Oil-Consumption Control.
Miller, T. C.;
Jackson, M. A.;
Brown, A. J.;
Wong, V. W.;
||Coast Guard, Washington, DC. ;Department of the Navy, Washington, DC. ;Environmental Protection Agency, Washington, DC.
Diesel engine exhaust emissions;
Single cyclinder engines;
Particle air pollutants;
Intake manifold pressure;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||Strategies to alleviate particulate emissions from diesel engines on board vessels operating in coastal waters are being investigated. The approach is to determine the effectiveness of reducing engine lube-oil consumption as a means to reduce particulate pollutants. In this study, simultaneous lube-oil consumption and particulate emission data were collected on a single cylinder diesel engine for various speeds and loads using three piston-ring and intake-air pressure configurations. A sulfur dioxide-based measurement system was used to measure lube-oil consumption by tracking the sulfur from the lube-oil in the exhaust while using ultra-low sulfur diesel fuel. A scaled down version of a Constant Volume Sampling (CVS) system with a dilution tunnel was used to measure total particulate emission rate. Lube-oil contribution to particulate was determined using chromatography. The aggregate data show that an average of approximately 64% of the consumed lube-oil ends up as a significant portion of the total particulate. This percentage is lowest at the medium-load conditions at which moderately high exhaust temperatures and lean air-fuel ratios provide an environment suitable for the partial or complete oxidation of the consumed lube-oil. Significant reductions in particulate emission rate could be obtained by controlling engine lube-oil consumption. This can be effected by changes in piston-ring designs (tension and shape, for example) or by manipulating engine operating conditions, such as intake air-pressure, and possibly via other lubrication-system related variables. Replacement of piston rings with low-lube-oil-consumption designs, for example, could be an option with existing engines.
||Prepared in cooperation with Department of the Navy, Washington, DC. and Environmental Protection Agency, Washington, DC.
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||68A; 85A; 81J
||PC A03/MF A01