Abstract
The article presents results of a laboratory study on exhaust gas emission level from a marine diesel engine. The object of the laboratory study was a four-stroke marine diesel engine type Al 25/30 Sulzer, operated at a constant speed. The examination on the engine was carried out according to regulations of the Annex VI to MARPOL 73/78 Convention. The laboratory study consisted of 3 observations: the engine assumed to be operating without malfunctions, delay of the fuel injection by 5° of crankshaft angle in the second engine cylinder, and the leakage of the fuel pump on the second engine cylinder. Additionally, parameters of fuel consumption and thermodynamic parameters of the marine engine were measured during the research. Simulated malfunctions caused changes in total weighed NOx, CO, and CO2 emissions for all considered engine loads. All simulated malfunctions caused a small change in measured thermodynamic parameters of the engine. The engine operation with the delayed fuel injection and the fuel leakage in the fuel pump in one cylinder caused a decrease of NOx and CO emission level. Fuel leakage in the fuel pump causes the CO2 emission to decrease only at low engine load. Calculations of the weighed specific fuel consumption present a 1-2% change in the engine efficiency.
Highlights
Diesel engines have found an application in a transport field as a source of propulsion for vessels
In order to determine the effect of simulated malfunctions of the injection pump on the exhaust gas composition, a series of calculations based on data obtained during measurements were made
In order to compare obtained total weighted emissions by the engine assumed to be operating without malfunctions and with simulated malfunctions, on Fig. 1 the percentage values of changes in these emissions are shown
Summary
Diesel engines have found an application in a transport field as a source of propulsion for vessels. The standard that regulates permissible emission levels of toxic NOx from marine diesel engines is the International Convention for the Prevention of Pollution from Ships – MARPOL 73/78 [1]. The common rail and direct fuel injection technology has dominated the diesel engines car market. Sarvi et al present [5] a study of an effect of combining common rail system with direct water injection system on a level of the marine engine’s emissions. Disturbances in a normal fuel combustion process in the combustion chamber of the marine engine may lead to a noticeable difference in engine parameters and exhaust emission levels. Raeie et al [8] present the research results of the influence of the fuel injection start position and injection pressure level on the composition of exhaust emissions. Interference in the cylinder fuel supply process leads to disturbances in the regular process of fuel combustion and affects the composition of the exhaust emissions
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