Browse Publications Technical Papers 2009-01-1437
2009-04-20

Reducing Engine-Out Emissions for Medium High Speed Diesel Engines: Influence of Injection Parameters 2009-01-1437

In 2004 the European Parliament ratified the Euro III and IV standards limiting the pollutant emission of, among others, rail and marine diesel engines. In these sectors, it is particularly important to keep any fuel consumption penalty, when reducing emissions, to a strict minimum. Furthermore, exhaust gas after treatment is mostly avoided for cost reasons.
Thus, manufacturers are looking to pretreatment of fuels, alternative fuels, and limiting engine-out emissions as ways to attain the required emission levels. This paper discusses the experimental work done on a 1324 kW, 1000 rpm six cylinder marine diesel engine equipped with mechanical unit injectors. The aim was to determine the influence of compression ratio and fuel injection parameters on engine-out emissions, with emphasis on NOx emissions. A range of fuel injection parameters were examined, varying the start of injection, pump plunger diameter, injection pressure, and injector nozzle geometry. The tests were done at 1000 rpm and 25%, 50%, 75%, 90% and 100% rated power.
Results are shown in terms of emissions, brake specific fuel consumption, fuel injection pressure and in-cylinder pressure; and compared to the emission standards.

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