Influence of the Fuel Injection Equipment on NOx Emissions and Particulates on a Large Heavy-Duty Two-Stroke Diesel Engine Operating on Water-in-Fuel Emulsion

Paper #:
  • 941783

Published:
  • 1994-09-01
Citation:
Henningsen, S., "Influence of the Fuel Injection Equipment on NOx Emissions and Particulates on a Large Heavy-Duty Two-Stroke Diesel Engine Operating on Water-in-Fuel Emulsion," SAE Technical Paper 941783, 1994, https://doi.org/10.4271/941783.
Author(s):
Pages:
19
Abstract:
Tests were carried out with the aim of studying the influence of the fuel-injection equipment (FIE) on gaseous and particulate-mass (PM) emissions when using water-in-fuel emulsion. The tests included different pump-nozzle combinations, a new slide-valve-type fuel injector, water-in-fuel emulsion and different fuel-sulphur contents. The NOx reduction is compared with the results of several other tests in large two-stroke engines using water emulsions.A NOx reduction of approximately 25% was obtained using a large pump-nozzle combination and 30% added water, without deterioration in the specific fuel oil consumption. The NOx behaviour is correlated to the injection intensity as well as to a water-amount effect.Fuel sulphur has a major influence on PM, as sulphates account for approximately 35% of the total PM when operating on ‘normal’ heavy fuel. A linear approximation estimates the ‘non-sulphur’ fuel PM at between 30 and 60 mg/Nm3, depending on the FIE system. No simple correlation was found to explain the PM behaviour in the test.
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