Study of Particulate Matter-, NO{sub}x- and Hydrocarbon Emissions From a Diesel Engine Fueled With Diesel Oil and Biodiesel With Fumigation of Hydrogen, Methane and Propane

摘要

To investigate possibilities for reduction of particulate matter emission from diesel engines, experiments with hydrogen, methane and propane mixed to the inlet air were performed in a Euro 2 Scania diesel engine. The base fuels were marine gas oil (MGO, a diesel oil quality) and biodiesel (80 vol% rape seed methyl ester and 20 vol% soy bean methyl ester). Up to 40% of the fuel energy was replaced by gas at three different load conditions. The emission of particulate matter (PM) was evaluated through particle mass measurements as well as filter smoke number (FSN) unit. The biodiesel resulted in higher PM emissions at low load, but considerably lower PM emissions at high load compared to MGO. The FSN was much lower for biodiesel than for MGO at all loads. Fumigation was not found to be exclusively advantageous with respect to PM emission. At low load, the PM emission was virtually unaffected by the introduction of hydrogen and propane while the PM emissions increased with methane fumigation. At higher loads noticeable reduction in PM emissions were observed at high gas rates.