Abstract

The study examine the gaseous, smoke and particulate matter emission characteristics of a turbocharged heavy-duty diesel engine operated on conventional marine gas oil and gas-to-liquid Fischer–Tropsch fuel under modes of propulsion and generator operation. The gas-to-liquid showed average reductions up to 19% in nitrogen oxides, 25% in carbon monoxide, 4% in carbon dioxide and 30% in smoke with slight increase in unburned hydrocarbon emissions. Particulate number concentrations for gas-to-liquid were up to 21% higher, whereas particulates mass showed a 16% decrease at medium and high loads, while increasing by 12–15% under lower load conditions. Very low aromatic content of gas-to-liquid fuel and nearly zero sulfur level are responsible for particulate reduction.

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