Abstract
The regulation of air pollutant from fossil fuel combustion process has been tightened up gradually. The increase of crude oil price is concerned with serious problems of national management. These both subjects should be cleared with any improvement of the marine engines. The regulation Annex VI for diesel exhaust gas has been discussed, and it has been enforced since May 2005. NOx, SOx, COx and PM (particulate matter) are well known as main components of air pollutants that emitted from diesel engines. The engines have high heat efficiency with CO2 emission rate, and SOx is possible to reduce by after treatment process in exhaust gas. Therefore, it is important to clear NOx and PM of marine engine. An emulsion fuel oil, mixed HFO and water with an additive, was applied to combustion tests by Optic Combustion Analyzer, 2/4 stroke diesel engines and test boiler. The emulsion fuel is not separated in any condition of heating up to 120°C with keeping emulsion state. The fuel property for combustion is maintained. It leads to decrease of NOx and PM with low cost.
