Abstract
In a combined system of the diesel and gas engine, the EGR method can easily be designed to reduce total NOx emission in the system, such as with LNG ships. The problem of the EGR system is the high PM concentration that causes some engine troubles. This can be reduced by mixing the exhaust gas from a gas engine into the intake air of a diesel engine. The EGR ratio was limited at 17% of the intake oxygen concentration, and without an increase of PM and CO. The system can be designed in full consideration of the displacement of both engines for practical use.
