CO2 Mixed Fuel Combustion System for Reduction of NO and Soot Emission in Diesel Engine 970319

We propose a new concept on simultaneous reduction of NO and soot emissions in Diesel engine exhaust by the diesel fuel oil (n-Tridecane) with liquefied CO₂ dissolved. The CO₂ dissolved fuel is expected to undergo flash boiling or gas separation when being injected into the combustion chamber and improve spray atomization and mixing process both of which are primary factors to govern soot formation. Also the internal EGR effect caused by CO₂ injected with the fuel is expected to NO formation. In order to assess this concept, combustion experiments were carried out using a rapid compression and expansion machine. Thus, flame characteristics and heat release rate were analyzed for the combustion process of diesel fuel and CO₂ mixed fuel. And, it is revealed that the diesel fuel-liquefied CO₂ mixed fuel can successfully reduce NO emission in a diesel combustion system.