2005 年 40 巻 6 号 p. 761-766
The increase in world population and the concomitant growth in world economy especially in Asia has created a necessity for additional energy which should not come at the cost of CO2 emission. The situation can be solved by making use of fuel produced from biomass. Dimethyl ether (DME) is a promising fuel in view of its clean emission and relatively low technical problems to commercialize it for light duty and heavy duty trucks. The emission of the latest 20 ton truck is within the post 2005 challenge regulation (namely, 09 regulation, NOx: 0.23g/kWh, PM: 0.01g/kwh) . The low boiling temperature of DME (-24.8C) necessitates the use of blend fuel for the safety of marine engines. The viscosity of the blend fuel (30% DME and 70% palm oil) is close to that of diesel fuel giving a similar performance as that of diesel fuel. The higher DME content in the blend fuel decreases the soot from the engine. The carbon deposit in the combustion chamber should be burned by the use of neat or high content of DME blended fuel.