Abstract
In order to reduce the emissions of a dual fuel diesel engine fuelling biodiesel as an ignition fuel, the combustion characteristics and exhaust emissions of the dual fuel with coconut oil methyl ester and CNG (C_<CNG>) are investigated by comparing to the dual fuels with rapeseed oil methyl ester/CNG (R_<CNG>) and JIS no. 2 gas oil/CNG (G_<CNG>). The results show that the operable condition of C_<CNG> is almost the same as that of R_<CNG> and G_<CNG>. The dual fuel diesel engine with C_<CNG> can be operated when the equivalence ratio of the intake premixed CNG is about 0.1 to 0.49. The thermal efficiency of C_<CNG> is almost the same as that of R_<CNG> and G_<CNG>. C_<CNG> has lower smoke emissions compared with R_<CNG>. It is concluded that coconut oil biodiesel can be used as an ignition fuel on dual fuel diesel engines.
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