Combustion Characteristics of Dual Fuel Diesel Engines with Biodiesel as an Ignition Fuel (1st Report, Investigation for CNG Used a Main Fuel)

Abstract

In order to use biodiesel as an ignition fuel on dual fuel diesel engines, the combustion characteristics and exhaust emissions of the dual fuel with rapeseed oil methyl ester and CNG (RCNG) are investigated by comparing to the dual fuel with gas oil and CNG (GCNG). The results show that the operable condition of RCNG is almost the same as that of GCNG. At 100% load the dual fuel diesel engine with RCNG can be operated when the equivalence ratio of the intake premixed CNG is about 0.1 to 0.53. The thermal efficiency of RCNG is almost the same as that of GCNG. RCNG has lower Smoke emissions compared with GCNG although NOx emissions of RCNG is slightly higher than that of GCNG. It is concluded that biodiesel can be used as an ignition fuel on dual fuel diesel engines.