Study of Diesel Combining with Vaporizing Ethanol via a Carburetor for a Diesel-engine Generator

Nowadays, diesel prices in Thailand are increasing steadily due to crude oil market volatility. To reduce the diesel consumption, the research aims to study the performance and emission characteristics of a diesel-engine generator fueled with vaporizing ethanol via a carburetor combining with diesel on a dual fuel mode. The vaporizing ethanol is changed by increasing main jet diameter from 0.8 to 1.0 mm combined with diesel injection on the dual fuel mode, as compared with only diesel mode at a constant speed of 3,000 rpm and different loads. Results shows that the addition of vaporizing ethanol by adding main jet diameter combining with diesel led to the reduction of engine performance. The exhaust emissions, especially nitric oxide and black smoke, were reduced with vaporizing ethanol increased, but there was the increase of carbon dioxide and carbon monoxide. The research found that the use of main jet diameter at 0.8 mm in vaporizing ethanol combining with diesel resulted the addition of diesel saving to 47%, and brake thermal efficiency was dropped only by 2%. Nitric oxide and black smoke emissions were decreased up to 12%, while carbon dioxide and carbon monoxide releases were only slightly increased.