Ethanol/diesel study finds reduced emissions

A study using a four-cylinder diesel engine in China, by the Hong Kong Polytechnic and Tianjin University, has found using the fumigation of ethanol with diesel reduces nitrogen oxides, smoke and particulate matter. The use of the system does result in an increase in hydrocarbon and carbon monoxide emissions but these can be reduced by a diesel oxidation catalyst.

Ethanol fumigation is a dual fuel system where ethanol is introduced into the air intake by injection or vaporisation, with the diesel being introduced by injection directly into the cylinder as in a normal engine. The engine used was a 4.3L Isuzu engine without turbo or EGR.

The study found overall fuel efficiency was lower due to the lower calorific value of ethanol. There was an increase in fuel burned in the pre-mixed mode and the combustion duration was shortened when the ethanol/air mixture became richer at high engine loads. Nitrogen oxides are reduced due to the cooling effect of the ethanol. The system reduced smoke and particulate matter when compared to the normal engine using Euro 5 diesel.

Leave a Reply

Send this to a friend