Science & tech · 2022
Does adding ethanol to a palm-oil-derived diesel fuel reduce emissions without sacrificing engine performance?
No: adding ethanol reduced carbon dioxide, nitric oxide and particulate matter, but carbon monoxide increased greatly. Engine performance also declined as ethanol vaporization increased, compared with normal operation using palm oil ethyl ester or regular diesel.
Details
This experimental engine test examined the performance and emissions of a diesel engine operating in dual-fuel mode. Palm oil ethyl ester (POEE) was the directly injected main fuel, while supplementary ethanol was introduced by carburetor fumigation.
The ethanol, described as low-activity, was supplied at rates up to 0.36 g/s. The engine ran at a constant speed of 3000 rpm with varying loads and without engine recalibration.
As ethanol vaporization increased in dual-fuel mode, engine performance declined continuously compared with normal-mode operation using either POEE or regular diesel. However, POEE fuel saving in dual-fuel mode increased by 40% compared with POEE in normal mode.
Combining POEE with ethanol fumigation produced continuing reductions in carbon dioxide, nitric oxide and particulate matter, while carbon monoxide increased greatly.
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