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A comprehensive study on the effect of emulsification, solid nano additive and LPG dual fuel operation on engine behaviour of a WCO based compression ignition engine

ABSTRACT
The influence of emulsification, solid nano additive and LPG dual fuel operation on engine's performance, emission and combustion behaviour of a waste cooking oil (WCO) of sunflower oil based compression ignition engine was studied experimentally. Initially test engine was operated in single fuel mode with neat diesel (ND) and neat waste cooking oil (NWCO) as fuels at various loading conditions. In the second phase WCO was converted in to its emulsion (WCO-EM) and tested in the engine. The WCO emulsion was further modified into solid nano additive emulsion (WCO-NF-EM) and tested. Finally the engine was modified to operate in dual fuel mode and tested with LPG as the inducted fuel with WCO-NF-EM as pilot fuel. NWCO resulted in inferior engine operation with higher smoke, HC and CO emissions as compared to ND all power outputs. Significant improvement in BTE was noted with all the methods attempted. Dual fuel operation with WCO-NF-EM - LPG showed highest BTE which is very close to diesel value. Smoke and NOx emissions were considerably reduced with all the methods. Dual fuel mode with LPG induction showed the lowest smoke emission which was still lower than diesel value. WCOEM and WCO-NF-EM further reduced the HC and CO emissions at all power outputs. It is concluded that the WCO can be effectively used in diesel engines by converting into its solid nano additive emulsion in the unmodified engine. Combining dual fuel operation with WCO-NF-EM- LPG could achieve the engine operation similar to diesel.
KEYWORDS
PAPER SUBMITTED: 2017-01-11
PAPER REVISED: 2017-04-10
PAPER ACCEPTED: 2017-04-20
PUBLISHED ONLINE: 2017-05-06
DOI REFERENCE: https://doi.org/10.2298/TSCI170111120N
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