Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science

COMPARISON OF FUEL CONSUMPTION AND EMISSION OF SMALL TWO-STROKE ENGINE OF ELECTRIC GENERATOR FUELLED BY METHANOL, BIOGAS, AND MIXED METHANOL-BIOGAS


DOI: 10.5937/jaes0-35699 
This is an open access article distributed under the CC BY 4.0
Creative Commons License

Volume 20 article 1009 pages: 1034-1039

I Wayan Agus Rantia Dana
Master Student at Study Program of Master in Mechanical Engineering, Engineering Faculty, Udayana University, Denpasar, Bali, 80234, Indonesia

David Lie
Master Student at Study Program of Master in Mechanical Engineering, Engineering Faculty, Udayana University, Denpasar, Bali, 80234, Indonesia

I Wayan Bandem Adnyana
Study Program of Industrial Engineering, Engineering Faculty, Udayana University, Jimbaran, Bali,80361, Indonesia

Tjokorda Gde Tirta Nindhia*
Study Program of Mechanical Engineering, Engineering Faculty, Udayana University, Jimbaran, Bali,80361, Indonesia

Samir Kumar Khanal
Dept. of Molecular Biosciences and Bioengineering, the University of Hawaii at Manoa, Honolulu, Hawaii, 96822, USA

Tjokorda Sari Nindhia
Faculty of Veterinary Medicine, Udayana University, Denpasar, Bali, 80234, Indonesia

A two-stroke engine run with flexible fuel of biogas or methanol is not established yet. It is the objective of this work to provide 2 stroke engine for an electric generator that can be run by using flexible fuels namely: methanol, biogas, and mixed methanol-biogas. A small single cylinder 2 stroke engine of an electric generator was set to be able to be fuelled by using 3 different types of fuel namely biogas (50% vol. CH4, 15% vol. CO2, 0 ppm H2S), methanol (CH3OH) with 97% vol. purity and mixed biogas-methanol. The electric generator that is used is for providing 750-watt electricity. The compression pressure was around 10 Bar with cylinder volume around 63 cc. The engine was set with an easy switch system of fuel. Since methanol is used as one type of fuel that is used, then special lubricant should be prepared for this purpose. It is generally known that commercial synthetic lubricant that is usually used and mixed with gasoline for 2-stroke engines is found not well mixed with methanol. The castor oil is selected to be used as a lubricant to be mixed with methanol with a ratio of methanol to castor oil of 50:1. During using only biogas as a fuel, the castor oil was dripped around 3 drops/minute in the biogas-air mixer chamber. The emission, as well as fuel consumption, were investigated both in idle position and loaded at 200 watts. It is found that for only biogas fuel, the fuel consumption is 18.83 L/minute and increases to become 15, 17 L/minute at a load of 200 watts. By using only methanol as a fuel, the fuel consumption is found 0.009 L/minute and increases to become 0.011 during loading at 200 watts. If mixed fuel is applied the biogas consumption becomes 2.06L/minute in idle position and 4.43 L/minute at a load of 200 watts. The lowest CO emission in idle position was found with biogas as fuel at 0.18 % vol., followed by mixed fuel biogas+ methanol at 0.26% vol. and the highest is methanol fuel at 0.25%vol. for a load of 200 watts, the lowest CO emission is found the same at biogas fuel at 0.18% vol., followed by mixed biogas + methanol at 0.011 % volume, and the worst is found for methanol fuel with CO emission of 0.33 % vol.

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The authors wish to thank The Engineering Faculty, Udayana University for providing financial support for the publication of this paper.

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