Improvement of used vegetable oil quality for diesel engines

Name: Sittisak Krongdach

Organization : King Mongkut's University of Technology Thonburi. The Joint Graduate School of Energy and Environment

Name: Rattanachai Pairintr

Organization : King Mongkut's University of Technology Thonburi. School of Energy and Materials

Name: Kanit Krisnangkura

Organization : King Mongkut's University of Technology Thonburi. School of Bioresources and Technology

keyword: Vegetable oils

; Diesel fuels

Abstract: Thai’s economic depended on petroleum directly. But in this day, petroleum is expensive so renewable energy sources is needed. Used vegetable oil from waste cooking oil is cheap, low sulphur content and able to mix with diesel oil. However, used vegetable oil has high viscosity that caused the problem of fuel injection and spaying for combustion. Used vegetable oil can be improved it’s quality by “Transmethylation” which transforms triglyceride to fatty acid methyl ester which viscosity, density and molecular weight are decreased. However, methyl ester has boiling point and viscosity higher than diesel oil. In order to decrease the methyl ester boiling point and viscosity, it was blended with diesel oil. In this experimental result showed that the proprieties of methyl ester according to the ASTM standard had viscosity and density, and molecular weight were decrease when compare to used vegetable oil. Single droplet model was used as fuels which were sprayed from injector in the engine. The combustion rate and combustion ratio blended oil were examined by single droplet method and prediction from convective mass transfer theory. As a result, the deviations between experimental data and predicted were about 0.14 to 1.81% and 1.52 to 1.8 l%, respectively. Power output, torque and thermal efficiency were decreased with increasing concentration of methyl ester. The emission gas such as CO, NO, and smoke were increased when engine speed and methyl ester in the blended oil increased. Because methyl ester has high boiling point which cause combustion state is stronger than usual. And it also caused the exhaust temperature and NO, increases. Methyl ester can be used as sustentation for diesel oil. But methyl ester was m&e expensive than diesel oil. So, in the future should be study in other chemical reaction which able to produced complete methyl ester in shorter time and reduced the cost of methyl ester.

King Mongkut's University of Technology Thonburi. KMUTT Library

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Created: 2000

Modified: 2017-07-14

Issued: 2016-07-26

บทความ/Article

application/pdf

BibliograpyCitation : The first Regional Conference on Energy Technology Towards a Clean Environment, The Empress Hotel, Chiang Mai, Thailand 1-2 December 2000 p.128-136

CallNumber: 12001569

eng

©copyrights King Mongkut's University of Technology Thonburi

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