Methyl and ethyl soybean esters as renewable fuels for diesel engines |
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Authors: | S J Clark L Wagner M D Schrock P G Piennaar |
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Affiliation: | (1) Agricultural Engineering Department, Kansas State University, 66506 Manhattan, KS |
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Abstract: | The primary problems associated with using straight soybean oil as a fuel in a compression ignition internal combustion engine
are caused by high fuel viscosity. Transesterification of soybean oil with an alcohol provides a significant reduction in
viscosity, thereby enhancing the physical properties of the renewable fuel to improve engine performance. The ethyl and methyl
esters of soybean oil with commercial diesel fuel additives revealed fuel properties that compared very well with diesel fuel,
with the exception of gum formation, which manifested itself in problems with the plugging of fuel filters. Engine performance
using soybean ester fuels differed little from engine performance with diesel fuel. A slight power loss combined with an increase
in fuel consumption were experienced with the esters, primarily because of the lower heating value of the esters than for
diesel fuel. Emissions for the 2 fuels were similar, with nitrous oxide emissions higher for the esters. Measurements of engine
wear and fuel-injection system tests showed no abnormal characteristics for any of the fuels after the 200-hr tests. Engine
deposits were comparable in amount, but slightly different in color and texture, with the methyl ester engine experiencing
greater carbon and varnish deposits on the pistons.
Presented at the American Oil Chemists’ Society meeting, Chicago, May 1983. |
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