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Single-cylinder engine study of methanol fuel-emphasis on organic emissions

Conference ·
OSTI ID:5349132
;
Exhaust emission and performance characteristics of a single-cylinder engine fueled with methanol are compared to those obtained either with gasoline or a methanol-water blend. The measurements of engine efficiency and power, and CO and NO/sub x/ emissions agree with trends established in the literature. Consequently, the emphasis is placed on organic emissions (unburned fuel including hydrocarbons, and aldehydes), an area in which there is no consensus in the literature. In all cases with methanol fueling, the unburned fuel (UBF) emissions were virtually all methanol as opposed to hydrocarbon compounds. Without special measures to overcome methanol's large heat of vaporization, UBF emissions were four times greater with methanol than those with gasoline. Similarly, aldehyde emissions were an order of magnitude greater with methanol. These high levels of organic emissions with methanol were related to inadequate fuel-air mixture preparation, which was caused by methanol's large heat of vaporization. Modifying the single-cylinder engine intake system to improve vaporization reduced UBF emissions 80 to 90 percent with methanol and 30 to 50 percent with gasoline. Aldehyde emissions were also significantly reduced by improving mixture preparation, but remained three to four times greater for methanol than for gasoline.
OSTI ID:
5349132
Report Number(s):
CONF-750264-3
Country of Publication:
United States
Language:
English

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Related Subjects

090200 -- Alcohol Fuels-- (-1989)
10 SYNTHETIC FUELS
33 ADVANCED PROPULSION SYSTEMS
330704 -- Emission Control-- Hydrocarbons
330800* -- Emission Control-- Alternative Fuels
ALCOHOLS
ALDEHYDES
AUTOMOTIVE FUELS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COMBUSTION PRODUCTS
COMPARATIVE EVALUATIONS
DISPERSIONS
ENTHALPY
FUELS
GASOLINE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
METHANOL
MIXTURES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
TESTING
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
USES
VAPORIZATION HEAT
WATER