Exhaust Gas Simulation of Hydrogen–Ethanol Dual Fuel
Exhaust Gas Simulation of Hydrogen–Ethanol Dual Fuel
Authors
Authors
Date
2015-01-16
Datos de publicación:
Electronic Journal of Energy & Environment, Vol. 1, Nº 2, 67-73, 2013
Keywords
Combustión - Etanol - Fracción molar - Reacción de disociación
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Abstract
The drawback of lean burn with ethanol
is reduced power output. Lean operation of ethanol
fuelled engines has additional drawbacks. Lean mixtures
are hard to ignite, despite the mixture being
above the low fire (point) limit of the fuel. This results
in misfire, which increases unburned hydrocarbon
emissions, reduces performance and wastes fuel. Hydrogen
can be used in conjunction with ethanol provided
it is stored separately. Mixing hydrogen with a
oxygenated hydrocarbon fuel such as ethanol reduces
all of these drawbacks. The low ignition energy limit
of hydrogen combined with a high burning speed
makes the hydrogen-ethanol mixture easier to ignite,
reducing misfire and thereby improving emissions,
performance and fuel economy. The current study involved
generating simulation software that provides
the mole fraction of each of the exhaust species when
hydrogen is combusted with ethanol. The proportion
of hydrogen in the hydrogen–ethanol blend affecting
the mole fraction of the exhaust species is also simulated.
The program code developed gave reasonably good results for the present hydrogen-ethanol dual
fuel. At low and high percentages of hydrogen, and
during transition between ethanol and hydrogen, the
model predictions are not very clear. The best results
were obtained for a combination of 80% hydrogen
and 20% ethanol by volume.