ABSTRACT
The main objective of this investigation is
to improve the performance and cleaning up
diesel engine’s exhaust by fumigating methanol
and by adding fuel additives of known
percentages. To control the emission from
diesel engine and to improve performance,
alternate fuel and incylinder control techniques
were used. The experimental study was
carriedout in a single cylinder diesel engine. A
waste heat recovery heat exchanger was
provided to preheat the inlet air by utilizing
exhaust gas heat. The experimental setup is
such that the methanol is fumigated in the heat
exchanger very near to the intake manifold.
The results of an experimental investigation
relating to the performance characteristics by
fumigating methanol and fuel additive are
reported. The result shows an appreciable
reduction of emissions such as particulate
matter, Oxides of nitrogen, Smoke density and
marginal increase in the performance when
compared with normal diesel engine.
INTRODUCTION
Worldwide dependence on petroleum
products and associated economic and
environmental problems have become quite
apparent over the last decade. since the world
transport is totally depend on petroleum fuels.
This situation has stimulated industry in
evaluating alternative to crude oil derived fuels fuels.
The diesel engine because of its fuel economy
playing a dominant role in I.C. engines. The
diesel engine is used more than any other type
of engine for transportation, thermal power
generation and many miscellaneous industrial
applications. It has been established as the most
efficient of all the engines, which convert energy
from hydrocarbon fuels into work. The exhaust
pollutants from combustion in diesel engine are no
different from those of other combustion
processes, the difference being only in the level of
concentration of individual pollutants. The major
pollutants from diesel engines are Smoke,
Particulate matter (PM), Oxides of Nitrogen
(NOx), Carbon monoxide (CO), Unbumt
hydrocarbons (UBHC ). The NOx and Smoke
appears in high levels in diesel engines. Hence
there is need to improve performance of diesel
engine together with reduction in tail pipe
emissions.
In order to improve efficiency and to reduce
the atmospheric pollutants emitted by I.C. engines
it is worthwhile to assess the suitability of clean
burning fuels. methanol and ethanol offer the most
promising substitutes for petroleum as engine fuels
at present (1). Compression ignition engine cannot
be run on straight methanol because of its poor
ignition quality. Use of methanol - diesel solutions
is also impracticable because methanol is almost
insoluble in diesel. Inspite of these difficulties,
there are many methods available to supplement
methanol into the diesel engine(3).
By means of carburetor similar to gasoline
engine.
Low pressure injector to inject methanol at
intake manifold continuously.
Low pressure injector very near to the intake
valve and methanol was inducted during valve
opening period.