Most of these methods suffer power loss either due to reduction of volumetric efficiency or due to additional power required for pumping of alcohol
or due to late participation of alcohol in combustion.
In order to avert these problems the authors located a needle in the heat exchanger very near to the intake mainfold and methanol was inducted continuously
and all these works were carried out without changing any parameters of the engine.
This paper presents the experimental investigations carried on a diesel engine using methahol as an supplimentary fuel and ethylene glycol dimethyl ether as a fuel additive.
Due to poor self ignition temperature and high latent heat of evaporation of methanol the ignition improver is added to the methanol.
A waste heat recovery heat exchanger is provided to pre-heat the inlet air by exhaust gases.
The inlet air temperature slightly increases with the help of heat exchanger.
Methanol in the heat exchager between 20-50% og total flow rate.
which preheats the inlet air by utilizing the waste heat from the exhaust gases.
The inlet air temperature increases about 80 องศา.
The heat exchanger was provided with arrangements for fumigating methanol and measuring the inlet air temperature by thermometer.
The engine was loaded by a hydraulic dynamometer and fuel consumption was carried out by burette set up.
Exhaust gas temperature (EGT) was measured by tachometer.
Smoke emission measurements were carried out by smoke meter.
Smoke density measured in terms of Hartridge Smoke Unit (HSU).
Oxides of Nitrogen (NOx) measurements were carried out by exhaust gas analyser in ppm.
Particulate matter (PM) measurements were carried out by a high volume sampler which is connected to the tail pipe of the engine.
The engine tests were conducted upto maximum load range at constant speed of 1500 rpm and the performance parameters such as fuel consumption,
EGT,PM,Smoke density,NOx, Sound level were measured for the following different attempts
1.Normal engine setup (Fuel used - diesel).
2.Engine equipped with heat exchanger (fuel used - diesel).
3.Engine with heat exchanger and methanol was fumigated in different proportions followed by,
-20% Methanol + Diesel
-30% Methanol + Diesel
-40% Methanol + Diesel
-50% Methanol + Diesel
4.Engine with heat exchanger and ethylene glycol dimethyl ether (EGDE) used as an additive with Disel in different proportions
-Diesel with 0.25% of EGDE
-Diesel with 0.50% of EGDE
-Diesel with 1.00% of EGDE
From the above observations it was found that 40% methanol fumigation and then diesel with 0.5% of ethylene glycol dimethyl
ether (EGDE) were selected for the final test.
The final test was carried out with the combinations of Heat exchanger with diesel + 40% ofmethanol +0.5% of EGDE.
RESULTS AND DISCUSSIONS
The engine parameters such as brake thermal efficiency (BTE), Smoke density,Oxides of nitrogen (NIx), particulate matter (PM),
and exhaust gas temperature (EGT) are presented aginst brake power(BP) for all the attempts.