INVESTIGATIONS ON THE PERFORMANCE AND EXHAUST EMISSIONS OF A DIESEL: CARBON MONOXIDE(2)

CARBON MONOXIDE(2)

The figure .5 shows the emission of Hydrocarbon (HC) from the engine for MI oil without and with preheating with respect to brake power. It is seen from the figure that the hydrocarbon increase with increase in load it may be observed that the MI oil without preheating shows higher values of hydrocarbon emission from 98ppm at no load to 175 ppm at full load and that of diesel shows 71 ppm at no load and 120 ppm at full load. It is very interesting to not that the preheated oil shows 32 ppm at no load and 90 ppm at full load.

The reduction of HC emission is 58% at 75% of full load and 48% at full load compared to without preheating and for that of diesel was 52% reduction at no load and 25% for full load. The preheating of oil shows the effective combustion of MI oil due to better injection leads to better vaporization, mixing and improved combustion in the combustion chamber result in lower fuel consumption and reduced HC emission.
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Figure: 5 HC emissions for MI Oil with and without preheating
It is seen from the figure that the HC increases with increase to brake power. The measured hydrocarbon level was 71ppm at no-load to 120 at full load for diesel, 98ppm at no load to 175 ppm at full load for MI oil, 110 ppm at no load to 321 ppm at full load for advanced injection timing and 110 ppm at no load to 320 ppm at full load for retarded injection timing. Again the higher hydro carbon emission was due to improve combustion and advance/retard by 3 deg CA did not favour much to reduce HC emission.