INVESTIGATIONS ON THE PERFORMANCE AND EXHAUST EMISSIONS OF A DIESEL: CARBON MONOXIDE(1)

The figure 4 shows the emission of carbon monoxide from the MI oil without and with preheating with respect to brake power. It is seen from the figure that the CO increase with increase in load Basically the emission of CO is high in case of MI oil from 0.35% volume at no loan 1.74% volume at full load and it clearly indicates that the combustion is poor in case of MI oil. However the preheated MI Oil showed 50% reduction in CO emission at loads than without preheating. The preheated MI oil gave 16% at no load and 1.26% at full load. The Reduction in CO emission is 54% at no land and 28% at full load for preheated oil. The values clearly indicate the improvement in combustion due to preheating. The heavier molecules of the oil due low energy density the quantity of oil injected is also more further the poor ignition qualities of oil ten to emit more amount of carbon monoxide. In the case preheating helped oil to participate better in combustion resulting lower CO emission than raw oil by 47% at 75% of full load. The CO emission was high for advance/retard injection timing at high loads only. At high loads the altered injection timing has direct impact on ignition delay. The delay period is important period at which the fuel preparation for combustion by self ignition. This clearly indicates that if the injection timing altered the emission is increased due to poor combustion of MI oil.


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Figure: 4 CO emission for MI Oil with and without preheating 4.4 HYDROCARBONS (HC)