Diesel Engine Essay

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Diesel engines are used to power automobiles, locomotives, ships and irrigation pumps. It is also used widely to generate electric power. Diesel engines offer higher thermal efficiency and durability. Despite these advantages, the environmental pollution caused by diesel engines becomes a major concern throughout the world. Diesel engines produce smoke, particulate matter, oxides of nitrogen (NOX), oxides of carbon (CO & CO2) and unburnt Hydrocarbon (HC).
Several alternative fuels have been studied to either substitute diesel fuel partially or completely. Alternative fuels derived from biological sources provide a means for sustainable development, energy conservation, energy efficiency and environmental protection.
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It grows even on rocky, sandy, dry shallow soils and tolerates water logging conditions. Mahua oil was procured from an oil mill. The oil was filtered to remove the impurities. Diesel fuel was used as baseline fuel. The viscosity was determined at different temperatures using redwood viscometer to find the effect of temperature on the viscosity of mahua oil. The viscosity of mahua oil was found to be 9 times higher than that of diesel fuel. The flash point of mahua oil was higher than diesel and hence it is safer to store. It is seen that the boiling range of mahua oil was different from that of diesel.

These vegetable oils trasnsesterified before blend with diesel because of the oils have glycerol. It must extract from the bio fuel because it will affect the engine performance.

Among these, the transesterification is the most commonly used commercial process to produce clean and environmental friendly fuel. Methyl/ethyl/butyl esters of, mustard oil, mahua oil have been successfully tested on C.I. engines and their performance has been studied.

Fig 2.1 Mahua oil after transesterification

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