EFFECT OF VARIOUS PARAMETERS ON PERFORMANCE AND EMISSION OF DIESEL-LPG DUAL FUEL ENGINE

Mechanical Engineering

The conventional petroleum fuels for internal combustion engines are depleting rapidly, due to increase in the vehicular population. Moreover, these fuels cause serious environmental problems by emitting harmful gases into the atmosphere. Generally, pollutants released by engines are CO, NOx, Unburnt hydrocarbons, smoke and limited amount of particulate matter. At present, alternative fuels like methyl esters of vegetable oil (commonly known as biodiesels), alcohols etc. which are in the form of liquid and hydrogen, acetylene, CNG, LPG etc. in gaseous fuels are in the line to replace the petroleum fuels for IC engines. Based on the literature available dual fuel engine gives better performance compared to conventional engines. Literature also shows that LPG is most suitable gaseous fuel for dual fuel internal combustion engine. In dual fuel engine flow rate of LPG decreases. It causes dripping of diesel while injecting into the cylinder. To avoid dripping injection pressure needs to be increased. Injection pressure of 140 bar was found optimum from 120, 130, 140, 150, 160 bar. At 140 bar performance and emission test were conducted for LPG flow rates of 2, 3, 4 and 5 LPM. The results shows that the LPG flow rate of 4 LPM in dual engine gives better performance compared to diesel engine. It also shows that the emission also reduces with 4 LPM flow rate of LPG in dual fuel engine compared to diesel engine and other LPG flow rates in dual fuel engine.

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