Abstract
The present investigations were carried out on the common rail diesel injection (CRDI) engine in dual-fuel mode with exhaust gas recirculation. Biogas is one of the best alternatives for conventional fuel which has several benefits with limitations. In dual-fuel mode, biogas was injected from the inlet manifold at flow rates of 4 and 5 litres per minute (lpm) as a secondary fuel and diesel was used as the primary fuel. The biogas at 5 lpm consumption gave a 6.78% brake thermal efficiency higher than that of diesel fuel. Exhaust gas recirculation (EGR) was used in dual-fuel mode at a flow rate of 5 lpm of biogas. The use of NOX resulted in a drastic reduction of about 50% for the 5 lpm with 5% EGR when compared with other samples. However, it led to an increase in HC emissions due to lower heat release rate. In dual-fuel mode, the flow rate of 5 lpm produced the highest in-cylinder pressure of 71.1 bars at a crank angle of 366° and lowest in-cylinder pressure for 5 lpm with 5% EGR.
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