Experimental Investigation of the Effect of Using Biodiesel and Biogas on Dual Fuel Diesel Engine

In this study، the diesel engine fuel system was modified and the use of alternative fuels، i. e. biodiesel and biogas، was investigated in biological dual-fuel diesel engines. Biodiesel fuel from waste cooking oil was produced by transesterification method and biogas fuel was produced through anaerobic fermentation of livestock waste. Biogas comprised primarily methane (70%) and carbon dioxide (30%). In the present study، 90% of the diesel was replaced by biogas، while the remaining 10% was used as a pilot fuel. Using equipment such as mixer، regulator، filter، valve and flow meter، the basic diesel engine (Lister M8/1) was converted into dual-fuel diesel engine. Afterwards، the engine performance and emission tests at full load and at fixed speed of 750 rpm were investigated for fossil fuels (diesel and natural gas) and biofuel (biodiesel and biogas). The experimental results indicated that the simultaneous use of biofuels (biodiesel and biogas) in dual-fuel engines is possible، though it is accomponied by the loss of engine power. In these conditions، the NOx emission decreased، unlike the enhanced emission of CO، CO2 and UHC.