Effect Of Diethyl Ether And Ethanol Additives On The Combustion And Emission Characteristics Of Biodiesel-diesel Blended Fuel Engine

The biodiesel is close in the physics and chemistry characteristic with the diesel, non-toxic and can be degraded and also is one kind of green renewable energy. At present it has already served as alternate fuel for crude oil automobile's in many countries. However, because biodiesel contains 10% oxygen, it may cause the automobile NOx emissions increasing. To face more and stricter emissions laws and regulations, the people carry on many attempts and the research to reduce the biodiesel NOx emissions. This paper blended ethanol and diethyl ether into the biodiesel-diesel blends, acquired blends with different ration, calculated and analyzed the main properties of the blends, and carried on the experiment about fuel efficiency, combustion and emissions characteristic on the engine.The test fuels are denoted as B30 (30% biodiesel and 70% diesel in vol.),BE-1 (5% diethyl ether,25% biodiesel and 70% diesel in vol.) and BE-2 (5% ethanol,25% biodiesel and 70%diesel in vol.)respectively. The results indicate that, compared with B30, there is slightly lower brake specific fuel consumption (BSFC) for BE-1. Drastic reduction in smoke is observed with BE-1 and BE-2 at higher engine loads. Nitrogen oxide (NOx) emissions are found slightly higher for BE-2. Hydrocarbon (HC) emissions are slightly higher for BE-1 and BE-2, but carbon monoxide (CO) are slightly lower. The peak pressure, peak pressure rise rate and peak heat release rate of BE-1 are almost similar to those of B30, and higher than those of BE-2 at lower engine loads. At higher engine loads the peak pressure, peak pressure rise rate and peak heat release rate of BE-1 are the highest and those of B30 are the lowest. BE-1 reflects better engine performance and combustion characteristics than BE-2 and B30.