바이오디젤의 열적특성과 인화점에 관한 연구

Abstract

This study examined the thermal characteristics and flash points of biodiesel and the results are as follows. 1) The measurement by the use of Cleveland open cup flash tester revealed that BD-100%, BD-70%, BD-50%, BD-30%, BD-20%, BD-10%, BD-5% and petroleum diesel have flash points of 182℃, 107℃, 86℃, 72℃, 70℃, 66℃, 62℃ and 58℃ respectively, which confirms that flash point increases with more percentage of biodiesel contained. 2) The measurement by the use of Tag closed cup flash tester showed that BD-50%, BD-30%, BD-20%, BD-10%, BD-5% and petroleum diesel have flash points of 83℃, 70℃, 68℃, 64℃, 60℃ and 54℃ respectively, so we can draw the same conclusion as Cleveland open cup tester showed that the flash point rises with more biodiesel contained, though the figures are relatively small compared to the flash points of Cleveland open cup tester. 3) The observation of the pressure changes by the use of MCPVT indicates that the maximum pressure tends to go up as more biodiesel, which has relatively bigger molecule size than vehicle diesel, is added and that pure biodiesel has a pressure of more than 10bar compared to pure vehicle diesel. 4) The observation of the temperature changes by the use of MCPVT points out that except for pure vehicle diesel they all had almost the same level of maximum temperatures and that they also showed the same temperature changes with the changes of time.