Improvement of Emission Performance in a Inline-pump Direct Injection Diesel Engine by Using Dimethyl Ether Fuel
18ICES/017
Authors
Youngdug Pyo - Korea Institute of Energy Research
Gangchul Kim - Korea Institute of Energy Research
Youngjae Lee - Korea Institute of Energy Research Jinhwan Bang - SK Corporation
Jeonkeun Oh - SK Corporation
Abstract
DME( Dimethyl ether ) fuel has numerous advantages as an alternative fuel. One is that because it has a high cetane number it can be used in a diesel engine, making it possible to obtain a high level of heat efficiency and reduce CO2 emissions. Another is that as an oxygenated fuel, it hardly emits smoke. On the other hand, however, it does have its problems such as high compressibility and low lubricity. Also NOx and CO emission is almost same that of diesel engine. To examine the emission performance improvements as well as problems of using neat DME fuel as an alternative fuel for diesel engines, this study was conducted for a performance test on the 3.3 liter conventional DI diesel engine. In this test, in order to increase the fuel injection rate of DME because of high compressibility and low heating value compared to that of diesel, the nozzle opening pressure of the injectors was lowered and the plunger stroke of the injection pump was extended. Generally EGR system is used to reduce NOx emission. So this study went on to test the application of EGR as a means to reduce NOx generation. Also in order to decrease the CO and THC in the exhaust gas the DOC converter was used. The test results show that the EGR and DOC converter are very effective method to reduce the NOx and CO emissions in case of Dimethyl Ether Fuel in diesel engine.