Characteristics on GHG emission by the Repair Cycle and Notch of Diesel-powered Locomotive’s Engine in Korea

초록

Our study aimed to develop new emission factors of diesel-powered train, and this paper focuses on identifying whether the difference of repair cycle of engine affects amount of emission. To do this, we categorize 335 diesel-powered trains in terms of car type and repair cycle of engine, identify three train types by the repair cycle like 0 years, 3 years, 5 years, and measure each train's greenhouse gas emission.In this study, most of trains show similar trend in diesel consumption. These were gradually increased by notch changing from idle to 8. In fact, fuel was injected regularly into engine by pump. So it was concluded that diesel consumption wasn’t be affected by the repair cycle. CO2 and N2O concentration increased by notch increasing and there were little difference in the repair cycle of engine. However, CH4 concentration didn’t show tendency by notch changing and difference in the repair cycle of engine. In fact, CH4 concentration was too little to detect exactly. We analysed the degree of association between the repair cycle of engine and concentration of CO2 emission. As a result, the correlation is 0.002 and significance level is 0.994. It meant that CO2 emission wasn’t related to the repair cycle of engine. Furthermore, we calculate emission factors with these concentrations and emission factors were related to notch changing. But these weren’t proportional to notch increasing. In conclusion, the repair cycle is irrelevant to GHG emission, but notch is relevant to it. This result can contribute to the emission factor development of diesel locomotives by nullifying one controversial variable--repair cycle of engine--and simplifying observation methodology. On the other hand, we found that notch changing caused changing amount of GHG emission. This series of study are expected to effectively manage emission and drive efficient emission reduction technology development.