Emission Reduction Goals for Railroad Diesel Locomotive based on the Measured Emission Characteristics Data
The air pollutant emission from the railroad diesel locomotive is still a significant environmental concern in many countries including Korea and Unites States. The emission characteristics of the railroad diesel locomotive were extensively studied in this study. Particulate matter (PM) and nitrogen oxides (NOx) emitted from a large locomotive engine (2-cycle, 16-cylinder, and 3,000-horsepower) under various engine-rating conditions was analyzed with a scanning mobility particle sizer and a gas stack sampler by using a dilution tunnel. The maximum concentrations of PM and NOx were measured to be 505.0 mg/m3 and 1,822 ppm, respectively. The hourly emissions of these pollutants were calculated to be 9.3 kg and 105.4 kg, respectively. By dividing these values by the output (3,000 horsepower in our study) of the engine, we could gain the emission values of 2.1 g/horsepower-hour for PM and 42.7 g/horsepower-hour for NOx. Based on these values, we proposed the emission reduction goal of the railroad diesel locomotive.