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Black Carbon and Other Gaseous Emissions from an Ocean-Going Vessel Main Engine Operating on Two Fuels

Abstract

The purpose of this research was to quantify the black carbon (BC) and other emissions from a marine main engine operating on marine gas oil (MGO) and a heavy fuel oil (HFO) on an ocean voyage from Oakland to San Pedro, CA. Emissions measurements included Total Hydrocarbons (THCs), Nitrogen Oxides (NOx), Carbon Dioxide (CO2), and PM, including PM2.5 mass (2.5 μm fine particles only), elemental, organic and BC. Several real time or semi-real time BC measurement techniques based on the principles of gravimetric net weight change, flame ionization detection (FID), photoacoustic (PA) measurements, and aerosol light scattering were employed. The measured bsBC emissions by the Micro Soot Sensor (MSS) 483 and the Photoacoustic Extinctiometer (PAX) were essentially the same for MGO fuel and for the HFO fuel. The correlation coefficients for these BC measurements versus EC measurements by the IMPROVE and NIOSH methods all exceed 0.96 indicating a significant correlation. The slopes of the correlations vary from 0.75 to 1.6 depending upon the sensor and the fuel. The bsNOx emissions for MGO fuel were slightly lower than those for the HFO fuel, averaging 21.9 for the MGO fuel and 24.6 for the HFO fuel for the 20 to 60% loads. Brake specific SO2 (bsSO2) emissions were lower for the MGO fuel compared to the HFO fuel at the same load, consistent with the lower sulfur content of the MGO fuel. Emissions on a brake specific basis were generally lower at the lowest load point, which was 5% for this study.