Estimation of exhaust emissions for a patrol ship of Malaysian Maritime Enforcement Agency

The growth of transportation and machineries in the maritime industry contribute serious impact on air quality on sea, land and nearby port. Ship is one of the potential contributors to exhaust emission and most of ship is equipped with main diesel engine. The level of engine operation can affect the level of emission concentration. For this study, improved methodology is applied to estimate the amount of carbon monoxide (CO), nitrogen oxide (NOx) and carbon dioxide (CO2) emission from ship at different speed. The result is compared to previous studies or standard limits. The onboard measurement and equation of combustion are used in this study. The shipboard test is conducted on a patrol ship, KM Kukup at 700rpm, 900rpm and 1100rpm. The parameter at exhaust platform and engine are measured using gas analyzer and Kestrel 4500 pocket weather tracker. Emissions are calculated as g/kWh and overall shows CO2 with 345.91±53.87 g/kWh have highest value followed by CO with 3.75±0.57 g/kWh. NOx emitted the lowest value of 1.82±0.32 g/kWh. At speed level, CO2 lowest (215.70 g/kWh) at 700rpm and highest at 1100rpm (429.52 g/kWh). At 900 rpm, CO is highest with 4.35±0.62 g/kWh and at 1100 rpm lowest with 2.88±0.34 g/kWh. NOx was lowest at 700rpm (1.02±0.15 g/kWh) and highest at 1100rpm (2.05±0.41 g/kWh). An overall comparison showed that all emission was within typical range of diesel engine except for NO. Some comparison with the previous study show large differences due to the dissimilarity in work method and technique applied to estimate emissions. Using this activity-based methodology, the amount of exhaust emission was found depending on the sailing mode. Also, through this method the energy used of the ship was able to calculate.