SIMULATION OF THE INFLUENCE OF SHIP VOYAGE PROFILES ON EXHAUST EMISSIONS

Simulation methodology is used to assess fuel related pollutants, CO(2) and SO(2), based on several reference ship voyages. Firstly, the definition of ton-mile specific emission factor is introduced. This emission factor is related to a wide range of factors extending from fuel parameters and engine operational condition to ship design and ship activity. In this case study, a simulation model is built that applies to both transient and stationary conditions. By running this model, ton-mile specific emission factors of CO(2) and SO(2), for both the full voyage and a single part of the voyage are achieved. The influences on exhaust emissions of ship speed fluctuation and in port operation strategy are considered, as well as the influence of loading fraction. After a series of simulations it is demonstrated that, a larger speed fluctuation and more intense variation of ship operational activities during maneuvering in port would cause higher emissions and the assumption of full load will underestimate the ton-mile specific emissions.