Research On Ship Main Propulsion System Operational Energy Consumption Analysis And Forecast

In recent years, with the increasingly prominent issue of global warming, maritime industry CO2 control has become the focus of the industry attention.The Energy Efficiency Operational Index (EEOI) and the Ship Energy Efficiency Management Plan (SEEMP), developed by the International Maritime Organization (IMO), has been seen as goals for ship operators to conservate energy. For most vessels under operation, propulsion energy consumption makes up a large proportion of total energy consumption. There is still considerable energy saving potential to improve resistance performance and propulsion efficiency.Quantitative analysis and forecast of ship propulsion energy in a voyage can provide useful reference for operators to develop the SEEMP and optimization plan, therefore, research on the analysis and forecast of ship main propulsion system energy consumption has important significance and practical value.In this paper, a method of single voyage propulsion energy consumption quantitative analysis and forecast based on modelling and simulation is suggested. The major factors of the main propulsion system energy consumption are considered, and a main propulsion system operational energy consumption analysis model for a 176000 dwt bulk carrier’s single voyage is established. The model is verified and used for simulation. Speed and route factors that affect the voyage main propulsion system energy consumption are discussed.First, in accordance with process of modular model construction, five modules (or subsystems) including wind and wave force, hull hydrodynamic force, rudder force, propeller thrust and main propulsion system energy consumption are established. For each module, mechanism analysis is done before mathematical relationship between input and output is established. The main propulsion system energy consumption model for target ship is finally established with fully taking into account the features of hull, main propulsion system and rudder subsystems.Secondly, simulations of target ship speed trial and turning circles trial are done. The ship motion module is validated through contrasting the simulation results and the trial report; the whole ship main propulsion system operation energy consumption model is validated by contrasting the voyage simulation results and the data records in the engine log book. The contrast indicates that the model meets the research needs in accuracy.Finally, three simulations were made:distribution forecast of main engine propulsion energy consumption; impact of ME speed on main engine propulsion energy consumption; impact of route selection on main engine propulsion energy consumption.The results demonstrate that the model satisfies the need for quantitative analysis and forecast of ship main propulsion system voyage energy consumption; this method can assit ship operators to forecast main propulsion system energy consumption in next voyage; the calculating results provide references for ship operators to develop the SEEMP or energy efficiency optimization plan.