Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Fuel Consumption Estimation for Offshore Support Vessels
Submission Author:
Luiz Antonio Vaz Pinto , RJ , Brazil
Co-Authors:
Marlon Silva, Luiz Antonio Vaz Pinto, Ulisses Admar Barbosa Vicente Monteiro
Presenter: Marlon Silva
doi://10.26678/ABCM.COBEM2023.COB2023-0053
Abstract
The increasing rise in fuel prices coupled with new pollutant emission requirements justifies the importance of urgent measures to reduce consumption. Fortunately, the reduction of Green House Gases is almost always associated with reduced consumption. Such reductions can be seen as an increase in energy efficiency. To achieve these objectives, the use of frameworks capable of estimating engine consumption with a high degree of accuracy under different ship loading conditions is of great importance. In these cases, the total resistance of the ship is calculated, and the effects of waves, wind and current must also be considered. The main objective of this work is the estimation of fuel consumption in offshore support ships. However, the estimation of fuel consumption for an existing propulsion system is very complex, so the approach taken was to re-design the propulsion system. Firstly, the still water resistance was estimated using Holtrop's method (1982/84). Then, from the KT-KQ-J diagrams (1981), an algorithm was developed that suggests the most efficient propeller based on the hull shape. The next step was to estimate the added resistance due to winds and waves from any direction, based on the method developed by Liu and Papanikoloau (2020) and adopted by ITTC (2021). Subsequently, an algorithm based on the Burril Diagram (1963) was developed to perform a cavitation verification and select only those propellers that do not cavitate. Finally, the choice of the most efficient engine, which occurs from an algorithm developed applying concepts presented by Marques (2019) for fuel consumption estimation. The framework estimates the fuel consumption for the proposed engine based on simulations of different weather conditions. In the Oil & Gas industry one of the main concerns of maritime industry stakeholders is the reduction of fuel consumption in the propulsion system to reduce operational costs and the reduction of pollutant gas emissions. To achieve this goal, the two case studies performed were on vessels used in the Oil and Gas industry: PSV (Platform Supply Vessel) and a Tanker ship, comparing the actual fuel consumption of the vessel (1 year database) in relation to the weather condition faced by the vessel. The results obtained for the PSV were recorded by grouping the consumption of 5 periods of 5 days, the maximum deviation found was 9.5%. For the Tanker, 5 blocks of 18 days were grouped, obtaining a maximum deviation of 12%. Recommendations for improvement in methodology were identified.
Keywords
Fuel consuptiom, green house gases, offshore supply vessel
