Abstract
The International Maritime Organization (IMO) proposed to reduce the total CO2 emissions of the maritime sector by 50% by 2050, and strive to gradually achieve the zero-carbon target. Therefore, shipping companies need to consider environmental impacts while pursuing benefits. In view of the tramp ship scheduling with speed optimization problem, considering carbon emissions, the configuration of owner ships and charter ships, and the impact of sailing speed on ship scheduling with the target of minimizing the total costs of shipping companies, multi-type tramp ship scheduling and speed optimization considering carbon emissions is established. A genetic simulated annealing algorithm based on a variable neighborhood search is proposed to solve the problem. Firstly, the ship type is matched with the cargo. Then the route is generated according to the time constraint, and finally, the neighborhood search strategy is adopted to improve the solution quality. The effectiveness of the proposed model and algorithm is verified by an example, which also confirms that ship scheduling and sailing speed joint optimization can reduce costs and carbon emissions. Research results can not only deepen the study of the theory of tramp scheduling but also to effectively solve the tramp shipping schedule considering carbon emissions problems faced by companies to provide theoretical guidance.
Highlights
Seaborne transportation is one of the main freight transportation modes and the only cost-effective option for transportation of large volumes between the continents
Different from this paper, De focused on port time window and port sustainability, while this paper focused on tramp ship routing and scheduling with speed optimization considering carbon emissions including a fleet of heterogeneous ships that was composed of owner ships and charter ships
Aiming at the joint tramp ship routing and scheduling and speed optimization, this paper considers the impacts of carbon emissions, the configuration of owner ships and charter ships, and speed on ship routing and scheduling
Summary
Seaborne transportation is one of the main freight transportation modes and the only cost-effective option for transportation of large volumes between the continents. Within commercial shipping it is common to distinguish between three different basic operating modes: liner, tramp, and industrial. In contrast to liner shipping, tramp shipping does not consider service frequency. Tramp ships have more research gaps and complexities. With the rapid growth of world maritime trade volume, Maritime carbon dioxide emissions are projected to increase significantly in the coming decades. According to the International Maritime Organization (IMO), CO2 emissions from the maritime sector in 2007 increased by 86% compared to 1990 and accounted for 3.3% of the world’s total emissions. This study’s BAU scenarios project an increase of 50% to 250% in the period to 2050 [1,2]
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