The Optimization Of Fleet Deployment For Container Liner Shipping Under The SO_x Emission Limitation And CO₂ Reduction

While shipping industry has brought economic development,it has also aggravated environmental pollution.The emission of ships has gradually attracted attention from all walks of life.The emission of sulfur oxides has aggravated air pollution,and the emission of greenhouse gases has exacerbated global warming.The establishment of SOX Emission Control Areas(SECA)and the limitation of the sulphur content of marine fuel in the global area require ships to use low-sulfur fuel that meets the standard.The European Union has been committed to promoting the collection of maritime carbon emissions taxes,and the International Maritime Organization is planning to impose maritime carbon taxes and implement general emissions trading systems to control shipping carbon emissions.This has greatly increased operating costs for shipping companies.Fuel consumption and carbon dioxide emissions are positively correlated with the third power of ship speed.Therefore,environmental protection requirements bring greater pressure to increase costs for fast-moving container liners.Research on the optimization of container liner route allocation in the context of sulfur emission restrictions and carbon emission reduction has become an urgent problem to be solved.Based on the above situation,this article analyzes the mainstream sulfur emission reduction measures in the sulfur emission control zone and ships,combined with the carbon tax policy,converts carbon emissions into carbon emission environmental costs,and adds them to the objective function.From the perspective of a container liner company,we selected 3 different ship types operated by Company A and a fleet of 22 ships,and invested them in China-Northwestern Europe,China-North America West and Northwestern Europe –North America East 3 through sulfur Container liner routes in the emission control areas.Taking into account the sulfur emission control zone and maritime carbon tax restrictions,ship distribution,the ship’s SECA internal and external speed,the choice of using compliant low-sulfur fuel or installing a scrubber are taken as decision variables,and the total cost of the container liner company is set as the objective function.The genetic algorithm is used to solve the problem and the final ship allocation plan is obtained,and the sulfur reduction measures and the speed inside and outside SECA are given for each ship.The results show that: sailing at a lower speed in SECA can reduce fleet operating costs.Ships with large carrying capacity,long remaining life,and a large proportion of the voyage in the SECA,are more economical to install a scrubber.The increase in the carbon tax rate will gradually increase the speed of ships in the SECA and reduce carbon emissions,which will help reduce their own carbon emission costs and alleviate the greenhouse effect.The research results prove the validity of the model and can provide decision-making assistance for container liner companies.