Fleet Deployment and Voyage Planning Optimization for Liquefied Natural Gas Shipping Under Power of Mixed Boil Off Gas
Liquefied natural gas ships can use the natural and forced boil off gas from their laden cargo as the propulsion power during navigation.This paper proposes an optimization method of fleet deployment and voyage planning for liquefied natural gas shipping powered by mixed boil off gas.A correlation function between liquefied natural gas ship speed,consumption volumes of boil off gas,and volumes of voyage delivery is constructed to balance the relationship between forced boil off gas of liquefied natural gas and voyage costs.Considering factors of owning and chartering ships,voyage transportation time,and boil off losses,this paper develops a management strategy of mixed boil off gas,and a joint optimization model for fleet deployment,voyage planning and speed of liquefied natural gas shipping is formulated with the goal of minimizing the annual operating cost of liquefied natural gas shipping companies.A nested solution algorithm based on model decomposition is proposed by combining genetic algorithm with optimization software.Using the actual operational data of liquefied natural gas shipping companies as a case study,this paper verified that the management strategy of mixed boil off gas can effectively reduce the operating cost by 7.13%and ship idle rate by 4.8%.The sensitivity analysis results indicate that as the spot price of liquefied natural gas increases,the management strategy of mixed boil off gas to adjust volumes of forced boil off gas has a more significant effect on reducing operating costs for shipping companies.
waterway transportationfleet deployment and voyage planningjoint optimizationliquefied natural gasmanagement of boil off gas
NETL
NSTL
万方数据
维普
