Reclaiming scheduling in dry bulk terminals considering blending during ship loading
The issue of reclaiming scheduling in dry bulk ter-minal yards was examined,with the objective of enhancing operational efficiency,minimizing delays,and optimizing the advantages of ship loading mixing operations.An optimization model was developed to schedule the reclaiming operations at a dry bulk terminal,considering the loading mixing process,in order to reduce delays.The integrated optimization of re-claiming scheme formulation,stacking position allocation,and reclaimer scheduling was conducted,by considering con-straints such as dynamic yard storage of various goods,mutual interference of reclaimer operations,and proportional synchro-nous reclaiming of multiple stacking positions.Based on the characteristics of the problem and model,a heuristic algorithm was designed to efficiently solve large-scale problems by using adaptive large neighborhood search.The experimental results show that,compared to a general solver,the method proposed in this paper can obtain high-quality material retrieval schedu-ling schemes for large-scale cases within 1 hour.Compared with the squeaking wheel algorithm,the average improvement of the objective function value in solving large-scale cases is 19.9%.Meanwhile,this method comprehensively considers the integrated optimization of stacking allocation and reclaimer scheduling for mixed loading.Compared with the results ob-tained without considering mixed loading,the total delay of reclaimer operations reduced by an average of 28.35%,which can provide theoretical support for dry bulk terminals to allo-cate yard resources and plan operations when considering mixed loading process.
dry bulk terminalstockyard reclaiming opera-tionblending during ship loadingscheduling optimizationa-daptive large neighborhood search
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