Production-Storage and Transport Integrated Planning for a Multi-site Mining Industry
Assuming that local planning usually leads to sub-optimal solutions, this work aims to solve an integrated production, storage and distribution problem as part of a global supply chain system. The problem we address combines a lot sizing and distribution
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Emines - Mohammed VI Polytechnic University, 43150 Benguerir, Morocco {asma.rakiz,pierre.fenies}@emines.um6p.ma 2 Paris II Panthon-Assas University, 75006 Paris, France
Abstract. Assuming that local planning usually leads to sub-optimal solutions, this work aims to solve an integrated production, storage and distribution problem as part of a global supply chain system. The problem we address combines a lot sizing and distribution problem in a multi-level, multi-product, multi-period production network. To solve it, we propose a MILP (Mix Integer Linear Program) taking into consideration the local constraints of the different subsystems, but also the global ones that express the interactions between subsystems. This model proposes simultaneously a production, storage and transport plan that satisfies a known demand while minimizing total production, storage and distribution costs. Finally, the solutions found within this approach have the advantage of considering the system’s overall decisional cohesion as well as the constraints propagation in the various links of the chain. The originality of the work comes from the fact that we have addressed a multi-level lotsizing problem, combined with a single rail transport problem. This integrated problem, to the best of our knowledge, has not been previously addressed. The model is tested and validated on a real mining industry, it proposes an integrated solution for simultaneous production, storage and distribution planning. Keywords: Intergated lot sizing Mining industry
Transportation Linear optimisation
1 Introduction This work takes place at OCP group, one of the world’s leading companies in the phosphate market. OCP has a complex supply chain structure that starts with the mining phosphate deposits and reaches customers all over the world. The present study concerns Youssoufia site, located in the central axis, one of the three independent parallel axes of OCP’s supply chain. This site produces three products (P1, P2, P3) delivered for two types of customers: local customers who refer to chemical transformation sites where acids and fertilizers are produced, and international ones from around the world. Youssoufia site is composed of three plants (laundry, calcining, and drying plant) that are interconnected by conveyors and separated by stocks upstream and downstream of each transformation process. This research focuses on supply chain planning problems as a whole. It considers an integrated planning approach where production, inventory, and transportation decisions are integrated. It adopts a global approach aiming to achieve an integrated flow planning that considers all the supply chain components including their © IFIP International Federation for Information Processing 2020 Published by Springer Nature Switzerland AG 2020 B. Lalic et al. (Eds.): APMS 2020, IFIP AICT 591, pp. 315–322, 2020. https://doi.org/10.1007/978-3-030-57993-7_36
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A. Rakiz and P. Fenies
respective constraints and specifications. The aim is to propose a single optimisation model
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