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Water network optimisation in chemical complexes: a refinery case study

2022; Elsevier BV; Linguagem: Inglês

10.1016/b978-0-323-95879-0.50137-5

2543-1331

Francisco J.G. Patroćınio, Hugo M.D. Carabineiro, Henrique A. Matos, Nuno M.C. Oliveira,

Chemistry and Chemical Engineering

A two-level MINLP model is used for water network optimisation of large sites, composed of several independent plants. At the lowest level, the water consumption within a given plant is first minimised, considering feasible connections between the units of this plant, using a predefined set of interplant connections and capacities. During the second step, the water needs and wastewater emissions of each plant are coordinated, to minimise the network costs for the entire complex. This strategy was applied to the water network of the Petrogal Sines refinery, with significant reductions in the network operating cost and freshwater consumption, using a mixture of local and global numerical solvers available in the GAMS system.