Chemical Plant Relocation and Route Reassignment Models

Based on facility location and route assignment model, several multi-objective optimization models for chemical plant relocation are established. There are four main objectives: minimum risk, maximum utilization of the original transportation network, minimum cost, and minimum distance for relocation. Two kinds of mathematical model are presented: the arc-model using the flows on arcs as decision variables and the route- model using the route flows as decision variables. The multi-objective models are transformed into single objective models in which risk is minimized while constraints are imposed on the utilization, cost and distance. Arc-model is easy to be solved and the solution of route-model can clearly show the routes of transporting chemical products. The numerical results are promising.