(70c) Analysis of Infeasiblity in Process Scheduling
AIChE Spring Meeting and Global Congress on Process Safety
2016
2016 AIChE Spring Meeting and 12th Global Congress on Process Safety
Computing and Systems Technology Division
Decision-Making for Industrial Process Systems I
Tuesday, April 12, 2016 - 8:44am to 9:06am
In this work, we present use of infeasibility analysis for a multi-purpose chemical batch process scheduling especially in the context of rescheduling. We isolate multiple irreducible inconsistent sets (IISs) systematically to identify bottle-necks in process scheduling network. An IIS is a subset of an infeasible model, such that the IIS itself is infeasible but any proper subset of the IIS is feasible. Isolating an IIS in an infeasible model provides a set of mutual inconsistencies that must be eliminated to achieve feasibility. The methodology incorporates interactive scheduling interface which provides quick resolution to real-time disturbances. We demonstrate the power of this methodology in successfully analyzing infeasible scheduling models with the well-known Westernberger-Kallrath case study.