Dynamic hybrid simulation of batch processes driven by a scheduling module

Simulation is now a CAPE tool widely used by practicing engineers for process design and control. In particular, it allows various offline analyses to improve system performance such as productivity, energy efficiency, waste reduction, etc. In this framework, we have developed the dynamic hybrid simulation environment PrODHyS whose particularity is to provide general and reusable object-oriented components dedicated to the modeling of devices and operations found in chemical processes. Unlike continuous processes, the dynamic simulation of batch processes requires the execution of control recipes to achieve a set of production orders. For these reasons, PrODHyS is coupled to a scheduling module (ProSched) based on a MILP mathematical model in order to initialize various operational parameters and to ensure a proper completion of the simulation. This paper focuses on the procedure used to generate the simulation model corresponding to the realization of a scenario described through a particular scheduling.

► Dynamic hybrid simulation environment based on Object Oriented concept.
► Use of the Unit Specific Event formulation for the MILP scheduling module.
► Use of the Object Differential Petri Nets for the dynamic simulation module.
► Scheduling and simulation coupled by task tokens and a hierarchical recipe Petri net.
► Ensure a proper completion of the simulation with respect of time constraints.