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Flexible modelling framework structure based on EON

The aim of the CHEM project was to develop and implement advanced Decision Support Systems (DSS) for process monitoring, data and event analysis, and operation support in industrial processes. The systems are synergistic integration of innovative software tools, which improve the safety, product quality and operation reliability as well as reduce the economic losses due to faulty states, mainly in refining, chemical and petrochemical processes.

The CHEM applications consist of integrated sets of software toolboxes that provide robust detection and diagnosis of process problems in real-time. The systems assist operators in assessing process status and responding to abnormal events. The project provides a flexible architecture and a methodology in order to facilitate the development of such applications on many processes.

Modelling is the first step needed for the solution of a production scheduling problem. As the problem has a high degree of complexity, the final result of this toolbox ('Flexible modelling framework structure based on EON') will be a modelling system capable to deal with the following aspects:
- Discontinuous (batch), continuous processes and a hybrid combination of both.

- Complex time relationships between operations.

- Complex transfer rules, and intermediate storage policies.

- Calendar and resource availability aspects.

The approach chosen is based on EON (event operation networks). The resultant module is provided with the following functionalities:
- Automatic generation of EON structures from information contained in ISA S88 like structure. The EON generated should include all the additional information related with the storage constraints and the resource constraints.

- Solving of the EON structure generated using fast EON solving algorithm.

- Writing of the solution in the ISA S88 like data structure.

- Interaction with the user using an EGC (Electronic Gantt Chart) module. Using the EGC module the user can modify manually the different constraints applied to the problem as well as perform sequence and assignment changes. Every change modifies the associated EON that is automatically recalculated and the results of the changes are shown in the EGC.

Reported by

Univ. Politecnica de Catalunya, Chem. Eng. Dept.
Av. Diagonal 647, G2
08028 Barcelona
Spain
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